recherche du boson de higgs du modele standard dans le ... · recherche du boson de higgs du modele...

163
Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d´ etecteur D0 aupr` es du TeVatron ` a Fermilab. Betty Calpas To cite this version: Betty Calpas. Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d´ etecteur D0 aupr` es du TeVatron `a Fermilab.. Physique des Hautes Energies - Exp´ erience [hep-ex]. Universit´ e de la M´ editerran´ ee - Aix-Marseille II, 2010. Fran¸cais. <tel- 00522168> HAL Id: tel-00522168 https://tel.archives-ouvertes.fr/tel-00522168 Submitted on 30 Sep 2010 HAL is a multi-disciplinary open access archive for the deposit and dissemination of sci- entific research documents, whether they are pub- lished or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L’archive ouverte pluridisciplinaire HAL, est destin´ ee au d´ epˆ ot et ` a la diffusion de documents scientifiques de niveau recherche, publi´ es ou non, ´ emanant des ´ etablissements d’enseignement et de recherche fran¸cais ou ´ etrangers, des laboratoires publics ou priv´ es.

Upload: others

Post on 25-Mar-2020

4 views

Category:

Documents


0 download

TRANSCRIPT

Page 1: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

Recherche du boson de Higgs du modele standard dans

le canal de ppbarZH -> e+e-bbar, avec le detecteur D0

aupres du TeVatron a Fermilab.

Betty Calpas

To cite this version:

Betty Calpas. Recherche du boson de Higgs du modele standard dans le canal de ppbarZH ->e+e-bbar, avec le detecteur D0 aupres du TeVatron a Fermilab.. Physique des Hautes Energies- Experience [hep-ex]. Universite de la Mediterranee - Aix-Marseille II, 2010. Francais. <tel-00522168>

HAL Id: tel-00522168

https://tel.archives-ouvertes.fr/tel-00522168

Submitted on 30 Sep 2010

HAL is a multi-disciplinary open accessarchive for the deposit and dissemination of sci-entific research documents, whether they are pub-lished or not. The documents may come fromteaching and research institutions in France orabroad, or from public or private research centers.

L’archive ouverte pluridisciplinaire HAL, estdestinee au depot et a la diffusion de documentsscientifiques de niveau recherche, publies ou non,emanant des etablissements d’enseignement et derecherche francais ou etrangers, des laboratoirespublics ou prives.

Page 2: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

�������������� ��� ��� ��

���������������! #" $�� %'& ()"�$*�! #�+�,�-&���"�� &,��.,/0()&-�1�2�3��%'%'� �4�54687�9;:=<?>*@BADCECF7HGIAKJ;7�ALCM@BA�:�9BNMGIJ2O

PRQ�SUTRV�WYX�ZFW�[FW : Z�\^]_X�`PRSba�c�c NM6BdeC�AfGI:�:gA�7 Wh[FWjiMk�l

<?m;ADC�A*@BA-@on7H<8nd?6f<

p!qsr�tjuwv�xyu{zIr |~}K�=�R�juw�Y���U�jzKp�tju��j�~t������=��x�vU�#v�zwu��j�����j�szwu��0� |�}K�=���juw�Y�s���=���B}�v���z�u�tj�=x����U�jz��B�jzw���q�v��jzwu�tj�=x����

�����Y� WYXb� � W � T �

����� ��¡ ¢¤£¥h¦�£�§

WYX�V4Z�W�[~¨ª©!«4�WYX�] �2¬ Wo­ � T�[FW[FW[F©=®h��WYZ � [FW ¬ ¨ 9 XF]_V�W ��� ]_� � [FW ¬ T N � [F]_��W ��� T�X � W

¯°�?±f²+��³�±f²3�µ´�¶ ·¹¸�§ ¸�º ´3�¼»¾½j¿�¿�§À´+¶ Á ¸^´3Â2¥j�ç��g£�º�´+£o³Ä´´+£�º+§Å¥h�Ʊ�£�º+£¥

ZH → e+e−bb£8Ç��?±È¥h�Æ´+É����?±D���?¶3³ËʵÌ

£�¶+¦3³ÍÂ?§Î´+¶ Ï���ÇB£� ³Í¸�ºÑÐ

� ©!Z���WYX�ZFW ¬ WUP!PHÒÓZF]_XEaÔk�PRk'[FWjV�TÔX�� ¬ WLÒÓZ � `Õ®h©!\ � © �Ó� [FW

N�Ö × W � XsT � [ G ¬�¬ W A i�T�\Ø]�XFTÔ�WhZ �N�Ö A � ]�®ÙT�ÒÛÚwT �ÓÜ ÝK�Ó�Y� ]�[FWhX��8[FZ'ÒÓZ � `N�Ö A ¬ WY\ �Y� J T�­�` @ ] � WY®h��WYZ � [FWo��ÞFß � WN�Ö à �h� T � [ C T�ÒÓ©�� d T ��� © � �WhZ �N \ØW ÖµG � T�«áW ¬_¬ WBâ�]�X�­!W � �W �Iã C WhW Ü d T ��� ©���WYZ �N�Ö < T�ä0T�Þ�] � © O T � ZF[sT A i�T�\Ø]�XFTÔ�WhZ �

Page 3: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

å æèç¾é�ê ëÈê�ì í æïîMð�ñ,òMê-ì

d Wh\^W � ®Y]_WY\ØWYXb� � Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö óG X�� � ©=[FZF®j�]�©�X ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö ô

� ��õFög÷�øEù�ú�û�ü�÷Ôýwþ�ÿ�ø �P Ö P : W N ©4[Fß ¬ W C �T�XF[sT � [ Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö l

P Ö P Ö P : W ��� ZsT � ä � Wj� ¬ W �2¬ W � ��©!X � Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö lP Ö P Ö a : W � ]_X���W � T�®h��]�©!X � Ú ©!XF[sT�\ØWYXb�T ¬ W � Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö P!P

P Ö a < Þ � © � ]�W �h¬ WY®j� � ©�ÚwT�]�« ¬ W;Wj�8\ � ® T�XF] � \ØWo[FW m ]_­!­ � ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö P�aP Ö a Ö P < Þ � © � ]�W �Y¬ WY®h� � ©�ÚwTÔ]�« ¬ W Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö P�aP Ö a Ö a N � ® TÔXF] � \^W[FW m ]_­!­ � Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö P�a

P Ö a Ö a Ö P : W®�ÞsT�\ � [FW m ]_­!­ � Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö P�aP Ö a Ö a Ö a : W«á© � ©!X+[FW m ]_­!­ � Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö P ó

P Ö S : T � WY®�ÞFW � ®�ÞFW�[FZ m ]�­�­ � T�Z < WjVÔTÔ� � ©!X Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö P ôP Ö S Ö P 7 ©�X�� � T�]_Xb�W � ��Þ � © � ] � ZFW � Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö P ôP Ö S Ö a 7 ©�X�� � T�]_Xb�W � W�i �á�Y� ]�\ØWYXb��T ¬ W � [F] � Wh®h�W � Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö P ôP Ö S Ö S 7 ©�X�� � T�]_Xb�W � W�i �á�Y� ]�\ØWYXb��T ¬ W � ]_XF[F] � WY®j�W � ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö PRcP Ö S Ö�� Ýf� ©4[FZ�®h�]_©!X+Wh�8[ �h� ]�Xb� � ­ � TÔ�]_©!X+[FZ m ]�­!­ � T�Z < WjV�T0� � ©�X Ö�Ö�Ö�Ö�Ö�Ö a�kP Ö S Ö ó : T � Wh®�ÞFW � ®�ÞFW�[�Z m ]�­!­ � [FT�X �?¬ Wo®YT�XsT ¬ ZH → e+e−bb

Ö�Ö�Ö�Ö�Ö�Ö a�kP Ö�� 7 ©!XF® ¬ Z � ]�©!X Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö a�k

� ��ý���fü� ý{ù�ý���ø� ��fû�÷Ôý�� ø���ùRõ�� ���a Ö P : W�®h©!\ �F¬ W�i�Wo[~¨ T�®h® �h¬��Y� TÔ�]_©!X+[FW 5 W � \Ø] ¬ T�« Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö a �

a Ö P Ö P Ýf� ©4[FZ�®h�]_©!X+[FW �8�F� ©��©!X � Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö a�Qa Ö P Ö a Ýf� ©4[FZ�®h�]_©!X+[FW � T�Xb�] �F� ©Ô�©!X � Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö a�Qa Ö P Ö S : W < WhVÔTÔ� � ©!X Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö a ô

a Ö a : W�[ � �Wh®h��WYZ � @�� Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö S!ka Ö a Ö P : T Ü ©�XFW�[�W � ®Y© ¬_¬ ] � ]�©�X � Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö S!ka Ö a Ö a : T ¬ Z�\^]_XF© � ]�� � Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö Sba

a Ö a Ö a Ö P 7 T ¬ ®YZ ¬ [FW ¬ T ¬ Z�\^]_XF© � ]�� � Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö Sbaa Ö a Ö a Ö a N W � Z � W�[FW ¬ T ¬ ZF\Ø]�X�© � ]�� � Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö Sbaa Ö a Ö a Ö S : W �8�á�Y� ]�©=[FW � [FW �F� ] � Wo[FW[F©!XFX � W � Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö S!S

a Ö a Ö S : W �e� ©!Z �Ûã [ � ��WY®j�WYZ ��� ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö S �a Ö a Ö S Ö P : W[ � �WY®j�WhZ � [�W� � T�®hW � Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö S �a Ö a Ö S Ö a : W � [ � �Wh®h��WYZ �Ó� [FW � ]_WY[ � [FW­!W � «áW � Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�� ka Ö a Ö S Ö S : W® T ¬ © � ]�\Øßh� � W Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�� Pa Ö a Ö S Ö�� : W � [ � �Wh®h��WYZ �Ó� [FW\'ZF©�X � Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖËó P

a Ö a Ö�� : W � ` � �ßY\ØW�[FW[ � ® ¬ WYX�®�ÞFWY\ØWYXb� Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖËó Pa

Page 4: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

a Ö a Ö ó d WY®h©!X � � � ZF®j�]_©!XM[�W �8� V!ßhXFWY\ØWYXb� � Wh�2Ú © � \^TÔ�2[FW � [F©�XFX � W � Ö�Ö�Ö�Ö�Ö ó Sa Ö S 7 ©!XF® ¬ Z � ]_©!X Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö ó��

� ���! øbù"�#��ú$%� ýwþ�ÿgø��Øÿ�ùRý&�wý&�hû'� (*)S Ö P : W � � � T�®hW � Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö ó�ôS Ö a : W � V�W � �Wji ��� ]�\^T�] � W;Wj� � WY®h©!XF[sTÔ] � W Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö ó�ôS Ö S : W � ©�«=ÒÓWh� �8�h¬ Wh®h� � ©!\^T�­!X � �] � ZFW � ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö ó cS Ö�� : W � ÒÓWj� � ÞsT�[ � ©!XF] � ZFW � Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö ó lS Ö ó : ¨ � X�W � ­�]�Wo� � T�X � V�W �Ó� W�\^T�X � ZsTÔX���W Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö Q �S Ö Q 7 ©!XF® ¬ Z � ]_©!X Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö Q �

� ��ü�÷�÷�ø'+�ùRýwü�-ö�ø,�.- û'��ø�÷"/�ý ø0� ø�� ÿg÷�û�ø ö�õ��1�2� ø3+!õ��wü�÷0ý&�54�ù ÷0ø 67(��Ö P N � ��ÞF©4[�W�[FW � � � ©�] �2� ®�ÞFT�Xb�] ¬_¬ ©!X � ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö Q ó��Ö a A ®�ÞFT�Xb�] ¬_¬ ©!X � [FW[F©!XFX � W � Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö Q ô��Ö S C �Y¬ WY®h��]�©!X+[FW �e� V!ßhXFWY\ØWYXb� � Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö Q ô

�FÖ S Ö P @ � �W � \Ø]�XsTÔ��]�©!X3[�Z � ] � [FW � �T ¬ Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö Q ô�FÖ S Ö a C �h¬ Wh®h�]_©!X+[FZ � ]�­�XsT ¬ Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö Q ô

��Ö�� @ � ��W � \Ø]�XFTÔ�]_©!X3[FW � ÚwT�®j�WYZ ��� [FW®Y© �Ó� Wh®h�]_©!X Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö ô P��Ö ó 7 ©!XF® ¬ Z � ]_©!X Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö ô P

( ��ø�÷Rù�ý98:+!õ�ùRýwü� ögø,�.-�ý�ö�ø���ù�ý98:+!õ4ù�ýwü� ögø�� û��wø�+�ùR÷�ü�;�Uö�õ��1�<� ø=+!õ��wü�÷0ý&�54�ù ÷0ø )F�ó=Ö P N � ��ÞF©4[�W�> < T�­ØT�X�[ Ýf� ©!«�W@? Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö ô aó=Ö a A ®�ÞFT�Xb�] ¬_¬ ©!X � [FW[F©!XFX � W � Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö ô Só=Ö S C �Y¬ WY®h��]�©!X+[FW �e� V!ßhXFWY\ØWYXb� � Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö ô��ó=Ö�� : W �e� V!ßhXFWY\ØWYXb� �e� ]_\'Z ¬��h� Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö ô�óó=Ö ó : W« � ZF]_�?[�WÚ ©�XF[+\'Z ¬ ��] ÒÓWj� Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö ô�óó=Ö Q G [FWYXb�]BAs® T0�]�©�X�[�W �8�Y¬ Wh®h� � ©!X � Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö ô Q

ó4Ö Q Ö P 7 � ]_�ß � W � [�W �Ó�Y¬ WY®h��]�©!X Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö ô Qó4Ö Q Ö a A:C ® T�®h]_� �Y� [�¨ª]_[FWYXb��]DAs®YTÔ�]_©!X Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö ô�ôó4Ö Q Ö S 7 © �Ó� Wh®h�]_©!X�[FW � W C ®YT�®Y]�� �Y� Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö ô�ô

ó=Ö ô 7 ©!XF® ¬ Z � ]_©!X Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö ô c6 ��ø�÷Rù�ý98:+!õ�ùRýwü� ögø,�.-�ý�ö�ø���ù�ý98:+!õ4ù�ýwü� ögø�� û��wø�+�ùR÷�ü�;�Uö�õ��1�<�.-FE��HG I��

Q Ö P G X�� � ©=[FZF®j�]�©�X ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö c �Q Ö a : W � ©�«=ÒÓWh� � �T�Z � Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö c óQ Ö S A ®�ÞFT�Xb�] ¬_¬ ©!X3[�W�[�©!XFX � W � Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö c�QQ Ö�� C �Y¬ WY®h��]�©!X+[FW �e� V!ßhXFWY\ØWYXb� � Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö c�QQ Ö ó : W �e� V!ßhXFWY\ØWYXb� �e� ]_\'Z ¬��h� Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö c ôQ Ö Q AJC ®YT�®Y]�� �Y� Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö c ô

Q Ö Q Ö P A:C ® T�®h]_� � [�Z�� � T�ÒÓWh®h�©�­ � T � ÞFW Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö c�cQ Ö Q Ö a A:C ® T�®h]_� � [�W � WY®h©!X � � � ZF®j�]_©!XM[�W � ©!«=ÒÓWh� � ��T�Z � Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö c�cQ Ö Q Ö S A:C ® T�®h]_� � [�Z �Ó�Y� WYT�ZE[�W�X�WYZ � ©!XFW � ��TÔZ Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö l�kQ Ö Q Ö�� A:C ® T�®h]_� � ��©���T ¬ W Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö l!a

Q Ö ô × � ZF]��?[FWoÚ ©!XF[�\'Z ¬ �] ÒÓWj� Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö l!aQ Ö c 5 TÔ®h�WhZ ��� [FW®h© ��� WY®h��]�©!X Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö l!aQ Ö l 7 ©!XF® ¬ Z � ]_©!X Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö l�S

S

Page 5: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

) GÕø�+Ôú�ø�÷K+0ú�ø ögÿ � ü*�hü*�*ö�ø,LMý�/7/�Uögõ��;�M�wø3+!õ���õ��ZH → e+e−bb

���ô4Ö P Ýf� ]�X�®Y] � Wo[FW ¬ ¨ªT�XsT ¬ ` � W Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö l óô4Ö a : W � [F©!XFX � W � Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö l!c

ô4Ö a Ö P A ®�ÞsTÔX���] ¬_¬ ©!X � [�W�[�©!XFX � W � Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö l!cô4Ö a Ö a NBZsT ¬ ]_� � [FW � [F©�XFX � W � Wh� ¬ ZF\Ø]�X�© � ]�� � Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö l!cô4Ö a Ö S Ýf�Ó�jã �Ó�Y¬ WY®h��]�©!X+[FW �e� V!ßhXFWY\ØWYXb� � Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö l!l

ô=Ö a Ö S Ö P OKW � ��Wji�[�¨ ]�Xb�W � T�®j�]_©!X �F� ]_XF®Y] � T ¬ Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö l!lô=Ö a Ö S Ö a A ¬ WY®h� � ©!X � ee

Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö P k!kô=Ö a Ö S Ö S A ¬ WY®h� � ©!X � eeicr Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö P k!kô=Ö a Ö S Ö�� × © � ©!X �QP ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö P k�Pô=Ö a Ö S Ö ó R Wj� � Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö P k�P

ô4Ö S : W �?� V�ßYXFWh\^WhX�� �;� ]�\'Z ¬_�Y� Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö P kbaô4Ö S Ö P à � X �Y� T0�]�©�X�[�W �?� V�ßYXFWh\^WhX�� �;� ]�\'Z ¬_�Y� Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö P k!Qô4Ö S Ö a 7 © ��� Wh®h��]�©!X � [FW �?� V!ßhXFWY\ØWYXb� �;� ]_\'Z ¬_�Y� Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö P k!Qô4Ö�� @ � ��W � \^]_XsTÔ�]_©!X3[FZ�« � Z�]_�?[FWoÚ ©!XF[+\'Z ¬ �] ÒÓWh� Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö P k!lô4Ö��FÖ P : W �e� V!ßYX�WY\ØWYXb� � \'Z ¬ �] ÒÓWj� � [FT�X �?¬ ¨ªT�XsT ¬ ` � W ee

Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö P�PRkô4Ö��FÖ a : W �e� V!ßYX�WY\ØWYXb� � \'Z ¬ �] ÒÓWj� � [FT�X �?¬ ¨ªT�XsT ¬ ` � W eeicr Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö P�P!Pô4Ö ó J © � \ T ¬ ] � TÔ�]_©!X [�W � « � Z�]_� � [FWoÚ ©!X�[ Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö P�P!P

ô4Ö Q @ ] � � � ]�«FZ���]�©!X � [FW®Y©!Xb� �TS!¬ W�T VÔT�Xb� � ��] � ZFWj��T�­!W[FW � ÒÓWj� � [FW« Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö P�P ôô4Ö ô A �] � ZFWj��T�­�W�[�W � ÒÓWh� � [�W�« Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö PRa!a

ô4Ö ô4Ö P Ýf� ]�XF®h] � Wo[FWoÚ ©!XF®h��]�©!X�XFWY\ØWYXb�?[FZ�« ã �T�­!­!]_XF­ Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö PRa!aô4Ö ô4Ö a : W« ã ��T�­!­�]�XF­'[FT�X �8¬ ¨ªT�XsT ¬ ` � W ZHÖ�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö PRa�S

ô4Ö ô4Ö S 7 © ��� Wh®h��]�©!X+[FW ¬ ¨ � ��] � ZFWj��T�«F] ¬ ]�� � [�W � ÒÓWh� � ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö PRa óô4Ö c @ ] � � � ]�«FZ���]�©!X � [FW®Y©!Xb� �TS!¬ W�T �F� ß �8� �] � Z�Wh��TÔ­!Wo[FW � ÒÓWh� � [FW« Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö PRa óô4Ö l 6 ÒÓZ � �Wh\^WhX��e®Y]_X � \^TÔ��] � ZFW Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö PRa�l

ô4Ö l Ö P Ýf� ]�XF®h] � W Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö PRa�lô4Ö l Ö a d �Y� Z ¬ �TÔ� � Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö P S!k

ô4Ö P k 6 XsT ¬ ` � W[F] � ® � ]�\Ø]�XsTÔX���W Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö P S�Pô4Ö PRk Ö P 7 ©�X � � � ZF®j�]�©�XM[FW � T � « � W � Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö P S�Pô4Ö PRk Ö aUODT � ] TÔ« ¬ W � Z��] ¬ ] ��� W � Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö P Sbaô4Ö PRk Ö SVODT � ] TÔ« ¬ WB[�] � ® � ]_\^]_XsT�Xb�WQAFXsT ¬ W Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö P S!cô4Ö P�P 7 ©!XF® ¬ Z � ]�©!X Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö P S!c

I WLý��Ñý{ùRø��X� ÿ�÷Y�wõZ�Yø�+�ù�ý ü�,ø�[\+!õ�+!ø¹ögø3�Í÷�ü ögÿ;+�ùRýwü��ögÿ � ü�Yü��ögø3LEý�//� ���Í�c Ö P : T � ��TÔ��] � �] � ZFW[FWo��W � � Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö P � Pc Ö P Ö P : TU\ � �Þ�©4[FW CLs

Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö P � Pc Ö P Ö a : WXF]�V!W TÔZM[FW®h©!X]A�T�X�®YW

CLs

Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö P �^�c Ö a : W � W �Ó� WYZ ���8� ` � � � \^TÔ�] � Z�W � ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö P �^�

c Ö a Ö P A �Ó� WYZ ���8� ` � � � \^TÔ�] � Z�W � [sT�X �?¬ ¨ªT�XsT ¬ ` � W ZHÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö P �^�

c Ö a Ö a < � TÔ]_�Wh\^WhXb�?[FW � W �Ó� WYZ ���?� ` � � � \^TÔ�] � ZFW � ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö P � lc Ö S 7 T ¬ ®hZ ¬ [FW ¬ T ¬ ]�\Ø]_��W Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö P � lc Ö S Ö P G \ �F¬_� \ØWYXb��TÔ��]�©!X3[�W ¬ T ¬ ]_\^]��W Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö P � lc Ö S Ö a : ]_\^]��W;©�«��WhX=Z�W Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö P � l

c Ö�� 7 ©!XF® ¬ Z � ]�©!X Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö P ó kd �h� ZF\ � Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�ÖÖ�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö�Ö P ó!ó

Page 6: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

_ ê�í ê-ò0` ð�ê�í êba î�ì

R W � WY\ØW � ®h]�WB��©!Z �?¬ W � \^Wh\'« � W � [FZM­ � ©!Z � W @�� [�Z 7 ÝKÝ N [FW N T ��� Wh] ¬_¬ W ÖR W � WY\ØW � ®h]�W?\Ø©!X^[�] � Wh®h��WYZ � [FW?�ÞFß � W A ¬ WY\ �Y� J T�­Ô` � Z�]á\�¨ªT � ©!Z��WhX�Z � ©�Z � ©!«��WhXF] � ®YWj����W�ÞFß � Wdc Wj�«F]�WhX#WYXF®YT�[ ��� [FZ � T�Xb��®YW � � � ©!] � T�XFX � W � Ö�A ��T�Xb� � T3[FW � XF]_ß � W � �ZF[�] T�Xb�WKc ] ¬ T � Z\^W'ÚwT�] � W �F� ©dAF��W � [FW � ©!X Wji �á�Y� ]�WYX�®YWØWh��[FW � T ��� [sT�­!©�­!]�W T�® � ZF] � W � [FZ � TÔX�� � T�®YT ��� ]�ß � W ÖG ¬ \M¨ªT'®Y©�X � Wh] ¬�¬_� Wj�?© � ]_WYXb� � T V!Wh® � ©!Z �2� WYZ ¬ ©!«=ÒÓWh®h�]�Ú.c0ÒÓWo®Y]��We> ] ¬ ÚwT�Z�� � ZFWo�Z �Ó� Z �Ó� ] �Ó� W � �T�ÞFß � Wf? ÖR W � WY\ØW � ®h]�W N T � ]�W ã 7 ¬ TÔZF[FW 7 ©!Z � ]�XF©!Z � ZF]e\�¨ªT � ­bT ¬ WY\ØWYXb� � ©!Z���WYX�ZFWE[�Z � T�Xb�^®YW � � � ©!] �T�XFX � W � c4Wh��TRV�WY® � ZF]!Òh¨ªT�]�WhZ ¬ T®�ÞsT�X�®YWB[FWe� � T VÔT�] ¬�¬ W � ÖgR ¨ªT�]áT �F����� ®h] �e¬ T�\ � ��ÞF©=[F© ¬ ©�­!]�W2Wj� ¬ T� ]�­�ZFWYZ �h� Z�¨ W ¬_¬ WoWh\ �F¬ ©!]�We[sT�X �8� ©�X+� � T VÔT�] ¬ ÖR W � WY\ØW � ®h]�W A � ]_®eÙT�ÒÛÚwT ��Ü c�TÔ®h�Z�W ¬�¬ WY\ØWYXb� ¬ W?[F] � WY®j�WhZ � [FWeX�©�� � W ¬ T�«�© � TÔ��©!] � W Ö0G ¬ \�¨ªT � XF© �Ûã\ � \^WhX�� � ©!Z4�WYX�Z � ©!Z � ©!«4�WYX�] � Z�XFW'«á©!Z ��� W'[FW���ÞFß � W Ö%R W � ZF] � ]�\ �F� W ��� ]�©!XFX � [FZ � � T VÔT�] ¬� Z~¨ª] ¬ T T�®Y®h©!\ ��¬ ]�[sT�X � @�� Wh�;[FW � ©!X � T � ®Y©!Z �Ó� ÖiR ¨ T �F�F��� ®Y]_W � ©�X Þ�ZF\^] ¬ ]�� � Wh� � T � `4\ � T ã�ÞF]_W ÖR W � WY\ØW � ®h]�W C \^TKj X�ÙoW � \^]_®�ÞFW�T V�WY® � ZF]FÒh¨ªT�] � T � ��T�­ � \Ø©!XM«�Z � WYT�Z Ö~7 ¨ªW � �BZ�XFW � W �Ó� ©!X�XFW� � ß � T�­ �Ó� T�« ¬ W Ö]R ¨ªT�]�T�]_\ �8� T'[4`4XFT�\^] � ZFWoT�ZÕ� � T VÔT�] ¬ cb] ¬ W � �?© � [F©!X�X � c4W C ® T�®hWdcFWj���©�Z0ÒÓ©!Z �Ó�[F] �Ó� ©!X�]�« ¬ W � ©�Z � T�]�[�W � ÖR W � Wh\^W � ®Y]_W 6 � XsT�Z�[ @ Z � W ��� ]�X � ©!Z � ®hW � \ØW �Ó� T�­!W � [�¨ WYXF®h©!Z � T�­!WY\ØWYXb�+Wj�3[FW � ©!Z��]_WYX Ö7 ¨ªW � �UZFX�W � W ��� ©!XFXFWÕ©�Z�V!W � �WKc�\Ø©��]�V � WdcgWh� � ZF]DX�¨ Þ �Y� ]_��W � T �lk \^Wj��� � W WhX �F� TÔ�] � Z�W � W �XF©!\'« � WYZ � W � ]�[ � W � ÖáC TU[�`=XsT�\Ø] � ZFW � W � �8[FW\^©Ô�WYZ � T�Z+­ � ©!Z � W ÖR W � Wh\^W � ®h]�W C �WjV!W N ZFT�X Ü T � ©!Z ��� W � WhXF®Y©�Z � T�­�WY\ØWYXb� � Öf7 ¨ W � �'ZFXFW � W �Ó� ©!X�XFW^� � ß ��� ©!Z ã� ] TÔX���W�Wj�®�ÞsT ¬ WhZ � WhZ � W Ö%R ¨ªT�]ÄT ���F��� ®Y] ��� W ��Ó�Y� ©!X � W �mk \^W � [F]Bn �h� WYXb��W ��� ZFW � �]_©!X � c~Wh�oXF© �[F] � ®YZ �Ó� ]�©�X � ÖR W � Wh\^W � ®h]�W @ TRV=]_[ R T�\Ø]�X � ©!Z ��� ©�X � ©!Z4�]�WhX Ö�7 ¨ªW � �fZFX�W � W ��� ©!XFXFW � Z �:� ZF]=©!X � WYZ4�Ä®Y©�\ �4ã�W � ÖR ¨ TÔ] T �F�F�Ó� ®h] � XF© � [F] � ®YZ ��� ]_©!X � cs] ¬ W � � � Wh\ �F¬ ]~[�¨ Þ�ZF\Ø©!Z � Wh�8W � �?� � ß � T�­ ��� T�« ¬ W ÖR W � WY\ØW � ®h]�W � ­bT ¬ WY\ØWYXb�D[FW � T�XF®h]�WYX � \ØWY\'« � W � [FZÕ­ � ©!Z � Wdc 6 XFXFW ã 5 ¬ WhZ � × T � Ú Z ��� c C TÔ\'ZFW ¬7 T ¬ V�Wh�8Wh� 6 Z ���h¬ ]�WhX N WYXF[�ß �;� ©!Z �2¬ WYZ �Ó� T�]�[�W �?�F��� ®Y]_WYZ � W � ÖR W � Wh\^W � ®h]�W ¬ W � \^Wh\'« � W � [FWE­ � ©!Z � WM[FW @�� k 5 W � \Ø] ¬ TÔ«!c�ÒÓW � WYX � W WYX � T � ��]�®YZ ¬ ]�W �Mk\^W � ®h© ¬�¬ ßY­!Z�W � | @�Öá× T�XF[�Z � ]_X!c�o Ö�× Zic�Ù Öá7 ÞsTÔX!c C�Öá@ W � T�]pc C�Öá5 Z!cFâ Öáà WY] � �qc N Ö Ùo] � «b`^cR�Ö Ù � T�Z � c N�ÖáN Z ¬ ÞFW T � X!c A2ÖáC � � T�Z �Ó� Wh� <oÖ�O T � Z�[sT ÖR W � Wh\^W � ®Y]_W ¬ W � \ØWY\'« � W � [FZ^ÒÓZ � ` � ©!Z �;¬ W��Wh\ ���Q� Z�¨ ] ¬�� \M¨ ©!Xb�oT�®h®Y© � [ � c�Wh� � ©!Z � TRV�©!] �T�®Y®hW � � � [FW2ÒÓZF­!W � \Ø©!X�� � T VÔT�] ¬ Ö7R W � WY\ØW � ®Y]�W A � ]_®�ÙT�ÒÛÚwT ��Ü�� ©!Z � T V!©�] � T�®Y®hW � � � [FW �F���h� ] ã[FW � Ö�R W � WY\ØW � ®h]�W � T � �]_®YZ ¬ ]�ß � WY\ØWYXb� < T�ä0T�ÞF] � © O T � Z�[sT � ZF]s\�¨ TWYX�® T�[ �Ó� [�Z � T�Xb� �F¬ Z � ]_WYZ �Ó�\^©!] � c Òh¨ TÔ]~«áW T�ZF®h©!Z � T �F�F�Ó� ®h] � � � T VÔT�] ¬_¬ W � T V!Wh® ¬ ZF]pc=] ¬ W � �?]�X]AsX�]�\ØWYXb� � TÔ��]�WhX���Wh�?­!WhX���] ¬ c4Wj�] ¬ W � � � ­bT ¬ WY\ØWYXb�H� � ß � W C ® T�®hWo[sT�X �2� ©!X3� � T VÔT�] ¬ Ö'R W � Wh\^W � ®h]�WB\ØW � [�WYZ4i � T �F� © � �WYZ ��� | −G � T�«áW ¬_¬ WUâ�]�XF­�W � ��W �Iã C WhW Ü � ©!Z ��� ©�X � ©�Z��]_WYX Ö;R ¨ªT�]HT �F�F��� ®Y] � ®hW � X�©!\'« � WYZ � W �'� WY\^T �T� ZFW �Wh� � Z�W � ��]�©!X �Q� ZF] � � \^©!]_­!XFWhX��8[FW � ©!XMWYXF­!T�­!WY\ØWYXb� ÖiR W ¬ ¨ªT�]�T�Z ��� ]�� � ©!Z�V � � �Ó�Y�8� ]_­!©!Z � WYZ � WWh� � W ���Ó� ]�®YT�®YW Ö − à �Y� T � [ C TRÒÓ©�� � ©!Z �o� ©�X � ©!Z���]�WYX Ö�7 ¨ªW � ��ZFXFW � W �Ó� ©!X�XFWU� � ß �o� ©!Z � ] TÔX���WWh�Ø­!WYXb��] ¬�¬ WdcÍ®YW � ZF]?\M¨ªT � W � \Ø] � [�¨ � ® � ] � W+®YW+\^T�X�Z � ® � ]_�^T V!Wh®MZ�X � WYZ \^©�]�X � [�W � � � W ��� ÖR W � Wh\^W � ®h]�W × W � XsT � [ G ¬�¬ W � ©!Z ��� ¨�rh� � W [ �Y�F¬ T�® � Ö�A X]AsXMÒÓW � Wh\^W � ®h]�W A ¬ WY\ �Y� J T�­Ô` � ©!Z �\M¨ªT V!©!] � ®Y©!X � �]��Z � ®hW�ÒÓZ � ` ÖR W � WY\ØW � ®Y]�WB��©!Z���W�\^T�ÚwT�\Ø] ¬_¬ W ��� ©=®�ÞFWWh�8\^©�]�X ����� ©=®�ÞFW � ©!Z �2¬ WYZ �2� ©!Z���]�WYX ÖR W � WY\ØW � ®Y]�W

ó

Page 7: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

\ T+\Øß � W d ©!«áW � � R ©!XsT � A Z � Þ � T � ]�W � ©!Z � \�¨ T V�©!] �� ©�Z��WhX=Z [�Z � T�Xb���©!Z4�W � ®YW � T�XFX � W � ÖN T�\^T�X � T�[F]�WhZ � WKcfT�]_\ T�Xb��Wdc�[ � V!©�Z � W Ö�Ö_Ö c ¬ W � \Ø©�� � \ØWÕ\^T�X � ZFWhX�� � ©!Z �U¬ TE[ � ® � ] � W ÖsR W� Wh\^W � ®Y]_Wo\^©�X � ß � W � ©�Z �?� ©!X � ©!Z4�]�WhX Ö

Q

Page 8: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

t a î�òvuÀëxwx`�îMð!uUa

: W'\Ø©=[Fß ¬ W � �T�XF[sT � [¹[FW ¬ T � Þb` � ] � ZFWU[�W �o� T � �]_®YZ ¬ W � c �Y¬ T�«á© ��� TÔZ [ � «�Z��[FW � TÔXFX � W �ô k]csW � �8ZFX � ZF®Y®hß � [�W � ZF] � [�W�X�©!\'« � WYZ � W � TÔXFX � W �Qk ¬ ¨ Wji4®hW � ��]�©!X�[FZE«á© � ©!XM[�W m ]�­!­ �e� ZF]X�¨ T � T � WYXF®h© � W � � � [ � ®Y©!Z�V�W � � Ö�7 ©!\^\ØW ¬ W?\^©=[Fß ¬ W � �T�XF[sT � [ XFW8[F©!X�XFWBT�Z�®YZFXFW �F��� ®Y] � ]�©�X� Z �Ä� To\ T �Ó� WKc ¬ WH«�© � ©!XU[FW m ]�­!­ � W � � ¬ ¨ ©!«=ÒÓWh��[FW � Wh®�ÞFW � ®�ÞFW8[FWH�©�Z��W2ZFX�W�­ � X �Y� T0�]�©�XU[�¨ªW�i ã���h� ]�WhXF®YW � [FW � Þb` � ] � ZFW^[FW � ÞsT�Z4�W ��� X�W � ­�]�W � c Wh��®�¨ W � � � ­bT ¬ WY\ØWYXb� ¬ W � Z0ÒÓWh��[FW � Wh®�ÞFW � ®�ÞFW[FWB®YWj����W;�ÞFß � W Ös@ W � �Þ � © � ]_W � T�]_X � ] � ZFWB[FW � Wji �á�Y� ]_WYXF®hW � [F] � Wh®h� � ©!Z3]�X�[F] � WY®h� � c�ÚwT V!© � ] � WhXb�ZFX m ]�­!­ � [FW8«sT ��� W?\ T �Ó� WKcb®�¨ W � � ã.k0ã [F] � W2]�X�Ú �h� ]_WYZ � W k PRS óoà WyO Öb6 Z4i «FT ��� W � \^T �Ó� W � c � �T�Xb�[F©!XFX ��¬ Wo��TÔZ4iM[FW ��� ©=[FZF®h��]�©!X �Y¬ WhV � [FW � « � Z�]_� � [FW�Ú ©!XF[ � T �e� T �F� © � � k X�©�� � W � ]�­!XsT ¬ c ¬ T� WY®�Þ�W � ®�Þ�W�[FZ m ]�­!­ � T�Z < WjV�T0� � ©�X � WBÚwT�]_�H[sT�X �?¬ W � ®YT�XsT�Z4i3©^z3] ¬ W � � �F� ©4[�ZF]_�HWYXMT ��� ©4®h] T ã�]�©�X+TRV�WY®�ZFX�«�© � ©!X+â ©!Z P Ö6 ZE®h©!Z �Ó� [FW�\ TU�Þ�ß � WKcbÒh¨ªT�] � T � �]_®Y] �á�mk^¬ T � WY®�Þ�W � ®�Þ�WU[FZ m ]�­!­ �?�F� ©4[�ZF]_�8WYXET ��� ©4®h] TÔ��]�©!XTRV�WY®ÕZ�X «á© � ©!X P,� W^[ �Y� ]�Xb� � ­ � TÔX���WYX �h¬ Wh®h� � ©!X �|{w� T�] � W �Y¬ WY®j� � ©�X ã � © � ]�� � ©!X7} Ö�: ¨ªTÔ�©�Z���[�W®YW'®YT�XsT ¬ cáW � � � ZFW ¬ W �e�Y¬ Wh®h� � ©!X �;�F� ©=[FZF] � WYXb�;ZFX � ]_­!XsT ¬ XFWh�BWh�;ÚwTÔ®Y] ¬ W k ]�[FWhX���]DAsW � [sTÔX �B¬ W® T ¬ © � ]_\^ßj� � W Ö�R ¨ªT�] � T � T�] ¬�¬ WYZ �Ó� W~n�WY®j�Z � \^W � � � T VÔT�Z4iU[FW8����®�ÞFW � [FW � W � V=]_®YW �L� Z �K¬ T®h© ��� WY® ã�]�©�X [FW ¬ T \^W � Z � WU[FW ¬ ¨ � XFW � ­!]�W'[FT�X �B¬ W'® T ¬ © � ]_\^ßj� � WdcáT�]�X � ] � Z�W � Z �o¬ ¨ª]_[FWYXb�]BAs® T0�]�©�XM[FW ��Y¬ Wh®h� � ©!X � [sTÔX �?¬ Wo® T ¬ © � ]�\Øßh� � W ÖÝ ©!Z � T�ZF­!\ØWYXb��W �D¬ ¨ W C ® T�®h]_� � [FZ � ]_­!XsT ¬ c ¬ W8® T �L� T � ��]�®hZ ¬ ]_W � ©^z^ZFXÕ[FW �H�Y¬ WY®j� � ©�X �L� We� � ©!Z�V�W[sT�X �K¬ T �Ó� ­!]_©!X ]�Xb�W �Ûã ® � `�© � �TÔ�D[FZØ® T ¬ © � ]_\^ßj� � WHT � ­bT ¬ WY\ØWYXb� � � � TÔXsT ¬ ` �Ó�2���Y� T ��� \^WhX�� Ö4N T®Y©!Xb� � ]�«FZ4�]�©�X+T � � ���F¬ Z � ]�\ � © � ��T�Xb��WB[sT�X � ®hW�[�W � X�]�W � ®YT � Ö: T � Wh®�ÞFW � ®�ÞFWoT � � �8��� T ¬ ] ��� W8[FT�X �H¬ W � [F©!X�X � W � ®Y© ��� W ��� ©!XF[sTÔX�� k ZFX�W ¬ ZF\^]_XF© � ]_� � ]�Xb� � ­ ��� W[FW �FÖ aBÚ « −1 c!®Y© ¬�¬ Wh®h� � W � WhXb� � W8T V � ] ¬ a�k!kba;Wj�K[ � ®hWY\'« � Wea�k!k!coT V�WY® ¬ W2[ � �Wh®h�WhZ � @�� T�Z �F� ß �[FZ < WhVÔTÔ� � ©!X Ö�6 Z�®YZFX W�i�®hß � [~¨ � V!ßYX�WY\ØWYXb� � ®h©!\ � TÔ�]_« ¬ WØT V!Wh® ¬ T �F���h� WhXF®YW3[FZ�«�© � ©!XÑ[�Wm ]�­�­ � X�¨ªT � � � ©!« � W � V � c�®YW � WYX�[sT�Xb� [FW �U¬ ]�\Ø]_��W �� Z �á�Y� ]�WhZ � W �U� Z �'¬ T � Wh®h��]�©!X W C ®YT�®YW3[�W�F� ©=[FZF®j�]�©�X�[�Z�«á© � ©!XM[�W m ]�­!­ � ©!Xb� � � ��� �T�« ¬ ]�W �H� Z � ZFXFW�­bT�\Ø\ØW;[FW�«sT �Ó� W � \^T ��� W � Ö: ¨ © � ­bT�XF] � TÔ��]�©!X�[FW�®hW�\ � \^©�] � W � ¨ © � ]�WYXb��W � ZF]�VÔT�Xb��� � ©!] � ­ � TÔXF[ � T0i4W � | ¬ W �F� WY\Ø]�W �g�F�Ó�Y� WhXb�W¬ W�®YT�[ � W��Þ � © � ] � ZFW'Wj�oWji �á�Y� ]_\^WhXb��T ¬ c�TÔ]�X � ] � ZFW ¬ W � ©!«=ÒÓWh� � Z��] ¬ ] ���Y�8¬ © ��� [FW ¬ ¨ªT�XsT ¬ ` � W:� ¬ W[FWYZ4i4]_ßY\ØW�®h©!XF®YW � XFW ¬ W � [F]Bn �h� WhX�� � � � T VÔT�Z4i�[FW���Ô®�ÞFW � [FW � W � V=]_®YW ��� ZFW?Òh¨ªT�] W~n�WY®j�Z �h�B� Z �¬ W2® T ¬ © � ]�\Øßh� � W:��Wj� ¬ W�� � ©!] � ]�ßh\^W � © � �W � Z �K¬ T � WY®�ÞFW � ®�ÞFWe[FZØ«�© � ©!XØ[FW m ]�­!­ � [sT�X �K¬ W2®YT�XsT ¬ZH → e+e−bb

ÖF6 ]_X � ]&cF®YW\ � \Ø©!] � WoT ¬ T � � � Z�®h�Z � W � ZF]�V�TÔX���W � |

• ¬ W#®�ÞsT � ]_� � W,P W � �EZ�XFW ]_X�� � ©=[FZF®j�]�©�X�TÔZ�\Ø©4[Fß ¬ W � ��T�XF[FT � [�[FW ¬ T � Þ�` � ] � ZFW [�W �� T � �]�®hZ ¬ W � Wh�eT�Z�\ � ® TÔXF] � \^WB[�W m ]�­!­ � �• ¬ W ®�ÞsT � ]_� � WÕa+W � ��ZFX�W^V=ZFW ­ ¬ ©!«sT ¬ WU[FZ�®Y©!\ �F¬ W�i4W^[�¨ªT�®h® �Y¬_�Y� TÔ�]_©!X�[�Z < WhVÔTÔ� � ©!X Wj�[FZ�[ � ��WY®h��WYZ � @�� k 5 W � \^] ¬ T�«��• ¬ W¹®�ÞsT � ]_� � W S W � �MZFXFW#]_X�� � ©=[FZF®j�]�©�X�TÔZ4i�©!«=ÒÓWj� ��� Þb` � ] � ZFW � Z���] ¬ ] ���h� [sT�X � ®hWh����W�ÞFß � W:�• ¬ Wo®�ÞsT � ]_� � W � �F�Ó�Y� WYXb�W ¬ ¨ � �Z�[FW�ÚwTÔ]_�W � Z �8¬ TU®Y© �Ó� Wh®h�]_©!X�[FW ¬ ¨ � XFW � ­!]�W\ØW � Z ��� W�[sTÔX �¬ Wo®YT ¬ © � ]�\Øßh� � W:�• ¬ W2®�ÞsT � ]_� � W ó [ � ® � ]_� ¬ ¨ � ��ZF[FW?[FW ¬ To®hW � ��]DAs®YTÔ�]_©!X [FW �D�Y¬ WY®j� � ©�X � [sT�X �D¬ W2®YT ¬ © � ]�\Øßh� � W:�

ô

Page 9: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

• ¬ W8®�ÞFT � ]_� � W?Q[ � ® � ]�� ¬ ¨ � �Z�[FW?[FW ¬ To®YW � �]BAs® T0�]�©�XØ[�W �K�Y¬ WY®h� � ©!X � [FT�X �D¬ T ��� ­!]�©�XØ]_Xb�W �Iã® � `!© � ��T0�;[FZ�® T ¬ © � ]�\Øßh� � W:�• ¬ W�®�ÞsT � ]_� � W ô [ � ��T�] ¬�¬ W ¬ ¨ªT�XsT ¬ ` � W � Z �M¬ T � Wh®�ÞFW � ®�ÞFWÑ[FZ m ]_­!­ � [sT�X �M¬ W#® TÔXsT ¬ [FW�F� ©4[�ZF®h��]�©!X ZH → e+e−bb

�• ¬ W�®�ÞsT � ]�� � W2c �F���h� WhX���W ¬ W �����Y� Z ¬ �TÔ� � AsXsT�Z4i'[FW � ®YT ¬ ®hZ ¬�� [FW �f¬ ]�\Ø]_��W ��� Z �á�Y� ]�WhZ � W �D� Z �¬ T � WY®h��]�©!XMW C ® TÔ®YW�[�W �F� ©4[�ZF®h��]�©!X�[FZE«á© � ©!XE[FW m ]_­!­ �?� Z � ZFX�W�­bTÔ\^\ØWo[FW�«sT ��� W �\^T ��� W � Ö

c

Page 10: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

� � æ��¾ðáî�ò�ê �

� æ¤ëÈòMê î ��� u¤òEð���wÈê

�Z�����]�����]��'��� �1�M�����*�d�D�v���@ g¡�i �¢~�����£�£���£�Q�£���£�£���£�Q���£�£���£�£�Q��� ¤

¥§¦¨¥§¦¨¥ ©7ª�«s¬K­�®¯±°d«�ª�²s³Fª�«J³Fª�´�².µq¶g«M¦e¦h¦·¦h¦·¦h¦·¦·¦h¦e¦h¦·¦·¦h¦·¦h¦·¦h¦ ¸¥§¦¨¥§¦º¹ ©7ª�«J»¨¶K².ª�¯¼®q½�²±»Fµq¶g«s¾9µq¶g¿g®Àmª�¶�²¼®³Fª�«Á¦·¦h¦·¦·¦h¦e¦h¦·¦·¦h¦·¦h¦·¦h¦ ¥§¥

�'�B Ã�ÄÅK��¢qÆD�<ÅK�Ç��È"�@¢~�'É� gÆÇÊi�Ç�<�"�HËvÅ�È" g¡iÆÇÌfËÍ�#�i�<ÎMÆDÏ'Ï�Ì��£���£�£�Q���Ð��Â¥§¦º¹^¦¨¥ Ñ:ÒgÓ�µq¯±»Fª·Ó�³Fª�½�²±¯.µ¾�®»¨Ô�³FªÕ¦h¦·¦e¦h¦·¦h¦·¦h¦·¦·¦h¦e¦h¦·¦·¦h¦·¦h¦·¦h¦ ¥@¹¥§¦º¹^¦º¹ Ö<Ó�½@®¶�»F«.Àmª·¿�ªh×�»¨Ø§Ø"«U¦h¦·¦e¦h¦·¦h¦·¦h¦·¦·¦h¦e¦h¦·¦·¦h¦·¦h¦·¦h¦ ¥@¹

�'�FÙ �1 Y¢~�KÈÄ*��¢ÈÄ*�M�!ÚZÎMÆDÏ'Ï�Ìm gÚÛÃ;�"Ü� ^�@¢~�]¡b�£���£�Q���£�£���£�£�Q���Ð��Ý¥§¦ºÞ^¦¨¥ ßàµq¶�²±¯¼®»¨¶K².ª�«�²±ÒgÓ�µq¯±»F¬K­gª�«Z¦·¦e¦h¦·¦h¦·¦h¦·¦·¦h¦e¦h¦·¦·¦h¦·¦h¦·¦h¦ ¥fᥧ¦ºÞ^¦º¹ ßàµq¶�²±¯¼®»¨¶K².ª�«âªTã^´]Ó�¯±»¨Àmª�¶K²¼®³Fª�«â¿^»¨¯.ª�½�².ª�«Q¦·¦·¦h¦e¦h¦·¦·¦h¦·¦h¦·¦h¦ ¥fᥧ¦ºÞ^¦ºÞ ßàµq¶�²±¯¼®»¨¶K².ª�«âªTã^´]Ó�¯±»¨Àmª�¶K²¼®³Fª�«�»¨¶g¿^»¨¯.ª�½�².ª�«ä¦·¦h¦e¦h¦·¦·¦h¦·¦h¦·¦h¦ ¥@奧¦ºÞ^¦ æ ç�¯.µd¿^­g½�²±»Fµq¶<ª�²s¿�Ó�«±»¨¶K².Ó�ا¯¼®²±»Fµq¶2¿^­#×⻨اØ"«�®­MÑ*ª�èq®²±¯.µq¶é¦h¦·¦h¦ ¹§ê¥§¦ºÞ^¦ºë ©®£¯.ª�½¼Ògª�¯.½.Ògªe¿^­<×�»¨Ø§Ø"«s¿g®¶g«s³Fª·½@®¶�®³

ZH → e+e−bb¦h¦·¦h¦ ¹§ê

�'�¨ì íe�]¡È���Ú*ÌfÆÇ�'¡<���£�£���Q�£���£�£���£�Q�£���£�£���£�Q���£�£���£�£�Q���îÂ�ï

7 W®�ÞsT � ]_� � W � © � W ¬ Wo®YT�[ � W��Þ � © � ] � ZFWo[�Z � Z0ÒÓWh�8[FWo�Þ�ß � W � �ZF[F] � Ö�@ ¨ªT�«á© � [ ¬ W N ©4[�ß ¬ WC ��T�X�[sT � [*[�W ¬ T � Þb` � ] � ZFW#[FW �3� T � �]_®YZ ¬ W � W � �+[ � ® � ]_�qc � ZF]�V=]_�Õ[~¨ªZFX�W ]_Xb� � ©=[FZF®j�]_©!X kѬ T�Þ � © � ]_W �Y¬ WY®h� � ©�ÚwTÔ]�« ¬ W�Wh��T�Z#\ � ®YT�XF] � \^W�[FW m ]_­!­ � c~WYX]AsXic ¬ T � Þ � XF©!\ � XF© ¬ ©!­!]_W�[FZ m ]�­!­ �T�Z < WjV�T0� � ©�XMW � �eT�«á© � [ � W[sT�X �?¬ T'[�W � X�]�ß � W � T � ��]�W Ö

ð Ð ð ñ �Áò ¸Ø´+Â2¥j� ó �g£�º+´�£o³�´: W N ©=[Fß ¬ W C �T�XF[sT � [ { XF©Ô� � CFN c � ©!Z � C ��T�X�[sT � [ N ©4[FW ¬ WYX�T�X�­ ¬ T�] � }K[FW ¬ T � Þb` � ] � ZFW[FW �e� T � ��]�®hZ ¬ W � W � �oZFX�W��Þ � © � ]�W � Z�]�[ � ® � ]�� ¬ W � ®Y©!X � �]��ZsT�Xb� �;�Y¬_� \ØWYXb��TÔ] � W � [�W ¬ TØ\ T0�]�ß � WWh� ¬ WhZ ��� ]_X���W � T�®h��]�©!X � Ö?7 ¨ W � �MZFXFW¹��Þ � © � ]�W � ZsT�Xb��] � ZFW � W ¬ TÔ��]_V=] � �W «sT ��� W � Z ��¬ W¹­ � ©�Z � W[FW � `=\ � � � ]_W SU(3)couleur × SU(2)L × U(1)Y

Ö;C T,®Y©�XF®YW � �]_©!X�Z���] ¬ ] � W ¬ W#Ú © � \^T ¬ ] � \ØW¬ T�­ � T�XF­!]_WYXÕWj� ¬ W � ��Þ � © � ]�W � [FWHÒ�T�ZF­!W#ô Põ�ôªa�õ Öö�÷¼ös÷øö % ���\ùûúQüJý]þh�ÿ�i���.�����.�����'�s�Q�: W ��� T � �]_®YZ ¬ W �o�h¬�� \ØWYXb�T�] � W � [FW \ T0�]�ß � WU[FZ CFN � ©!Xb� � Z �F� © �Ó� W ��� ©�XF®h��ZFW ¬_¬ W � c W ¬_¬ W �©!Xb�LZ�X �Ó� ]�X [FWh\^] ã WYXb��]�W � c�®hW � ©!Xb�L[�©!XF®?[FW � Ú W � \^]_©!X � Wj� � T � ®Y©�X ���~� Z�WYXb��W ¬�¬ W �f� W ��� WY®h��WYXb�

l

Page 11: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

Ýf� WY\Ø]�ß � W @ WYZ4i4]�ßh\^W < � ©!] � ]�ßh\^W 7 ÞsT � ­!W J ©!\'« � W J ©!\'« � WÚwT�\^] ¬�¬ W { \ T �Ó� Wq} ÚwT�\Ø] ¬�¬ W { \ T ��� Wq} ÚwT�\Ø] ¬_¬ W { \^T ��� W§} �Y¬ WY®h� � ] � Z�W ¬ W � �©�XF] � ZFW «sT � `!©!XF] � ZFWNBZsT � ä � Z { P Ö ó ã S Ö S N WyO�} ® { P Ö a ô à WyO�} � { P ô P Ö a à WyO�} 2/3k

1/3[ { S ã Q N WyO�} �H{ ô k ã PRS!k N WyO�} « { �FÖ a ã ��Ö ôUà WyOm} −1/3k

1/3: W � �©!X � e− { k Ö ó N WyOm} µ− { PRk ó4Ö ôUN WyOm} τ− { P Ö ô!ô!ôUà WyOm} ã P P kνe{�� a WyO�} νµ

{�� k Ö PRl N WyO�} ντ{�� PRc Ö a N WyOm} k P k

��� � P Ö P�� : W � Ú W � \^]_©!X � [FZ CFN Wh� ¬ WhZ ���+�F� © �F� ] � � �Y� Ö?: W � ®�ÞFT � ­!W � Wj� ¬ W � XF©�\'« � W �¬ W � �©!X�] � ZFW � Wj�8«sT � `�©!XF] � Z�W �8� ©!Xb�8© �F� © ���h�?� ©!Z �2¬ W � T�Xb��] ã � T � ��]�®YZ ¬ W � Ö

¬ W ��� ]�X�®Y] � WÕ[�¨ Wji4® ¬ Z � ]�©!X [FW Ý TÔZ ¬ ] � ZF]2[�]_� � ZFW+[FWhZ4i Ú W � \^]_©!X � X�W � WYZ4V!WYXb�^©4®h®YZ � W � ¬ W\<rh\^W � ��T0� � ZsTÔX���] � ZFW Ö: W � Ú W � \Ø]�©!X �^� ©!Xb� � ­bT ¬ WY\ØWYXb� �Ó�Y� T � �] � WYX�[FWhZ4i*­ � ©!Z � W � c ¬ W � ¬ W � ��©!X � Wj� ¬ W �|� ZsT � ä � c� WhX � ]_« ¬ W �äk [�]Dn �Y� WhXb�W � ]�Xb�W � T�®j�]�©�X � c � Z�]_VÔT�Xb�L� � ©!] � ­ � X �h� TÔ��]�©!X �Q{ ©�Z ÚwT�\Ø] ¬�¬ W � } � ZF]�X�WB[F]_Ú ãÚ ß � WYXb� � ZFW � T ��¬ ¨ � ®�ÞFW ¬_¬ WØ[FW \^T ��� Wdc�V!©!] � �T�« ¬ W T�Z,P Ö P Ö�: W �H� ZsT � ä � ZicÍ[!cÍWh� ¬ W ��¬ W � �©�X ��Y¬ WY®h� � ©!X { e− }?Wj�;XFWhZ�� � ]�XF© �Y¬ WY®j� � ©�XF] � ZFW { νe

}@cáT �F� T � �]_WYXFXFWhXb� k ¬ T �F� Wh\^]_ß � W�­ � X �h� TÔ��]�©!X Ö: W �e� ZFT � ä � ®dc � c�Wh� ¬ W �?¬ W � �©!X � \'ZF©�X { µ− }2Wh�8XFWhZ�� � ]�XF©Ø\'ZF©!X�] � ZFW { νµ}@c�Ú ©�X�� � T � �]_W[FW

¬ TÕ[FWhZ4i4]�ßh\^W ­ � X �Y� TÔ�]_©!X Ö A X]AsX ¬ T � � ©!] � ]�ßh\^W�­ � X �h� TÔ��]�©!X#®h©!\ � © � �W ¬ W ��� ZsT � ä � �qc «!c Wj�¬ W �L¬ W � ��©!X � �T�Z { τ− }DWj��XFWhZ�� � ]�XF©���T�Z { ντ

} Ö4: W ��� T � �]_®YZ ¬ W � [FW �F� WY\Ø]�ß � We­ � X �h� TÔ��]�©!X � ©!Xb�¬ W �L�F¬ Z �H¬_� ­!ß � W � Wh��W ¬�¬ W �D� ©!Xb� � ��TÔ« ¬ W � c�[�W;®YWeÚwT�]_�DW ¬_¬ W � Ú © � \^WhXb� ¬ T�\ T0�]�ß � W?© � [F]�XsTÔ] � W Ö�: W �� T � �]�®hZ ¬ W � [FW?[FWYZ=i�]_ßY\ØWeWj�K� � ©�] � ]_ßY\ØW�­ � X �Y� TÔ�]_©!X � ©!Xb� �F¬ Z �K¬ ©!Z � [�W � Wh�D]�X � ��TÔ« ¬ W � cbW ¬_¬ W �f� W[ �Y� ]�Xb�ßh­ � WhXb�?[F©!XF® � T � ]�[�WY\ØWYXb�2WYX � T � �]_®YZ ¬ W � [�W �F� Wh\^]_ß � We­ � X �Y� T0�]�©�X!c ¬ W ���F¬ Z �2¬�� ­!ß � W � Ö: W'XFWYZ4� � ]_XF©+T �Ó� ©=®Y] � TÔZ ¬ W � �©!X¹[FWU®�ÞFT � ZFW ­ � X �h� TÔ��]�©!Xic~]�Xb��W � TÔ­!]_�8� � ß �� WhZ#T V!WY® ¬ TÕ\ T ã�]_ß � W Ö�G ¬ T � � � \Ø©!Xb� �Ó�2� ZFW ¬ W � XFWYZ�� � ]_XF© � © � ®Y] ¬�¬ WYXb�qc�®�¨ W � � ã±k0ã [F] � W � Z~¨ª] ¬���� WhZ�V!WhX�� � T ��� W �[�¨ ZFXFWB­ � X �Y� TÔ�]_©!X k ZFXFWoT�Z4� � WKc4Wj� � © ��� ßY[FWhX��?[�©!XF®dc4«F]�WhX � ZFW;� � ß � ÚwT�]�« ¬ WdcbZFX�WB\ T ��� W � ZF]X�¨ªT � T � WYXF®h© � W � � � \ØW � Z ��� W �F��� ®Y] �Ó� \ØWYXb�HôªS�õ ÖÝ ©!Z � ® T � T�®h� �Y� ] � W �ج ¨ � ��TÔ� � ZFT�Xb�] � ZFW�[FW � [�]Dn �Y� WhXb�W � � T � �]_®YZ ¬ W � cÄ©!X ¬ WhZ ��� TÔ�Ó� � ]_«FZFWÕ[�W �XF©!\'« � W � WYXÕÚ ©!X�®h�]_©!XÕ[FW ¬ WYZ �H�F� © �F� ] � � � Ö=6 ]�X � ] ¬ W �H¬ W � �©!X �L� © ��� ßh[FWYXb�?ZFX3X�©!\'« � W ¬ W � �© ãXF] � ZFW { �Y¬ WY®h� � ©!X�] � ZFWdch\'ZF©!X�] � ZFWfWh� �T�ZF©!X�] � ZFW§} � ZF] � W � \ØWh� [FWK[F] � ��]�XF­!Z�W ��¬ W � ­ � X �Y� TÔ�]_©!X � cWh��ZFX�XF©!\'« � W ¬ W � �©!XF] � ZFW ­ ¬ ©!«FT ¬�� ­bT ¬ W k P Ö�: W � XF©!\'« � W �¬ W � ��©!XF] � ZFW ��� ©!Xb��®h©!X � W � V �Y�¬ © �Ó� [FW � ]�Xb�W � T�®j�]_©!X �hk ®h©!Z � TÔX���XFWYZ�� � W { � ÞF©���©!X!cF­ ¬ ZF©!X!c Z0 } ÖF: W �h� ZsT � ä �?� © �Ó� ßh[FWYXb�8ZFXXF©!\'« � W;«FT � `�©!XF] � ZFW � ­bT ¬ W k P��ÔS ÖF7 W;[FW � XF]�W � Wh�2W � ����©!Z0ÒÓ©!Z ��� ®h©!X � W � V �o¬ © �Ó� [FW � ]�Xb�W � T�® ã�]_©!X � WhX�� � W � T � �]�®hZ ¬ W � Ö: W �o� T � �]_®YZ ¬ W �;� ©!ZF\Ø] � W ��kÕ¬ ¨ª]_X���W � T�®h��]�©!X �h¬ Wh®h� � ©!\^T�­!X � �] � ZFW � © � �W�ZFXFWU®�ÞsT � ­!W �Y¬ WY®j� � © ã\ TÔ­!X � ��] � ZFWKc�®YWj����Wo[FW � XF]�ß � W£A�i � W k�ã P � ©!Z �2¬ W �H¬ W � �©!X � e−

cµ− Wh� τ− c�VÔT�Z����a��ÔS � ©�Z �¬ W �H� ZsT � ä � Z!c�® Wj���c�Wh� ã P���S � ©�Z �¬ W � � ZsT � ä � [!c � Wh��« Ög: W �H� ZFT � ä � c � ­bT ¬ WY\ØWYXb� � ©�Z ã\^] �·k^¬ ¨ª]_X���W � T�®h��]�©!XÕÚ © � �WKc � © �Ó� ßY[�WYXb�oZFXMXF©!\'« � W � Z �F�F¬_� \ØWYXb��TÔ] � WKc ¬ T ®Y©!Z ¬ WYZ � c � ZF] � WhZ��

�F� WhXF[ � W � T � ®Y©!XbV!WhXb�]�©�X ¬ W � � � ©!] � VÔT ¬ WYZ �Ó�?� ©!ZF­�Wo« ¬ WhZ�©�Z�V�W � � ÖA X]AsX!c���©!Z��W �M¬ W �3� T � �]_®YZ ¬ W � [FZ N C ©!Xb��ZFXFW�T�Xb�] ã � T � �]�®hZ ¬ WKcL[�W \MrY\ØW¹\^T ��� Wdc ��� ]�XWh�H[FWB[FZ �Ó� WB[�W;V=]�Wdc=\^T�] � T V!WY®o[�W � ®�ÞsT � ­!W � Wh��[�W � XF©�\'« � W ��¬ W � �©�XF] � ZFW � Wh��«sT � `�©!XF] � Z�W �© �F� © ���h� Ö

PRk

Page 12: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

ö�÷¼ös÷�� % �����.�â�'�!ý]ü��7���¼�s�������s����ü� U���â�'ü��.���

9 XFW]�Xb�W � T�®j�]_©!X+WYXb� � W�[�WYZ4i � T � �]_®YZ ¬ W � [FW �Ó� ]�X � ZFW ¬ ®Y©!X � ZFW�W � �8]�Xb�W ���F�Ó� � � W®Y©!\Ø\^W¬ ¨ � ®�ÞsT�X�­!W [�¨ ZFXFW � T � �]�®hZ ¬ WØ[FW ��� ]_XÑWYXb�]_W � c�T ��� W ¬�� WØ«á© � ©!X ÖÄ7 W^[FW � XF]�W � ©!« � ]�� k�¬ T � ��T ã�] � �] � Z�W;[FW × © � W ã A ]�X � �Wh]�X!c � Z�] � ��] � Z ¬ W � ZFW;®Y©!Xb� � T�] � WY\ØWYXb�?T�Z=i Ú W � \Ø]�©!X � c ¬ W � «�© � ©!X � X�W� ©!Xb� � T �g� ©!ZF\Ø] � T�Z �F� ]_XF®Y] � WK[�¨ Wji4® ¬ Z � ]�©!X�[FW Ý T�Z ¬ ]=Wj� � WYZ4V!WYXb�f[�©!XF® � W � WY­ � ©!Z � W � [sT�X �g¬ W\<rh\^W � �TÔ� � ZsT�Xb��] � ZFW Ö4G ¬ W�i�] � ��W � ZsTÔ� � W;]_X���W � T�®h��]�©!X � Ú ©!XF[sTÔ\^WhX��T ¬ W �L¬ ] � � � W � ®h] ã [�W ��� ©!Z � |

• ¬ ¨ ]�Xb�W � T�®j�]_©!X,­ � T V=]_��T0�]�©�XFXFW ¬_¬ W k ¬ ¨ª© � ]�­!]_XFW3[FW ¬ ¨ T0��� � T�®h��]�©!X ��� ®Y] ��� © � Z�WE[FW � ®Y© �Ó�F�\ T ��� ]�Ú � WYXb� � WKWYZ4i*c � ©!Z ��¬ ¨ W~n�Wh��[FW ¬ WYZ � \^T �Ó� W Ö�A ¬_¬ W � W � T�]_� V � ÞF]_®YZ ¬_� W � T � ¬ WÄ­ � T V=]_��©!X ÖG ¬ X�¨ `�T,TÔZF®YZFX�W ��� WYZ4V!W W�i ���h� ]�\ØWYXb�T ¬ W¹[FW ¬ ¨ªW�i�] � ��WYXF®hW�[FW#®hW [�W � X�]�W � c2\ TÔ] �3¬ T�F���h� WhXF®YW�[FW � ©!XF[�W � ­ � T V=]_�TÔ�]_©!XFXFW ¬�¬ W �H� W � T�]_�?ZFX�W ��� WYZ4V!W�]_XF[F] � WY®j�mô � õ Ö

• ¬ ¨ ]�Xb�W � T�®j�]_©!X3ÚwT�]�« ¬ W � Z�]�T�­�]_� � Z �e¬ W �e� T � �]_®YZ ¬ W � Wh� � Z�]ÍW � � � W �Ó� ©!X � T�« ¬ W�[FW ¬ T [ �Y�Iã]�Xb� � ­ � T0�]�©�X βÖ�A ¬_¬ WBW � �?V � ÞF]�®hZ ¬�� W � T �?¬ W � «�© � ©!X � W± Wh� Z0 Ö

• ¬ ¨ ]�Xb�W � T�®j�]_©!X �h¬ WY®j� � ©!\ TÔ­!X � ��] � ZFW � ZF]�TÔ­!]_� � Z � ¬ W � � T � �]_®YZ ¬ W ��� © ���Ó� [sTÔX�� � ZFXFWf®�ÞsT � ­!W�Y¬ WY®h� � ] � Z�Wdc=®�¨ W � �?W ¬�¬ W � ZF] � W � \^Wj� ¬ W;\^T�]�Xb�]_WYXb� ¬ W �L�Y¬ WY®h� � ©!X � T�Z���©!Z � [�Z3XF©R`bT�Z3[FW �TÔ�©�\^W � Ö�C ©�X�«á© � ©!XET ��� ©=®Y] � W � � ¬ W � ÞF©���©!X { γ } Ö• ¬ ¨ ]�Xb�W � T�®j�]_©!XÕÚ © � ��W � Z�]ÍTÔ­!]_� � Z �e¬ W �?� T � �]_®YZ ¬ W �·� ZF] � © �Ó� ßh[FWYXb�BZ�XFW�®�ÞFT � ­!W�[FW�®Y©!Z 㬠WhZ � csTÔZ�� � WY\ØWYXb�?[F]_� ¬ W �·� ZsT � ä � Wj� ¬ W � ­ ¬ ZF©!X � Ö: T ®�Þ � ©!\Ø©4[4`4XFT�\^] � ZFW � ZFT�Xb�] � ZFW { ©!Z N 7�@ c?[FW ¬ ¨ªT�XF­ ¬ T�] � NBZsT�Xb�Z�\ 7 Þ � ©!\Ø© ã@ `=XsT�\Ø]�® � }8[ � ® � ]_� ¬ ¨ ]�Xb�W � T�®j�]�©�X�Ú © � �W Ö~A ¬�¬ W � © � �Z ¬ W ¬ ¨ Wji4] � �WhXF®YW�[FW�� � ©!] � XF©!\�« � W �� ZsT�Xb�] � Z�W � T �F� W ¬_�Y� ®h©!Z ¬ WhZ �#{ � ©!ZF­�Wdc~« ¬ WYZ¹Wj�oV!W � �@}@c�\^T�] ��� Z�]ÄXFW � ©�X�� � T � ©!« � W �IãVÔT�« ¬ W � W�i �á�Y� ]�\ØWYXb��T ¬ WY\ØWYXb� ÖL: T � `=\ � � � ]_W T �Ó� ©=®Y] �=k�¬ T � ©���TÔ��]�©!X,[FWE®hW � ®�ÞFT � ­!W �W � � SU(3)couleur

Ösn � ®YW­ � ©�Z � W;[FW � `=\ � � � ]�W � © ��� ßY[FWÞ�ZF]��?­ � X �h� TÔ��WYZ �Ó� c ¬ ¨ª]_X���W � T�® ã�]_©!X Ú © � �W^W � �'[F©!X�®^V � ÞF]�®hZ ¬�� W � T � Þ�ZF]_��«á© � ©!X � T �F� W ¬_�Y� ­ ¬ ZF©�X �|{ ­g}oWh� � Z �F� © ���h�[FWÕ\^T ��� W3X�Z ¬�¬ Wdcg®�ÞsT�®YZ�X � © � �T�Xb�UZFXFW3®�ÞFT � ­!W [FW3®Y©!Z ¬ WYZ � Wh� ZFX�W3®�ÞsT � ­�WÕ[�¨ªT�Xb�] ã®Y©!Z ¬ WYZ � cF[F©�XFXsT�Xb�8­ ¬ ©�«sT ¬ Wh\^WhXb�2ZFX � �TÔ� � T�X � ®h©!Z ¬ WhZ � Ö: ¨ª]_X���W � T�®h��]�©!X3Ú © � �W �F���h� WYXb��W ¬ W � [FWhZ4iM­ � TÔXF[FW � ® T � T�®j� �Y� ] � �] � ZFW �e� ZF]_VÔT�Xb��W � | ¬ T ¬ ] ã«�W � � � T � `=\ � �©Ô�] � ZFWKc�®Ô¨ªW � � k [F] � W � ZFW � ©!X ]�Xb�WhX � ]�� � [ � ® � ©"!�� � ZFT�XF[ ¬ TE[�] � �T�XF®hWWYXb� � W � ZsT � ä � [F]_\^]_X�ZFW:�FWj� ¬ W�®h©!X]AsX�WY\ØWYXb�B[FW �e� T � ��©!X �$# csWhXEWfn~Wj�;®hW � [�W � X�]�W �Ó� X�W� ©!Xb� � T � ©!« � W � VÔT�« ¬ W k3¬ ¨ � �TÔ� ¬ ]_« � WKc ¬ W � T � �©�X�] � © ¬_� V�T3[F©�XF® � W � WY®h©!\'«F]_XFW � T V!Wh®[�¨ªT�Z�� � W ��� ZsT � ä ��� ©!Z � Ú © � \ØW � Z�X ÞFT�[ � ©�X!c~ZFX#®h©!\ � © � ]_�W�XFWYZ4� � W [FWU®h©!Z ¬ WYZ � Ö n X[F]_� � Z~¨ª] ¬ � ¨ ÞsT�[ � ©!XF] � W Ö

: W CFN [ � ® � ]�� ¬ W � ]�Xb��W � TÔ®h�]_©!X � ÚwT�]_« ¬ W � c �h¬ WY®j� � ©!\ TÔ­!X � ��] � ZFWfWj�ÍÚ © � �WK\^T�] � � T �g¬ ¨ª]_Xb�W � T�®h��]�©!X­ � T V=]_�TÔ�]_©!XFXFW ¬�¬ W Öf: WM�T�« ¬ WYT�Z P Ö a �Ó�Y� ZF\^WE®YW � ]�Xb�W � T�®j�]�©�X � Wj� ¬ W � ®YT � TÔ®h� �h� ] � �] � ZFW � [�W¬ WYZ �§{w� }H«�© � ©!X { � }�\ � [F]�TÔ�WhZ �§{ � } Ö

%'&)(+*�,.-$/1032$4.*5*62$470589(:*5;7<.-=/3>?*@(�0A89(:*�B$8C<�2$4D*�EP!P

Page 13: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

G Xb�W � T�®j�]_©!X à � ©!Z � Wo[FW × © � ©�X {w� } N T �Ó� W 7 ÞsT � ­�W �h¬ Wh®h� � © ã� `=\ � � � ]_W T ��� ©4®h] ��{ � } à WyO \ T�­�X � ��] � ZFWà � TRV=]���TÔ��]�©!XFX�W ¬�¬ W ­ � T V=]_�©�X5 T�]_« ¬ W C49 { ad} W±, Z0 c!k Ö�� csl�P Ö a ±1

c�kA ¬ WY®h� � © ã \ TÔ­!X � ��] � ZFW 9 { P"} γ

k k5 © � ��W C49 { S^} gi

{ i F P k c�} k k��� � P Ö a�� : W � ]_Xb�W � T�®h��]�©!X � Ú ©!X�[sT�\ØWYXb��T ¬ W � [ � ® � ]��W �L� T �L¬ W CFN c ¬ W8­ � ©!Z � W8[FW � `=\ � � � ]_WT�Z � ZFW ¬ W ¬�¬ W � T �F� T � �]_WYXFX�WYXb�qc ¬ WhZ �§{ � }f«�© � ©!X { � }KT ��� ©4®h] �^{w� }fT V!Wh® ¬ WhZ � \ T ��� W8Wh� ¬ WYZ � ®�ÞsT � ­!W�Y¬ WY®h� � ©!\^T�­!X � �] � ZFW Öð Ð:G Ï ²3É2¸�³Í½h�¼É2¥h�?±D� ³�¸IH�£½j·�¥j� ���°Á É?±�£�º3½Y§�Á �µ´3�Æ» ½j¿�¿�§ös÷��ä÷¼ö KJ�L �JýM�.� L �.�5���ý��N��üN�'OP�.�: T < Þ � © � ]�W �Y¬ Wh®h� � ©�ÚwT�]_« ¬ W ô ó õàôªQKõ�ZFXF]BAsW ¬ W � ]�Xb�W � T�®j�]�©�X �L�h¬ Wh®h� � ©!\^T�­!X � �] � ZFW8Wh�HÚwT�]�« ¬ W ÖA ¬�¬ WLW � �fÚ ©!XF[ � W � Z �f¬ W � �Þ � © � ]�W � [FWÍÒ�T�ZF­!W ¬ ©=® T ¬ W � Ö!7 W ¬_¬ W �Iã ®h]�[ � ® � ]�V!WhX�� ¬ ¨ª© � ]�­!]_XFWK[FW � ]_X���W �IãT�®h��]�©!X � Ú ©!XF[sT�\ØWYXb�T ¬ W � ®h©!\Ø\^Wf®h©!X ���~� ZFWYXF®hW�[FW ¬ ¨ ]�XbVÔT � ]�T�XF®hWÄ[FW �Í� Þ � XF©!\ØßYXFW �Í� Þb` � ] � ZFW �[sT�X � [FW � � � TÔX � Ú © � \ T0�]�©�X � [�W8Ò�T�ZF­!W ¬ ©=® T ¬ W � Ö�: T < Þ � © � ]�W �h¬ Wh®h� � ©�ÚwT�]_« ¬ WW � �o«sT �Ó� W � Z �B¬ W­ � ©�Z � WH[FW � `=\ � � � ]�W SU(2)L×U(1)Y

Ö!: W � � � T�X � Ú © � \ TÔ��]�©!X ��� ©�Z � SU(2)LWh�

U(1)Y� ©!Xb�

� W ��� WY®h��]_V�WY\ØWYXb�U[ � ® � ]��W �'� T ��¬ ¨ ] � © ��� ]_X�ÚwT�]_« ¬ W Wh� ¬ ¨ Þb` � W � ®�ÞsT � ­!W Öf: ¨ ]�XbVÔT � ]�T�XF®hW^[FW �'� Þ ��ãXF©!\ØßYXFW �� Þb` � ] � ZFW �'� ZF]�VÔT�Xb� ¬ W � � � T�X � Ú © � \^TÔ�]_©!X � [�W^®hW � [�WYZ4i ­ � ©!Z � W � ]�\ �F¬ ] � ZFW ¬ ¨ªT �4ã� T � ]_�]_©!X#[FW � ZsT0� � W^«�© � ©!X � [FWÒ�TÔZF­!Wdcg\^T�] �¬ T3�Þ � © � ]�W �Y¬ Wh®h� � ©�ÚwT�]_« ¬ W �F�Ó� [F]���Z�XFW \^T ��� WX�Z ¬�¬ W � ©!Z � ®hW � «á© � ©!X � c~®YW � ZF]ÍW � �BWYX¹®Y©�X�� � T�[�]�®h��]�©!X TRV�WY® ¬ W � ©�« � W � VÔTÔ�]_©!X � W�i ���h� ]�\ØWYX ã��T ¬ W � Ö~A n�WY®h��]_V�WY\ØWYXb�qc ¬ T^\^T ��� WU[FZ¹«á© � ©!X Z {w� W ��� Ö W± }eW � � �F� ©=®�ÞFW'[�WUl�P à WyO {w� W �Ó� Öc!k à WyO�} Ö�: W\ � ® T�X�] � \ØWo[FW m ]_­!­ � c�[ � ® � ]_�8[sTÔX �e¬ T �F� ©=®�ÞsT�]_XFW � Wh®h�]_©!X!c � W � \^Wj�e[�W ¬ WhV!W �®YWj���W®h©!Xb� � TÔ[F]�®j�]�©�X Ö

ös÷��ä÷3� (QL �iüs���.�� U�R�Q�TSU��VNV��: We\ � ® T�X�] � \ØW8[FW m ]�­!­ � ô ô õ:ô cKõàôªl�õàô PRkKõàô P!Põ&c �F� © � © ��� [sT�X �L¬ W � T�XFX � W � Q�k � T � m ]_­!­ � c× � ©�Z��qc A XF­ ¬ W � �qc à Z � T ¬ XF]�ä7c m T�­!WYXMWh�;Ùo]�«F« ¬ WT � � � ]�XF®h© ��� © ��� k ¬ TU�Þ � © � ]_W«sT ��� W � Z �e¬ T

� `=\ � � � ]�W�[�ZU­ � ©!Z � W SU(2)L×U(1)Y� ©�Z � Ú © � \^W ��¬ T;��Þ � © � ]�W �Y¬ WY®h� � ©�ÚwTÔ]�« ¬ W { V!©!] �Ä� Wh®h�]_©!XP Ö a Ö Pq} Ö!G ¬s� W � \^Wj�qc!WhXØT�ÒÓ©!Z��T�Xb�KZFX^®�ÞFT�\ � � ® T ¬ T�] � Wdc�[�W ��� ©RV!© � ZFW �K¬ TB« � ] � Z � W?[FW � `=\ � � � ]_W

� ©�Z �ͬ W � «sT ��� W �f� XFW � ­!]�W � Wh�ÄT�]�X � ]4[�WH­ � X �Y� W � ZFX�W�\ T ��� W � ©�Z ��¬ W � «á© � ©!X � W± Wj� Z0 c��©�Z��WYX ®Y©�X � W � VÔT�Xb� ¬ ¨ ]�XbVÔT � ]�T�XF®YWL[FW�Ò�T�ZF­!W2[�Z ¬ T�­ � T�XF­!]_WYX Ö�7 W?\ � ® T�XF] � \ØW�Wji �F¬ ] � ZFW � ­bT ¬ Wh\^WhXb�¬ ¨ © � ]_­!]�X�W�[FW ¬ TÕ\^T �Ó� W [FW � Ú W � \^]_©!X � ®h©!\^\ØWUZFXFW ]_X���W � T�®h��]�©!X#T V!Wh® ®hWØX�©!Z�V!WYT�Z ®�ÞFT�\ � Ö: Wo«�© � ©!X�[FW m ]�­�­ � cFW � �8ZFXFW®h©!X ���~� ZFWYXF®hW'[F] � WY®j�?[FZ�\ � ® T�XF] � \ØWo[FW m ]_­!­ � Ö�XW���W_��Ww� WKø,+Ôú�õ��Û��ögø,LMý�/7/�

E��ù ÷0ü�öÍÿ1+�ù�ý ü*�,ö�-�ÿ1� +Ôú�õ��Û�b�q+!õ�� õsýw÷�ø: WB\ � ® T�X�] � \ØWB[FW m ]�­�­ � ®Y©�X � ] � �W k ]_Xb� � ©=[FZF] � WeZFX3®�ÞsT�\ �+� ® T ¬ T�] � Wdc ¬ W;®�ÞsT�\ � [FW m ]_­!­ � c� ZF]�]_X���W � T�­!]_�ÍT V!Wh® ¬ W ��� T � �]_®YZ ¬ W �1� Z�]�©!Xb�f[FW � ]�Xb��W � TÔ®h�]_©!X �g�Y¬ WY®h� � ©�ÚwTÔ]�« ¬ W � Ö�6 ]�X � ] ¬ WH®�ÞsT�\ �[FW m ]_­!­ � [F©�]_��T V!©!] � ZFX ] � © ��� ]_X ÚwT�]�« ¬ W'Wh��ZFX�WØÞb` � W � ®�ÞFT � ­!WØXF©!X X�Z ¬�¬ W Ö : W ®�ÞF©!] i � © � ��W� Z � ZFXM[F©!ZF« ¬ Wh�8[FW�®�ÞsT�\ �F�e� ® T ¬ T�] � W � Wh�e®Y©�\ �F¬ Wji4W � cáT �F� T � �WhXsT�Xb� k SU(2)L

Öá: ¨ªZFXM[F©!]��rh� � WØ®�ÞsT � ­ �^�h¬ WY®j� � ] � ZFWY\ØWYXb��Wh� ¬ ¨ªT�Z�� � W [F©!]��mrh� � WØXFWYZ�� � W ÖÍG ¬ T+[F©!XF® ¬ TÕÚ © � \^W � Z�]_VÔT�Xb�WKc

P�a

Page 14: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

TRV�WY® � [FWY­ �Ó�Y� [FW ¬ ]_«�W � � �h� |

Φ =

(

Φ+

Φ0

)

=1√2

(

Φ1 − iΦ2

Φ3 − iΦ4

)

. { P Ö P"}: W ¬ T�­ � T�XF­�]�WYX [FZM®�ÞFT�\ ��� ®YT ¬ TÔ] � WBT ¬ T'Ú © � \ØW � Z�]_VÔT�Xb�W |

LΦ = |DµΦ|2 − V (Φ). { P Ö a^}− : W �F� Wh\^]_W � ��W � \ØWB[FZ ¬ TÔ­ � T�X�­!]�WhX W � � ¬ WB�W � \ØWB®Y]_X � ��] � ZFWKcF] ¬ ®h©!\ �F� WhXF[ ¬ W � ��W � \^W � [FW\ T �Ó� WU[FW � «�© � ©!X � [�WBÒ�TÔZF­!WUT�]_X � ] � ZFW [FW � �W � \ØW � [~¨ª]_X���W � T�®h��]�©!X � WhXb� � W ¬ W � ®�ÞsTÔ\ �F� [�WÒ�T�ZF­!W�Wh� ¬ W�®�ÞsTÔ\ �¹� ® T ¬ T�] � W Ö Dµ

W � � ¬ TØ[ �Y� ]_V � WU®Y©RVÔT � ] T�Xb�WKc�]_Xb� � ©=[FZF]��eTKAsX¹[FW � W �Ó� Wh®h�W �¬ ¨ ]�XbVÔT � ]�T�XF®YWe[FW�Ò�T�ZF­!W ÖsA ¬�¬ W;W � �e[ � AsXF]�W � T � |

Dµ = ∂µ + igτa

2Wµa + ig′Y

2Bµ, (a = 1, 2, 3) { P Ö S�}

gWh�

g′ � ©�X�� � W ��� WY®j�]_V�WY\ØWYXb� ¬ W � ®h©!X � ��T�Xb�W � [FW?®h©!Z �F¬ T�­!W2[FW � ­ � ©!Z � W � SU(2)LWh�

U(1)Yc

τa � ©!Xb� ¬ W � \^TÔ� � ]�®hW � [FW Ý T�Z ¬ ]pc Y W � � ¬ ¨ªÞb` � W � ®�ÞFT � ­!W�ÚwT�]�« ¬ Wdc Wµa� ©!Xb� ¬ W � � � ©!] � ®�ÞFT�\ ���[FZM­ � ©!Z � W SU(2)L

Wh�Bµ

W � � ¬ Wo®�ÞsTÔ\ � [FZ+­ � ©�Z � W U(1)Y

Ö

− : WL[FWhZ4i4]�ßh\^Wf�W � \ØWK[FZ ¬ T�­ � TÔXF­!]�WhXoW � � ¬ W � ©���WYXb�]_W ¬b� ®YT ¬ TÔ] � W V (Φ)c�] ¬ ]_\ �F¬ ] � ZFWKcY®Y©�\^\ØW©!X ¬ W�V!W ��� T �F¬ Z �D¬ ©!]�Xic�ZFXFW8\^T ��� W � ©!Z �K¬ W2«�© � ©!X [�W m ]�­!­ � Wh�L[FW � ]�Xb�W � T�®j�]_©!X � [FZØ®�ÞsT�\ �[FW m ]_­!­ � T V!Wh® ¬ ZF] ã \MrY\ØW ÖÍn X ®�Þ�©!] � ]_� ¬ W � ©Ô�WYXb��]�W ¬H� WYX�© � \^T ¬ ] � T�« ¬ W ¬ W �F¬ Z �'� ]�\ �F¬ W � ZF]« � ] � W ¬ T � `4\ � � � ]_W |

V (Φ) = µ2|Φ|2 + λ(|Φ|2)2, { P Ö�� }µW � �2ÞF©!\Ø©!­!ßhXFW k ZFXFWB\^T �Ó� Wdc4Wh� λ

W � ��Z�X � T � TÔ\^ßj� � W8[�¨ªT�Z���© ã ®h©!Z �F¬ T�­!W � T�X � [F]�\ØWYX � ]�©!XWh�8] ¬ W � � � Z ���h� ]_WYZ �ek k � ©!Z �h� ZFW V (Φ) � ©!]��?«�© � X � ]_X�Ú �Y� ]�WYZ � WY\ØWYXb� Ön X V!©�]_�Ø[F©!XF® � ZFW ¬ W ¬ T�­ � T�XF­!]_WYX [FZ,®�ÞsT�\ �-� ® T ¬ T�] � W3W � � ]�XbVÔT � ]�T�Xb� � ©!Z � � � T�X � Ú © � \^T ã�]�©�X3[FWHÒ�T�ZF­!W ¬ ©=® T ¬ W;[�W SU(2)L × U(1)Y

Ö

Y õ�� ø=ÿg÷^ö�ø,�¼- ûbùRõ�ù^ö�ø[Z�ýwö�ø: ¨ � �TÔ�oÚ ©!XF[FT�\^WhXb��T ¬ [�¨ ZFX ®�ÞsT�\ � c � ZF]f®Y© ��� W ��� ©!XF[ k+¬ ¨ � ��TÔ�[�W V=]_[FWdc W � ��[ � AsX�]f®Y©!\Ø\^W� ��TÔX�� ¬ T V�T ¬ WYZ � [FZ ®�ÞFT�\ � c ΦV EV

c � ZF]�®h© ��� W �Ó� ©!X�[#T�Z \Ø]�XF]_\'ZF\Î[�Z � ©���WYXb�]_W ¬ Ö�: W � © ã�WYXb��]�W ¬ [FW ¬ ¨ A � Ö { P Ö�� } � WhZ�� �F� WhXF[ � W�[FWhZ4i3Ú © � \^W � [F]Dn �Y� WYXb�W �e� ZF]_VÔT�Xb� ¬ W � ]�­!X�W�[�W µ2|

− � ] µ2 > 0c ¬ W � ©��WhX���]�W ¬ X�¨ªT � Z~¨ªZFX1\Ø]�XF]_\'ZF\ k ΦV EV = 0

c { V!©�] � As­�Z � W P Ö P T�}fc©!X [F]_�UT ¬ © �Ó�l� Z�¨ ] ¬ X�¨ ` T � Z~¨ªZFX\O A O { VÔT�®YZFZ�\ÆWji � WY®j��TÔ��]�©!X VÔT ¬ Z�W§}�Wj�U©!X V!©!]�� � ZFW ¬ W� ©���WYXb�]_W ¬ W � � � `=\ � � � ] � ZFW Öá7 W�®YT � XFW � W � \ØWh� � T � [�W�« � ] � W �?¬ T � `=\ � � � ]_W:�

− � ] µ2 < 0c ¬ W|O A OÈT¹ZFX�W�VÔT ¬ WYZ � XF©�X,X�Z ¬_¬ W+Wh� ¬ W � ©���WYXb�]_W ¬2�F� WYXF[ ¬ T Ú © � \ØW3[�¨ ZFX>I®�ÞsT � W TÔZU\^W�i�]_® T�]_X'?�c { V!©!] � As­!Z � WoP Ö P�«7} Ö�G ¬ `�ToT ¬ © ��� Z�XU®Y©!Xb�]_X�ZFZF\è[FW�VÔT ¬ WhZ ���Ä� © �Ó� ]�« ¬ W �

� ©!Z � ΦV EVWj� ¬ W�®�ÞF©!] iE[~¨ªZFX¹\Ø]�X�]�\'ZF\vcsT � «F]_� � T�] � WKcs« � ] � W �Ó� ©�X��T�X � \^WhX�� ¬ T � `=\ � � � ]_W7\ Ö

]:^�4�,.-=/389(`_?( a�/3bC*6<�/3(�_?(c*6d7egf�06/3b9(`*1,"2$470�-=4�f+(�;7<.-=4D_h8C(+*if+;7<.-=06bC2$4.*�_?<�ej2k<�l$(+eg(�470�;7<�b�Bk2$<�lk(�/34�(�4708nm f�l$2k89<�06bC2$4�_om <�4g*1d?*106p+ej(�*62$470�bC4qlr-$/6bs-=4703(+*t*12k<.*t<�4�(@06/�-=4.*1uv2$/3ew-x06bC2$4)y+ew-=bs*t;k<)m <�4.(�*62$8C<?03b92k4�,.-$/103bCz�<�89bCp�/3(4.( 8nm (+*10A,.-$*+EPRS

Page 15: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

{�|~}w� P Ö P�� 5 © � \^Wo[�Z � ©��WhXb�]�W ¬ [FZ�®�ÞsT�\ � [FW m ]�­�­ � | { T�} µ2 ≥ 0� { «7} µ2 < 0

Ö

n X �F� WhXF[+WYX3­ � X �Y� T ¬~¬ T � © ¬ Z���]�©!X � T � �]�®hZ ¬ ]_ß � W � ZF]_VÔT�Xb�WKc � ZF]�X~¨ªW � � � T ��� `=\ � � � ] � ZFWo[sTÔX �SU(2)L × U(1)Y

|

ΦV EV =

(

0ν√2

)

, { P Ö ó }

νW � � ¬ TlO A OXcsW ¬_¬ W � ¨ªW�i ��� ]�\ØW � T � ν =

−µ2

λ

csWh�2VÔT�Z��;a � Q à WyO Ön X � WYZ���] ¬�¬ Z � � � W �o¬ W � Þ � X�©!\^ßhXFW [�W#>I« � ] � Z � WØ[FW � `=\ � � � ]�W ��� ©!Xb��T�X � Wf? T V!Wh® ¬ WØ® T � [FZÚ W �Ó� ©!\^T�­!X � �] � \ØW Ö Ý ©�Z � [FW � �Wh\ �á�Y� TÔ�Z � W � T ��� W Ü3�h¬ WhV � W � c ¬ W � [F] �S!¬ W � \^T�­!X � �] � ZFW � XFW� ©!Xb� � T � T ¬ ]�­!X �h� cF] ¬���� ¨ª© � ]�WhXb�WYXb�e[sT�X � [FW � [F] � Wh®h�]_©!X � T ¬_� TÔ��©!] � W � cF©!X�[F]_� � ZFW ¬ W � ` � �ßY\ØWW � ��]_X�VÔT � ] T�Xb� � ©!Z ��� ©��TÔ�]_©!X Ö Ý T � ®h©!Xb� � Wdc�WYX�[FW �Ó� ©!Z � [�¨ ZFXFW ®hW � ��T�]_XFWU�WY\ �á�Y� T0�Z � Wdc ¬ W �[F] �S!¬ W ��� ¨ T ¬ ]�­�XFWYXb� � W ¬ ©!XUZ�XFW?®YW � ��T�]_XFW2[F] � WY®j�]_©!X!c�®hW � Z�]s« � ] � W ��� ©!Xb��TÔX � \ØWYXb� ¬ T � `=\ � � � ]_W[FW � ©���TÔ��]�©!X Ö~@ W ¬ T \MrY\ØW�ÚwT"�Y©�X!c~XF©Ô� � WU\ � ®YT�XF] � \ØW�]�\ �F¬ ] � ZFW�ZFXFWU« � ] � Z � W'[FW � `=\ � � � ]_W��� ©!Xb��T�X � W � ©�Z �2¬ W �8� XFW � ­!]�W � ÚwT�]�« ¬ W � Ö

�3û��gû�÷�õ�ù�ý ü��ö�ø,�wõZ� õ��q�Yø ö�ø�� � ü�Yü�1� ö�ø õFÿ1/�øA XM[ � V!W ¬ © �F� T�Xb� ΦV EV

T�Z4�©!Z � [�ZM\Ø]�XF]_\'ZF\Å[FZ � ©Ô�WYXb��]�W ¬ cF©!X�T |

ΦV EV ' 1√2

(

0

ν + H

)

, { P Ö Q^}

©^z m W � � ¬ We®�ÞsTÔ\ � [FZÕ«á© � ©!X^[FW m ]�­!­ � Ö=A X � Wh\ �F¬ T"� TÔX�� ΦV EV� T �D� T�VÔT ¬ WYZ � [sT�X �H¬ ¨ A � ÖP Ö a�c=[FW � ��W � \^W � [FWe\ T �Ó� W ��� ©�Z �L¬ W � «�© � ©!X � [FWKÒ�T�Z�­!WBT ��� T � TÔ] ��� WYXb��[FT�X �H¬ W ¬ T�­ � T�XF­!]_WYX |

|DµΦ|2 =g2ν2

4W+W− +

g2 + g′2ν2

8

(

gW3 − g′B√

g2 + g′2

)2

, { P Ö ô }

P �

Page 16: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

W+ Wj�W− � W �����Y� WYXb�WhXb� ¬ W � [FWhZ4i �F� WY\Ø]�ß � W � ®Y©=© � [F©�XFX � W � [FZ ®�ÞsT�\ � Wµ

cÄWj�W3

¬ T� � ©�] � ]_ßY\ØW Ö46 ]�X � ]�©!X�©!«���]�WhX�� ¬ ¨ªW�i �F� W ��� ]_©!X�[FW ¬ T'\^T ��� W�[�W � «�© � ©!X � W± Wh� Z0 |

MW± =gν

2, MZ0 =

g2 + g′2

2ν, Mγ = 0 { P Ö c^}

n X¹V�©!]_�o[�©!XF® � ZFW ¬ W � ÞF©��©�X � W � �W � TÔX � \ T �Ó� W Ö�C ]Ä©!X#[ � AsXF]�� θWc ¬ ¨ªT�XF­ ¬ W�[FW \ �Y¬ T�XF­!W[FW � ®�ÞsTÔ\ �F� W

Wh�B { ©!Z T�XF­ ¬ W [�WÕâ Wh]�X�«�W � ­g} � T � cos θW = g√

g2+g′2

c�T ¬ © ��� ©�X V�©!]_�� Z�W |

MW±

MZ0

= cosθW . { P Ö l�}

�Õû��gû�÷�õ�ù�ý ü��ögø=�wõZ� õ���Yø¹ö�ø'�#� ø�÷��Ñý ü*�1�@ W�\MrY\ØW � ZFW � ©!Z �8¬ TU­ � X �h� TÔ��]�©!X+[FW�\^T ��� W�[�W � «�© � ©!X � [FWHÒ�T�ZF­!WKcs©!X�­ � XFß � W ¬ TU\^T ��� W[FW � Ú W � \Ø]�©!X � ­ � �Ô®YW T�Z � ©��WhXb�]�W ¬�� ® T ¬ T�] � W�[FW m ]�­!­ � Ö Ý ©!Z � ®YW ¬ TÕ©!X � © � WUZFX ¬ T�­ � T�XF­!]_WYX]�XbVÔT � ]�T�Xb� { ] ¬ XFWH[�©!]_�Í[F©!XF® � T � ®h©!Xb�WYX�] � [�WL�W � \ØWH[FWH\ T �Ó� W�W�i �F¬ ]_®Y]_��W � ©!Z �g¬ W � Ú W � \^]_©!X � }fc� ZF] � ©!X�W�i�]_­!W � ©!X�]�XbVÔT � ] T�XF®hW � ©!Z � SU(2)L × U(1)Y

cL®YW � ZF]e[F©!XFXFWEXsT�] �Ó� T�X�®YW k [�WXF©!Z�V�W T�Z4iØ��W � \ØW � [�¨ ]�Xb�W � T�®j�]_©!X WYXb� � W ¬ W2®�ÞFT�\ �^� ®YT ¬ T�] � W2Wj� ¬ W � ®�ÞsT�\ �F� [FWe\^TÔ��]�ß � W Ö�7 W �]�Xb�W � T�®j�]�©�X � ©!Xb�H[�W � ®Y©!X � ��T�Xb��W � [�We®h©!Z �F¬ T�­!W �F� © � © � �]_©!XFXFW ¬�¬ W �Jk¬ T\ T �Ó� W?[FW � Ú W � \^]_©!X �T ��� ©4®h] �Y� Ö Ý T � ®hW ��� ©=® � [ � c ¬ TU\^T ��� Wo[FW � Ú W � \^]_©!X ��� ¨ªW�i �F� ]_\^W®Y©�\^\ØW � ZF]�� |

Mfermion =λfν√

2, { P Ö PRk�}

©^zλf� W �����Y� WYXb�W ¬ Wo®h©!Z �F¬ T�­!Wo[FZ+Ú W � \^]_©!X3T�Z�«�© � ©!X+[FW m ]_­!­ � Ö

� ÷0ý�� ÿ�÷0øMö�ø,�wõZ�~$�� ûbùR÷0ýwø�û��wø�+�ùR÷�ü7� õsý � � ø: W \ � ®YT�XF] � \^W [FW m ]�­!­ �� W � \^Wj��[�©!XF®Ø[FW « � ] � W ��Ó� ©!Xb�T�X � \ØWYXb� ¬ T � `=\ � � � ]�W [FWBÒ�T�ZF­!W¬ ©=® T ¬ WØ[�ZÑ­ � ©�Z � W SU(2)L × U(1)Y

� ©!Z � [�©!XFXFW � [FW � \ T �Ó� W � T�Z4i�«á© � ©!X � W± Wh�Z0Wh�UTÔZ4i Ú W � \Ø]�©�X � ÖÍ7 ©!\Ø\^W ¬ ¨ªT�ÒÓ©!Z4��[FW^®YW^®�ÞsT�\ � [FW m ]�­!­ ��¬ TÔ] ��� W ¬ W^®�ÞFT�\ � T ��� ©4®h] � T�Z

� ÞF©���©!X � T�X � \ T ��� WKc ¬ T � `=\ � � � ]�W[FZM­ � ©�Z � W U(1)emW � �e®Y©!X � W � V � W Ö�A XMW~n�Wh�c ¬ TU®�ÞsT � ­�W

�Y¬ Wh®h� � ] � ZFWØT�X�XF]�ÞF] ¬ W ¬ ¨ � ��TÔ�oÚ ©�XF[sT�\ØWYXb��T ¬ c�Wj��] ¬ X�¨ ` T3[F©!XF® � T � [FWØ« � ] � Z � W [FW � `=\ � � � ]�W Ö: W�\ � ® T�XF] � \ØW'[FW m ]�­!­ �;� W � \ØWh�T�]_X � ]Í[FW'ÚwT�] � W � T ��� W �¬ T � `=\ � � � ]_W'[FWeÒ�T�Z�­!W ¬ ©=® T ¬ W�[�WSU(2)L × U(1)Y

c k ZFXFW � `=\ � � � ]�Wo[�W U(1)em

Ö7 Wh����W�« � ] � Z � W ��� ©!Xb��TÔX � W�[FW ¬ T � `=\ � � � ]�WX�¨ Wji4] � �W � ZFW � ©!Z � [FW � «sT �Ó� W �e� XFW � ­!]_W � Ö�6 ®YW �� XFW � ­!]_W � c ¬ ¨ª]_Xb�W � T�®h��]�©!XÕÚwTÔ]�« ¬ WBW � �e«�]�WYX�[ � ® � ]��W � T �2¬ T'�Þ � © � ]_Wo[FW 5 W � \Ø]�Wh�8W ¬�¬ WT �F� T � TD!���©��T ¬ Wh\^WhX��Ø[F]Bn �h� WhX���WE[FW ¬ ¨ ]�Xb��W � TÔ®h�]_©!X �Y¬ Wh®h� � ©!\^T�­!X � �] � Z�W ÖD7 W � WYX�[sT�Xb�qc k � � ß � ÞsT�Z���W� XFW � ­!]_W { [FW ¬ ¨ © � [ � W2[FWPRk!k à WyOm}fc ¬ T�>I«á© ��� Wf??[FT�X �K¬ TBÚ © � \^W2[FZ � ©��WhX���]�W ¬ W � �DX � ­ ¬ ]_­!W TÔ« ¬ WWh� ¬ T � `4\ � � � ]_Wo[FWHÒ�T�ZF­!WoW � � � W � ��TÔZ ��� W Ö�6 ®YW �e� ®�ÞFW ¬_¬ W � [�¨ � X�W � ­�]�W � c ¬ W � Ú © � ®hW �?�Y¬ WY®h� � ©!\^T ã­!X � ��] � ZFW � Wh�ÚwT�]�« ¬ W �e� ©!Xb��[FWhZ4i T �Ó� Wh®h� � [FW ¬ TÕ\<rh\^W�Ú © � ®hWdc ¬ T Ú © � ®hW �Y¬ Wh®h� � ©�ÚwT�]_« ¬ WKcáV�©!] �As­!Z � WØP Ö a Ö��W_��W_��W�� WDø � ü*�hü*�*ö�ø,LMý�/7/�¬ W «á© � ©�XÑ[FW m ]�­!­ � W � �UZFXFW ®Y©!X �Ó�� ZFWhXF®YW+[FZ \ � ®YT�XF] � \^WØ[FW m ]�­!­ � ÖÍn « � W � V!©�X �U¬ W �[FWY­ �Ó�Y� [FW ¬ ]�«áW � � � T V�TÔX��eWh�;T �F� ß �e¬ T « � ] � Z � W�[FW � `=\ � � � ]�W Ö�6 Z [ �h� T � �qc ¬ W � � � ©!] � ®�ÞFT�\ ���

P ó

Page 17: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

{|~}w� P Ö a�� d W �F�Ó�Y� WYXb��TÔ��]�©!X�[FW ¬ ¨ ZFXF]BAs® T0�]�©�X3[FW � Ú © � ®YW �8�Y¬ WY®j� � ©�\ T�­�X � ��] � ZFWBWj�8ÚwTÔ]�« ¬ W Ö

[FWKÒ�TÔZF­!W � T�X � \^T �Ó� W;[�W SU(2)L©!Xb�H��©!Z � a�[FWY­ �Ó�Y� [�W ¬ ]_«�W � � � c ¬ W8®�ÞsT�\ � XF©!XÕ\^T �Ó� ]_Ú�[FW

U(1)YWhX k a'c~Wh� ¬ W�®�ÞsT�\ � � ® T ¬ T�] � W�®h©!\ ��¬ Wji4WU]_X�� � ©=[FZF]��BWYX � © ��� ßY[FW � c~®�¨ W � ��ZFX¹��©���T ¬[FW'P�a�[�WY­ �Ó�Y� [FW ¬ ]�«áW � � � Ö=6 ��� ß �2¬ T�« � ] � Z � W ��� ©!Xb��TÔX � Wo[FW � `=\ � � � ]�Wdc4] ¬�� W � �W ¬ W � S'«á© � ©�X �

W± Wj� Z0 c � ZF] ©!Xb�eSU[FWY­ ���Y� [FW ¬ ]�«áW � � � ®�ÞsT�®hZFX ÖáA XMWfn~Wj�qc ¬ W � SU«�© � ©!X � ©!Xb�?WhX � ZFW ¬Ç� ZFW� © � �W�> �F� ] � ?B� � ©�] � [FW � [FWY­ �Ó�Y� [�W ¬ ]_«�W � � � [�Z ®�ÞsT�\ � � ®YT ¬ TÔ] � W�[sT�X �;¬ W �F� ©4®hW ��� Z �£� ZF] ¬ WYZ �T^[F©�XFX � ZFX�W'\ T ��� W Ö�: W � ÞF©��©�X XF©!X¹\^T ��� ] � ZFW�®Y©!X � W � V!W � W � a^[FWh­ ���h� [FW ¬ ]�«áW � � � Ö�7 W ¬ T[F©!XFX�W3[F©!XF®¹P!P+[FWh­ ���h� [FW ¬ ]_«�W � � � ÖÍG ¬ WYX � W � �W3ZFX [F©�Z Ü ]_ßY\ØWdc � Z�¨ ©!X XF©���W m �f®�¨ W � � ®YW[FWY­ ��� [FW ¬ ]_«�W � � �Q� Z�]g®h© ��� W �Ó� ©!X�[ET�Z�«á© � ©!X+[FW m ]_­!­ � cFZFXFW � T � �]_®YZ ¬ W � Þb` � ] � ZFW�\ T ��� ]�V!W ÖJ ©���©!X � WhX]AsX � Z�W ¬ W'®�ÞsT�\ � [FW m ]_­!­ � W � ��ZFX#®�ÞsT�\ �#� ® T ¬ T�] � Wdc�®YW � ZF]f]�\ �F¬ ] � ZFW � ZFW ¬ Wm ]_­!­ � W � �eZFX+«�© � ©!X�[FW ��� ]_X�X�Z ¬ ÖA X � WY\ �F¬ T"�YT�Xb�oP Ö QU[sT�X � P Ö a'c ¬ W ¬ T�­ � T�XF­!]_WYX3T �Ó� ©=®Y] � T�ZM®�ÞFT�\ � [FWjV=]�WYXb� |

LΦ =

(

∂µ + igτa

2Wµa + ig′Y

2Bµ

)

(ν + H)√2

(

0

1

)∣

2

− µ2 (ν + H)2

2− λ

(ν + H)4

4

: T �F� Wh\^]_ß � W � T � �]�WH[FW�®YW ¬ T�­ � T�XF­!]_WYX�[�©!XFXFW ¬ W � ��W � \ØW � [�W�\ T ��� W?TÔZ4iU®�ÞsTÔ\ �F� [FWÍÒ�T�ZF­!Wà�¬ TØ[FWYZ4i4]_ßY\ØW � T � �]�W�®Y©!Xb��]�WYXb�o[�W � �W � \ØW �£� ZF]Í]�\ �F¬ ] � ZFWYXb� � WYZ ¬ WY\ØWYXb� ¬ W'®�ÞsT�\ � � ® T ¬ T�] � Wm�ÖsA X�[ � V�W ¬ © �F� T�Xb�e®YW[FW � XF]_W � cs©�X�©�«��]_WYXb� ¬ W � ��W � \^W �8� ZF]_VÔT�Xb� � |

− 1

2(−2µ2)H2 +

µ2

υH3 +

µ2

4υ2H4 − 1

4µ2υ2, { P Ö P!P§}

¬ W � [FWhZ4i4]�ßh\^WeWh�H� � ©!] � ]_ßY\ØW��W � \^W �H� ©!Xb�?T ��� ©4®h] �h�äk [�W � ]_Xb�W � T�®h��]�©!X � [FZ ®�ÞsT�\ � [FW m ]�­!­ �T V!WY® ¬ ZF] ã \MrY\ØW Ö4: W �F� WY\Ø]�W � ��W � \^WW � �BZFX��W � \ØW�[�W�\^T ��� W � ©!Z �8¬ W m ]�­!­ � T V�WY® MH =√

−2µ2ÖÍ7 ©!\Ø\^W V=Z �F��� ® � [�WY\Ø\^WhX��c µ2 [F©!]��lrj� � W X � ­bT0�]_Ú � ©�Z �l� ZFW ¬ TM« � ] � Z � W^[FW ¬ T� `=\ � � � ]�WT�]�� ¬ ]_WYZ!c�\ T�] ��� T'VÔT ¬ WYZ �2� W � ��W�]_XF[ � �W � \^]_X � Ö: T \^T �Ó� W[FZ m ]�­�­ � [FWY\ØWYZ � W�[F©!XF®]�X�®Y©!XFX�ZFWKc�®YW � WYX�[sT�Xb�;[�W �8� WY®�Þ�W � ®�Þ�W � ��Þ � © � ] � ZFW � Wj�Wji �á�Y� ]_\^WhXb��T�Z4i � W � \ØWh����WYXb��[FW [ � AsX�] � [FW � ­bT�\Ø\^W � [FW \ T ��� W � TÔ®Y®YW ��� ]�« ¬ W � TÔZ�«á© � ©�X �[FW m ]_­!­ ��� ©!Z � ­!ZF]_[FW �2¬ W �2� WY®�ÞFW � ®�ÞFW � Ö

PRQ

Page 18: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

{|~}w� P Ö SI� 7 ©�X�� � T�]_Xb�W � ��Þ � © � ] � ZFW �2� �T�« ¬ ]_W � WhXÕÚ ©!XF®j�]�©�X3[FW ¬ ¨ � ®�ÞFW ¬�¬ W;[�¨ � XFW � ­!]_W#ô�PRa"õsô PRS�õô�P � õ Ö~: TÕ«sT�XF[FW � Z �á�Y� ]�WYZ � W � ©!ZF­!W { � W ��� Ö ]_X�Ú �Y� ]�WhZ � WV!W � �Wq} � W �F���h� WYXb��W ¬ T^Ú � ©�X���]�ß � WHA4i � W� T �ج W ��� ­�]�\ØW � W � �Z � «sTÔ��]_Ú { � W ��� Ö ¬ T � �T�«F] ¬ ]_� � [�Z,V=]�[FWq}*� ¬ WYZ �^¬ T � ­!WhZ � [ �Y� WYX�[FWYXb�3[FW �]�XF®hW � ��]_��ZF[FW � Ö�: T�­bTÔ\^\ØW'[FWØ\ T ��� WØT�®h®YW ��� ]_« ¬ W^T�Z «�© � ©!X [FW m ]_­!­ �� WU� � ©!Z�V�W^WhX�� � W ¬ W �[FWYZ4i3«sT�XF[FW � Ö

ð Ð�� ñ £ ³��?±f²3��³�±f²3�Æ´+¶ » ½j¿�¿�§°£�¶ Ï���ÇB£� ³Í¸�º: W CFN X�W3[F©!XFXFW+TÔZF®YZFX�W3]�XF[F]_® TÔ��]�©!X � Z �U¬ TE\^T ��� WÕ[FZ «�© � ©!X [FW m ]�­!­ � c�\^T�] � [FW �

� WY®�Þ�W � ®�Þ�W � ��Þ � © � ] � ZFW � T�]_X � ] � ZFW ¬ W ��� WY®�ÞFW � ®�ÞFW � Wji �á�Y� ]�\ØWYXb��T ¬ W � [F] � WY®j�W � Wj��]_XF[F] � WY®j�W �©!Xb� � W � \^] � [FW+[ � AsXF] � [FW � ­!T�\^\ØW � [FWM\^T �Ó� W � T�®h®YW ��� ]_« ¬ W � TÔZ «á© � ©!X � [FW m ]�­�­ � Öf: W �� WY®�Þ�W � ®�Þ�W � Wji �á�Y� ]_\^WhXb��T ¬ W � ©!Xb�U[�¨ªT�«�© � [ � � �Õ�Ó� T ¬ ] �Ó� W � T�Z :�A Ý ZFXÑ®Y© ¬�¬ ] � ]_©!XFXFWhZ � e+e−TRV�WY®�ZFXFW � X�W � ­�]�W�T�Z�®YWYXb� � W�[FW\ T �Ó� W[FW�a�k!k à WyOXc � Z�] � T�Z < WjVÔTÔ� � ©!XMZ�XM®h© ¬�¬ ] � ]_©!XFXFWhZ �ppT V!Wh®�ZFX�W � XFW � ­!]�W�T�Z+®hWYXb� � W�[FW\^T ��� W[FW P Ö l�c < WyO Ö

ö�÷1�·÷øö �Z�s�â��ý�üN�.�â�'��� � J�L �JýM�.ùäú����@ W � ®YT ¬ ®hZ ¬ W � [ � ��T�] ¬�¬_�Y� «sT �Ó�Y� � Z � ¬ ¨ �~� ZsTÔ�]_©!X-[�Z-­ � ©!Z � WE[FW � WYX�© � \^T ¬ ] � TÔ��]�©!X � ©!Z �

¬ ¨ªT�Z��© ã ®Y©�Z �F¬ TÔ­!W3[FZ m ]�­!­ � ô P�a�õHô PRSKõHô�P � õpcK\Ø©!Xb� � WYXb� � Z�¨ ZFX�«á© � ©�X-[FW m ]�­�­ � T V�WY® ZFX�W\ T �Ó� WD� � © � ­ � TÔXF[FW � WYXF[ ¬ WL\Ø©4[�ß ¬ WDXF©!X ã � W � ��Z � «FTÔ�]�Ú {w¬ W � ®YT ¬ ®hZ ¬�� [F]_V�W � ­!WYXb�@}@c�Wj�fZFX m ]�­!­ �[FW\ T �Ó� Wo� � © � ÚwT�]�« ¬ WB[ �h� �T�«F] ¬ ] � W ¬ ¨ � �TÔ�2Ú ©!XF[sTÔ\^WhX��T ¬ c=V!©!] � As­ Ö P Ö S Ö

ö�÷1�·÷�� �Z�s�â��ý�üN�.�â�'��� �i�w� L ýM�� U���â�'üN�¼�������.ý]�5��'���: W ��¬ ]�\Ø]_�W �B¬ W ��F¬ Z � ®h©!Xb� � TÔ]�­!XsTÔX���W � ©!Xb� � � �Ø� �T�« ¬ ]�W �o� T �¬ W � W�i �á�Y� ]�WhXF®YW � [FZ :gA Ýô�P ó õ { : T � ­!W A ¬ Wh®h� � ©!X ã Ý © � ]_� � ©!X�®h© ¬�¬ ]�[FW � }@c ®Y© ¬_¬ ] � ]�©�XFXFWYZ � e+e−

[FZ 7�ADd8J � ZF]�T8Ú ©!X�®h�]_©!XFX �P ô

Page 19: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

{|~}w� P Ö�� � J ]_V�W T�Z�[FW#®Y©�X]A�T�XF®hW¹[FW ¬ T �����Y� WYXF®hW�[~¨ªZFX1«á© � ©!X�[FW m ]�­!­ � WYX*Ú ©!XF®j�]_©!X[FW � T \^T ��� Wdc � ©�Z �^¬ W � Wji �á�Y� ]_WYXF®hW � [�Z :�A Ý ÖH: T ¬ ]�­�XFW �F¬ Wh]�XFW+XF©!] � W {w� W ��� Ö � ©!]�Xb��] ¬�¬_� W« ¬ WhZFW§} � W �F�Ó�Y� WYXb�W ¬ T ¬ ]_\^]��W8©!« � W � V � W {w� W ��� Ö T0���WhXF[FZFWq} Ö�: WYZ � ]_Xb�W �Ó� Wh®h�]_©!XMTRV�WY® ¬ T ¬ ]�­!XFWÞF© � ] Ü ©�X��T ¬ W3X�©!] � W�]_XF[F] � Z�W ¬ W � WYZ�] ¬ [FW l ó��Ã7�: cDTÔ����WYXF[FZ�W � ©!Z � ZFXFWM\ T �Ó� W�[FW P!P � c �à WyO�©!« � W � V � WoWj�BP!P ó c S à WyO � ©!Z � ZFXFW;\^T �Ó� WBT0���WhXF[FZFW ÖF: W � «sT�XF[�W � ]_X�� �Y� ]�WYZ � W?V!W � �WBWj�Wji=� �h� ]_WYZ � WDÒ�T�ZFXFW � W �F���h� WYXb��WYXb� � W �Ó� Wh®h��]_V!Wh\^WhXb�?ZFX � ®YT � �H[�¨�PoWh�?a σT�Z���©!Z � [�W ¬ TV�T ¬ WYZ �®YWhX�� � T ¬ WTÔ����WYXF[�ZFW Ö

[FWoPRl!c�l k aÔk!k!k]cÔWh�D®YZF\�Z ¬�� Z�XFW ¬ ZF\Ø]�XF© � ]_� � ]_X�� � ­ �Ó� W2[FW8a Ö ó � « −1 Ö!: W � [F©!XFX � W �K� Wh®YZFWh] ¬_¬ ] �©!Xb� � W � \^]��Ä[�¨ Wji4® ¬ Z � WHZFX m ]_­!­ � [�W�\ T ��� WH]�X�Ú �h� ]�WhZ � W k P!P �FÖ��oà WyO k l ó��¤7�: cÔWh� ¬ T ¬ ]_\^]��WTÔ����WYXF[�ZFW � ��TÔ]_�2[FWØP!P ó=Ö S à WyOÕô�PRQ"õpcFV�©!] � AF­!Z � W P Ö���ÖA X¹a�k!k�l ¬ T ®h©!\'«F]_XsT�] � ©!X�[FW � Wji �á�Y� ]_WYXF®hW � @�� Wh� 7�@B5 T�Z < WjVÔTÔ� � ©!X!c�]�XF® ¬ ZsTÔX��;a�cØT�XsT 㬠` � W � [F]Dn �Y� WYXb�W � Wj�DZFXFW ¬ ZF\Ø]�X�© � ]�� � ]_Xb� � ­ ��� W2VÔT � ] T�Xb�fWhX�� � W;a Ö P8Wj� ó4Ö�� Ú « −1 � W ¬ ©!X ¬ W2® T�XsT ¬®Y©!X � ]�[ �Y��� c kÕ� W � \^]��;[�¨ Wji4® ¬ Z � WUZFX m ]�­�­ � [FW�\ T �Ó� WU®h©!\ ��� ] � W�WhX�� � W3PRQ�S à WyO � \

H�PRQ!Q à WyO k l ó�� 7�: c ¬ W ��¬ ]_\^]��W � TÔ����WYXF[FZ�W ��� ©!Xb�'®h©!\ ��� ] � W � WYXb� � WEP ó l à WyO � N

H�PRQ!c à WyOXcFV�©!] � As­ Ö P Ö ó ô P ô õ�ô PRc"õ Ö

ös÷6�·÷1� �Z�����'ý]üN�¼���]���ÿ�i�w� L ýM�� U���â�'üN�.�����.�����±ý��5�7�]���: W �e� WY®�ÞFW � ®�ÞFW � [F] � WY®j�W �e� WYZ�V�WYXb�£rj� � W�®h©!\ ��¬�� � � W � W C ® T�®hWY\ØWYXb�BT V�WY® ¬ W �?� Wh®�ÞFW � ®�ÞFW �]�XF[�] � Wh®h� � Ö?7 W � [FW � XF]_ß � W � «FT ��� W � Z4�] ¬ ] � WYXb�3[FW �E� T � T�\Øßh� � W �+�Y¬ WY®j� � © ã ÚwT�]_« ¬ W �Õ� W ¬ ] �h�Ík ¬ T\ T ��� W?[FZ m ]_­!­ � cb®h©!\Ø\^W ¬ To\^T ��� We[�Z «á© � ©!X W

©!ZØ®YW ¬�¬ W?[FZ � ZsT � ä'��© � Ö=: W � \^W � Z � W � [FW�F��� ®Y] � ]�©�X ��Y¬ Wh®h� � © ã ÚwT�]�« ¬ W �B� W �Ó� W �Ó� WhX���[FW �F¬ Z � WhX �F¬ Z �¬ W � ®h©!Xb� � TÔ]�Xb�W ��� Z ��¬ T3\ T �Ó� WØ[FZm ]_­!­ � c4Wh� � W � \ØWh�Ó�WhX��8[F©�XF®[FW­!ZF]�[�W �2¬ W �2� Wh®�ÞFW � ®�ÞFW � [�] � Wh®h��W � cFV�©!] � AF­!Z � W P Ö Q Ö: T;®Y©!\�«F]�XsTÔ] � ©�X�[FW�®hW � \ØW � Z � W � TRV�WY®2®hW ¬�¬ W � [�¨ TÔZ�� � W �f� T � T�\Øßh� � W �Í�Y¬ Wh®h� � © ã ÚwT�]�« ¬ W � ®Y©!\Ø\ØW

PRc

Page 20: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

1

10

100 110 120 130 140 150 160 170 180 190 200

1

10

mH(GeV/c2)

95%

CL

Lim

it/SM

Tevatron Run II Preliminary, L=2.0-5.4 fb-1

ExpectedObserved±1σ Expected±2σ Expected

LEP Exclusion TevatronExclusion

SM=1

November 6, 2009

{|~}w� P Ö ó � : ]�\Ø]_��W �D� Z �2¬ T � Wh®h�]_©!X3W C ®YT�®YW[FW �F� ©4[�ZF®h��]�©!X3[FZ+«á© � ©�X3[FW m ]_­!­ � ©!«4�WYX�ZFW �� T ��¬ Te®h©!\'«F]_XsT�] � ©!X�[�W � Wji �á�Y� ]�WYX�®YW � [�Z < WjV�T0� � ©�X!c�ZFXU®h© ¬�¬ ] � ]�©!XFX�WYZ � pp T V!WY®2Z�XFW � X�W � ­�]�WT�Z+®YWYXb� � W�[FW\ T �Ó� W[FW P Ö l!c < WyO Ö�: T ¬ ]�­!X�W;� � T�]_� ��¬ WY]_X {w� ©!]�Xb��] ¬�¬_� Wq}DXF©!] � WKc � W �F���h� WYXb��W ¬ T¬ ]�\Ø]_��W�©�« � W � V � W { TÔ����WYXF[FZ�W§}BWYX ZFXF]�� � [FW ¬ T � WY®j�]�©�X�W C ®YT�®YW [FZ CFN�Ö�: W � «sTÔXF[FW � V�W � ��WWh��Ò�T�ZFX�W � W �F�Ó�Y� WYXb�WhX��;ZFX � ®YT � �8[FWUPWh�;a σ

T�Z���©!Z � [FW ¬ T�V�T ¬ WYZ � XF©!\Ø]�XsT ¬ W;[FW ¬ T ¬ ]�\Ø]_��WTÔ����WYXF[FZ�W Ö=: T � T � �]_W2[FW �D¬ ]_­!XFW � WYX^� � T�]�� �F¬ Wh]�X {w� ©!]_X���] ¬_¬�� } XF©!] � W � ©�Z �L¬ TBV�T ¬ WYZ � P^cb®�¨ W � � ã.k�ã[F] � WBWYXb� � WUPRQ!S à WyOïWh�P Q!Q à WyO { P ó l à WyO Wj�oPRQ!c à WyOm}L[ � �W � \Ø]�XFW ¬ T ��� ­!]�©�XÕ[FWo\^T ��� W[FZ m ]�­!­ � Wji4® ¬ ZFW�©!« � W � V � W { TÔ�Ó�WYX�[FZFW§} k l ó�� 7�:KÖ

¬ W � \ØW � Z � W � [FW ¬ T\ T �Ó� WeWh�L[FW ¬ T ¬ T � ­�WYZ � [FZÕ«á© � ©!X Z0 � T � Wji4WY\ �F¬ W � W � \^Wj���WhXb��[�¨ªT�ZF­ ã\^WhX���W ��¬ W � ®h©!Xb� � T�]�Xb�W � Ö Ý ©�Z � ®hW ¬ T�©!X T�ÒÓZ � �WØ[FW � V�T ¬ WYZ ��� \^W � Z �Ó� W � Wh���Þ � © � ] � ZFW � [ ��ã� WhXF[sT�Xb�f[FW ¬ Te\^T ��� W2[FZ m ]_­!­ � cÔWj�f©!XU®�ÞFW � ®�ÞFW ¬ WL\^Wh] ¬_¬ WYZ � TRÒÓZ � ��WY\ØWYXb�qc!®Ô¨ªW � � ã.k0ã [F] � WH®YW ¬ ZF]� Z�]Í[F©�XFXFW ¬ W �F¬ Z �8� Wh�]�� χ2 csV�©!] � As­ Ö P Ö ô4Öá: W�\Ø]�XF]_\'ZF\ [FW�®hWh����W�Ú ©!X�®h�]_©!X {w¬ T \^T ��� W ¬ T�F¬ Z �f��� ©!«sTÔ« ¬ W2[FZØ«á© � ©!XØ[FW m ]_­!­ � } � W?� � ©!Z�V!W k ô Q +33

−24

à WyO k Q!c � 7�:fÖ�@ W �F¬ Z �f¬ T ¬ ]�\Ø]_��W� Z �á�Y� ]�WYZ � W k l ó"� [FW 7�: ® T ¬ ®YZ ¬�� W � ©�Z � χ2 F a Ö ô �F� WhV�©!]_�oZ�X m ]�­!­ � [FW'\^T �Ó� WU\

H .PRl!k à WyOlc ¬ W m ]�­!­ �f¬_� ­!W � W � �H[F©�XF®2ÚwTRV�© � ] ��� Ö4J ©��©�X �s� Z�We®hW �D¬ ]�\Ø]_��WL©�X�� � � �8� ��TÔ« ¬ ]_W � [sT�X �¬ WB®YT�[ � W � � � ]�®h��Wo[FZ CFN�Öá7 Wj���W­bTÔ\^\ØW;[FWo\^T �Ó� W �?� W ¬ T0�]_V�WY\ØWYXb�2«sT ��� W �H{ PRk!k à WyO ã PRl�kà WyO�}�W � � T�®h®YW �Ó� ]_« ¬ W T�Z < WhVÔTÔ� � ©!X!cÍ®Y©!\Ø\^W V=Z �F��� ® � [FWY\Ø\^WhXb�qc�Wj�'©!X ®h©!\ �F� WhXF[Ñ[F©!X�®¬ ¨ ]�\ � © � ��T�X�®YW;[�W ¬ T � Wh®�ÞFW � ®�ÞFW�[FZ m ]_­!­ �2¬_� ­!W � [sT�X � ®YW � W�i � W � ]�WhXF®YW � Ö

PRl

Page 21: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

ös÷6�·÷�� � ý��w�Qú�����.�s� �i��� L ���.�â� L VJý�ü:���.�����Qú�SU��VNVs�\ü�ú ���;üJ��ý]���: T �F� ©4[FZ�®h�]_©!XØ[FZ m ]_­!­ ��k «sT ��� W;\^T ��� W { ®�¨ W � � ã.k�ã [F] � W N

H� PRS ó�à WyO�}KTÔZ < WhVÔTÔ� � ©!X

���h� Z ¬ �W�[FW�[FWhZ4i �F� ]_XF®Y] � T�Z4i�\ � ®YT�XF] � \^W � | ¬ T �F� ©4[FZ�®h�]_©!XE[�] � Wh®h� � T � Ú Z � ]_©!XE[FW�­ ¬ Z�©!X � cWh� ¬ T �F� ©=[FZF®j�]_©!X T ��� ©4®h] � W k Z�XØ«á© � ©!X W©!Z

Z { ©!Z m ]_­!­ ��� � � T�Þ ¬ Z�XF­g}fc0V!©!] � As­!Z � WoP Ö c Ö!: T�F� ©=[FZF®j�]_©!X [F] � Wh®h� � T � Ú Z � ]�©�X [FWe­ ¬ ZF©�X � [F©�\^]_XFWdcb\^T�] � ®YWe® T�XFT ¬ W � �2[�] C ®Y] ¬ W k \^TD!�� � ] � W �k «sT �Ó� W \ T �Ó� W¹®YT �3¬ W¹« � ZF]_�Õ[FW¹Ú ©!XF[ N 7�@ W � �+� � © � ]�\ � © � ��TÔX�� ÖL6 «sT ��� W#\^T ��� Wdc ¬ T� Wh®�ÞFW � ®�ÞFW [FZ m ]�­!­ � TÔZ < WhVÔTÔ� � ©!X � WUÚwT�]��o[F©!X�®ØW ��� WYXb�]_W ¬�¬ WY\ØWYXb��[sT�X �¬ W � ® TÔXsT�Z4i#©dz ¬ Wm ]_­!­ � W � � �F� ©4[�ZF]_��WYXÑT ��� ©4®h] TÔ��]�©!X T V!Wh®ÕZFX «á© � ©!X W

©!ZZÖg: TvAs­�Z � W�P Ö l�\^©�X�� � W ¬ W �[F] TÔ­ � T�\Ø\ØW � [FW 5 Wh`=XF\^T�X [FW � � � ©!] �o�F� ]�XF®h] � TÔZ4i#® TÔXsT�Z4i � �ZF[F] �Y� T�Z < WjVÔTÔ� � ©!X k «sT �Ó� W\ T ��� W Ö�: ¨ªT V�TÔX��T�­!WØ[FZÑ®YT�XsT ¬ ZH → l+l−bb � T ��� T ��� © � ��T�ZÑ® TÔXsT�Z4i ZH → ννbb

Wj�WH → lνbb

c � ZF]�®Y©�X���]�WhXFXFWYXb�HZFX^©�Z �F¬ Z � ]_WYZ �Ó� X�WYZ�� � ]�X�© {w� }f[�] C ®Y] ¬ WY\ØWYXb�K[ � �Wh®h��TÔ« ¬ W {w� }@cW � � � ZFW ¬ WH«á© � ©!X Z � W2[ �h� ]_X���ßY­ � W2WYX [FWhZ4i ¬ W � ��©!X �·{ �Y¬ Wh®h� � ©!X � ©�ZU\'ZF©!X � } � ZF] �F� ©4[�ZF] � WYXb�ZFX � ]_­!XsT ¬ ® ¬ T�] � Wh�?ÚwT�®h] ¬ W k ]�[FWhX���]DAsW � Öös÷6�·÷3� % üUý��5� J �!ýM� J ���Qú�SU��VNVs����üs�Q���.�R�iüs��ü��

ZH → e+e−bb7 ©!\^\ØW?V4Z �F��� ® � [�WY\Ø\^WhX��c ¬ We®YT�XsT ¬ ZH

W � � ¬ ¨ªZ�X [FW � ® T�XFT�Z4i ¬ W �F¬ Z �D� WhX � ]_« ¬ W � ©�Z �¬ T � WY®�ÞFW � ®�ÞFW^[FZ m ]�­!­ �mk «FT ��� W^\^T ��� W { N

H� PRS ó+à WyO�}fc�Wj� � T � ®Y©�X ���~� Z�WYXb� ¬ WU® T�XsT ¬

� T � �]�®hZ ¬ ]_W � ZH → e+e−bbc � ZF]~W � � ¬ W � Z0ÒÓWh��[FW � Wh®�ÞFW � ®�ÞFWo[FWB®hWh�Ó�We��ÞFß � W � cFW � �2[F©!XF®e� � ß �]�\ � © � ��TÔX�� � ©�Z �2¬ T � Wh®�ÞFW � ®�ÞFW�[�Z m ]�­!­ � T�Z < WhVÔTÔ� � ©!X Ö@ WEX�©!\'« � WYZ4i �F� ©=®YW ��� Z �Õ� Þb` � ] � Z�W �3�F�Ó�Y� WhXb�WYXb� ¬ T�\MrY\ØW���© � © ¬ ©!­!]_W|AsXsT ¬ W � ZFWEXF©�� � W

� ]_­!XsT ¬ c � ©!]_�2[�WYZ4i �h¬ Wh®h� � ©!X � Wj�?[FWYZ4i'ÒÓWj� � [FW � ZsT � äÕ«!c�Wh�?®Y©�X � ��]_�Z�WYXb�8ZFX+]�\Ø\^WhX � WB« � ZF]��[FW;Ú ©!X�[ � ©�Z � XF©Ô� � WBT�XsT ¬ ` � W Ö�7 W � « � ZF]_� � [FWeÚ ©!XF[ � ©�X���[FW ��� W ¬_� [ � A�� ��� ©!Z �L¬ T � WY®�ÞFW � ®�ÞFW[FZ m ]_­!­ � [sT�X �o¬ W � ®h© ¬�¬ ] � ]_©!X � ÞsT�[ � ©!XF] � Z�W � Ö�: W � « � ZF]_� � [FW'Ú ©!XF[¹[�©!\^]_XsT�Xb� ��� ©RV=]�WYX�XFWYXb�[FW[F]Dn �Y� WYXb� �?�F� ©4®hW �Ó� Z �8� ZF]�VÔT�Xb� ¬ WoXF]_V�W T�Z+[FW ¬ ¨ T�XFT ¬ ` � WKc { ®jÚ Öáô4Ö S�} Ö

ð Ð�� ¢è¸�º�±L¥Y¶+§ ½h¸�º: W N ©=[Fß ¬ W C ��TÔXF[sT � [�[FW ¬ T � Þb` � ] � Z�W�[FW �E� T � �]_®YZ ¬ W �Y� ZF] � W � \ØWh��[FW [ � ® � ] � W ¬ W �Ú W � \^]_©!X � T�]�X � ] � ZFW ¬ WYZ �Ó� ]_X���W � T�®h��]�©!X � W � �ÕZFX � ZF®h®Yß � [FW � Z�] � [FWEXF©�\'« � WhZ � W � T�XFX � W � c®YW � WhXF[sT�Xb�qc�] ¬ X�¨ Wji �F¬ ] � ZFW � T �¬ ¨ © � ]_­!]�XFW�[FW ¬ T3\ T ��� W [FW ��� T � ��]�®YZ ¬ W � Ö : W^\ � ®YT�XF] � \ØWU[FWm ]_­!­ ��� W � \^Wj�K[FW ���h� ©!Z�[ � W?®YW ��� ©!« ¬ ßY\ØW�WYX ]_X�� � ©=[FZF] � T�Xb�fZFX XF©�Z�V!WYT�Z^®�ÞFT�\ �#� ZF]F­ � XFß � W

¬ T \^T ��� W�[FW � «á© � ©�X � Wj�E[�W � Ú W � \Ø]�©!X � Ö87 ©!\Ø\^W k �©!Z4�E®�ÞsTÔ\ � c?©!X ¬ ZF]T ��� ©=®Y]_W#ZFXFW� T � �]�®hZ ¬ WKc ¬ W�«�© � ©!X�[FW m ]�­�­ � c � ZF];X~¨ T � T � WYX�®Y© � W � � � [ � ®h©!Z�V�W � � k ®YWØÒÓ©�Z � ÖL: W CFNXFW;Ú ©!Z � XF] ��� TÔX���T�ZF®hZFXFWo]�X�[F]�®YTÔ�]_©!X � Z ��� T'\ T �Ó� WKc�[FW � Wji �á�Y� ]_WYXF®hW � [F] � Wh®h�W � Wh��]�XF[F] � Wh®h�W �� W � \ØWh�Ó�WYXb�e®YW � WhXF[sT�Xb�o[FW ��� [FZF] � W ¬ W � [F©!\^T�]�X�W � [FW � WY®�ÞFW � ®�ÞFW � Wh�eÚwTRV�© � ] � WhX��eZFX m ]�­!­ �[FW'\^T ��� W ¬�� ­!W � Ö~A X]AFX!c ¬ W�® T�XsT ¬ ZH → e+e−bb

W � �o� � ß � ]�\ � © � �T�Xb� � ©!Z �;¬ T � WY®�ÞFW � ®�ÞFW[FZ m ]_­!­ �·k «sT �Ó� W�\ T �Ó� W�T�Z < WhVÔTÔ� � ©!X Ö

a�k

Page 22: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

{|~}w� P Ö Q�� N T ��� W�[FZ�«á© � ©!X+â WhX�Ú ©�XF®h��]�©!X+[FW ¬ TU\^T ��� W[FZ � ZsT � äÕ�© � Ö�: W�®h©!Xb�©!Z � WhX� ©!]_Xb�] ¬_¬�� W � � ¬ T+®Y©!Xb� � T�]_X���W � © �Ó� W � T � [FW � \^W � Z � W � [F] � WY®h��W � T�Z :�A Ý Wh��T�Z < WhVÔTÔ� � ©!X��¬ W;®h©!Xb�©!Z � WYXÕ� � T�]�� �F¬ WY]_X � W �F���h� WhX���W ¬ W � ®Y©!Xb� � T�]_X���W ��� © �Ó� W �2� T � [FW � \^W � Z � W � ]_XF[F] � WY®j�W ���� T ¬ ] �Ó� W �B� T �o¬ W � ®Y© ¬�¬ TÔ«�© � TÔ�]_©!X � :�A Ý Wh� C�:�@�Ö�: W � [FWYZ4i ®Y©!Xb��©!Z ���� ©!Xb� � ��TÔ« ¬ ] ��k Q!c �[FWeX�]_V!WYT�ZÕ[FW8®Y©�X]A�T�XF®hW Ö�: T«sT�X�[FW;Wj� ¬ W � ®�ÞF]Dn � W �H� Z � ]�\ � © ���h� ]_XF[F] � ZFW ¬ T � W ¬ T0�]�©�X^[FW8®YW �[FWYZ4i3\ T �Ó� W �Qk ®YW ¬�¬ Wo[FZM«á© � ©!X+[FW m ]�­�­ � Ö

a4P

Page 23: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

{|~}w� P Ö ô � 7 ©!Z � «áWL[FW ∆χ2 c � W �F�Ó�Y� WYXb�W ¬ T2[F]Dn �Y� WYXF®hWHWYXb� � W ¬ W χ2 \^]_XF]�\^T ¬ Wh� ¬ W χ2 ©!«4�WYX�ZWYX#ÚwT�] � T�Xb�oVÔT � ]_W �¬ T3\^T ��� WØ[�Z m ]�­!­ � ®h©!\^\ØWUZFX � T � T�\^ßj� � W Ö�: W \^]_XF]�\'Z�\ ]_XF[F] � ZFW ¬ T\ T ��� W ¬ T �F¬ Z �B�F� ©!«sT�« ¬ Wdc � ©!]�� ô Q à WyO Ö�: T3«sT�X�[FWU« ¬ WhZFW � ZF]ÄWhX���©!Z � W ¬ T ¬ ]_­!XFW�XF©!] � W�W � �¬ ¨ W �Ó� WYZ � �Þ � © � ] � ZFW Ö�: T^­ � T�X�[FW'«sT�X�[FWeÒ�T�ZFXFW�ÞF© � ] Ü ©!Xb�T ¬àk ­!T�ZF®�ÞFWUWj� ¬ T � Wh��]_��W k [ � ©!]_��W{ W�i�® ¬ ZF[�WY[7} � W �F���h� WYXb��W ¬ T Ü ©�XFW[FW�\^T �Ó� W�Wji4® ¬ ZFW k l ó��Î7�: � T �?¬ W :�A Ý Wh� ¬ W < WhVÔTÔ� � ©!X� W ��� WY®h��]_V�WY\ØWYXb� Ö

a!a

Page 24: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

{|~}w� P Ö cw� C Wh®h��]�©!X'W C ® T�®hW�[FW �F� ©4[�ZF®h��]�©!X�[FZ m ]_­!­ � T�Z < WhVÔTÔ� � ©!X � ©!Z � [F]Dn �Y� WYXb� � \^©=[FW �[FW �F� ©=[FZF®j�]�©�X { T�}fc TÔ]�X � ] � Z�W ¬ W � T �F� © � ��[�WØ« � T�XF®�Þ�WY\ØWYXb��[�W � ® T�XsTÔZ4i [FWØ[ �Y� ]�Xb� � ­ � T ã�]�©�X { «7}fc�WYXØÚ ©!XF®j�]�©�X^[FW � T�\ T ��� W Ö�: T«sT�XF[�WKÒ�T�ZFX�W k ­bT�ZF®�Þ�W;]�X�[F] � ZFW ¬ T Ü ©�XFW;[FW8\^T ��� WWji4® ¬ ZFW � T �?¬ W :�A Ý � ¬ TU«sT�X�[FW[FZE\Ø] ¬ ]�WYZ {w� ©�ZF­!W§}@csWh�e®YW ¬�¬ Wo[�W�[ � ©!]_��W { « ¬ WYZFWq}fcs]_XF[F] � ZFWhXb�¬ W � Ü ©!XFW � [sT�X �ج W �T� ZFW ¬�¬ W �^¬ T �F� ©=[FZF®j�]�©�X-T �Ó� ©=®Y] � W�Wh� ¬ T �F� ©=[FZF®j�]�©�X,[F] � Wh®h�W � W ��� WY®j�] ãV!WY\ØWYXb�c�T �F� © � ��WYXb� ¬ T \^T�ÒÓ© � ]_� � [FW ¬ T � WYX � ]�«�] ¬ ]�� � Ö n X V!©!]�� � ­bT ¬ WY\ØWYXb� � ZFW ¬ W'\^©=[FW'[�W[ �Y� ]�Xb� � ­ � TÔ��]�©!X+[FZ m ]�­!­ � WhX bb

[F©�\^]_XFWDÒÓZ �ø� Z~¨ k PRS ó à WyO Ö

{|~}w� P Ö l�� @ ]�T�­ � T�\^\ØW � [FW 5 Wj`4X�\ T�X�[FW � � � ©!] �8��� ]�X�®Y] � T�Z4i3®YT�XsT�Z=iMT�XsT ¬ ` �Ó�Y� T�Z < WjV�T ã� � ©�X k «FT ��� W�\^T �Ó� Wdc NH� PRS ó à WyO | k ­bT�Z�®�ÞFW ZH → l+l−bb

cFT�Z+\^] ¬ ]�WhZ ZH → ννbbc

Wh� k [ � ©!]��W WH → lνbbÖ

a�S

Page 25: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

� � æ �¾ðáî�ò�ê �

� ð ì|� u ì3ðáîMð�� ê�� � � òMð í ê�a îMæ¤é

�Z�s�â�'���â�'�Â��Ç� �%�2È"�'Ë��i�Ç�.�7�M���  �È�È"ÅK�ÇÅ�¢ ^�fÆÇ�'¡5�*������¢qËvÆ��Ç �Ê �£�£���£�£���Q�£���îÂgì

¹^¦¨¥§¦¨¥ ç�¯.µK¿^­g½�²±»Fµq¶<¿�ª�«s´�¯.µq².µq¶g« ¦h¦·¦e¦h¦·¦h¦·¦h¦·¦·¦h¦e¦h¦·¦h¦·¦·¦h¦ ¹?�¹^¦¨¥§¦º¹ ç�¯.µK¿^­g½�²±»Fµq¶<¿�ª�«â®¶�²±»¨´�¯.µq².µq¶g«x¦e¦h¦·¦h¦·¦h¦·¦·¦h¦e¦h¦·¦h¦·¦·¦h¦ ¹?�¹^¦¨¥§¦ºÞ ©7ªhѪ�觮²±¯.µq¶�¦h¦e¦h¦·¦·¦h¦·¦h¦·¦e¦h¦·¦h¦·¦h¦·¦·¦h¦e¦h¦·¦h¦·¦·¦h¦ ¹"á

Â��F �%�2�*Å��@��ȧ�@�dÚ¢ ��¡ �£�£���£�Q���£�£���£�£�Q���£�£���£�£���Q�£��� Ù'ï¹^¦º¹^¦¨¥ ©®�¢@µq¶gª·¿�ª�«s½�µq³¨³¨»F«±»Fµq¶g«û¦h¦·¦h¦·¦e¦h¦·¦h¦·¦h¦·¦·¦h¦e¦h¦·¦h¦·¦·¦h¦ Þ§ê¹^¦º¹^¦º¹ ©®Q³¨­�À�»¨¶gµ§«±»¨².Óÿ¦e¦h¦·¦·¦h¦·¦h¦·¦e¦h¦·¦h¦·¦h¦·¦·¦h¦e¦h¦·¦h¦·¦·¦h¦ Þ§¹¹^¦º¹^¦ºÞ ©7ª�«s«.µq­g«�£�¿�Ó�².ª�½�².ª�­�¯.«<¦·¦h¦·¦h¦·¦e¦h¦·¦h¦·¦h¦·¦·¦h¦e¦h¦·¦h¦·¦·¦h¦ Þæ¹^¦º¹^¦ æ ©7ªh«'¤^«±²�¥�Àmªh¿�ª·¿�Ó�½�³Fª�¶g½.Ògª�Àmª�¶K²V¦h¦·¦h¦·¦h¦·¦·¦h¦e¦h¦·¦h¦·¦·¦h¦ ë^¥¹^¦º¹^¦ºë ¦�ª�½�µq¶g«±²±¯±­g½�²±»Fµq¶M¿�ª�«�Ó�è�¥�¶gª�Àmª�¶�².«ûª�²J¾�µq¯±À ®²â¿�ª�«s¿�µq¶�¶gÓ�ª�« ¦h¦ ë§Þ

Â��¨Ù íe�'¡*È���ÚÌ~ÆD�]¡2���£�Q�£���£�£���£�Q���£�£���£�£�Q���£�£���£�£���Q�£���¨§gì

7 W3®�ÞsT � ]�� � W3W � � ®h©!X � TÔ® ��� T�Z [F] ��� © � ]��]�Ú2Wji �á�Y� ]_\^WhXb��T ¬ [FZ < WjV�T0� � ©�X Öf: W3®Y©!\ �F¬ Wji4W[�¨ªT�®Y® �Y¬��h� TÔ��]�©!X^T�Z d ZFX G�G W � � �����Y� WYXb� � [sT�X �L¬ T �F� Wh\^]_ß � W � WY®h��]�©!Xic ¬ W8[ � �Wh®h��WYZ � @£� T V�WY®� ©!X � ` � �ßh\^W?[FWH[ � ® ¬ WYX�®�ÞFWY\ØWYXb�LT�]�X � ] � ZFW ¬ ¨ � ��T � W�[FW ¬ T � Wh®Y©!X � � � ZF®h��]�©!X � [FW �f� V!ßYX�WY\ØWYXb� �� ©!Xb�8[ � ® � ] � [sT�X �?¬ T'[�WYZ4i4]�ßh\^W � WY®h��]�©!X Ö

GØÐ ð ñ �ƱL¸�Á ¦+¥j�j©Õ�¼´�ªI£�±�±HÉ2¥jÉ�³Ä£o��½h¸�º ´3�¬« ��³�Á ½j¥Y£·: W ®h©!\ ��¬ Wji4W [�¨ªT�®Y® �Y¬_�Y� T0�]�©�X [�W 5 W � \^] ¬ T�«E©!Z 5�Je6B: { 5 W � \^] J TÔ�]_©!XsT ¬ 6 ®Y®YW ¬ W � TÔ��© �: T�«�© � TÔ��© � `]}|ô PRl�õ&c � ]��Z � [sT�X �^¬ T#«FT�X ¬ ]_WYZFW n ZFW � �^[FW 7 ÞF]�®YT�­!©�T�Z4i 9;C46 c � W�®h©!\ � © � W[�¨ ZFX WYX � WY\'« ¬ W [~¨ T�®h® �h¬��Y� TÔ�WhZ ���U¬ ]�X � T�] � W Wh�U®h] � ®hZ ¬ TÔ] � W { V!©!] � As­ Ö a Ö P"} ÖÍ: W < WhVÔTÔ� � ©!XÑW � �

¬ W�[FW � XF]�W � \ TÔ] ¬�¬ ©!X+[FW ¬ T ®�ÞsTD!�XFWdc~TRV�WY® ZFXFW�®Y] � ®Y©!X4Ú �Y� WhXF®YWU[�W Q Ö S^ä=\vc~] ¬ ®h© ¬�¬ ] � ]�©!XFX�W�[�W ��F� ©Ô�©!X � Wj��[�W � TÔX���] �F� ©��©�X � T�Z ®hWYXb� � W^[�W � [ � ��WY®h��WYZ �Ó� @�� Wj� 7�@;5 cgTRV�WY®ØZFXFW � XFW � ­!]_WT�ZÕ®hWYXb� � WB[FWB\^T ��� WB[FW�P Ö l�Q < WyO ÖF: W < WhVÔTÔ� � ©!XÕW � �?TÔ]�X � ]pc=T �F� ß ��¬ W :�mB7 { : T � ­!W m T�[ � ©!X7 © ¬�¬ ]�[FW � }H[FZ 7�AKd8J ôªa�kKõ � ]��Z �lk à WYXFßjV!Wdc ¬ W�[FWYZ4i4]_ßY\ØW �F¬ Z �;� Z�] ��� T�Xb�o®Y© ¬�¬ ] � ]_©!XFXFWhZ � T�Z\^©�XF[FW Ö

a �

Page 26: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

{|~}w� a Ö P � : W ��� �T � W ��� ZF®Y®hW �Ó� ]_V�W � [�W �F� ©4[�ZF®h��]�©!X Wh��[�¨ªT�®Y® �Y¬��h� TÔ��]�©!X#[FW � ÚwT�] � ®hW T�Z4i#T�Z< WjV�T0� � ©�X � ©!Z �?¬ W d Z�X GÓG�Ö Ý ©!Z �e¬ W �?�F� ©��©�X � | ¬ W �����jã T�®Y® �Y¬_�Y� T0�WYZ � 7 ©=®�ä � ©�Ú{� ã â T ¬ ��©!X!c ¬ W: ]_XsT�®Kc ¬ W × ©=© � �W �e� ZF] �;¬ ¨ ]�X�ÒÓWY®h��WYZ �e�F� ]_XF®Y] � T ¬ Wh� ¬ W < WjVÔTÔ� � ©!X Ö Ý ©!Z �B¬ W � T�Xb�] ��� ©���©!X � | ¬ T� ©!Z � ®YW8[�¨ªT�Xb�] ��� ©���©!X � T V!WY®eZFXFW � �TÔ�]_©!X ã ®h]�« ¬ Wdc ¬ W � T�X�XFW T�Z=i [�WY«FZFX�®�ÞFW � Wh�HT�®Y®hZF\'Z ¬ TÔ�WhZ � c� ZF] �2¬ ¨ª]_X0ÒÓWY®j�WhZ �2�F� ]_XF®Y] � T ¬ Wh� ¬ W < WhVÔTÔ� � ©!X Ö

a ó

Page 27: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

�ä÷øös÷¼ö � ý��w�Qú�����.�s�­�Q���®��ý��:�'�s�Q�: T �F� ©4[FZ�®h�]_©!X�Wh� ¬ ¨ªT�®Y® �Y¬��h� TÔ��]�©!Xo[~¨ªZFX�ÚwT�] � ®YW TÔZ�[FW �F� ©��©!X � X � ®YW ��� ]��W �F¬ Z � ]�WhZ ����� �T � W �[ � ® � ]��W � ®h] ã [�W ��� ©!Z � |

• ¬ ¨ T�®h® �h¬��Y� TÔ�WhZ �B�h¬ WY®j� � © � �TÔ�] � Z�W ��ü!+.¯+!÷�ü7��ùY�+° õ��{ùRü� W � � ¬ T �F� Wh\^]_ß � W � �T � WU[�¨ TÔ® ã® �Y¬��h� TÔ��]�©!X�[FZ�ÚwT�] � ®hW T�Z'[~¨ª]_©!X � Þb`=[ � ©!­!ßYX�W�X � ­!TÔ�]�Ú � m − c ke� T � ��] � [FZ � ZFW ¬�¬ W ���F� ©��©�X �� ©!Xb� ��� ©=[FZF]_� � Öb@ ¨ T�«á© � [^[FW � TÔ�©!\ØW � [~¨ªÞb`=[ � ©�­!ßYXFW m � ©�X�� �F¬ ©!XF­ �h� [sT�X � ZFXØ®�ÞsT�\ ��h¬ WY®j� � ] � ZFW � ZF]FVÔT ¬ W � ]_©!XF] � W � c�®hÚ Ö AF­ Ö a Ö a Öb: W �K�F� ©��©�X � ® ���h�Y� V!©!Xb� � ¨ªT�­!­ ¬ ©!\ �Y� W �Ä� Z �ZFX�W �Y¬ WY®h� � ©=[FW�X � ­bTÔ��]_V�W�WYXE® �Y� ]�ZF\vcá[�¨ª©dz ] ¬_�e� W � ©�X��BWYX ¬ WhV �h�B� T �e¬ W �;�F� ©��©!X � ]�X�®Y] ã[FWhXb� �B� ZF]_VÔT�Xb� � Ö�7 ©�\^\ØW ¬ ¨ � XFW � ­!]�W�[FW ¬ ] TÔ] � ©�X�[�W �;�h¬ Wh®h� � ©!X � [FZ ® �h� ]_ZF\ W � �eÚwT�]�« ¬ Wdc¬ W �F� ©���©!X � W � T � �DT V�WY®8[FWYZ4i �Y¬ Wh®h� � ©!X �f� ©!Z � Ú © � \^W2[�¨ ]�©�X m − Ö�7 W � [�W � X�]�W �Ó� \^]_­ � WhXb�[sTÔX � ZFXFWB®h© ¬ ©�XFXFW;[�W 7 ©4®�äÔ® � ©ÔÚ{� ã â T ¬ �©!X � ©!Z � rh� � WoT�®h® �h¬��Y�Ó�Y� ÒÓZ �ø� Z�¨ k ZFX�W � XFW � ­!]_W[FW ô!ó k�ÙWyOlc k�¬ ¨ªT�]�[�W8[~¨ªZFX � ` � ��ßY\ØWB[FW;®h©!XF[FWhX � T0�WYZ ��� c4®hÚ Ö As­ Ö a Ö S Ö4A X'AsX!c ¬ W � ]�©!X �m − [FW ô!ó kØÙoWyO � ©�X��8[F] � ]_­ �Y� V�W �Ó�e¬ ¨ T�®h® �h¬��Y� TÔ�WhZ �2¬ ]_X � TÔ] � WKc ¬ W : ]�XsT�® Ö

• ¬ W WDý&��õ�+ W � �oZFX¹TÔ®Y® �h¬��h� TÔ��WYZ �B¬ ]�X � T�] � W[FW PRS�k \0c�] ¬g� W7�h©!]_� ¬ WÚwT�] � ®YW TÔZ [�¨ ]�©!X � m −] ��� Z,[FW ¬ ¨ªT�®Y® �Y¬��h� TÔ��WYZ � 7 ©=®�ä�® � ©�Ú{� ã â T ¬ ��©!X!cfWh� ¬ ¨ªT�®h® �Y¬ ß � W'ÒÓZ �T� Z�¨ k ZFXFW � X�W � ­�]�W�[FW� k�k N WyO T VÔT�Xb�8[FW ¬ Wo[F] � ]_­!W � V�W �Ó�e¬ Wo«�©=© � ��W � Ö• ¬ W � ü~ü*�jùRø�÷ W � ��Z�X � `=XF®�Þ � ©�� � ©!X�[�¨ªZ�XFW^®h] � ®Y©!X�Ú �h� WhXF®YW^[FW ��ô!ó \ Ö�6 ¬ T � © � ��]�W [FZ: ]�XFT�®dc ¬ W2ÚwT�] � ®hW T�Z^[�¨ª]_©!X � m − � � T V�W ��� WBZFXFW8Ú WYZF] ¬�¬ W2[FWe®YT � «á©!XFW8[FW8ÚwT�]�« ¬ W �Y� TÔ] ��� WYZ � c®hW � ZF]D[ � «sT ��� T ��� W ¬ W � ]_©!X � m − [�W ¬ WYZ �Ó���h¬ WY®j� � ©!X � ÖÍ: WØÚwTÔ] � ®hW T�Z�[FW �F� ©���©!X � ® �Ó�Y�W � � ��� ®YZ �á�Y�Ó�U� T �e¬ W × ©4© � �W �£� ZF] ¬ W � TÔ®Y® �h¬ ß � WeÒÓZ �ø� Z~¨ k ZFX�W � XFW � ­!]_W'[FWUc à WyO Ö�: WÚwT�] � ®hW T�Z�[FW �F� ©Ô�©!X � [�W�c à WyO W � �8WhX � ZF]��W � ��©4®�ä � [sTÔX �?¬ ¨ ]�X0ÒÓWh®h�WhZ ���F� ]�XF®h] � T ¬ Ö• ¬ ¨ ý�� ø'+�ù ø4ÿ�÷��g÷Ôý��1+bý��gõ�� W � �2ZFX � `=XF®�Þ � ©�� � ©!X+[�¨ ZFX3[F]�T�\^ßj� � W;[FWa�ä=\ | ] ¬��Ó� ®hZ � ß � WZFX�W � T � �]_WB[FW �e�F� ©��©�X �?�F� ©RV!WhXsT�Xb�e[FZ × ©4© � �W � Wh� ¬ W � TÔ®Y® �h¬ ß � WHÒÓZ �T� Z�¨ k P ó k à WyO �] ¬ TÔ®Y® �h¬ ß � W ¬ ¨ªT�Z�� � W � T � ��]�W?[FW �L�F� ©Ô�©!X � ÒÓZ �ø� Z~¨ k PRa�k à WyO Ö47 Wh�Ó�We[FW � XF]�ß � W � W � VÔT�Xb� k¬ T ÚwT�« � ]_® TÔ��]�©!X¹[�W � T�Xb�] �F� ©���©!X � c�[ � ® � ]��®Y] ã [FW �Ó� ©!Z � c ­ � ��®YW k3¬ ¨ªT�®h®YZF\'Z ¬ TÔ��WYZ � c � ZF] �] ¬ T�®h® �Y¬ ß � W ¬ WEÚwT�] � ®YWYT�Z�[�¨ªT�Xb�] ��� ©���©!X�ÒÓZ �T� Z�¨ k P ó k à WyO Ö25 ]_XsT ¬ WY\ØWYXb� ¬ ¨ª]_X0ÒÓWY®j�WYZ ��F� ]�XF®h] � T ¬ WhX�V�©!]�W ¬ W � ÚwTÔ] � ®hW T�Z=iÑ[FW �F� ©���©!X Wh�'[�¨ TÔX���] �F� ©��©�XÑ[FW P ó k à WyOÎ[sT�X �U¬ W< WhVÔTÔ� � ©!X Ö

�ä÷øös÷3� � ý��w�Qú�����.�s�­�Q���\üs�â���'�Qý]�:�]�s���: T �F� ©=[FZF®j�]_©!X�[�W � TÔX���] �F� ©��©�X ��� WLÚwTÔ]_� ke� T � �] � [FW �Í�F� ©Ô�©!X �Í�F� ©RV�WYXsT�Xb��[FW ¬ ¨ª]_X0ÒÓWY®j�WYZ �

�F� ]_XF®Y] � T ¬ c4Wj�eX � ®YW ��� ]_�W ¬ W �2� �T � W �?� ZF®h®YW �Ó� ]�V!W �;� ZF]�V�TÔX���W � |

• � õZ�hùRõ�ù�ý ü��+bý � � ø � W � \ØWh�?[FW® ��� W � [FW � T�Xb�] �F� ©Ô�©!X �äk � T � ��] � [FZ3ÚwT�] � ®hW T�Z+[FW �F� © ã��©!X � ]�XF]��]�T ¬ Wh\^WhX��;T�®h® �Y¬_�Y�Ó� [�W�PRa�k à WyO [sTÔX �¬ ¨ ]�X0ÒÓWh®h�WhZ �o�F� ]�XF®h] � T ¬ W Ö�G ¬ W � ��[F©�XF®�Ó� ®YZ ���h��� Wh�®h© ¬�¬ ] � ]_©!XFX � T V!Wh®^ZFX�WU®Y]�« ¬ W'[FW J ]�äÔW ¬ Ö~: W �o� T � �]_®YZ ¬ W � ® ���Y� W ��� ©!Xb�WhX ã� ZF]_��W�Ú ©=® T ¬ ] �Ó� W � T V!Wh®'ZFXFW ¬ WhX���] ¬_¬ WoT�Z ¬ ]��ÞF]_ZF\0c � ZF] � W ¬�¬ W �?� T ��� WYXb�B[FT�X � Z�XE®�ÞsT�\ �\^T�­!X � �] � Z�W � ZF] �Ó�Y� T � WT ¬ © ���H¬ W � TÔX���] �F� ©��©�X � [FW � T�Z�� � W �2� T � ��]�®YZ ¬ W � c=V�©!] � As­ Ö a Ö���ÖG ¬ ÚwTÔZ�� �F� ß � [�¨ ZFX \^] ¬�¬ ]_©!X[FW �F� ©��©!X � ©!Z � ® ��� W � ZFXØT�Xb��] �F� ©��©!X Ö�6 ®hW � ��TÔ[FWdc ¬ W � T�X ã��] �F� ©��©!X �L� ©!Xb��� � ß � [�] ��� W �Ó���h� WYX � XFW � ­!]�W8Wh�H[F] � WY®h��]�©!Xic=Wj��] ¬��D� W � ©!Xb��ÞF©�\^©!­ � X � ] ���h�k ¬ ¨ªT�]�[�WB[FZ�[FWY«FZ�XF®�ÞFW � Ö

• � øèögø � ÿ;�1+Ôú�ø=ÿg÷ � W � \^Wj�+[�¨ ÞF©!\Ø©!­ � X � ] � W �+¬ W ÚwTÔ] � ®hW T�Z1[�¨ªT�Xb�] �F� ©���©!X�] �Ó� Z1[FW ¬ Ta�Q

Page 28: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

{|~}w� a Ö aI� C ®�Þ � \ T [FW ¬ T'® ��� T0�]�©�X�[�W � ]�©!X � m − Ö

� �TÔ�]_©!X+®Y]�« ¬ W Ös7 ¨ªW � �eZFXETÔ®Y® �h¬��h� TÔ��WYZ � � � ] T�X�­!Z ¬ TÔ] � W � ZF] ­ � �Ô®YW kØ� TØ®YT V4]�� �� TÔ[F]�©�Ú �Ó�jã� ZFWYXF®hW�Wj� � ©!X � WjÚ � ©!]_[F] �Ó� WY\ØWYXb� � �©=®�ÞsT � ��] � ZFW<ô a=Põ VÔT � W �Ó� Wh®h�]�V!Wh\^WhX��e[F]_\^]_X=Z�W �2¬ T[F] �Ó� W ��� ]�©!X+WYX � X�W � ­�]�Wdc�Wh�8®Y© �Ó� ]_­!W �2¬ WBÚwT�] � ®YW TÔZ � T �2��� � � ©!T�®h��]�©!X!c4V!©!] � As­ Ö a Ö ó4Ö

• �¼- õ�+�+bÿ1�#ÿ;� õ�ùRø=ÿ�÷ W � �eZFXMT�XFXFWYT�Z�� � ]�T�XF­!Z ¬ T�] � W � W�� � ©!Z�VÔT�Xb�8[sT�X �8¬ Wo\<rh\^WB��ZFXFXFW ¬� ZFW ¬ W @ Wh«FZFXF®�Þ�WYZ � ÖÔG ¬!�Ó� ®hZ � ß � W ¬ W � ÚwT�] � ®YWYT�Z4i[�¨ªT�Xb�] �F� ©Ô�©!X �~�F� ©RV!WhXsT�Xb�Í[FZ @ WY«FZFX ã®�ÞFWYZ � c ¬ W �?� �©=®�ä�W � Wh� ¬ W �8� Wh­ � ©�Z � W�WYX � T � ZFWj� �;� ©!Z �8¬ W � WYXbV!©R`!W � [sT�X �8¬ ¨ ]�X�ÒÓWY®h��WYZ ��F� ]_XF®Y] � T ¬ Ö�G ¬ Z��] ¬ ] � W � ­!T ¬ Wh\^WhX��D[FW � ®YT V4]�� �h�L� T�[F]�© ã Ú ���~� ZFWYXF®hWeWj�HZ�X � WjÚ � ©!]_[F] �Ó� Wh\^WhX��� ��©4®�ÞsT � �] � ZFWÕTKAFX [FW^\^]_XF]�\Ø] � W �B¬ T���TÔ] ¬�¬ W�� � T�X � V!W �Ó� W3[FW � ÚwT�] � ®hW T�Z4i�Wj��®h©!X � W � V�W �¬ WhZ �2� XFW � ­!]_W Ö

• �wø ÷�ø�+d$%+�� ø=ÿg÷ W � �'Z�X T�XFXFWYT�ZÑ[FW � ��©4®�ä0T�­!W � ZF] � W^� � ©!Z�V�WÕ[sT�X ��¬ WØ\MrY\ØW ��ZFXFXFW ¬� ZFW ¬ ¨ ]�X0ÒÓWh®h��WYZ �B��� ]�X�®Y] � T ¬ Ö�G ¬Ä� W � \^Wj�[�¨ª© � �]_\^] � W �8¬ W���T�Z4i [FW'Ú © � \ TÔ��]�©!XM[FW � ÚwT�] �Ûã®YWYT�Z4i [�¨ªT�Xb�] �F� ©Ô�©!X � WhX � WY®j`4® ¬ T�Xb� ¬ W � T�Xb�] ��� ©���©!X �U� W � �T�Xb�^WhX,®h] � ®YZ ¬ TÔ�]_©!XÑ[sT�X �¬ W < WhVÔTÔ� � ©!X WhX AFX [�W ���h� ]�©=[FWÕ[�W�®h© ¬�¬ ] � ]�©!X Ög7 WhZ4i ã ®h] � ©!Xb�ØT ¬ © ��� [ � ® �h¬��Y�Ó�Y� [sT�X �¬ W < WjVÔTÔ� � ©!XØÒÓZ �ø� Z~¨ k P ó k à WyOXc � ZF] �e��� ]�X0ÒÓWh®h� �h� [sTÔX �B¬ ¨ ]�X�ÒÓWY®h��WYZ �8�F� ]�XF®h] � T ¬%� ZF] ¬ W �� T ¬ WYXb�]��?ÒÓZ �T� Z�¨ k c à WyO T VÔT�Xb�U[FW ¬ W � � � T�X � Ú �Y� W � [sT�X �U¬ W � Wh®h`=® ¬ WYZ � ÖK7 W3[FW � XF]_W � c�� ZF] ��� [FW[F] ��� © � ]��]�Ú � [FW � WjÚ � ©!]_[F] �Ó� Wh\^WhX��?[�W �?� T � �]�®hZ ¬ W �2� T � ÚwT�] � ®hW T�Z+[�¨ �Y¬ WY®h� � ©!X �ô a�a"õ&c � WhÚ � ©!]�[�]_� ¬ W � T�Xb��] �F� ©��©!X � Wh� ¬ W �o�F���h� T � W k ZFX�W �Ó� ]_X0ÒÓWY®j�]�©�X¹[sT�X �¬ ¨ ]�X�ÒÓWY®h��WYZ ��F� ]_XF®Y] � T ¬�� ©!Z � T�®Y® �Y¬��h� TÔ��]�©!X Ö

�h÷¼ös÷6� % � ���àü:��ý��s�: W < WjVÔTÔ� � ©!XMW � �eZFX � `=XF®�Þ � ©Ô� � ©�XE[�¨ ZFXFW�®Y] � ®Y©!X4Ú �Y� WhXF®YW�[FW�Q Ö S ä�\ � W � \^Wj����TÔX��e[�¨ªT�® ã® �Y¬_�Y� W �D� ZF] � [FWe®Y© ¬_¬ ] � ]�©!X�XFW �Ĭ W � ÚwT�] � ®YWYT�Z4i^[FW �F� ©���©!X � Wh�L[�¨ TÔX���] �F� ©��©�X � Ö�G ¬�� WhZ��qc k�¬ ¨ TÔ]�[FW[FW �e� W � ô!ô aU[F] �S!¬ W � Wh�'P c!k � ZsTÔ[ � Z �S!¬ W �;� Z �F� T�®Y©!X�[FZF®h��WYZ �Ó� c TÔ®Y® �h¬��h� W �8¬ W � ÚwTÔ] � ®hW T�Z=iEWhX

�F� ©RV!WhXsT�XF®hW'[FW ¬ ¨ ]�X0ÒÓWh®h��WYZ �8�F� ]_XF®Y] � T ¬ [FWØP ó k à WyO k l!c!k à WyOlc � ©!Z �8�F� ©4[FZ�] � W[FW � ®Y© ¬�¬ ] ã� ]�©�X � T V!Wh®�ZFXFW � XFW � ­!]_WH[FWBPdc l!Q < WyO�[sT�X �Ĭ WL®hWYXb� � W2[FWH\^T �Ó� W Ö�@ W ��� `��ßh\^W � \ T�­�X � ��] � ZFW �[FW^Ú ©=® T ¬ ] � TÔ�]_©!X¹Wh��[�¨ � ® � T � Wh\^WhX�� [�W � ÚwTÔ] � ®hW T�Z=i � W � \^Wj����WYXb�'[FW �F� ©=[FZF] � W ¬ W � ®Y© ¬�¬ ] � ]_©!X �

a ô

Page 29: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

{|~}w� a Ö S±� Ý ÞF©Ô�© [FW ¬ ¨ªT�®Y® �Y¬��h� TÔ��WYZ � 7 ©4®�äÔ® � ©�Ú{� ã âÑT ¬ �©!X { T�} | ¬ W^[ S \^W �Y¬ WY®h� � ] � Z�WY\ØWYXb�®�ÞsT � ­ � ®Y©!Xb��]�WYXb�D[FW � T0�©!\ØW � [�¨ Þb`=[ � ©!­�ßYXFW � ZF] � ©�X��D]_©!XF] �Ó�Y� � ¬ W � ®j` ¬ ]�X�[ � W � V�W � �]�®YT�Z4i � ©!Xb�[FW � ®Y©!X�[FWYX � TÔ�WhZ ��� ÖKC ®�Þ � \ T [�Z 7 ©4®�äÔ® � ©�Ú{� ã âÑT ¬ �©!X { «7} | Z�XFWÕÞsT�Z4�W^��WYX � ]�©!X ®Y©!Xb�]_X�ZFWA ©!Z��oW � �® �Ó�Y� W kÕ� T � ��] � [�¨ªZ�XFW \^©R`!WhXFXFW ã �WhX � ]_©!X#T ¬ �W � XsTÔ��]_V!W A TÔ® � T � Z�X WhX � Wh\'« ¬ WU[FW®Y©!X�[FWYX � TÔ�WhZ ��� ®iÖ

T�Z+®YWhX�� � W�[FW � [ � �Wh®h�WhZ ��� @�� Wj� 7�@;5HÖ7 ÞsT � ZFWfÚwT�] � ®YWYT�Z®Y©!Xb��]�WYXb�gS!Q � T � Z�Wh� � [FW � T � �]_®YZ ¬ W � cYWYZ=i ã \<rh\^W � ���h� T � ��] � WhX�� � ©!] ��� Z � W �Iã� T � ZFWj� � [FW P�a � T � ZFWj� � ®�ÞFT�®YZFX��~®YW �o� Z � W �Ûã � T � ZFWj� �o� ©�X��BW ��� T�® �h� [FWUa Ö Q µ � c�T ¬ © ���e� ZFW¬ W ��� T � ZFWj� �?¬ W � ©!Xb�8[FWS!l!Q'X � Ös: W � ÚwT�] � ®YWYT�Z4iÕ[FW �F� ©Ô�©!X � Wj�?[�¨ªT�Xb�] ��� ©���©!X � ®h] � ®hZ ¬ WhXb�?WYX� WhX � ]�XbV!W ��� W [sTÔX �¬ T < WhVÔTÔ� � ©!X!c�Wj�®Y© ¬_¬ ] � ]�©�XFXFWYXb� � WhXF[sT�Xb� � ZFW ¬D� ZFW � [F] Ü T�]�X�W � [�¨ ÞFWhZ � W � cT �F� ß �H¬ T ¬ ZF\^]_XF© � ]_� � ]_X � �T�Xb��T�X � W;[�WhV=]�WhX��H� � © � ÚwT�]�« ¬ W { ®jÚ Ö a Ö a Ö ad} ÖF7 Wj���W ���h� ]�©=[FW8[FW ��� ] � W[F©!XFX � WW � �eZ�X � �© � W Ö

a�c

Page 30: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

{|~}w� a Ö�� � : T � ��TÔ��]�©!X ®h]�« ¬ W | ¬ T ®h© ¬�¬ ] � ]�©!X�[�¨ªZ�X ÚwT�] � ®hW T�Z [FW �F� ©��©!X [FW#P�aÔk à WyO � Z �ZFXFW�®Y]�« ¬ W[FW�XF]�®�äÔW ¬g�F� ©=[FZF]��e[�W � TÔX���] �F� ©��©�X � Wh�e[�¨ TÔZ�� � W �;� T � ��]�®YZ ¬ W � c � ZF] � ©!Xb�;Ú ©=® T ¬ ] �Ó�Y�� T � ZFXFW ¬ WYXb�] ¬�¬ WBT VÔT�Xb�?[FW � T ��� W �?� T � Z�XMTÔ]�\^T�Xb� � ZF] ���h� T � W ¬ W � T�Xb��] �F� ©��©!X � [FW � T�Z�� � W �� T � ��]�®hZ ¬ W � Ö

{|~}w� a Ö ó � : W?[FWh«FZFXF®�ÞFW �H� W � VÔT�Xb� k�¬ T �F� ©=[FZF®j�]�©�XØ[�W � T�Xb�] ��� ©���©!X � Ö�: W2ÚwT�] � ®YWYT�ZØ[FW �F� © ã�©!X+W � �?WYXbV!©R` ��� Z � ZFXFW®Y]_« ¬ WB[�W�X�]�ä�W ¬ c �F� ©=[FZF] � T�Xb�8T�]_X � ]�[FW � T�Xb�] �F� ©Ô�©!X � Ö�7 W � [FW � XF]_W �Ó�� ���h� [F] �Ó� W ���Ó� WYX � XFW � ­!]_Wdc � ©!X#ÞF©!\Ø©!­ � X � ] ��� [sTÔX �o¬ W @ WY«FZFX�®�ÞFW � ÖÍ: W � T�Xb�] ��� ©���©!X �B� ©!Xb�WYX � ZF]_��W � �©=®�ä �h� [sTÔX �e¬ ¨ TÔ®Y®YZ�\'Z ¬ T0�WYZ ��� ZF] � WYXbV!©R` �h� [sT�X �8¬ ¨ª]_X0ÒÓWY®j�WhZ �2�F� ]_XF®Y] � T ¬ Ö

a�l

Page 31: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

GØÐ:G ñ �Æ´3É����?±L���?¶Õ³ËʼÌ�ä÷��ä÷¼ö % ü³²i�s�Q�U�Q�����i�N�����.���.�s�Q�: W¹[ � �Wh®h��WYZ � @�� W � �+®h©!X � ��]_��Z � [FW �F¬ Z � ]�WhZ ��� � ©!Z �Iã WhX � Wh\'« ¬ W �M��¬ T�® �Y� T�Z���©!Z � [�W �ÚwT�] � ®YWYT�Z4i*c�V!©�] �U� Wh®h��]�©!X-a Ö a Ö S ÖfG ¬ T¹ZFXFW ¬ ©!X�­!ZFWYZ � [FWMa�k¹\ÆWh�ØZFX�W�ÞFT�Z��WhZ � [FW#PRk¹\0cV!©!] � As­ Ö a Ö Q Öán X�T �Ó� ©=®Y]_WT�ZM[ � �Wh®h��WYZ � @�� Z�X � W � ß � W© � �ÞF©�XF© � \ � (x, y, z)

T `bT�Xb� � ©!Z �© � ]_­!]�X�W ¬ WÕ®YWhX�� � W+[FZ [ � �WY®j�WhZ � | ¬ ¨ªT0i4W zW � � © � ]�WhXb� � [sT�X �U¬ W � WYX � [FW �Ø��� ©���©!X � c ¬ ¨ªT0i4W

yV!W ����¬ W ÞsT�Z���Wh� ¬ ¨ T0i4W x

V�W ����¬ ¨ Wji=� �h� ]_WYZ � [FZ < WjV�T0� � ©�X Ög: W [ � �Wh®h�WhZ � @£� ®Y©!Z�V � W ZFXT�XF­ ¬ W � © ¬ ]_[FW�\^T0i4]�\^T ¬ T�Z���©!Z � [�Z � ©!]_Xb�o[�¨ ]�Xb�W � T�®j�]�©�X Wh� � © �Ó� ßY[�WUZFXFWU«á©!XFXFW � `=\ � � � ]_WT V�TÔX�� ã T �Ó� ]_ß � W Ö�n X � WYZ���T�]_X � ] � W �á�Y� W ��¬ W � ©!«=ÒÓWj� � T V�WY® ¬ WYZ �Ó� ®h©4© � [F©!X�X � W � ®j` ¬ ]�XF[ � ] � ZFW �(r, θ, φ)

c~T `!T�Xb� � ©!Z � © � ]_­!]�X�W ¬ W � ©�]�Xb�o[�¨ ]�Xb�W � T�®j�]_©!X { ©�Z V!W � �W�iic ®jÚ Ö ®�ÞsT � ]_� � WUS�} | r W � �T ¬ © ����¬ Te[F] � �T�XF®YW ke¬ ¨ªT0i4W z[sT�X �f¬ W �F¬ T�X�� � T�X � V!W �Ó� W (x, y)

c�Wj�θWj�

φ � ©�X�� � W �Ó� Wh®h�]�V!Wh\^WhX��¬ W � T�XF­ ¬ W �2� © ¬ T�] � WeWh�8T Ü ]�\'Z��T ¬ Ö�A X�­ � X �h� T ¬ c ¬ ¨ªT�XF­ ¬ W � © ¬ T�] � W θW � �8Wji �F� ]�\ � WYX+�W � \ØWo[FW

�F� WhZF[F© ã � T � ]�[F]�� � |

η ' −ln tanθ

2. { a Ö P§}

n X � WhZ���\ØW � Z � W � η k�� T � �] � [�Z3®YWYXb� � WB[FZ3[ � �Wh®h��WYZ � cF©!ZÕ«F]_WYX k�� T � ��] � [FW ¬ T � © � ]��]_©!X z[FZ^V�W � �Wji^[�¨ ]�Xb��W � TÔ®h�]_©!X �F� ]_\ T�] � W:�Ô[sT�X �L¬ W �F� WY\Ø]�W � ®YT � ©�X � T ��¬ W?[FWä> η [ � �WY®j�WhZ � ?�c4XF©Ô� �ηdet

csWh�8[sT�X �?¬ W � WY®h©!XF[M©!X � T ��¬ Wo[FWQ> η � Þb` � ] � Z�Wf?�c � ]�\ �F¬ Wh\^WhX���XF©�� � ηÖ

: © ��� [~¨ªZFX�W�®h© ¬�¬ ] � ]�©!X!c ¬ ¨ª]_\ � Z ¬�� ]_©!X [FZ ®YWYXb� � W+[FW+\ T ��� W3[�W � � T � �©!X ��� ZF]H]�Xb�W � T�­!] ��� WYXb�X�¨ W � � � T � X�Z ¬_¬ W [FT�X �'¬ TM[F] � WY®j�]_©!X z\^T�] � W ¬_¬ W ¬ ¨ W � �UT �F�F� ©Ri4]_\ TÔ��]_V�WY\ØWYXb��[FT�X �'¬ W �F¬ T�X� � T�X � V�W �Ó� W Ög: ¨ ]�\ � Z ¬�� ]�©!XM�©��T ¬ W'WhX zX�¨ � �T�Xb� � T � ®Y©!XFX�ZFWØ® T ��¬ ¨ TÔ®Y®YW � ��TÔXF®YW W � � ¬ ]�\Ø]_� � WWYX

ηcH] ¬ W � �Õ[F©!XF®ØÒÓZ�[F]�®h]�WYZ=i-[~¨ªZ4�] ¬ ] � W � [FW � VÔT � ] T�« ¬ W � � � T�X � V!W �Ó� W � ®h©!\Ø\^W ¬ ¨ ]�\ � Z ¬�� ]�©!X� � T�X � V�W �Ó� W ~pt

©�ZMWhXF®Y© � W ¬ ¨ � XFW � ­!]_WB� � TÔX � V�W ��� W Et[ � AsXF]_W �?� T � |

~pt = ~p sinθ , Et = Esinθ. { a Ö a^}

S!k

Page 32: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

{|~}w� a Ö Q��=OKZFWØWYX�®Y©!Z � W ¬ ©!X�­!]_��ZF[F]�XFT ¬ W�[FZ�[�Wh�Wh®h��WYZ � @�� T V!WY® ¬ WU� � T�ÒÓWh®h�©�­ � T � ÞFWdc ¬ W® T ¬ © � ]_\^ßj� � WeWh� ¬ W � ` � �ßh\^W k \'ZF©!X � Ö

S�P

Page 33: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

�ä÷��ä÷3� % ü³�.úP ´�.�Q�s�)�±� L��W���W_��Ww� ��õ���+bÿ;�Lögø,� õZ��ÿ1�Ñý��gü� ý{ùRû

: T ¬ ZF\Ø]�XF© � ]_� � [sT�X �f¬ W � ®h© ¬�¬ ] � ]�©!XFX�WYZ �Ó� [FW � T � �]_®YZ ¬ W �Jk ÞsTÔZ��W � XFW � ­!]�W � W � �DZFXUÚwT�®j�WhZ �Ú ©!XF[sTÔ\^WhX��T ¬ ®YT � T�®j� �h� ] � T�Xb� ¬ T¹\^T�®�ÞF]�X�W Öf: T ¬ ZF\Ø]�X�© � ]�� � ]_X � �T�Xb��T�X � W LW � �Ø® T ¬ ®YZ ¬_� W k

� T � �] � [FW � ® T � T�®j� �Y� ] � �] � ZFW � [FW � ÚwT�] � ®YWYT�Z4i � T �2¬ T � W ¬ TÔ��]�©!X |

L =f B Np Np

2π(σ2p + σ2

p).F { a Ö S^}

©^zf ' � S'c ô ä m Ü W � � ¬ TØÚ ���~� ZFWYXF®hW'[FW � ©��TÔ�]_©!XM[�W �B� T � Z�Wh� � c B F S!Q^W � � ¬ W�X�©!\'« � W�[FW

� T � ZFWj� �?� T � ÚwTÔ] � ®hW T�Zic Np{ Np

}HW � � ¬ WBXF©!\�« � Wo[FW ��� ©���©!X � { [~¨ T�Xb��] �F� ©��©!X � } � T �H� T � ZFWh�cσp

{ σp}?W � � ¬ TU[F]�\ØWYX � ]�©�X+� � T�X � V!W ��� W'[FZMÚwTÔ] � ®hW T�Z�[FW �F� ©Ô�©!X �l{ [~¨ T�Xb��] �F� ©��©!X � }2T�Z � ©!]_Xb�[�¨ ]�Xb�W � T�®j�]�©�X!c�Wj� 5 ZFX ÚwT�®j�WhZ � [FW'Ú © � \^W � ZF]Ä[ �h� WhXF[#WYXb� � W T�Z�� � W � [�W ¬ T ¬ ©!XF­!ZFWhZ � [�W �

� T � ZFWj� � Ö!: W �Ä� ]_® � [�W ¬ ZF\Ø]�X�© � ]�� � ]�Xb��TÔX��T�X � WH� ` � ] � ZFW?T�Z d ZFX GÓG T { d ZFX � G�G «7}@c�®hÚ Ö a Ö a Ö a Ö S�c� ©!Xb�8[FW ¬ ¨ © � [ � Wo[FW � k Ö PRk 30 ®h\ −2 � −1 { a�k!k Ö PRk 30 ®h\ −2 � −1 } Ö

A i �á�Y� ]�\ØWYXb��T ¬ WY\ØWYXb�qc�©!X#W � �]�Xb� �h� W �Ó��� � T �o¬ T ¬ Z�\^]_XF© � ]�� � ]�Xb� � ­ ��� W L � Z�]ÄW � � ¬ ¨ª]_Xb� �jã­ � T ¬ WB[FW ¬ T ¬ ZF\Ø]�XF© � ]_� � ]_X � �T�Xb��T�X � W � Z � ZFXFW �á�Y� ]_©4[�WB[FWo�Wh\ �F� [F©�XFX � W |

L =

τ

L(t) dt. { a Ö�� }A X3­ � X �h� T ¬ c L W � �?Wji �F� ]�\ � WBWhX+]�XbV!W ��� W � [FW � ©!Z �Ûã \�Z ¬ ��] �F¬ W � [�Z3«sT � X { « −1 } | ZFX+«sT � X FP « F PRk −24 ®Y\ 2 Ö: T ¬ ZF\Ø]�XF© � ]_� � ]_X�� � ­ �Ó� W ® T ¬ ®YZ ¬�� W � ©!Z � ®�ÞsT � ZFWØ­ � T�X�[FW ���h� ]�©=[FW'[�W ��� ] � WU[FW [F©!XFX � WØT�Z< WjVÔTÔ� � ©!X+W � � ���h� ZF\ � W[sTÔX �?¬ T � Wh®h��]�©!XEa Ö a Ö a Ö S Ö

: WKXF©�\'« � WK[�¨ � V�ßYXFWh\^WhXb� � ©�« � W � V �h� [�¨ ZFX �F� ©=®YW ��� Z � [F©!X�X � Nproc W � � � W ¬ ] �sk2¬ T � Wh®h�]_©!XW C ® TÔ®YW[FZ�\<rh\^W �F� ©4®hW �Ó� Z � σproc � T � |Nproc = ε . L . σproc, { a Ö ó }

εW � �ÄZFX'ÚwTÔ®h�WhZ � ®h© ��� WY®j�]_Ú � Z�] �F� WYXF['WhXU®Y©!\ � ��W ¬ W � [�]Dn �Y� WhXb�W � W C ® T�®h]_� �Y� Wj�fT�®h®YW � ��T�XF®hW �Wji �á�Y� ]_\^WhXb��T ¬ W � Ö��W���W_��W_� �ïø�� ÿg÷�ø¹ö�ø,� õZ��ÿ1�Ñý��gü� ý{ùRû

: W ��� T � T�\Øßh� � W � ]�Xb��W � V�WYXsTÔX���[sT�X �g¬ WD® T ¬ ®YZ ¬ [�W ¬ T ¬ ZF\^]_XF© � ]_� � ]�X � ��T�Xb��TÔX � WLXFW � WYZ4V!WYXb�rh� � W'®h©!XFX�Z � k ®�ÞsT � ZFW ® � ©!] � WY\ØWYXb�o[FW'ÚwTÔ] � ®hW T�Zic ¬ T ¬ ZF\Ø]�XF© � ]_� � ]_Xb� � ­ ��� WUW � �[F©�XF®U[F] � WY® ã�Wh\^WhX��\ØW � Z ��� W � T � [FW � [ � ��WY®h��WYZ �Ó� [�WØ\ØW � Z � WU[�W ¬ ZF\Ø]�XF© � ]_� �Y{ : Z�\^]_XF© � ]�� ` N ©!XF]��© � }ô aÔS�õ&cs®Y©!\ � © ���Y� [FW[FWhZ4i�WYX � WY\'« ¬ W � [FW�a � � ®h]�Xb�] ¬�¬ T0�WYZ ��� c �F¬ TÔ® �Y�?� Z �e¬ T'ÚwT�®YW]�Xb��W � X�W�[�W �«�©�ZF®�ÞF©!X � [FZ�® T ¬ © � ]_\^ßj� � WKc~[sTÔX ��¬ T ��� ­�]�©!X 2.7 ≤ |η| ≤ 4.4c�V!©�] � As­ Ö a Ö ô4Ög7 ÞFT � ZFW WhX ã

� Wh\'« ¬ W2[�W � ®Y]_Xb�] ¬_¬ TÔ��WYZ �Ó� ®Y©�\ � © � ��W?a � � © � ��]�©!X � [FW2®YW � ® ¬ W � ]�[�WYXb�] � Z�W � c � © �Ó��� [FT�Xb�L��©!Z��W �ZFXE��ZF«�W � ÞF©���©!\'Z ¬ �] �F¬ ]_® TÔ��WYZ � c4V!©�] � AF­ Ö a Ö c Ö~: W �e� ®h]�Xb�] ¬�¬ T0�WYZ ��� \^W � Z � WYXb� ¬ T ¬ Z�\^]_XF© � ]�� �WYXØ[ � ��WY®j��T�Xb� ¬ W �K� T � �]_®YZ ¬ W � ] �Ó� ZFW � [�W � ®Y© ¬_¬ ] � ]�©!X � ppÖ�A X^W~n�Wh�c ¬ W2® T ¬ ®YZ ¬ [�W ¬ T ¬ ZF\Ø]�XF© � ]_� �T�Z < WhVÔTÔ� � ©!X W � �L«FT ���2� Z �f¬ W ��� ©=®YW �Ó� Z � [FW ¬ TB®Y© ¬_¬ ] � ]�©!X pp

c![FW � WY®h��]�©!X W C ®YT�®YW?]_X �Y¬ T � ��] � ZFWSba

Page 34: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

[�¨ªWhXbV4] � ©!XMQ�P\'« Ö: TÑ\ØW � Z � W#[FW ¬ T ¬ ZF\Ø]�X�© � ]�� � W � �+]_\ � © � ��T�Xb�W � ©�Z �3¬ TÑXF© � \^T ¬ ] � TÔ��]�©!X [FW � [�©!XFX � W �0kT�XsT ¬ ` � W � Ö�: W �H� V!ßYX�WY\ØWYXb� ����� ©=[FZF]_� � [sT�X � ZFX � �© � W { ®hÚ Ö a Ö P Ö S�} � ©!Xb�LWYX � WY­!] � � ���Y� [sT�X � [FW �ZFXF]_� �Y�B¬ ©!­!] � Z�W � T �F� W ¬�� W �o� Z�X � Ö�7 ÞFT � ZFW � ZFX { Wh�o®�ÞsT � Z�W � �© � W§};TÕZ�X¹X=Z�\ �h� ©+[�¨ ]�[FWhX���] ãAs® TÔ��]�©!X+ZFX�] � ZFW Öá7 Wj����W � WY­!\ØWYXb��T0�]�©�X � W � \^Wj�?ZFX+� � TÔ]_�Wh\^WhXb� �F¬ Z �?� ]�\ �F¬ WB[�W � [F©!XFX � W � c� T � Wji4WY\ �F¬ W � ZFT�XF[ ¬ T � ZFT ¬ ]�� � [FW � [�©!XFX � W � X~¨ªW � � � T � ®Y© �Ó� Wh®h�W {w��� ©!« ¬ ßY\ØW2[sT�X �K¬ ¨ªZFX [FW �� ©!Z �Iã � ` � �ßh\^W � [FZ�[ � ��WY®j�WYZ � cáWh�® Ö } � WYXF[sTÔX��eZFX � ZFXicá©�X � WIÒÓWh�Ó�W®YW � Z�XMWj� ¬ ¨ª©!X+­bT � [FW ¬ W� W � �W8[FZ � �© � W Ö4@ W ¬ T\<rh\^W2\^T�XF]_ß � WKcb®�ÞsT � ZFW � ZFX^W � � � ZF«á[F]�V4] ��� WYX « ¬ ©=® � [FW ¬ ZF\Ø]�X�© � ]�� �TR`!T�Xb�U®�ÞsT�®hZFX ZFXÑ]_[FWYXb��]DA�T�Xb��ZFXF] � Z�WdcÍT �F� W ¬�� :�×�J { : ZF\^]_XF© � ]_� ` × ¬ ©4®�ä J ZF\'«áW � } Ö�9 X« ¬ ©=®[FW ¬ ZF\Ø]�XF© � ]_� � W � �;ZFX ¬ T �F� [FW�WY\ �F� [FZ � T�Xb� ¬ W � ZFW ¬ �©�Z��W �;¬ W ��� ZsTÔX���]_� �Y�;� W ¬ TÔ�]�V!W �kج T ¬ ZF\^]_XF© � ]_� �o� ©!Xb�;\ØW � Z ���h� Ö Ý ©!Z � ®Y© ��� Wh®h��WY\ØWYXb�BXF© � \^T ¬ ] � W �H¬ W � [F©!X�X � W ��k TÔXsT ¬ ` � W � c¬ W � \^T�Z�VÔT�] � « ¬ ©4® � [FW ¬ ZF\Ø]�X�© � ]�� �l{w� T � [FW ¬ ZF\Ø]�XF© � ]_� � WYX � WY­�] � � ��� WdcsWh��® Ö } � ©!Xb� � ­!T ¬ Wh\^WhX��� WIÒÓWj� �h� Ö�5W_��W_��W � WDø��#�fû�÷Ôý ü ö�ø��^ö�ø3�g÷0ý&�YøEögø ögü�1�gû�ø��

6 Z < WhVÔTÔ� � ©!X!cD] ¬ `,T �F¬ Z � ]_WYZ �Ó� ­ � T�XF[�W �Õ�á�Y� ]�©=[FW � [FW ��� ] � W � [FWE[F©�XFX � W � T �F� W ¬_� W �> d ZFX � ? Ö�A Xb� � Wo®�ÞsT � ZFW d ZFX { ©�Z C Þ�Z��[F©?µ?X7}@c ¬ We[ � ��WY®h��WYZ �2� ZF«F]��2[FW �2�Ó�Y� T � TÔ��]�©!X � ©!ZÕ[FW �\^©=[F]DAF® TÔ��]�©!X � TKAFX [�¨ªT�\ �h¬ ]_© � W �8� W �B� W � Ú © � \^T�XF®hW �e� ©!Z �;¬ W d Z�X � ZF]�VÔT�Xb� Ö�: W � [F]Bn �h� WYXb� �d ZFX � TÔZ < WhVÔTÔ� � ©!X � ©�X�� ¬ W �?� ZF]�VÔT�Xb� � |• ¬ W d ZFX G � ¨ � �WYX�[E[FW PRl!l!a k PRl�l!Q]c• ¬ W d ZFX G�G T � ¨ � ��WYXF[M[�¨ T V � ] ¬ a�k!k!aeÒÓZ �T� Z�¨ k Ú � V � ]�W � aÔk!k!Q]c• ¬ W d ZFX G�G «�P�TU®Y©!\Ø\ØWYXF® � WYX'ÒÓZF]�XMa�k!k�Q Wj� � ¨ W � �?��W � \Ø]�X � WYXMT�©�¶��ea�k�k ô c• ¬ W d ZFX G�G «�a T � � � ®h© ¬�¬ WY®j� � WYXb� � W©4®j�©!« � W�a�k!k ô Wj��ÒÓZF]�XMa�k!k�l]c• ¬ W d ZFX G�G «sSØTU[ � «�Z�� � WYX � W � �Wh\'« � W�a�k!k�l Ö

6 Z#®Y©!Z ��� [FZ d Z�X G c ¬ W < WhVÔTÔ� � ©!X T3[ �Y¬ ]_V ��� ZFXFW ¬ ZF\Ø]�X�© � ]�� � ]�Xb� � ­ ��� WU[FW+P � k � « −1 � T �Wji ���h� ]_WYXF®hWdcKT V!Wh®�Z�XFW � XFW � ­!]_W3T�Z ®YWhX�� � W+[FW3\^T ��� W3[FW#P Ö c < WyOlc � W � \ØWh���T�Xb� T�]_X � ]HT�Z� ZFT � ä3�© � [�¨�rh� � W�[ � ®Y©!Z4V!W � �WYXÑP l!l ó ô a � õäôªa ó õ Ö�: T^­ � T�X�[FW �á�Y� ]�©=[FW� � TÔX � ]��©!] � WWYXb� � W ¬ Wd ZFX G Wh� ¬ W d ZFX G�G TUT � W � \Ø]_�H[FWBÚwT�] � WB[�¨ ]�\ � © � ��TÔX���W � T�\ �h¬ ]_© � TÔ��]�©!X � [FT�X �?¬ WB®h©!\ �F¬ W�i�W[�¨ TÔ®Y® �h¬��h� TÔ��]�©!X�[FW 5 W � \Ø] ¬ T�«!c � ZF]�©!Xb� � W � \Ø] � [�¨ªT�®Y® � ©"!_� � W ¬ ¨ � XFW � ­!]�W�T�ZM®YWhX�� � W�[FW�\^T �Ó� Wdc� Z�]HW � � � T �Ó��� [FW¹P Ö c < WyO � ©�Z �'¬ W d Z�X G k P Ö l!Q < WyO � ©!Z �'¬ W d ZFX G�G T'c � Z�]_V=]_��[�¨ªZ�XFWÚ © � ��WUT�ZF­!\ØWYXb�TÔ�]_©!X [FW ¬ T ¬ ZF\Ø]�XF© � ]_� � Öá: WU[ � ��WY®j�WYZ � @�� T � ­bT ¬ WY\ØWYXb� � � �U�Ó� V=] �Ó�Ø� ©!Z �® � ©D!�� � W ¬ W ��� W � Ú © � \ T�X�®YW � [FW � W � [�]Dn �Y� WhXb� ��� ©!Z �Iã [ � �WY®j�WhZ ��� cKT�]�X � ] � Z�W � ©!X � `��ßh\^WÕ[�W[ � ® ¬ WYX�®�ÞFWY\ØWYXb�fWj��[�¨ªT�® � Z�] � ]��]_©!X!c { ®jÚ Ö a Ö a Ö S8Wh�Äa Ö a Ö�� } Ö0: W � T�Z4� � W ���á�Y� ]�©=[FW � [FWL� � T�X � ]_��]�©!X � c«�WYT�ZF®Y©�Z �M��¬ Z � ®Y©�Z � ��W � WYXb� � W ¬ W � d ZFX � G�G TUWh� GÓG «�P^c ¬ W � d ZFX � GÓG «�P�Wh� G�G «�a�cFWh� ¬ W � d ZFX �G�G «�a�Wj� G�G «sS'©�X�� � W � \Ø] � [FWeÚwT�] � W;[FW �2���Y� T � TÔ��]�©!X � c�©�Z � Z�W ¬Ç� ZFW � XF©!Z�V�W ¬_¬ W � ]�X � ��T ¬_¬ TÔ��]�©!X � Öà � ��®YW k �©�Z � ®hW � ®�ÞsTÔXF­!WY\ØWYXb� � c�©�X �F��� V!©!]�� � ©!Z �g¬ ¨ WYX � WY\'« ¬ WH[�W � d ZFX � G�G ZFXFW ¬ ZF\Ø]�X�© � ]�� �]�Xb� � ­ ��� Wo[FW ��¬ Z � [FW PRk fb−1 � ©�Z �2¬ ¨ Wji �á�Y� ]_WYXF®hW @�� [�¨ ]�®h]iAsXEa�k�P!P^c4V!©!] � As­!Z � W�a Ö l Ö: T � WY®�ÞFW � ®�ÞFW [�Z m ]�­!­ � [FT�X � ®YWh�Ó�W+�ÞFß � WMT � � ����� T ¬ ] ��� W3[FT�X � ¬ W � [�©!XFX � W � [�W � d ZFX �G�G T]c G�G «~P Wh�^ZFXFW � T � ��]�W�[FZ d ZFX GÓG «�a�WhX � Wh­!] � � ��� W � WYXb� � W ©4®j�©!« � WEa�k!k ô Wh� [ � ®hWY\'« � Wa�k!k!c Ö Ý ©�Z �2�F¬ Z � [FWB® ¬ T � � � c4[sT�X �2¬ T � Z�]_�W;XF©!Z � XF©Ô�W � ©!X � > d Z�X G�G ? ¬ ¨ WYX � WY\'« ¬ WB[FW � d ZFX �

S!S

Page 35: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

G�G T]c GÓG «�P^c G�G «�a^Wj� G�G «FSä��XF©�Z � XF©Ô�W � ©!X � > d Z�X G�G T"? ¬ W d ZFX GÓG Tä��Wj�BWhX]AsX¹XF©!Z � XF©���W � ©�X �> d ZFX G�G «'? ¬ ¨ WYX � WY\'« ¬ W2[FW � d ZFX � G�G «�P^c G�G «�aoWh� G�G «FS ÖbG ¬�� W � T � T � ®Y©!X �Ó�� ZFWhX�� �F��� ®Y] ���?� ©�Z �®�ÞsT � ZFW�T�XsT ¬ ` � Wo[FW®YWj����W���ÞFß � Wdc ¬ T'®h©!\ � © � ]_�]_©!XÕ[FW � d ZFX �e� �ZF[F] �Y� Ö

�ä÷��ä÷1� % ��� �'�súQ� / � L �]�5�7�'��ú�ý��: W � WYX�ÒÓWYZ4i � Þ�` � ] � ZFW � [FZ d ZFX GÓG � ©!Xb�U[FW ÚwTÔ] � W^[FW � \ØW � Z � W �U�F¬ Z ���F�Ó� ®Y] � W � cfWh�'[FW\^Wj��� � W?WYX � V=]�[FWhXF®YWe[FW � ]�­�XsT�Z4i � T � W � ®h©!\^\ØW ¬ W?«á© � ©!X^[FW m ]�­�­ � Ö�: ¨ªT � ®�ÞF]��Wh®h�Z � W8[FZ [ ��ã�Wh®h�WhZ � @�� T;[F©!X�® � � � T�\ �h¬ ]_© ��� WL[sTÔX � �©�Z �Ĭ W � [F©!\^T�]_XFW � [FW�[ � �WY®j�]_©!X Ö!: W �f�F� ]_XF®Y] � T�Z4i

�Y¬_� \ØWYXb� �f�Ó�Y� T � �] � [FZ ®YWYXb� � W8[FZ [ � ��WY®h��WYZ � V!W ���D¬ ¨ Wji=� �h� ]_WYZ � c � ©�Z �f¬ W d ZFX G�G c � ©!Xb�D[ � ® � ]_� �®Y] ã [FW ��� ©�Z � Ö�A ��T�Xb�B[�©!XFX �X� ZFW2Òh¨ TÔ]ÍWfn~Wh®h�Z � \^W � � � T VÔT�Z4iM[FW�����®�ÞFW�[FW � W � V=]�®hW � Z �;¬ W�® T 㬠© � ]�\Øßh� � WdcsWj� � ZFW � T � T�] ¬�¬ WhZ ���?¬ W�® T ¬ © � ]�\Øßh� � WW � � ¬ ¨ªZ�XFW�[FW � ®Y©�\ � © � TÔX���W �B��� ]�\Ø© � [F] T ¬ W �� ©�Z �2¬ ¨ªT�XsT ¬ ` � Wo[FW®YWj����W��ÞFß � Wdc�] ¬~� W � T �����Y� WYXb� ���F¬ Z � WYX�[ � �T�] ¬ Ö��W���W � Ww� WKø¹ögûbùRø�+�ùRø=ÿ�÷Õö�øEùR÷�õ�+!ø��

: WU[ � �Wh®h��WYZ � [FW'� � T�®hW �<{ ©!Z � � T�ÒÓWh®h��©!­ � T � ÞFW§}@c � W � \ØWh�B[FW � WY®h©!X � � � Z�] � W ¬ T^� � T�®YWU[�W �� T � �]�®hZ ¬ W � ®�ÞsT � ­ � W � Ö?: W � ]_X�Ú © � \ TÔ��]�©!X �Ø� Z �3¬ T � � T�®hW � ©�X��+W ��� WYXb�]_W ¬�¬ W �3� ©!Z � [�W¹XF©!\ ã« � WhZ � W � T�XsT ¬ ` � W �lk @�� Wh��XF©���TÔ\^\ØWYXb� ¬ ¨ ]�[FWhX���]DAs®YTÔ�]_©!X [FW � ÒÓWj� � [�W � ZsT � ä � « [FT�X ��¬ T� Wh®�ÞFW � ®�ÞFW [FZ m ]�­�­ � c { ®jÚ Ö ô4Ö ô4Ö P"} Ö~: W'� � T�ÒÓWh®h��©!­ � T � ÞFW'W � �®Y©�X � ��]_�Z � [FW'� � ©!] �e� T � �]�W � | ¬ T� T � �]�W ¬ T �F¬ Z � ®YWhXb� � T ¬ WÕW � �UZFX [ � ��WY®h��WYZ � [�W V!W � �W�i T ��� W ¬�� C�NM< { C ] ¬ ]�®h©!X N ]�® � © � � � ] �< � T�®�ä�W � }@cf] ¬D� W � \ØWh�U[FW3\ØW � Z � W �U¬ T � © � ]��]_©!X [FZ V�W � ��Wji [~¨ª]_X���W � T�®h��]�©!X �F� ]�XF®h] � T ¬ Wj� [FW[ � ��W � \^]_XFW �Ĭ TB� � TRÒÓWY®h��©!] � W2Wh� ¬ ¨ª]_\ � Z ¬�� ]_©!X�[�W �K� T � �]�®hZ ¬ W � ®�ÞsT � ­ � W � ��WYX � ZF]_��W8Z�X^[ � �Wh®h�WhZ �k As« � W �;� ®Y]_Xb�] ¬_¬ T�Xb��W � T �F� W ¬�� 7�5�< { 7 WhXb� � T ¬ 5 ]_«�W � < � T�®�äÔW � };WYXb�©!Z � W ¬ W CFN�<oÖ~G ¬�� W � �oT� Wh®Y©!X � � � ZF] � W ¬ T;� � T�ÒÓWh®h�©�] � WH[FW �f� T � �]_®YZ ¬ W � ®�ÞFT � ­ � W �K� ©!Z � \ØW � Z � W �f¬ WYZ � ]�\ � Z ¬_� ]�©�X��0WhX]AsXZFX�T�]�\^T�Xb� � © ¬�� XF©dj�[sT ¬s{ C © ¬ WhXF©!]_[sT ¬ N T�­!XFWj�@}�WYXb��©!Z � W ¬ W CFNM< Wj� ¬ W 7�5�<oÖ�G ¬ �F� ©=[FZF]��2ZFX®�ÞsT�\ � \^T�­!X � �] � Z�WeZFX�]_Ú © � \^WKc � Z�]áVÔT�®h©!Z � «�W �H¬ To� � T�ÒÓWY®j�©!] � W8[FW �L� T � �]�®hZ ¬ W � ®�ÞFT � ­ � W � Wj�� W � \ØWh�Ó� � W [FWØ\ØW � Z � W ��¬ WhZ � ®�ÞsT � ­�W^Wj� ¬ WYZ � ]�\ � Z ¬_� ]_©!X Ö�: W � \^TÔ� �h� ] TÔZ4i¹©!Xb� � � � ®�ÞF©�] � ] �TKAsX [�W � Z �F� © � �W �B¬ W � ÞsTÔZ��W � [F© � W � [FW � T�[�] TÔ��]�©!X�[FZ d ZFX GÓG�Ö~: W � ®�Þ � \^T [FZ¹[ � �Wh®h�WhZ �[FWo� � T�®YW � [�W @£� W � � �����Y� WYXb� �lkU¬ TlAs­!Z � W�a Ö ô4ÖWDõ�+!üáÿ1+Ôú�øU·bû�÷�ü ô a�Q�õ | W ¬�¬ WET � � � ]�X � ��T ¬_¬�� WM[FZ � T�Xb� ¬ W C Þ�Z���[F©?µ?X�WYXb� � W ¬ W d ZFX G�G TWh� ¬ W d ZFX GÓG « ÖFA ¬�¬ W;T � ©!Z � «FZ��2[~¨ T�Z�­!\^WhXb�W �H¬ T ��� ©���WY®h��]�©!X [FZ CFNM< Wh�H[FZ 7�5�< ®Y©!Xb� � W¬ W �;� TÔ[F] TÔ��]�©!X � ÖáA ¬�¬ W � W � \ØWh� � ­bT ¬ WY\ØWYXb�B[�¨ªT�\ �Y¬ ]�© � W �?¬ T � WY®h©!X � � � ZF®j�]_©!X¹[FW � � � T�®hW � T�]_X � ]� ZFW ¬ T'\ØW � Z � W[FZ � T � TÔ\^ßj� � Wo[~¨ª]_\ � TÔ®h�?Z���] ¬ W k ¬ ¨ª]_[FWYXb��]DAs®YTÔ�]_©!XÕ[FW � ÒÓWj� � [FW � ZsT � ä � « ÖWDø¹¸��è� ô a ô õ | ] ¬K� ¨ � �WYX�[ � Z � Z�XFW ¬ ©�XF­!ZFWhZ � [�W3Q � ®h\0cg] ¬ T�ZFXFW � T � �]_W^®hWYXb� � T ¬ W � ZF]®Y©!Z4V � W |ηdet| � P Ö ó Wh�8ZFXFW � T � �]_WTRVÔT�Xb� � ZF] ®Y©�Z�V � W ¬ T ��� ­!]�©�X |ηdet| � S Ö: T � T � �]�W�®YWYXb� � T ¬ W � WU®h©!\ � © � W'[FW QÕ\Ø©4[FZ ¬ W � Ú © � \ �Y� [FW'�©�XFXFW TÔZ4i¹Wj�o[FWU[F] �T� ZFW � > 5 ?�c{ ®jÚ Ö As­ Ö a Ö PRk^} Ö�7 ÞFT � ZFW'�©!X�XFW T�Z¹W � �o®h©!X � �]_��Z � [FW � Z �F� © � �BWYX × W � ` ¬_¬ ]�Z�\ TR`!T�Xb� � ZsTÔ� � W®Y©!Z�®�ÞFW � [�W�[ � �WY®j�WhZ ��� C ] ¬ ]_®Y]�Z�\Î[FW � T `!©!X � a Ö ô c �FÖ ó c�Q Ö Q]cáWh�;l Ö ó ®Y\vc { ®jÚ Ö As­ Ö a Ö P!P§} Öá: W �®Y©!Z�®�ÞFW � P�Wh�;S � ©!Xb�;®h©!\ � © �Ó� W � [�¨ ZFXFW�ÚwT�®YW � Wh®Y©!Z�V�W � �W'[FW � ] � �W � W � \ØWh�Ó��T�Xb� ¬ T \^W � Z � WWYX

r − φÖ4: W � ®Y©�ZF®�ÞFW � a�Wj� � � ©!Xb�2Ú © � \ � W � [~¨ªZFX�WBÚwT�®YW � W � \^Wj���T�Xb� ¬ T�\ØW � Z � W;WYX r − φ

cWh�[�¨ ZFXFWØT�Z4� � W � Z �¬ T � ZFW ¬�¬ W ¬ W �o� ] � �W � Ú © � \ØW � WhX�� � WØW ¬_¬ W � ZFX T�XF­ ¬ W � � �h� Wh©�[�W a ◦ Ö 7 Wh�T�­!WhXF®YWh\^WhX�� � W � \ØWh� ¬ T � WY®Y©�X � � � ZF®j�]�©�XE[FW �e� ©!]�Xb� � [~¨ª]_\ � TÔ®h�8WYXESØ[F]_\^WhX � ]_©!X � Öá7 ÞsT � ZFW�©!X�XFW T�Z¹W � �Ú W � \ ��� T � ZFX#[F] �T� ZFWH> 5 ?�[ � ®h©!Z �á� WhX P�a � Wh®h�]_©!X � Wj� � WY®h©!Z�V�W � � � [FWU[FWYZ=i

S �

Page 36: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

®Y©!ZF®�Þ�W � [�W^[ � �Wh®h�WhZ ��� C ] ¬ ]�®h]�ZF\ ÚwT�] � T�Xb��ZFX TÔXF­ ¬ W [FW^S!k ◦ WYXb� � WØW ¬�¬ W � Ö�: W � [�] �T� ZFW � > 5 ?� ©!Xb��T�Z�X�©!\'« � W^[FWØ[F©!Z Ü WØWh� � ©!Xb� � ]_��Z �Y�Hk |z| F P�a Ö ó cga ó4Ö S'c�S!c Ö a'c � S Ö P^c � c Ö PØWh� ó S Ö P®Y\ ÖFG ¬�� ©!Xb�8ZFX � T `!©�XM]_X���W � XFW[FW�a Ö ó�ô ®h\°Wh�8ZFX � TR`�©!XEW�i=�W � XFW�[FW�l Ö l�Q ®h\: T � T � ��]�WoT VÔT�Xb�?®Y©!\ � © � ��WB[FWYZ=i+­ � TÔXF[ � [F] �T� ZFW � > m ? � ]_��Z �Y�·k |z| F PRk!k Ö�� Wh�P�a=P Ö k'®h\0cTRV�WY®?ZFX � T `�©!X^]_Xb�W � XFW2[FW8l Ö ó ®Y\�Wj� � T `!©�XØW�i=�W � XFW8[FW8a�Qo®Y\ Ö Ý ©!Z �K¬ W d ZFX G�G «ic ¬ W � [FWYZ4i[F] �ø� Z�W � > m ? ¬ W �K�F¬ Z � Wji=�W � XFW � ©!Xb� � � � WhX ¬ WjV �h� Wh� ¬ WYZ �K� ` � �ßY\ØW8[FW ¬ WY®j�Z � W8W � �LZ��] ¬ ] ���2� T �¬ T'®Y©�ZF®�ÞFW ÜY�Y� © Ö: T'®�ÞFT � ­!W;[ �Y� © ��� W � Z � ®�ÞsT � Z�W � ] � �WB[FW � ] ¬ ]�®Y]_ZF\ W � � � Wh®YZFWh] ¬�¬ ]�W � T � Z�X3® T�XsT ¬ ]�X�[F]_V=]�[�ZFW ¬Wh�'� � T�]�� � W � T � Z�X ®h] � ®YZF]��']�Xb� � ­ �Ó� \^©�X�� �Õ� Z �'¬ WÕ[ � �Wh®h��WYZ � Öf: W CFNM< ®Y©!\ � �W ô l!S k!k�kV!©!] i3[FW ¬ Wh®h��Z � WWh�eTUZFXFW[�¨ �Y� T�] �Ó� WYZ � [FW�k Ö k!S ó o

0# Ö

WDø���º2� ôªa�cKõ | ] ¬ ®Y©!Z�V � W ¬ T ��� ­!]�©�XÑ[FW � T � ]�[F]�� � |ηdet| < 2cÄWj�UW � �^®h©!X � �]_��Z � [FW3Þ�ZF]��®h` ¬ ]_XF[ � W � ®h©!XF®YWhXb� � ] � ZFW � [�W � ZF«FT�X � [�WlAs« � W �B� ®Y]�Xb��] ¬�¬ T�Xb�W � cs[FW � T `!©!X ®h©!\ �F� ] � WhX�� � W aÔkWh� ó a ®h\0c { V!©�] � As­ Ö a Ö ô } Ö : W � [FWYZ4i¹®h` ¬ ]_XF[ � W � ®YWhX�� � T�Z=i#\^W � Z � W3P Ö Q!QÕ\ [FW ¬ ©!XF­3Wj� ¬ W �

� ]�i¹T�Z�� � W � a Ö ó aÕ\ Ö�: W � ®j` ¬ ]�XF[ � W � ©�X��®�ÞFT�®YZFX [FWhZ4i [F©!ZF« ¬ Wh� � [FWXAs« � W � c ¬ W'[F©!Z�« ¬ Wj�]�X ã�W � XFW�W � �;T ¬ ]�­!X �;� ZF]�V�TÔX�� ¬ ¨ T0i4W[FZ�ÚwT�] � ®YW TÔZMWj� ¬ Wo[F©!ZF« ¬ Wh�8Wji=��W � X�W�ÚwT�]��?ZFX T�X�­ ¬ Wo[FW ±3◦� � �h��� ©MT V�WY® ¬ ¨ªT0i4W zÖ�7 Wj����W^TÔ­!WYXF®hWY\ØWYXb� � W � \ØWh�BZFXFW � Wh®Y©!X � � � ZF®h��]�©!X¹� � ]�[�]�\ØWYX � ]�©!XFX�W ¬�¬ W[FW � � � T�ÒÓWY®j�©!] � W � Öá: W � AF« � W �e� ®Y]�Xb��] ¬�¬ T�Xb�W �2� ©!Xb�;T�ZMX�©!\'« � W�[FW ô QØc!k!kØT V!Wh®�ZFXM[F] T�\Øßh� � W[FWEc�S ó

µ\ ÖfA ¬_¬ W � � ©!Xb� ®h©!\ � © �Ó� W � [�¨ ZFX�\ �Y¬ T�XF­!W3[FW � © ¬ ` � � ` � ßYXFWKcL[FW � T � TÔ�W ��� Þ � Xb` ¬

{ P � WYX � ©!]�[7}Wh�U[�W+S ã Þb`=[ � © i=`¼»�T V!©!X�W { P ó k!k �F� \|}@c � W � \ØWh�Ó��T�Xb� TÔ]�X � ]H[FW �Ó�Y� \ØWh�Ó� � W¬ ¨ � XFW � ­!]_WÕ[ �Y� © �Ó� W � T �U¬ W �U� T � �]�®hZ ¬ W �'� ©�Z � Ú © � \ØWÕ[FW � ÞF©Ô�©!X � [FW ¬ ©!XF­!Z�WYZ � [�¨ ©!XF[�W�[�Wó S!k XF\ Öá7 ÞFT � ZFWHAs« � W � ®Y]_X���] ¬_¬ T�Xb�W k ZFXFW�Wji=� �Ó� \Ø]_� � Ú © � \ � W[�¨ªT ¬ ZF\Ø]�X�]�ZF\vc � W � \^Wj����TÔX��[FW ��� » � ®�ÞF] ��¬ T ¬ ZF\Ø]�ß � Wdc � ©!Z � \Ø]�XF]_\^] � W �D¬ W ��� W � �W � c�V�W ���?¬ ¨ T�Z4� � W;Wji=� �Ó� \Ø]_� �Q� Z�]�W � �?®Y©!Z ã�F¬�� W k ZFXFW3As« � WM� � T�X ��� © � �T�Xb� ¬ T ¬ ZF\^]_ß � W'ÒÓZ �T� Z�¨ k ZFX Ý ÞF©���© ã 7 ©�\ � ��WYZ � [FW : Z�\^]_ß � WOB] � ]�« ¬ W { O : Ý 7 | OB] � ]�« ¬ W : ]_­!Þb� Ý ÞF©Ô�© 7 ©!Z�X���W � }fc � ZF]�T �Ó� Z � W ¬ T®Y©!XbV�W ��� ]�©!X3[�W ��� Þ�©��©!X �WYX � ]_­!XsT ¬ [�W�®�ÞFT � ­!W Ö Ý ©�Z �?��� [�ZF] � W ¬ Wo« � ZF]_����ÞFW � \^] � ZFWdcFZ�X � ` � �ßh\^W[FW � WjÚ � ©!]_[F] �Ó� Wh\^WhX��® � `�©!­ � XF] � ZFW'\^T�]��]�WhXb� ¬ TØ��WY\ ���h� TÔ��Z � W�[FZ3O : Ý 7 WYXb� � WUQ Wj�'PRS!Ù Öá: W 7�5�< ®h©!\ � �W ô PQ!c!k'V!©!] i3[FW ¬ WY®h��Z � WWj�;TUZFX�W�[~¨ �h� T�] �Ó� WhZ � [�W�k Ö k�P Slo

0

ÖWe- õsý�� õ���ù �Yü� û��güM½�ö�õ�� ôªS4Põ | ] ¬ WhXb�©!Z � W ¬ W CFNM< Wh� ¬ W 7�5�< c�] ¬ TÑZFX*[�] T�\Øßh� � WEW�i ã�W � XFW�[FW�P Ö�� a¹\)Wh�ØZFX�W ¬ ©�XF­!ZFWhZ � [FW a Ö ô S¹\vc { V�©!] � As­ Ö a Ö P�aK} ÖKG ¬ [ �Y¬ ]_V � W+ZFX ®�ÞsT�\ �\ T�­�X � ��] � ZFW?ZFXF]�Ú © � \ØW2[FW;a < � T � T ¬_¬ ß ¬ W k¬ ¨ªT0i4W z

c � W � \ØWh���T�Xb�H[�We®h©!Z � «áW �D¬ TB� � T�ÒÓWh®h�©�] � W[FW �8� T � �]�®hZ ¬ W � ®�ÞsT � ­ � W � Wj�BT�]_X � ]~[FW�\ØW � Z � W �?¬ WYZ � ®�ÞFT � ­!WWj� ¬ WYZ � ]_\ � Z ¬�� ]_©!X Ö4G ¬ � © �Ó� ßh[FW[FWYZ4i^®h©!ZF®�ÞFW ��� Z ��� T�®h©!XF[FZF®j� � ]�®YW �ä� ZF]�Ú ©!XF®h��]�©!X�XFWYXb� k ZFXFW8�Wh\ �á�Y� TÔ�Z � W ��� ©=®�ÞFW;[FW�PRk�ä Ö: ¨ªT�]_\ T�Xb� � © ¬�� XF©dj�[sT ¬ T ZFX �Y� T�] �Ó� WYZ � [FW�k Ö lXo0

Ö�Bø�÷���üá÷�� õ��;+!ø¹ö�ø�� ö�ûbùRø�+�ùRø=ÿg÷+ö�ø ùR÷�õ�+!ø�� : ¨ W C ® T�®h]_� � [FW � Wh®Y©!X � � � ZF®h��]�©!XEW � �e[FW �F¬ Z �[FW�l ó�� [sT�X �8¬ T �Ó� ­!]_©!X+®YWhX�� � T ¬ W |η| < 1.5 � ©!Z � [FW �e� T � �]_®YZ ¬ W � [�¨ ]�\ � Z ¬_� ]�©�X � Z �á�Y� ]�WYZ � Wk P Ö óoà WyO Ö!A X [FWk� T]c ¬ W �Ä� T � ��]�®YZ ¬ W � �WYX�[FWYXb� ko��� ] � T ¬ W � T V�WY®?ZFX � T `!©�X^[FW2®h©!Z � «FZ � W2X~¨ª]_\ ã�F¬ ] � ZFT�Xb� �F¬ Z ��� Z�¨ ZFXØXF©!\'« � W ��� [FZF]_�K[�W � ©!]_X�� � [sT�X �K¬ W � ®Y©�ZF®�ÞFW � [FZ 7�5�<oÖ=: T �Ó�Y� © ¬ Z���]�©!X� Z �B¬ ¨ª]_\ � Z ¬�� ]�©!X3� � T�X � V!W �Ó� WU[FW � � � T�®YW � [FW�ÚwT�]_« ¬ W�]�\ � Z ¬_� ]_©!XM[FT�X �B¬ W�� � T�ÒÓWY®j�©!­ � T � Þ�W'W � �[FW

σp/p2T ≈ 0.2%

Ö=: T ���Y� © ¬ Z4�]�©�X � Z �L¬ T�\ØW � Z � W8[FZ � T � TÔ\^ßj� � W8[�¨ ]�\ � T�®j� � ¨ � ®�ÞFW ¬ ©!XFX�WB[FWP ó k S!k µ\ WYX { r, φ

}BWYX Ú ©!XF®h��]�©!X¹[�W ¬ T ��� WYZ�[F© ã � T � ]_[F]_� � Wh� � ©�Z � [F]Dn �Y� WYXb�W � VÔT ¬ WYZ �Ó�[FW ¬ ¨ ]�\ � Z ¬�� ]�©!XØ� � T�X � V�W �Ó� W Öá: T ���Y� © ¬ Z4�]�©�X � Z �?¬ T � WY®h©!Xb� � Z�®h�]_©!X�[FW � V!W � ��Wji � Wh®Y©!X�[sT�] � W � c%�¾

0

(+*10¿8s-`892k4�B$<.(�<�/¿_�(A/3-k_?bs-x06bC2$4)y$z=m (+*101À~ÁxÀ~_?bC/6(�8s-N_?bs*�0�-=4.z�(Â-=<ga"2$<?0�_?(A8s-$;7<�(�8C8C(5<�4hf�8C(+z�06/32$4w-`,"(�/�_?<<.4�(`uv/3-kz'03b92k41 − 1

e

y.*62$b90AÃ$ÄqÅ®_?(N*62$4�f�4�(+/6Bkb9( b94.bÆ03bC-$89(kES ó

Page 37: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

«sT �Ó� W � Z � [FW � � � T�®hW �âk ÞFT�Z�� � T � T�\^ßj� � W8[~¨ª]_\ � TÔ®h�qc�W � �D[FW ¬ ¨ © � [ � W2[FW � k µ\�[FT�X �D¬ W �F¬ T�X

{ r, φ}@c=Wj�;P k!k

µ\ [sT�X �L¬ W �F¬ TÔX { r, z

} Ö�7 W �L� W � Ú © � \ TÔXF®YW � [ �h� WhXF[FWhX���[FW ¬ T�\�Z ¬ ��] �F¬ ]�®Y]�� �[FWo� � T�®YW � [�W ¬ ¨ � V!ßhXFWY\ØWYXb�lô a�l"õ�ôªS�k�õ Ö

S!Q

Page 38: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

{|~}w� a Ö ô � C ®�Þ � \^T \^©!Xb� � T�Xb� ¬ W � [ � ��WY®j�WYZ ��� [�W� � T�®hW � [FW @�� Ö

{|~}w� a Ö cÇ�#OKZFWo[FW ��� ®h]�Xb�] ¬�¬ T0�WYZ ��� Wh�2[FW � �ZF«áW �H� ÞF©���©!\'Z ¬ �] ��¬ ]�®YTÔ�WhZ ��{ ®hW � ® ¬ W � WYX � ©!ZF­!Wq}[�¨ªZ�XM®h©!\ � �WYZ � [FW ¬ ZF\Ø]�XF© � ]_� � Ö

S ô

Page 39: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

{|~}w� a Ö l�� A V!© ¬ Z��]_©!X+[FW ¬ T ¬ Z�\^]_XF© � ]�� � ]�Xb� � ­ ��� W�[ �Y¬ ]�V ��� W { ®Y©!Z � «áW�[�ZMÞsTÔZ��8WYX+V!W � �@}@cáWj�WYX � WY­!] � � ��� W { ®Y©!Z � «�W [FZ «sT � WhX�« ¬ WYZ7}@c � T �o¬ WU[ � ��WY®h��WYZ � @�� T�Z#®h©!Z ��� [FZ d Z�X GÓG�Ö : W �[F]Dn �Y� WYXb�W �B�á�Y� ]_©4[�W � [�W �F� ] � W�[FW'[F©!X�X � WUTÔZ d ZFX G�G � ZF] � ©!Xb� ¬ W d Z�X G�Gac ¬ W d ZFX G�G «

1c

¬ W d ZFX G�G «2Wh� ¬ W d ZFX G�G «

3c � ©!Xb� � ­!T ¬ Wh\^WhX�� �����Y� WYXb� � W � Ö

S!c

Page 40: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

{|~}w� a Ö P k�� C ®�Þ � \^T¹[FZ [ � ��WY®j�WYZ � [�W|OKW � ��Wji ÖK7 ©!\ � © ��� [FW � ]�i��©!X�XFW T�Z=iicf[�W3[F©!Z Ü W[F] �ø� Z�W � 5 csWh�8[FW � ZsTÔ� � W[F] �T� ZFW � m�Ö

{|~}w� a Ö P!Pg� 7 ©�Z � W?� � T�X � V!W �Ó� WB[~¨ªZFXØ�©!X�XFW T�Z Ö=n XØV!©!]�� ¬ W �K� Z �F� © � � � WhX × W � ` ¬�¬ ]�ZF\¤Wh� ¬ W �� ZFTÔ� � W�®h©!ZF®�ÞFW � [�W�[ � �Wh®h��WYZ �Ó� C ] ¬ ]�®h]�ZF\

S!l

Page 41: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

-400

-200

0

200

400

-400 -200 0 200 400

y (c

m)

z (cm)

Toroid

Solenoid

21.78

12.84

21.78

20.12

20.00

20.12

21.80

12.85

21.80

1.00

0.65

0.32

0.25 .63 .39 .30 0.29 0.24 0.25

0.16

0.180.370.450.340.330.450.41

0.19

0.20

0.150.200.220.24.24.210.08

0.32

0.65

1.00

{|~}w� a Ö P�aÈ� C ®�Þ � \^TÕ[sT�X �;¬ W ��¬ T�X (x, y)[�Z¹®�ÞsT�\ � \ TÔ­!X � ��] � ZFW�®YWYXb� � T ¬ WYX#Ù à c~[FT�X �

¬ WB[ � �Wh®h��WYZ � @��ÅÖ

��W���W � W_� WKø'�Øö�û�ù ø'+�ù ø4ÿ�÷�� ögø=�Íý ø4ö1� ögø3/áø�÷ � ø��: W � [ � ��WY®h��WYZ �Ó� [�W � ]�WY[ � [FW ­!W � «�W � ôªSba"õ·ôªS�SKõ � W � ]_�Z�WYXb��WYXb� � W ¬ W�� � T�ÒÓWY®j�©!­ � T � Þ�WØWj�

¬ Wo®YT ¬ © � ]�\Øßh� � Wdc { V�©!] � As­!Z � W�a Ö ô } ÖsG ¬_�8� W � V!WYXb� kج ]�\Ø]_�W �H¬ T [ � ­ � T�[sTÔ��]�©!X+[FW ¬ TU\ØW � Z � W�[FW¬ ¨ � XFW � ­!]_W � T ��¬ W ® T ¬ © � ]�\Øßh� � Wdc k ®YT�Z � WÕ[FW ¬ ¨ T�]_\ TÔX���®hWYXb� � T ¬ ÖgG ¬���� W � \ØWh����WYXb� � ­bT ¬ Wh\^WhXb�[�¨ ]�[FWhX���]DAsW �;¬ W �B� T � �]_®YZ ¬ W � WYX T�XsT ¬ ` � T�Xb� ¬ W � \ � ®YT�XF] � \ØW � [FW�[ � V�W ¬ © �F� Wh\^WhXb�[FW'­!W � «áW �[FW � ÞsT�[ � ©!X � [�¨ ZFXFW � T � �qc�Wj�;[FW �;�h¬ WY®j� � ©!X � Wj� � ÞF©��©�X � [�¨ªT�Z�� � W � T � � Ö�: W � [ � �Wh®h��WYZ �Ó� [FW� ]�Wh[ � [FWo­!W � «áW �?� ©�X��8®h©!\ � © �Ó�Y� [FW � ] � �W � [FW � ®h]�Xb�] ¬�¬ T0�WYZ ��� � � ]�T�XF­!Z ¬ T�] � W � c=®hWh�Ó�W­ � ©�\ ��ã� � ]�W;© � �]_\^] � W ¬ T ���h� © ¬ Z��]_©!X � Z �2¬ T � © � ]��]_©!X Ö4: W � As« � W �?� ©!Xb�?®h©!\ � © �Ó� W � [�W ��¬ T � �] � ZFW;[FW� © ¬ ` � � ` � ßhXFWdc�[FW � T � TÔ��W ��� Þ � Xb` ¬ä{ P � }�Wh�8[FWØP ó k �F� \ T�Z�[�` � Þ � Xb` ¬g� ��] ¬ «�ßhXFW Ö�: W �8� ] � �W �� ©!Xb�D� � TRV�W �Ó��� W � WYX ¬ WhZ � ®YWYXb� � W � T � ZFXFW·As« � W � ®h]�Xb�] ¬�¬ T�Xb�W�â :gC { âÑT V!W : WYXF­Ô�Þ C ÞF]_Ú{��]�XF­g}� ZF]Ä� � T�X ��� © � �W ¬ T ¬ ZF\Ø]�ß � W�V!W ����¬ ¨ �Y¬ WY®h� � ©!X�] � ZFW'[FW ¬ WY®h��Z � W Ö�: W � [ � ��WY®j�WYZ ��� [FW � ]�Wh[ � [FW­!W � «�W � ©!Xb�?ZFXFW �Y� T�] ��� WYZ � [FW P Ö SXo

0

Ö@ T�X �2¬ T ��� ­!]�©�XÕ®YWhX�� � T ¬ WBWYX � T � ]�[�]_� � |ηdet| < 1.3

c ¬ W;[ � ��WY®h��WYZ � { 7 Ý C | 7 WYXb� � T ¬ Ýf� W C ÞF© ãµHW � }KW � �HZFXÕ®j` ¬ ]�XF[ � W ¬ ©!XF­�[FWoa Ö Q�\ ®h©!Z�V � TÔX�� ¬ ¨ªT�]�\^T�Xb� � © ¬_� XF©Kj [sT ¬ Ö�: W 7 Ý C ®Y©�X � ] � �W;WYX� � ©!] � ®h©!ZF®�ÞFW � [�W � ] � ��W � � � ] T�X�­!Z ¬ TÔ] � W � c ¬ ¨ ZFXFWBÚ ©!Z � XF] ��� TÔX�� ¬ T'\^W � Z � W ¬ ©!XF­�]_�Z�[F]�XsT ¬ Wdc ¬ W � aT�Z�� � W � Ú © � \ TÔX��KZ�X T�X�­ ¬ W � � �Y�Ó� ©�WYXb� � WeW ¬�¬ W � c � W � \^Wj����TÔX�� ¬ T � WY®h©!X � � � Z�®h�]_©!X [�W � ©!]_X�� � WYX� � ©!] � [�]�\ØWYX � ]�©!X � Ö@ T�X ��¬ T ��� ­�]�©!X�[FW � «�©!Z�®�ÞF©!X � c ¬ W � [ � �Wh®h�WhZ ���v{ 5 Ý C | 5 © � µHT � [ ÝK� W C Þ�©�µLW � }�®Y©!Z4V � WYXb�¬ T ��� ­!]�©�X 1.5 < |ηdet| < 2.5

Ö�G ¬���� ©!Xb�lA4i �h��� Z ��¬ T � T � ©!]f[FZ ® T ¬ © � ]_\^ßj� � WU«á©!ZF®�Þ�©!X Ö�G ¬��� ©!Xb�8®Y©�\ � © ���h� [FW � ZsT0� � W®h©!ZF®�ÞFW � cá[FWYZ4i � ]_��Z � W � WhXET�\Ø©!Xb�?[�¨ ZFXFW�®Y©!Z�®�ÞFW�[FW � T�[F] T0�WYZ �WYX �F¬ ©!\�«!c � Z�] � W � \^Wj���WhXb� ¬ T�\ØW � Z � We[FW ¬ ¨ � XFW � ­!]�W?[�¨ ]�©!X�] � T0�]�©�XØ[�W ¬ T � T � �]_®YZ ¬ WdcbWh�H[FWYZ=iT�Z�� � W �f� ]_��Z � W � [FW �Ó� ]�ß � W �D¬ W � TÔ[F] TÔ��WYZ � c � ZF]F\ØW � Z � WhXb� ¬ ¨ªW�i=�WYX � ]�©�XØ[�W ¬ TB­!W � «áW2]�XF]��] � WH[sTÔX �¬ W ��¬ ©!\'« Ö

� k

Page 42: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

�Bø�÷���üá÷�� õ��;+!øEögø�� ögûbùRø�+�ùRø=ÿ�÷��^ö�ø3�Íýwø=ö1�^ö�ø3/�ø�÷ � ø��: W �e� W � Ú © � \^T�XF®hW � [FW�®YW � [ � �WY®j�WhZ ���e� ©!Xb� � VÔT ¬ Z � W �8� Z �8¬ W � ©!Z�V�©!] � [�¨ ]�[�WYXb�]BAs® TÔ��]�©!X+[FW ��Y¬ Wh®h� � ©!X � Wj� � Þ�©��©!X � Wj��[�W �Ó�Y� T � TÔ��]�©!X �Y¬ WY®h� � ©!XX� � ]�©�X Ö Ý ©�Z � ZFXFWØW C ® T�®h]_� �^� Z ���h� ]_WYZ � Wk l!k � ZFXFW �Ó� ÒÓWY®j�]_©!X [�¨ ZFX¹ÚwT�®h��WYZ � a k SÕW � �o©!«���WYX�ZFW � Z �;¬ W �;� ]�©!X � Ö~7 W'ÚwT�®h��WYZ � [�W � W ãÒÓWY®h��]�©!X � ¨ T�ÒÓ©�Z��W k ®YW ¬ ZF] ©!«���WYX�Z�WYXEZ4�] ¬ ] � T�Xb� ¬ T'Ú © � \^Wo[�W ¬ T'­!W � «�W � WY®Y©�X � � � ZF]��W�[sT�X �?¬ W® T ¬ © � ]_\^ßj� � W � WYZ ¬ ÖF7 Wj����W � W � Ú © � \ TÔXF®YW � W;� � T�[�ZF]_�c k W C ® TÔ®Y]_� � [FW ���Y¬ WY®j�]�©�X [FW ���Y¬ WY®h� � ©!X �®Y©!X � ��T�Xb��Wdc � T � Z�XFWØT�\ �h¬ ]_© � TÔ��]�©!XM[FZ � W ÒÓWh��[FW � ÒÓWj� � ]�[FWhXb�]DA �Y�o� T � W ��� WhZ � ®Y©�\^\ØW �Y¬ WY® ã� � ©�X � | ¬ ¨ Z��] ¬ ] � TÔ�]_©!X [FW �H�F����ã � ®�ÞFT�Xb�] ¬_¬ ©!X�XFWYZ �Ó� [Fß �2¬ W �F� Wh\^]_W � X�]_V!WYT�Z3[FWB[ � ® ¬ WYXF®�Þ�WY\ØWYXb�WYX T ��� ©4®h] TÔ��]�©!X�Ú ©!Z � XF]_� � T � Wji4Wh\ �F¬ W'ZFXFW �Ó� ÒÓWh®h�]_©!X¹[�¨ ZFX¹ÚwT�®h��WYZ �;� Z �á�Y� ]�WYZ �mk a [FWeÒÓWh� �]�[FWhX���]DA �h� ÚwTÔZ ��� WY\ØWYXb�Õ®h©!\^\ØW �Y¬ WY®j� � ©�X � ®h©!\ � T ���vk�¬ ¨ªZ � T�­!W+[FZ,® T ¬ © � ]_\^ßj� � W � WYZ ¬ ô S � õôªS ó õ Ö

�5W_��W � W � WDø=+!õ��wü�÷0ý��Û4bùR÷�ø: We® T ¬ © � ]_\^ßj� � W ô S!Q�õ � W � \ØWh�L[FWB\ØW � Z � W �H¬ ¨ � XFW � ­!]�W8[FW � ©!«=ÒÓWj� ���h¬ WY®j� � ©!\ TÔ­!X � ��] � ZFW � Wj�[FW � ÞsTÔ[ � ©!X � cFTÔ]�X � ] � ZFW ¬ ¨ � XFW � ­!]�W8� � TÔX � V�W ��� W\ T�X � ZFT�Xb�W Ö�G ¬~� W � \ØWh� � ­bT ¬ WY\ØWYXb� ¬ ¨ª]_[FWYXb��] ãAs® TÔ��]�©!X^[FW �H�Y¬ Wh®h� � ©!X � c � ÞF©��©�X � Wh��ÒÓWh� � c=Wh��] ¬�� T � ��]�®h] � W k�¬ T�[ � �Wh®h��]�©!XÕ[�W � \'Z�©!X � Wj��[FW �XFWYZ�� � ]_XF© � ÖNoZFT�XF[ ¬ W �U� T � ��]�®YZ ¬ W � � � T V!W ��� WYXb� ¬ W�®YT ¬ © � ]�\Øßh� � WKcÍ] ¬�� ]�Xb��W � TÔ­!] �Ó� WYXb�^T V!Wh® ¬ W3\^] ¬ ]�WhZ T�« ã

� © � «sT�Xb� WYX �F� ©4[FZ�] � TÔX�� Z�XFW2>I­!W � «áWf? [FW � T � �]�®hZ ¬ W � cÍWh�Ø[ �Y� © � WYXb� � T � ®Y©�X ���~� Z�WYXb� ¬ WYZ �� XFW � ­!]_We[sTÔX � ®hW;\Ø] ¬ ]�WYZ Ö!: W � ­!W � «�W �H�Ó�Y� Z ¬ ��TÔX���W � [ �Y� WYXF[�WYXb��[FW ¬ ToXsTÔ��Z � W8[FW ¬ T � T � ��]�®hZ ¬ W]�XF®h]�[FWhX���W ÖFG ¬ W�i4] � ��W[FWYZ4i+� ` � W � [FW­!W � «�W |− ¬ W � ­!W � «�W ���Y¬ WY®j� � ©�\ T�­�X � ��] � ZFW � ©!Xb�2® ���h� W �H� T �D¬ W �L�Y¬ WY®h� � ©!X � Wh� ¬ W �L� Þ�©��©!X � Ö4: W ���Y¬ WY® ã� � ©�X �f� W � [FWhXb�H[FW ¬ ¨ � XFW � ­!]�W � T �f� T `!©�XFXFWY\ØWYXb�L®Y©!Xb��]�X�Z [FW2Ú � WY]_XsT�­!W { ©!Z × � Wh\ �Ó� � � T�Þ ¬ ZFXF­g}WYX � \ØWh���T�Xb�[FW �� Þ�©��©!X � c � ZF] �F� ©4[FZ�] � WhXb� k3¬ WYZ � ��©!Z � [FW ��� T�] � W �o�Y¬ WY®j� � ©�X �� © � ]_� � ©!X �� Z�]�V!©!Xb� � ­bT ¬ Wh\^WhXb� � \ØWh�Ó� � W�[FW �o� Þ�©��©!X � Ö�7 W �F� ©4®hW �Ó� Z ��� ¨ªT ��� rh��W � ZFT�XF[ ¬ ¨ � XFW � ­!]_W�[FW �� T � ��]�®hZ ¬ W � ® ���h� W � [FWjV=]�WYXb�?� � © � ÚwT�]�« ¬ W Ö− ¬ W � ­!W � «�W � ÞsT�[ � ©!XF] � Z�W ��� ©!Xb�2® �Ó�Y� W �2� T �L¬ W � ÞsT�[ � ©!X �â� Z�]~]�Xb��W � TÔ­!] �Ó� WYXb��TRV�WY® ¬ We\Ø] ¬ ]�WYZT�« � © � «sT�Xb�c�® �Ó� T�Xb��[�¨ªT�Z�� � W � ÞsT�[ � ©!X � ®h©!\^\ØW ¬ W �o� ]_©!X � ®�ÞsT � ­ �Y� ©!Z ¬ W �o�F� ©��©!X � c�Wj� � ZF]� W[ �Y� ]�Xb�ßh­ � WhXb� � T �2¬ T � ZF]��W Ö: W � ­!W � «�W � ÞsT�[ � ©!XF] � Z�W � Wh� �h¬ Wh®h� � ©!\^T�­!X � �] � ZFW �Õ�F� ©�V�WYXsTÔX���[FW �Ó� T�®j�]_©!X � [F]Bn �h� WhX���W � c©!Xb�2[F©!XF®;[FW � ®YT � TÔ®h� �h� ] � �] � ZFW � Wj�2XF©��T�\Ø\^WhX��H[FW � Ú © � \ØW � [F]Dn �Y� WYXb�W � Ös: T m ã N TÔ� � ] iic=®hÚ ÖS Ö S�csW � � � T � Wji4WY\ �F¬ WoZFXFWV�T � ] TÔ« ¬ W � Z�]��]�WhXb�?®Y©!\ � �Wo[�W � ]�X�Ú © � \ T0�]�©�X �L� Z �?¬ T�Ú © � \^Wo[�W¬ T ­!W � «áW � ©�Z � [F] � �]_XF­!ZFW �B¬ W � ©!«=ÒÓWh� �o�Y¬ WY®h� � ©!\^T�­!X � �] � ZFW � [FW � ©!«=ÒÓWj� � ÞsT�[ � ©!XF] � Z�W � Ö�: W �­ � T�X�[FW � [F]Dn �Y� WYXF®hW � WYXb� � W ®YW � [FWhZ4i � ` � W � [FWØ­!W � «�W � ©!Xb� ¬ W ��� Z�]_VÔT�Xb�W � | ¬ T+­!W � «�WØÞsT ã[ � ©!X�] � ZFWoT�Z�XFWoWji=�WhX � ]_©!X ¬ ©�XF­!]_��ZF[F]_XsT ¬ W?Wj��� � T�X � V�W �Ó� T ¬ W �F¬ Z � ]�\ � © � ��TÔX���W � ZFW ¬ T�­!W � «áW�Y¬ Wh®h� � ©!\^T�­!X � �] � Z�W:�4Wj� ¬ T�­!W � «�W �Y¬ Wh®h� � ©!\^T�­!X � �] � Z�We®h©!\^\ØWYX�®YW ��¬ Z � � S ��[FT�X ��¬ W;® T ¬ © � ] ã\^ßj� � W Öb: W � � � ZF®h��Z � W8[FZ ® T ¬ © � ]�\Øßh� � W�[FW @�� WYXØZFX^®YT ¬ © � ]�\Øßh� � W �h¬ Wh®h� � ©!\^T�­!X � �] � ZFW � ZF]�V4][�¨ªZ�XM®YT ¬ © � ]�\Øßh� � W;ÞFT�[ � ©�XF] � ZFWW � �8[F©!XF®HÒÓZ � �]DA � W Ö: WE® T ¬ © � ]_\^ßj� � W+[FW @£� W � �3ZFX*®YT ¬ © � ]�\Øßh� � W k � ®�ÞFT�Xb�] ¬_¬ ©!X�XsT�­!WKcLWhX*W~n�Wh�+®�ÞsT � ZFW¹\Ø© ã[FZ ¬ W#®h©!\ � © �Ó� [�W [�WYZ4i1®hW ¬�¬ Z ¬ W � c2W � ��ZFXFW�T ¬ ��W � XsT�XF®hW WhXb� � W ¬ W#\Ø] ¬ ]�WYZ�T�« � © � «áWYZ �5{w� T®Y©!\ � © � ]_��]�©!XM[ �Y� WYX�[ [�W ¬ T � © � ]��]�©�XE[FW ¬ TÕ®YW ¬_¬ Z ¬ W�[FT�X �¬ W�® T ¬ © � ]_\^ßj� � Wq}8[sTÔX �o¬ W � Z�W ¬Ä� W[ � V�W ¬ © �F� WhXb� ¬ W � ­!W � «�W � cFWj� ¬ W;\Ø] ¬ ]�WhZÕT�®j�]_Ú.c=[sT�X �2¬ W � ZFW ¬~� WB� � ©�Z�V!WoZFX�W �Y¬ Wh®h� � ©=[FWB[FW ¬ WY® ã�Z � W2WYXØ®YZF]�V � Wdc!]_©!XF] � T�« ¬ W � T �f¬ W �f� T � �]_®YZ ¬ W � Wj�K®Y©!\ � © ��� W8[~¨ T � ­!©!X ¬ ] � ZF]�[�WdcÔV�©!] � AF­ Ö a Ö PRS Ö

� P

Page 43: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

: WU®�ÞF©!]�i [FW ®YW [FW � XF]_W � W � ��\^©���]_V � WYXb� � WØT�Z�� � W �� T �o¬ T � ]_\ �F¬ ]�®h]_� � [FW ¬ ¨ � ��T ¬ ©!XFXsT�­�Wdc~Wj�� ©�Z �f� T ���Y� ] � ��T�XF®hW;TÔZ4i � TÔ[F] TÔ��]�©!X � Ö�7 W �L� T�] � ©!X � ®Y©!Xb� � WY«FT ¬ T�X�®YWYXb� ¬ ¨ ]�XF®h©!XbV � XF]�WhX��D[�¨ªT V!©!] �¬ WÕ[ � �Wh®h��WYZ � WYX�Ú W � \ � [sT�X � [FW � ® � `�© � �TÔ� � ®Y©�\ �F¬ Wji4W � cÄ\^T�]�Xb�WhX�Z �#k ZFXFW3�Wh\ �á�Y� TÔ�Z � W�F� ©=®�ÞFW[FW�l!kØÙ Ö�: W � ��©!Z ���?� ©!Xb�;[ � AsXF]_W �8� T �?¬ ¨ WY\ � ] ¬ WY\ØWYXb�2WhX �F� ©�Ú ©!XF[FWhZ � [FW � ®YW ¬�¬ Z ¬ W �� ©�Z � ZFXU®h©!Z �F¬ W { ηdet

cφ}Í[F©!XFX � c!W ¬�¬ W �Ä� W � V�WYXb�LT�ZU[ � ® ¬ WhXF®�ÞFWY\ØWYXb�DWh� kB¬ T � Wh®Y©!X � � � ZF®h��]�©!X Ö: WØ®YT ¬ © � ]�\Øßh� � W�W � ��®Y©�\ � © ��� [FWU� � ©!] �o� T � ��]�W ��� WØ� � ©!Z4V�TÔX���®�ÞsTÔ®YZFXFWØW � ��[FT�X � ZFX�® � `�© ã

� �TÔ� | ¬ T ��� ­�]�©!XU®hWYXb� � T ¬ W { 727 � ©!Z � 7 WhX�� � T ¬ 7 T ¬ © � ]�\ØWh�W � }@c ¬ W �f��� ­!]�©�X � T VÔT�Xb�K®Y©!X � �]��Z � W �[FW[FWYZ=iE«á©!ZF®�Þ�©!X � ]�[FWhX���] � ZFW � J © � [�Wh� C ZF[ { AD7 � ©!Z � A XF[ 7 T ¬ © � ]�\ØWh�W � }@c�Wh� ¬ T �Ó� ­!]_©!X]�Xb�W �Ûã ® � `�© � �TÔ� { GÛ7�d � ©!Z � G Xb��W � 7 � `!© � ��T0� d WY­�]�©!X7}@c�V!©�] � As­ Ö a Ö P �FÖ

� a

Page 44: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

{|~}w� a Ö PRSÇ� C ®�Þ � \^T�[�¨ ZFX3\Ø©4[FZ ¬ W8[FZÕ® T ¬ © � ]�\Øßh� � Wdcb] ¬ W � �2®h©!\ � © �Ó� [FWe[FWYZ=i3®YW ¬�¬ Z ¬ W � Ö=: T®YW ¬_¬ Z ¬ WBW � � ¬ ¨ �Y¬�� \^WhXb�?[FW«sT � W[FZ�® T ¬ © � ]�\Øßh� � W Ö

{|~}w� a Ö P � � : W � � � ©!] � ®YT ¬ © � ]�\Øßh� � W �m{ ®hWYXb� � T ¬ Wh�8«á©!ZF®�ÞF©!X � }Û[�W @�� [sT�X �?¬ WYZ �Ó� ® � `�© � �TÔ� � Ö

� S

Page 45: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

WDøÿ+!õ�� ü�÷Ôý��Û4bùR÷�ø5+!ø'�áùR÷�õ��ÊÉ�� �ÊË | ] ¬ ®Y©!Z�V � W ¬ T �Ó� ­!]_©!X |ηdet| < 1.1c [FW Ú © � \^W ®h` ã

¬ ]_XF[ � ] � ZFWdc�] ¬ T ZFXFW ¬ ©!XF­!Z�WYZ � [�W a Ö a�QÕ\ Wj�ZFX � T `�©!X#]�Xb�W � XFW { Wji=�W � XFWq}B[FWUk Ö ô!ó { a Ö a!ad}\ Ö�: W 727 ®Y©!\ � © � ��W8� � ©!] � ®h©!ZF®�ÞFW � | �F� Wh\^]_ß � WY\ØWYXb�H©�X^� � ©!Z�V�W ¬ T®Y©�ZF®�ÞFW �h¬ WY®j� � ©!\ TÔ­!X �jã�] � Z�W { ® T ¬ © � ]_\^ßj� � W ADN }fc ¬ T �F¬ Z ��F� ©=®�ÞFWØ[FZ � ©!]_Xb�[�¨ª]_Xb�W � T�®h��]�©!Xic ¬ WU\Ø] ¬ ]_WYZ#T�« � © � «�WhZ �[FW � ®YW ¬_¬ Z ¬ W � W � � ®h©!\ � © �Ó� [FW ��¬ T � ZFW � [�¨ Z � T�X�]�ZF\¼T �F� TÔZ�V � ]H[�W+SE\^\µ[�¨ �Y� TÔ] ��� WYZ � Öf: W® T ¬ © � ]_\^ßj� � W ADN W � �2WhXF®Y© � W � Z�«�[F]�V=] ��� WYX � ZsTÔ� � W � ©!Z �Iã ®Y©�ZF®�ÞFW � [~¨ �h� T�] �Ó� WhZ � P Ö�� cFa Ö k]c4Q Ö cWh�'l Ö cvo0cg[FW ¬ T �F¬ Z ���F� ©=®�ÞFW kM¬ T �F¬ Z ��¬ ©!]�Xb�T�]�XFW [FZ � ©!]_X���[�¨ ]�Xb�W � T�®j�]�©�X��g[�WYZ4i4]�ßh\^W ã\^WhXb�?©!X3� � ©�Z�V!W ¬ T'®h©!ZF®�ÞFW�ÞsT�[ � ©!XF] � ZFW�AsXFW { ®YT ¬ © � ]�\Øßh� � W 5�m }fc ¬ WB\Ø] ¬ ]�WYZÕT�« � © � «áWYZ � W � �®Y©!\ � © ��� [FW ��¬ T � ZFW � ®Y©�X � ��]_�Z � W � [�¨ ZFXUT ¬_¬ ] TÔ­!WÄZ � T�XF]�Z�\ ã XF]�©!«�]�ZF\ { a � }�[FW�Q8\^\ï[�¨ �Y� T�] �Iã

� WhZ � Öá: W�®YT ¬ © � ]�\Øßh� � W 5�m ®h©!\ � © � �Wo� � ©!] �2� ©!Z �Iã ®Y©�ZF®�ÞFW � [�¨ �h� T�] ��� WhZ � P Ö S'cgP Ö k Wh�ek Ö l#o0�

� � ©!] � ]�ßY\ØWY\ØWYXb�H©!X3� � ©�Z�V!W ¬ T'®h©!ZF®�ÞFW�ÞsT�[ � ©!XF] � Z�Wo­ � © �Ó� ]_ß � W { ® T ¬ © � ]_\^ßj� � W 7�m }@c ¬ Wo\Ø] ¬ ]�WYZT�« � © � «áWYZ � W � �B®h©!\ � © �Ó� [�W �F¬ T � ZFW�[�W�®hZF]_V � W�[FW � Q Ö ó \Ø\°[�¨ �Y� T�] ��� WYZ � Ö~: W�® T ¬ © � ]_\^ßj� � W7�m XFW � © �Ó� ßh[FW � Z�¨ ZFXFW�®Y©�ZF®�ÞFW�[�¨ �h� T�] ��� WhZ � S Ö aXo0

Ö: W � ®hW ¬�¬ Z ¬ W � [FW � [F]Bn �h� WYXb��W � ®Y©�ZF®�ÞFW �+� ©!Xb� � Wh­!\^WhXb� � W � WYX ∆ηdet × ∆φ = 0.1 × 0.1

cTKAsX [FW+®Y© ��� W ��� ©!XF[ � W k¹¬ TE��T�] ¬�¬ W^[FW � ­!W � «áW �Ø�Y¬ WY®h� � ©!\^T�­!X � �] � ZFW �v{ P ã aE®h\|}�Wj�^ÞFT�[ � © ãXF] � ZFW �5{ ∼ PRk ®Y\2} Ö87 Wh�Ó�W � Wh­!\^WhXb��TÔ��]�©!X � W � \ØWh� � T � W�i4WY\ �F¬ W#[FW#[ � �W � \^]_XFW �+¬ T XFT ã�Z � W�Wj� ¬ T Ú © � \ØW�[�W � ÒÓWj� �8� T � �©!XF] � ZFW � cá� ` � ] � Z�WY\ØWYXb�B®h©!Xb�WYX�Z � [sT�X � ZFXE® S XFW�[FW � T `!©!X∆R =

∆η2det + ∆φ2 ' k Ö ó4Ö : TÕ� � ©!] � ]�ßh\^W�®Y©!Z�®�ÞFW^[�Z ®YT ¬ © � ]�\Øßh� � W �Y¬ WY®h� � ©!\^T�­!X � �] � ZFWW � � �F¬ Z � AsXFWh\^WhX�� � Wh­!\ØWYXb� � W ∆η × ∆φ = 0.05 × 0.05

cs®YT � ®�¨ W � � ¬�k ©^z ¬ W � ­�W � «áW �8�Y¬ WY® ã� � ©!\ TÔ­!X � ��] � ZFW � [ �Y� © � TÔ]�WYXb� ¬ W+\^T0i4]�\'ZF\¼[FW ¬ WYZ �Ø� XFW � ­!]�W�[FZ � T�Xb� ¬ W d Z�X G�Ö Ý ©!Z �^¬ Wd Z�X GÓG c ¬ ¨ TRÒÓ©!Z��8[FW ¬ ¨ TÔ]�\^T�Xb� � © ¬_� XF©Kj [sT ¬ Wo[�¨ ZFXFW �h� T�] ��� WhZ � [FW �F� ß � [FW'k Ö l�o0T WYZ � ©�Z �®Y©!X ���� ZFWhXF®YW � ZFW ¬ W � ­!W � «áW �U� W3[ � V!W ¬ © ��� WhX�� �F¬ Z � � S �qcÍ[ �Y� © � TÔX�� [�©!XF® �F¬ Z � [�¨ � XFW � ­!]_W[sT�X �;¬ TÕ[FWhZ4i4]�ßY\ØW'®h©!ZF®�ÞFW [FZ#® T ¬ © � ]�\Øßh� � W Ö�7 ©!\Ø\^W�\^WhXb�]�©�XFX � WhX a Ö a Ö S Ö a�c ¬ ¨ TRÒÓ©!Z��B[�W �5 Ý C Wh� 7 Ý C T�Z d ZFX GÓG � ©!Xb� � ­bT ¬ WY\ØWYXb�?\Ø©��]�V �Y�2� T � ®YW � ]_XF®Y©!XbV � XF]_WYXb� � Ö

WDø��v+!õ��wü�÷0ý��Û4bùR÷�ø'� � ü�ÿ1+0úgü�1�®É+Ì��ÊË | ] ¬�� ®Y©!Z�V � WYXb� ¬ T ��� ­!]�©�X 1.5 < |ηdet| < 4.0Ö

] ¬_��� ©!Xb� � ­!T ¬ Wh\^WhX��?®h©!X � �]_��Z �Y� [FWo� � ©!] � ®Y©!ZF®�Þ�W �l{ ADN c 5Äm Wh� 7�m } |− ¬ T^®h©!ZF®�ÞFW ADN k2� ZsTÔ� � W � ©�Z �Ûã ®Y©!ZF®�Þ�W � [�¨ �Y� T�] ��� WYZ � [FW P Ö Q'c�a Ö Q]c ô4Ö l^Wh�l Ö S<o

0

Ö~: ¨ T�« ã� © � «�WhZ � [FW ¬ T �F� WY\Ø]�ß � W ®h©!ZF®�ÞFW3W � � WhXÑÚ W � cÍWh�U®hW ¬ ZF]H[FW � � � ©!] � T�Z�� � W � W � �UWhX Z � T�X�]�ZF\T �F� TÔZ�V � ] Ö− ¬ T � T � �]�WeÞsT�[ � ©!XF] � Z�WoW � �?[�]_V=] �Ó� WBWhX+� � ©!] ��� Wh®h��]�©!X � | ZFXFW � WY®h��]�©!X+]_X���W � XFW � ZF]�®h©!\ � �W� ZsTÔ� � W � ©!Z �Ûã ®h©!ZF®�ÞFW � 5�m T V!WY®Ø[FW � T�« � © � «áWYZ �Ó� WhX#Z � T�X�]�ZF\ T �F� T�Z4V � ]Ä[FW ¬ ©!XF­!ZFWhZ � P Ö PλA

{ λAW � � ¬ T ¬ ©!XF­�ZFWYZ � [�¨ªT�« � © ��� ��]�©!X�}fcbWh�LZFXFW � ©!Z �Ûã ®h©!ZF®�ÞFW 7�m T V!Wh®;[FW � T�« � © � «�WhZ ��� WYX]�XF© i+[�W ¬ ©!XF­!ZFWhZ � �FÖ P λA

��ZFXFW � Wh®h��]�©!X�\ � [F] TÔXFW�TRV�WY® � ZFTÔ� � W � ©!Z �Ûã ®Y©!Z�®�ÞFW � 5�m \�ZFXF]�W �[�¨ªT�« � © � «áWYZ �Ó� [FW ¬ ©!XF­!Z�WYZ � k Ö l λAc�Wh��ZFXFW � ©!Z �Iã ®Y©�ZF®�ÞFW 7�m [�¨ TÔ« � © � «�WhZ � [FW ¬ ©!X�­!ZFWYZ ��FÖ��

λA� Wh�WYX'AsX�Z�XFW � WY®j�]_©!X#Wji=�W � XFW Ú © � \ � W�[FWU� � ©�] �B� ©!Z �Ûã ®Y©!Z�®�ÞFW � 7�m TRV�WY®Ø[FW � T�« ã

� © � «�WhZ ��� WhXM]_XF© i3[FW ¬ ©�XF­!ZFWhZ � Q Ö k λAÖ

: T � Wh­!\^WhXb��TÔ��]�©!XÕ[�WB�©!Z���W ��¬ W � ®h©!ZF®�ÞFW �?� T�Z�Úg®hW ¬�¬ W;[FW ¬ T�� � ©!] � ]�ßh\^W � ©�Z �Ûã ®Y©!ZF®�Þ�W ADN W � �[FW∆ηdet × ∆φ = 0.1 × 0.1

Öá: T^­ � T�X�Z ¬ T � ]�� � [FW ¬ TU� � ©!] � ]�ßY\ØW � ©!Z �Ûã ®h©!ZF®�ÞFW ALN W � � �F¬ Z �AsXFWWh�?VÔT�Z��∆ηdet × ∆φ = 0.05 × 0.05

Ö

WDõÑ÷�ûg/áýwü�*ý���ùRø�÷ ��+!÷§$áü�hùRõ�ùÍÉøER�HG[Ë | W ¬�¬ Wo®Y© �Ó� W �Ó� ©�XF[ k^¬ T Ü ©!XFW�XF©!XM®Y©!Z�V�W � �W � T �¬ W?® T ¬ © � ]�\Øßh� � W �Y¬ WY®j� � ©�\ T�­�X � ��] � ZFW2Wh�LW ¬_¬ W?W � �L� � ß �L� WYZ^]�X � � � Z�\^WhX�� � WKc 1.1 < |ηdet| < 1.5

Ö6 AsX�[�¨ªT�ZF­!\ØWYXb��W �g¬ ¨ ÞFW � \ � �]�®h]_� � [FZ�®YT ¬ © � ]�\Øßh� � WÄ[FT�X � ®YWh�Ó�W ��� ­�]�©!X!cY[FW � [ � ��WY®h��WYZ �Ó� ]_X���W �Iã

�^�

Page 46: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

® � `�© � �TÔ� { GÛ7�@ | G Xb�W � 7 � `!© � ��TÔ� @ Wj�Wh®h�© � }LWj� N T �Ó��¬ W ��� à T �,{ N à }K©�X�� � � � ]�X � ��T ¬_¬��h� ô S ô õôªS!c"õ Ö?G ¬_��� W � \^Wj����WYXb�MT�]�X � ]o[�¨ªT�\ �h¬ ]_© � W �Õ¬ T \ØW � Z � W#[FW ¬ ¨ � XFW � ­!]_W¹[FW � ÒÓWh� � c?Wh�M®YW ¬�¬ W¹[�W¬ ¨ � XFW � ­!]_W?� � T�X � V!W ��� WB\ TÔX � ZsT�Xb�W Ö�: ¨ �Y� T�] ��� WYZ � [FW � \ TÔ� �Y� ] T�Z4i'[sT�X �L¬ ¨ GÛ7�d W � �H[FW�P Ö Peo

0

Ö

• ¬ W � [ � �Wh®h��WYZ �Ó� GÛ7�@ ®Y©�Z�V � WYXb�e�©!Z���W ¬ T ��� ­�]�©!X 1.1 < |ηdet| < 1.5c { V!©�] � As­ Ö a Ö P ó } Ö: WYZ �Ó� �F¬ T � ZFW � [FW � ®Y]�Xb��] ¬�¬ TÔ�WhZ ��� Wj� ¬ ¨ �h¬ WY®j� � ©!XF] � ZFW+©!Xb� WYXb�]_ß � Wh\^WhXb� � � �E� WhÚwT�]��W �

� ©�Z ��¬ W d ZFX GÓG�ÖÍG ¬_��� ©�X��HA�i �Y�U� Z ��¬ T�ÚwT�®hWÕWji=�W � XFW [FW � ® � `�© � �TÔ� � [�W � «á©!ZF®�ÞF©�X �T�Z���©!Z � [FW � 5 Ý CáÖ�C Z � ®�ÞsT � ZFW�«á©!ZF®�ÞF©!Xic ¬ ¨ GÛ7�@ � W®Y©!\ � © � Wo[FW PRQ���ZF] ¬ W � c�®�ÞsT�®YZ�XFW®Y©!Z4V � W ZFXFW ��� ­�]�©!X,WYX ∆ηdet × ∆φ = 0.3 × 0.4ÖH7 ÞsT � ZFWE��ZF] ¬ WMW � �3[F]�V=] ��� WEWhXP�a � ®Y]_X���] ¬_¬ TÔ��WYZ �Ó�H� ZF]L®Y©!Z�V � WYXb�U®�ÞsT�®hZFX ZFXFW Ü ©!XFW ∆ηdet × ∆φ = 0.1 × 0.1

Ö�: W �� ®h]�Xb�] ¬�¬ T0�WYZ ���~� ©!Xb� � W ¬ ] �h��k [FW � �ZF«áW ��� Þ�©��©!\�Z ¬ ��] �F¬ ]�® T0�WYZ ���á� T � [FW � ­�ZF]�[FW � [�¨ª©�XF[FW Ö

• ¬ W � [ � �Wh®h��WYZ �Ó� N T �Ó��¬ W ��� à T ���8� ©!Xb�B[FW � ]_\ ��¬ W � ®hW ¬_¬ Z ¬ W �?� T�X �e�F¬ T � ZFW � T�« � © � «áWYZ ���{w¬ WYZ �Ó�f� T � ©�] �Ä� W � VÔT�Xb�D[�¨ªT�« � © � «áWYZ � } Ö�A ¬�¬ W �f� ©!Xb� ��¬ ©!XF­ � W � [FT�X �K¬ ¨ªT � ­�©!X ¬ ] � Z�]�[FWKc � Z �¬ T�ÚwT�®hW]�Xb�W � XFW[FW � ® � `�© � �TÔ� � [FW � ®YT ¬ © � ]�\Øßh� � W � 727 Wh� AD7;Ö

�;ø=÷"� ü�÷�� õ��1+!ø ögÿ +!õ�� ü�÷Ôý��Û4bùR÷�ø: W �?� W � Ú © � \ T�X�®YW � [FZ+®YT ¬ © � ]�\Øßh� � W � ©!Xb�8� � T�]�� � W � [sT�X �8¬ T � WY®j�]_©!X ô4Ö l Ö

Ì£�wø�+�ùR÷�ü�Íýwþ�ÿ�ø�öÍÿ +!õ�� ü�÷0ý&�Û4bùR÷�ø: ¨ �Y¬ WY®j� � ©�XF] � ZFW [FZ ® T ¬ © � ]_\^ßj� � W�W � ��[ � ®Y©�Z ��� W^WhX,PRa+®�Þ�� ��� ] � ©�Z ® � TÔ��W �2{ V�©!] � As­ Ö a Ö P Q^} Ö7 ÞsT � ZFWÕ®�Þ�� ��� ] � T P�a+® T � �W � 6B@o7 { 6 XsT ¬ ©!­M��© @ ]_­!]_�T ¬ 7 ©!XbV!W � ��W � } � ZF]L[F]�­�]_��T ¬ ] � WYXb� ¬ W� ]�­�XsT ¬ [FW�[ �h� ]_V�W+[FW �Ø�Y¬ WY®h� � ©!X � [~¨ª]_©!XF] � TÔ�]_©!X ÖÄ7 ÞsT � ZFW�® T � �W 6B@o7 ®h©!\ � © � �W+c#® T � �W �×�:gC { × T � W : ]�X�W C ZF«�� � T�®h��]�©!X�} � Z�] � ©!Z � � � TÔ]�WYXb� ¬ T � ZFWhZFWe[�Z � ]_­!XsT ¬ WYX � WY­!] � � �Ó�?¬ © �Ó� [�¨ªZ�XFW�F��� ® � [�WYXb�W�®h© ¬�¬ ] � ]�©!X { [F]_�g«sT � W ¬ ]�XFWq}fcR[FZ � ]�­!XFT ¬ \^W � Z �Ó� ÖÔ: W � ×�:gC � WL®Y©!\ � © � WhX��Í[FW � ZFTÔ� � W�©!Z �Ó� [�¨ �Y¬ WY®h� � ©!X�] � ZFW � ©!Z�VÔT�Xb�TÔ®Y®YZ�WY] ¬_¬ ] � PRaØV!©!]_W � [�W ¬ Wh®h�Z � W � ©!Z ® TÔXsT�Z4i Ö�6 ZE�©��T ¬ ©!X®Y©!\ � �W ó!ó a�l!Q�V�©!]�W � [FW ¬ Wh®h�Z � W �L� ©�Z �L¬ We®YT ¬ © � ]�\Øßh� � WKc!\ TÔ] �K� WhZ ¬�� ��ô k!S!a � ©�X��HZ��] ¬ ] ��� W � Ö7 ÞsT � ZFWØ® T�XsT ¬ W � ��[�©!XF® � W ¬ ] �Xk ZFX#®h] � ®hZF]_� �h¬ Wh®h� � ©!XF] � Z�Wdc � W � \^Wj����TÔX��[�W ¬ ] � W ¬ W � ]�­!XsT ¬ cWh�e[F©!Xb� ¬ W �8�Y¬�� \^WhXb� �;��� ]�X�®Y] � T�Z4i � ©�X��eZFX ����� TÔ\ �F¬ ]DAs®YTÔ�WhZ � csZ�X \^©=[FZ ¬ TÔ�WhZ � [FW�Ú © � \ØWdcZFX ×H:ÍC Wj�eZ�X 6;@o7 c { V!©�] � As­ Ö a Ö P ô } Ö6 ¬ T � © � �]_WÕ[FW ¬ TM®YW ¬_¬ Z ¬ WÕ[FZ ® T ¬ © � ]�\Øßh� � Wdc ¬ W � ]�­!XsT ¬ W � �Ø[F©!XF®+T�\ �F¬ ]DA � Ö�: T V=]_�W ��� W�[�W[ �Y� ]_V!W�[FW �o�h¬ WY®j� � ©!X � W � � �F� ©4®�ÞFWU[�W ��ó k X � c�\^T�] �8¬ W � �Wh\ ��� [FW'®�ÞsT � ­!WUWj�o[FW'[ � ®�ÞsT � ­!W[FZ �F�Ó� T�\ �F¬ ]DAs®YTÔ�WhZ �2� ©!Xb� � W ��� WY®h��]_V�WY\ØWYXb�B[FW ��ó k X � Wh��P ó µ � c ¬ W ����� TÔ\ �F¬ ]DAs®YTÔ�WhZ � X�¨ªT[F©!XF® � T �¬ W'�WY\ �F� [FW ®h©!\ ��¬ ßh��WY\ØWYXb� � WØ[ � ®�ÞsT � ­�W �� ©�Z �¬ T �F� ©4®�ÞsTÔ]�XFWU®h© ¬�¬ ] � ]_©!X!cáWh� ¬ T� Z�WYZFW�[FZ � ]�­�XsT ¬��F� ©4[�ZF]_�8T�]_X � ]~ZFXM«FT � W ¬ ]�X�W � ©!Z �2¬ W � ]_­!XsT ¬~� ZF]�V�TÔX�� Ös6 ¬ T � © � �]_Wo[FZ �F����ãT�\ ��¬ ]DAF® TÔ��WYZ � c ¬ W � ]_­!XsT ¬ � T ��� W � T �?¬ W ×H:ÍC � ZF]gVÔT ¬ ZF] � ©!Z � � � TÔ] � W ¬ W«sT � W ¬ ]�XFW Ö�: W � ]�­!XsT ¬ cT �F� ß �e� ©!Z � � � TÔ®h�]_©!X�[FW ¬ T ¬ ]_­!XFWo[FW�«sT � Wdc�[FZ � ]�Wh[FW � ��T ¬ csW � �eWYX � ZF]��W�\^©=[FZ ¬_�o� ZF]�V�TÔX��8ZFX�Wà T�Z ��� ]_WYXFX�Wdc![FW � © � ��W � ZFW � ©!X \^T0i4]�\'ZF\ � W?� � ©!Z4V!W?T�Z WYXbV=] � ©!X [FW?Sba�kBX � c�V�©!] � AF­ Ö a Ö PRc Ö: W � ]�­�XsT ¬ \^©=[FZ ¬_� W � � ¬ ZE�©!Z4�W �;¬ W � PRSbaØX � c � Z�] � ] ¬ W � �o[�]�­!]���T ¬ ] ���� T �;¬ ¨ 6B@B7 Wj� � ��©4®�ä �� ©!Z � rh� � W�T�XsT ¬ ` �Ó� ÖÝ ©!Z � ®Y© �Ó� Wh®h�Wh\^WhXb�'®Y©�X�V�W � �] ��¬ W � ]_­!XsT ¬ [FW � © � �]�WØ[FW ¬ ¨ �Y¬ Wh®h� � ©!XF] � ZFW^[�W ¬ Wh®h��Z � W^WYXÑZFX�W� XFW � ­!]_WoWYX à WyOlc ¬ Wo® T ¬ © � ]�\Øßh� � W � ZF«F]_� ��¬ Z � ]�WYZ ��� ® T ¬ ]�« � TÔ�]_©!X �L¬ ] � � � W � ®Y] ã [FW ��� ©!Z � Ö

��ó

Page 47: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

{|~}w� a Ö P ó � C ®�Þ � \ T¹WYX ®h©!Z � W ¬ ©!X�­!]_��ZF[F]�XFT ¬ W [FZ ® T ¬ © � ]�\Øßh� � Wdc ¬ W � [ � ��WY®j�WYZ ��� GÛ7�@ � W� � ©!Z�V!WhXb�e[FT�X �?¬ W Ü ©!XFW�]�Xb�W �Ûã ® � `�© � �TÔ�?Wh�8®Y©�Z�V � WYXb� ¬ T �Ó� ­!]_©!X 1.1 < |ηdet| < 1.5Ö

− 7 © ��� WY®j�]�©�X^[FW ¬ T ¬ WY®j�Z � W8[�W ¬ ¨ �h¬ WY®j� � ©!XF] � ZFW2®YT ¬ © � ]�\Øßh� � W | ¬ ¨ �Y¬ Wh®h� � ©!XF] � ZFW2[FZ ®YT ¬ © � ] ã\^ßj� � WBXFW ¬ ]�� � T � ��©!Z0ÒÓ©!Z ���2¬ W � ]�­!XFT ¬~�h¬ WY®j� � ] � ZFWT�Z+\^T0i4]�\'ZF\ [FW � ©!X�T�\ ��¬ ]_��ZF[FW Ö4G ¬ ÚwT�Z4�[F©!XF®®h© ��� ]�­!W � ®hW � VÔT ¬ WhZ ��� \^T ¬�¬ Z�W � Ö*R ¨ªT�] [ � �W � \^]_X � [FW � ÚwT�®j�WYZ ��� [FW�®h© ��� WY®j�]�©�XET V!Wh® ¬ T\ � �ÞF©=[FW?[FW � � � ©!] �K� ®�ÞsT�Xb�] ¬�¬ ©�X!c ¬ © �Ó� [�¨ªZ�X [FWe\^W � � � T VÔT�Z4iØ[FW8����®�ÞFW8[FW �H� W � V=]�®hWdc=®Y©!\Ø\ØW[ � �T�] ¬_¬�� [sT�X �?¬ Wo®�ÞFT � ]_� � W ��Ö

− : T-®YT ¬ ]_« � T0�]�©�X �Y¬ Wh®h� � ©!XF] � ZFW | ¬ W �E� ]_­!XsT�Z=i1WYX � WY­!] � � �Ó�Y� � ©!Xb� �F� © � © � ��]�©!XFX�W ¬��vk¬ ¨ � XFW � ­!]_W^[ �Y� © ��� W ÖÄ@ W �'� ]�­!XsTÔZ4i �Y¬ Wh®h� � ] � ZFW �Y{ [F]_� @2687 }'T�Z4i�® T � T�®h� �Y� ] � ��] � ZFW � ®Y©�XFX�ZFW �� ©!Xb�o]_X0ÒÓWY®j� �h� [sT�X �;¬ W � ® T�XsTÔZ4i [�W ¬ WY®j�Z � W�[FZ#®YT ¬ © � ]�\Øßh� � Wdc � ZF] �B¬ W � ]�­!XsT ¬ W � �o[F]_­!]_�T ¬ ] ���T V!WY® ¬ W � 6B@B7 { ©!X � T ��¬ W�[FW�®Y©!Z �F� 6B@B7 } Ö�: T ¬ ]�X � T � ]_� � [�W ¬ T ���h� ©�X � W �h¬ Wh®h� � ©!XF] � Z�W�W � �� ��ZF[F] � WUWYX ®Y©!\ � T � T�Xb� ¬ T �Ó�Y� ©!X � W �h¬ WY®j� � ©!XF] � ZFW WhX#Ú ©�XF®h��]�©!X#[FW ¬ ¨ªT�\ �F¬ ]��ZF[�W�[FZ � ]_­!XsT ¬]�X0ÒÓWh®h� � Ö Ý T �¬ T � Z�]_�WKc ¬ W � ]�­!XsT ¬ 6B@o7 W � ��®h© ��� ]�­ � [�W � W~n�Wh� � [FWØXF©!X ã ¬ ]_X � T � ]_� � T V�WY®ØZFXFWÚ ©!XF®j�]�©�X � ZF]�[ �h� WhXF[ [FZ XF©!\'« � WÕ[FW3®h©!Z �F� 6;@o7 ¬ Z � ô Q�P~õ ÖfA X]AsX!c�[FW � ®h© ��� WY®h��]�©!X � WYX­bT�]_X ��� ©�X��8®YT ¬ ®hZ ¬�� W � WYX�®Y©!\ � T � T�Xb� ¬ W � ]�­!XsT ¬ 6B@o7 T V!WY® ¬ W � ]�­!XFT ¬ @2687;Ö

− : T® T ¬ ]�« � TÔ��]�©!XU[�¨ � ®�Þ�W ¬�¬ W | Ý ©!Z � ®Y©!XbV!W � ��] �D¬ W � ]�­�XsT ¬ 6B@B7 WYX^ZFXFWeVÔT ¬ WYZ � [�¨ � X�W � ­�]�WWYX à WyOlc ¬ W � ]�­!XFT ¬ 6B@o7 W � �B\�Z ¬ ��] �F¬ ] �B� T � ZFX�W�®Y©�X � �T�Xb�W { P 687�@ ∼ k Ö S N WyOm} Ö~7 Wh�Ó�W� XFW � ­!]_W � ZF] ®Y© ��� W ��� ©!XF[ k'¬ ¨ � XFW � ­!]_WB[ �h� © �Ó� W[sT�X �8¬ ¨ T � ­!©!X ¬ ] � ZF]_[FWdc4W � � � W ¬ ] � W kU¬ ¨ � XFW � ­!]_W

� Q

Page 48: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

�©��T ¬ W+[FW ¬ T ®hW ¬_¬ Z ¬ W � T � ZFX � ©!]_[ �M� Z�];[ �h� WhXF[*[FW ¬ T ®h©!ZF®�ÞFW¹[�Z�® T ¬ © � ]_\^ßj� � W ÖfA X]AsXic¬ ¨ � XFW � ­!]_W��©���T ¬ W[FW ¬ T � T � ��]�®YZ ¬ W �Y¬ WY®h� � ©!\^T�­!X � �] � ZFW�W � �;©!«��WhX�ZFW�WhX � ©!\Ø\^T�Xb� ¬ ¨ � XFW � ­!]�W[FWo�©!Z���W �?¬ W � ®YW ¬�¬ Z ¬ W � [�W ¬ T'­!W � «�W Ö

− 7 © �Ó� WY®j�]_©!XÑ[FW � W~n�Wh� � ­ � ©�\ � � � ] � ZFW � | ®YWj����WÕ®Y© �Ó� Wh®h�]_©!X ©�«��WhX=Z�W � Z � [�W �'� V!ßYX�W ã\^WhX�� �B� ]_\'Z ¬_�Y� [ �h� WhXF[#[FW ¬ ¨ � X�W � ­�]�W�[�W ¬ ¨ ©!«=ÒÓWh� �Y¬ Wh®h� � ©!\^T�­!X � �] � Z�Wdcá[FW � T � © � ]��]_©!X � T �� T �F� © � �KT�ZU®YWhXb� � W?[FZ [ � �Wh®h�WhZ � cbWj�f[FW � ©!XØT�XF­ ¬ W�[�¨ ]�XF®h]�[FWhXF®YW Öb: T � ]�\�Z ¬ TÔ��]�©!X � W � \ØWh�f[�W[ � ��W � \Ø]�X�W �;¬ ¨ � XFW � ­!]�W � W � [FZ�WU[sT�X �o¬ W�® T ¬ © � ]�\Øßh� � W�®h©!\Ø\^W ¬ T [F]Bn �h� WhXF®YW'WhXb� � W ¬ ¨ � XFW � ­!]�W� ]�\�Z ¬�� WBWh� ¬ ¨ � X�W � ­�]�W � Wh®Y©!X � � � ZF]_��W Ö

− 7 T ¬ ]�« � TÔ��]�©!X¹WhX � X�W � ­�]�WØ[FZ «á© � ©�X �XP | ¬ T+®Y©!X � ��T�Xb��W [FWØ® T ¬ ]�« � TÔ�]_©!X¹[FW ¬ ¨ � ®�ÞFW ¬�¬ W[�¨ � XFW � ­!]�WTÔZ � ]�®o[FWo\^T ��� Wo[FZ P T � � � [ � ��W � \^]_X � W � T � ZFXMT�ÒÓZ � ��WY\ØWYXb�8[FW ¬ ¨ � X�W � ­�]�WB[FW �� T�] � W � [FW �e�h¬ Wh®h� � ©!X �2� Z �e¬ W � ]_®�[�W ¬ T'[F] � � � ]�«FZ���]�©!X3[�W ¬ T'\ T ��� W[FZ�«á© � ©!X P ôªQ!a�õ Ö

{|~}w� a Ö P Q��<OKZFW�[FW � PRaU®�Þ�� ��� ] � [FZM®YT ¬ © � ]�\Øßh� � W Ö

��ô

Page 49: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

{|~}w� a Ö P ô � A ¬ WY®j� � ©�XF] � ZFWB[�ZÕ® T ¬ © � ]_\^ßj� � W Ö�: W ���h¬�� \^WhX�� ���F� ]�XF®h] � T�Z=i � ©!Xb�2ZFX ����� TÔ\ �F¬ ] ãAs® T0�WYZ �X{wÝK� W T�\ � � @ � ]_V�W � }fcáZFXE\Ø©4[�Z ¬ TÔ��WYZ � [FWÚ © � \^W { 5 ] ¬ ��W � � C ÞsT � W � }fcFZFX�W�® T � �W ×�:gC{ ×�:gC+7 T � [7}�Wh�8ZFXFW® T � �W 6;@o7 { 6B@o7 }

� c

Page 50: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

{|~}w� a Ö PRc�� : T Ú © � \ØW¹[FZ � ]�­!XFT ¬ [sT�X ��¬ W � [�]Dn �Y� WhXb�W ��� T � �]_W � [FW ¬ ¨ �Y¬ Wh®h� � ©!XF] � ZFW#[FZ® T ¬ © � ]_\^ßj� � W | WhX*ÞsT�Z��c ¬ W � ]_­!XsT ¬ [ � ��WY®j� � �2TÔZ*\^] ¬ ]�WhZ!c ¬ W � ]�­�XsT ¬ T�\ ��¬ ]DA � �KWYX�«sT � c ¬ W� ]�­�XsT ¬ \Ø©4[�Z ¬�� Ö

� ÷0ÿgý ùØö�ø=� ü�gö*öÍÿ +!õ��wü�÷0ý&�54�ù ÷0ø: ¨ � X�W � ­�]�W8[ � ��WY®h� � Wo[sTÔX �H¬ We®YT ¬ © � ]�\Øßh� � W?XFW ��� ©RV=]�WYXb� � T �û� ZFW;[FW �L� T � ��]�®hZ ¬ W � WhXF­!WYX�[ ��� W �[sT�X �^¬ W � ®Y© ¬�¬ ] � ]_©!X � pp

ÖDG ¬ W � � [F©!XF®M]�\ � © � ��T�Xb�Ø[FW�\^W � Z � W �^¬ T#®Y©!Xb� � ]�«FZ4�]�©�X,[FZ-« � ZF]��� ©!Z � ­bT � T�Xb�] � ZFXFW'«á©!XFX�W � W � Ú © � \ T�X�®YW'[FZ¹®YT ¬ © � ]�\Øßh� � W Ö OK©�]�®Y]g� � ©!] �e�F� ]_XF®Y] � T�Z4iE« � Z�]_� �[FZM®YT ¬ © � ]�\Øßh� � W |

− Ring of fire| k ®YT�Z � WU[FZ \^T�X � ZFW�[~¨ªW ��� T�®hWU[sT�X �;¬ T �Ó� ­!]_©!XE]_Xb�W �Iã ® � `!© � ��T0�qc ¬ ¨ �h¬ Wh® ã� � ©=[FWUT ¬ ]�\ØWYXb�T�Xb� ¬ W � ®h©!ZF®�ÞFW ���h¬ Wh®h� � ©!\^T�­!X � �] � ZFW � [FZ¹®YT ¬ © � ]�\Øßh� � W k ZFXFW'Ú © � \^W�®Y] � ®YZ ã

¬ T�] � W Ö NBZsT�X�[ ®YWh�Ó�W �h¬ WY®j� � ©4[FW ® T � ��WÕZFX « � ZF]_�c � T � Wji4Wh\ �F¬ W �F� ©�V�WYXsTÔX��Ø[�¨ ZFX ®�ÞsTÔX���]�W �Wji=�W � XFWKceZFX1[ �h�*S �M[�¨ � XFW � ­!]_W,As®h��]_Ú'W � � � W � �hZ � ©!Z � �©!Z4�W ��¬ W � ®hW ¬_¬ Z ¬ W � [�¨ ZFXFW \<rh\^W®Y©!ZF®�Þ�W;Wh�H[FZ \MrY\ØWηdet

c=®hÚ Ö As­�Z � WBa Ö P l Ö=A X+a�k!k!S'c ¬ W � ` � ��ßY\ØW;[�¨ ] � © ¬ TÔ��]�©!X �h¬ WY®j� � ] � ZFW8[FZ[ � ��WY®h��WYZ � T � � ��� WY\ �F¬ TÔ® � c�Wh� ¬ T�Ú �Ó�� ZFWYX�®YW�[�W�®hW« � ZF]��8TUXFWh�Ó�WY\ØWYXb�8[F]_\^]_X=Z � Ö

− Coherent noise| ®Y© ��� W ��� ©!XF[ k ZFX,[ � ®YT ¬ TÔ­!W3®Y©�Þ �Y� WYXb�Õ[FW �^� ] � [�W � �T�Z4i [FW+�©�Z��W �

¬ W � ®hW ¬_¬ Z ¬ W � [�¨ ZFXFWo©�Z�[�W ��¬ Z � ]�WYZ ��� ® T � �W � 6B@o7;Öá7 W« � ZF]_��W � �8\^T ¬ ®h©!XFX�Z!cs\^T�] �H¬ W �H� V!ß ãXFWY\ØWYXb� �â� ZF]á` � ©!Xb�2TKn�WY®j� �h�H�F�Ó�Y� WhXb�WBZFX�W;­ � T�XF[FW8©4®h®YZ � TÔ�]_©!X [�¨ ZFXFWe® T � �W 6B@o7 Wj��ZFX�WÚwT�]�« ¬ W ¬ T � ­!WYZ � [FW ¬ TM[F] � � � ]�«�Z��]_©!X [FZ XF©!\'« � W [FW ®Y©!Z ��� [�¨ 6B@o7;ÖK7 W « � ZF]���­ � XFß � W � T �Wji4WY\ �F¬ W�[FW�ÚwT�Z=iØÒÓWj� � c � ZF]�XFW � ©!Xb� � T � ®Y©�X]A � \ �Y� T�Z XF]�V!W TÔZ P'[FZ � ` � �ßY\ØWU[FW�[ � ® ¬ WYX ã®�ÞFWY\ØWYXb�qc�®jÚ Ö S Ö��FÖ

− Spanish fan| ®YW^« � Z�]_��T �F� T � ZÑWYXMÒÓZ�]�X aÔk!k!Q]c �©�ZF®�ÞFW ¬ W � ®hW ¬_¬ Z ¬ W � [FZ ® T ¬ © � ]�\Øßh� � W

� W'� � ©!Z�VÔT�Xb� ¬ W ¬ ©!XF­ [FZ#® � `�© � �TÔ�qc [FT�X �o¬ T �Ó� ­!]_©!X 0.7 < |ηdet| < 0.8c~WhX Ú © � \^T�Xb�B[FWhZ4i

� l

Page 51: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

[FWY\Ø] ã � ©!Z�W � c�®jÚ Ö As­!Z � W3a Ö a�k ÖÄ7 WÕ« � ZF]�� � W3® T � T�®h� �Y� ] � W � T � Z�XFW � Wh�]��WØÚ � T�®j�]�©�X �Y¬ WY®j� � © ã\ TÔ­!X � ��] � ZFW'[�W � ÒÓWh� � Wj�ZFXFW ­ � T�XF[FW'Ú � T�®h��]�©!X¹[FW ¬ WYZ �B� XFW � ­!]�W [ �h� © ��� W [sTÔX �¬ TÕ®Y©�ZF®�ÞFW7�m�Ö

{|~}w� a Ö P l�� A V!ßhXFWY\ØWYXb�8�©!Z�®�Þ ��� T �2¬ Wo« � ZF]_� ring of firecs[FT�X �?¬ W �F¬ T�X (ηdet, φ)

Ö

{|~}w� a Ö a�kÎ� 6 ­bT�Z�®�ÞFWdc � W �F�Ó�Y� WhXb��TÔ��]�©!X [FW � [ �Y�S � � [~¨ � XFW � ­!]�W � ©!Z � Z�X � V!ßhXFWY\ØWYXb�HTKn�WY®h� �� T �8¬ W�« � ZF]�� spanishfan

Ö~6 [ � ©!]��WdcsÚ � T�®h��]�©!XM[�¨ � XFW � ­!]�W�[sT�X �;¬ T^®h©!ZF®�ÞFW 7�m { 7�me5 }8WhXÚ ©!XF®j�]�©�X [FW ¬ TØÚ � T�®j�]�©�X �Y¬ WY®h� � ©!\^T�­!X � �] � ZFW { ADNE5 } � ©�Z � [FW � ÒÓWj� �o� W'� � ©�Z�VÔT�Xb�o[sT�X �o¬ T��� ­!]�©!X 0.7 < |ηdet| < 0.8

Öfn XÑ` V�©!]_� ¬ T �����Y� WYXF®hW+[FZ « � Z�]_� k «FT ��� W ALNM5 Wj�U­ � T�XF[FW7�m;5HÖ

ó k

Page 52: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

{|~}w� a Ö a4P�� A ® ¬ T0� � [FW � ®�ÞsTÔ\'« � W �e��� © � © � ��]�©!X�XFW ¬_¬ W �ûk [ �Y� ]_V!W[FZ�[ � �WY®j�WhZ � [�W�\�ZF©!X � Ö

�5W_��W � WB� WDø��ØögûbùRø�+�ùRø=ÿ�÷��Øö�ø,�#ÿ�ü*�1�: W � ` � �ßY\ØW[FW[ � ��WY®j�]�©�X�[�W�\�ZF©!X � ô S!lKõsô � kKõ�®Y©!Z�V � W ¬ T ��� ­!]�©!X�ÒÓZ �ø� Z�¨ k |ηdet| < 2

cF] ¬� W � \ØWh�Í[�¨ª]_[FWYXb��]DAsW �ͬ W � \'ZF©!X � c�Wh�Ä[�WL[ � �W � \Ø]�XFW �ͬ WYZ � � � T�ÒÓWY®j�©!] � WDWh�Í]�\ � Z ¬�� ]�©!X Ö G ¬ T8� � ©!] �®Y©!ZF®�Þ�W 6 c × Wj� 7 [FZM®hWYXb� � W�V�W �Ó�e¬ ¨ªW�i4� ��� \^]�� � [FZ�[ � ��WY®j�WYZ � cáWh�8[FW � T�]_\ T�Xb� � �© � ©!]�[FT�Z4i�F¬ T�® �Y� WYXb� � W ¬ W � ®Y©!Z�®�ÞFW 6 Wh� × � W � \^Wj����WYXb�;[�W�\ØW � Z � W �e¬ ¨ª]_\ � Z ¬�� ]_©!XÕ[FZM\'ZF©!X k^¬ ¨ TÔ]�[FW[FW ¬ T'®Y©�Z � «FZ � W�[FW ¬ T�� � T�ÒÓWY®j�©!] � W \ cFV!©!] � As­ Ö a Ö Q Ö: W � ` � ��ßY\ØW�[FW�[ � �Wh®h��]�©!X'[�WH\'ZF©�X ��� W�®Y©!\ � © � WL[�¨ªZ�XFW � T � �]_WH®hWYXb� � T ¬ W { â 6BNE9BC | â�]�[FW6 XF­ ¬ W NM9 ©!X C ` � �Wh\|}?®Y©!Z�V � T�Xb� ¬ T ��� ­!]�©!X |ηdet| < 1

c�Wh�;[�¨ ZFXFW � T � �]_W�TRVÔT�Xb�;Wh�oT ��� ]_ß � W{ 546BNE9BC | 5 © � µ�T � [ 6 XF­ ¬ W NE9 ©�X C ` � ��WY\2}Ø®Y©�Z�V � T�Xb� ¬ T �Ó� ­!]_©!X 1 < |ηdet| < 2

ÖL: Wâ 6oNE9;C W � ��®h©!\ � © �Ó� [�W ®�ÞsT�\�« � W ���F� © � © � �]_©!XFXFW ¬�¬ W �mk [ �Y� ]_V!W {�Ý @;< | Ýf� © � © � �]�©�XsT ¬@ � ]�Ú{� < ZF«áW � } ÖL: W � 546oNM9BC ©�X�� � � � ]_X � �T ¬�¬_�Y�U� ©!Z � ¬ W d ZFX G�G�ÖKG ¬�� � ©�X��^®Y©�\ � © ���h� [�W\^]_XF]�®�ÞsTÔ\'« � W �Xk [ �h� ]�V!W { NM@;< | N ]�XF] @ � ]�Ú{� < ZF«�W � }@cÄV!©!] � As­ Ö a Ö a=P ÖÄ: W � â 6BNE9BC Wj�546oNM9BC ©!Xb� � W ��� WY®h��]_V�WY\ØWYXb�oZFXFW�Wh�e� � ©!] � ®Y©�ZF®�ÞFW � [FW � ®Y]�Xb��] ¬�¬ TÔ�WhZ ��� c � ZF] � ©!Xb�;Z4�] ¬ ] �Ó� W �� T ��¬ W � ` � �ßY\ØWD[FWL[ � ® ¬ WYXF®�Þ�WY\ØWYXb� Ö Ý T � T�] ¬�¬ WhZ ��� c � ©!Z ����� [FZF] � W ¬ WK« � ZF]_��[FWKÚ ©!XF[�®Y© � \Ø] � ZFWdc[FW � As« � W �2� ®Y]�Xb��] ¬�¬ T�Xb�W � WYXb�©�Z � T�Xb� ¬ WBâ 6oNE9;C cs\ØW � Z � W ¬ T�[F]Dn �Y� WYXF®hW�[�WB�WY\ �F� WhX�� � W ¬ W\^©!\ØWYXb�g©^z�ZFX'\'ZF©�X�� � T V!W ��� WHZFX Ý @;< Wh��®YW ¬ ZF]�©^z�] ¬ Ú � T �F� W ¬ WK[ � �WY®j�WhZ � cÔ®YW � ZF] � W � \ØWh�[FWoV �Y� ]DAsW �·� Z~¨ªZFXM\'ZF©!X �F� ©RV4]_WYXb�8«F]�WhX+[�¨ªZ�XM® � ©!] � WY\ØWYXb�8[FWoÚwT�] � ®YWYT�Z!c�V�©!] � AF­ Ö a Ö a!a Ö

�h÷3�ä÷1� % � �)Ïä�g��ÐA U�U���R� L �@�.����� J �A U���â�6 Z < WjV�T0� � ©�X!c � �T�Xb�?[F©!XFX �o¬ WB­ � T�XF[3XF©�\'« � W;[FWo®Y© ¬_¬ ] � ]�©�X � Wj�2ÚwT�]�« ¬ W � WY®j�]_©!X+W C ® T�®hW[FW �K� V�ßYXFWh\^WhXb� ��� WY®�ÞFW � ®�Þ �h� c ¬ ¨ ]�Xb� � ­ � TÔ��]�©!X�[�¨ªZ�X � ` � �ßY\ØW8[FW?[ � ® ¬ WYX�®�ÞFWY\ØWYXb� { ©!Z � � ]�­!­!W � }]�Ñ¿z+-=/60A(�4706/3(`8C-g_?bC/3(+z'03b92k4�_�<�e<�2$4PÁj8Òm (�4703/6f+( (�0ÂÁj8C-g*62$/606bC(`_�(c8Òm -=bCew-=470+E

ó P

Page 53: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

{|~}w� a Ö a!aI� A ® ¬ TÔ� � [FW � ®Y©!Z�®�ÞFW � [FW � ®h]�Xb�] ¬�¬ T0�WYZ ��� Wj�e[�W�[ � �Wh®h��WYZ �Ó� T�Xb��] ã ®h© � \Ø] � ZFW � Ö

Wh�[�¨ªT�® � Z�] � ]��]_©!X ���á� ®h]DA � ZFWØT�Z=i¹�© � © ¬ ©!­!]�W � [�Z � ]�­!XFT ¬Ä� Wh®�ÞFW � ®�Þ � W � ��]_XF[F] �Ó� WhX � TÔ« ¬ W Ö�: W� ` � ��ßY\ØW[FW[ � ® ¬ WYX�®�ÞFWY\ØWYXb�BW � �8®Y©�\ � © ��� [�W � XF]_V�W T�Z4i � ZF]�V�TÔX�� � c { V!©!] � As­ Ö a Ö a�S^} |

� ¬ W�XF]_V�W T�ZØk �Ó�Y¬ Wh®h��]�©!XFX�W ¬ W ��� V!ßhXFWY\ØWYXb� � [sTÔX �f¬ W �T� ZFW ¬_� ZFXFW2®h© ¬�¬ ] � ]_©!X pp]_X �Y¬ T � ��] � ZFWTWYZ ¬ ]�WhZ Ö�7 W �L� V!ßYX�WY\ØWYXb� ��� ©!Xb�LT �F� W ¬��h�K� V!ßhXFWY\ØWYXb� � [FW8«F] T�] � \Ø]�XF]_\'ZF\ Ö�: © �Ó�T� ZFW®Ô¨ªW � � ¬ WB®YT � c�ZFX � ]�­�XsT ¬ W � �8\ØW � Z ���o� T ��¬ W � [ � ��WY®j�WYZ ��� [FW ¬ Z�\^]_XF© � ]�� � c=Wj� ¬ WBX�]_V!WYT�Zk W � �8VÔT ¬ ]�[ � ÖF: T'Ú ���~� Z�WYXF®hW�[FW � © � �]_Wo[FZ�XF]_V�W T�ZMkUW � �8[FW P Ö ô NEm Ü Ö� ¬ W�X�]_V!WYT�Z PZ���] ¬ ] � W ¬ W � ]�X4Ú © � \^TÔ�]_©!X � [FZ 7�5�< c�[FW � [ � �Wh®h��WYZ �Ó� [FW � ]�Wh[M[�W�­�W � «áW � c[FZE® T ¬ © � ]_\^ßj� � WoWj�;[�Z ��� WY®j� � ©�\^ßj� � W k \�ZF©!X Ö�6 ®YW � ��T�[�W ¬ T �F� ] � W�[FW�[ � ®h] � ]�©!XM[FW

¬ ¨ �h¬ WY®j� � ©!XF] � ZFW � T � ]_[FW?W � �D[FW�PRSbaBX � Wj� ¬ TBÚ ���� ZFWhXF®YWeWYX � © � �]_W8W � � ��� [FZF]��W k aBä m Ü Ö� ¬ W;XF]�V!W TÔZ+a�Z���] ¬ ] � W ¬ W � ]�X�Ú © � \ T0�]�©�X � Ú ©!Z � XF]�W �H� T �D¬ W � \MrY\ØW � [ � ��WY®j�WYZ ���h� Z�¨ªT�ZÕXF] ãV�W T�ZMP ��¬ Z � ®hW ¬�¬ W � [FZ CFN�< cb©!X � WYZ4�DT�]�X � ]sT V!©!] � [FW � ]_X�Ú © � \^TÔ��]�©!X �g� Z �D¬ T �F���h� WhXF®YW[�¨ ©!«=ÒÓWj� �8� Þb` � ] � ZFW �X{ �Y¬ WY®h� � ©!X � cF� � T�®YW � csWj�® Ö }�[sT�X �?¬ W �2� V�ßYXFWh\^WhXb� � Öá: WXF]_V�W T�ZMaUTZFXÕ��WY\ �F� [FW;[ � ®h] � ]_©!XÕ[FW�PRk!k µ � Wh� ¬ W �H� V!ßhXFWY\ØWYXb� � ©!Xb�2Z�XFW;Ú ���~� ZFWYXF®hW[FW'P ä m Ü Ö� ¬ WfXF]_V�W T�Z�S � Wh®Y©!X � � � ZF]_� � T � ��]�W ¬_¬ Wh\^WhX�� ¬ W � � V�ßYXFWh\^WhX�� � T V�WY®K[FW � T ¬ ­!© � ]_�Þ�\^W ��� ]�\ �F¬ W � Ö: TUÚ ���� ZFWhXF®YW�[FW � © � �]_Wo[FW �8� V�ßYXFWh\^WhXb� � W � � ��� [FZF]�� k ó k m Ü Ö

: W � XF]_V�W T�Z=i P^Wj��a+[�Z � ` � �ßh\^WØ[FW [ � ® ¬ WhXF®�ÞFWY\ØWYXb��©!Xb� � � � \Ø©4[�]DA �h�B� ©�Z �¬ W d ZFX G�G «icTKAsX3[FWBÚwTÔ] � W8ÚwT�®YW k'¬ ¨ªT�ZF­!\ØWYXb��T0�]�©�X [FW ¬ T ¬ ZF\Ø]�X�© � ]�� � ô � PfõJô � a�õ ÖF: W � [ � ® ¬ WYXF®�Þ�WY\ØWYXb� � [FZ® T ¬ © � ]_\^ßj� � Wdc�[FZ 7�5�< Wj�?[FW � [ � �Wh®h�WhZ ��� [FW � ]_WY[+[FWo­!W � «áW � ©!Xb� � � � \^©=[F]BA �Y� TÔZ�X�]_V!WYT�ZPJ� ¬ Wo[ � ® ¬ WYXF®�Þ�WY\ØWYXb�;[�W � � � TRÒÓWY®h��©!­ � T � ÞFW�T � � � TÔ\ �h¬ ]�© ��� TÔZMXF]�V!WYT�ZMa Ö: W � XF]_V�W T�Z=i1P^cDa#Wj�^S ®h© ��� W ��� ©!XF[�WYXb� k ZFX WYX � WY\'« ¬ WM[�W ¬ ] � �W3[FW+�W � \ØW �0{ ZFX �W � \ØW

ó a

Page 54: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

{|~}w� a Ö a�S�� 6 � ®�Þ�]_�Wh®h��Z � W�[FZ � ` � ��ßY\ØW�[FW�[ � ® ¬ WhXF®�ÞFWh\^WhX��;[FW @��ÎÖ�: W � ®Y©�X�� � T�]_Xb�W �8� Z �¬ W � ��TÔZ4i�[�¨ � V!ßhXFWY\ØWYXb� � Wj� ¬ T8[FZ ��� WH[FW �F� ] � WH[FWL[ � ®h] � ]_©!X � ©!Xb�Ä]_XF[F] � Z � W �àk ®�ÞsT � ZFWHXF]_V�W T�Z Ö

®Y© �Ó� W �Ó� ©�XF[ k ZFX3WYX � WY\�« ¬ WB[�WB® � ]_�ß � W ��� Z �H¬ ¨ � V!ßhXFWY\ØWYXb��}fc � ZF] � W � ©!Xb�2WYX � ZF]_��WB®Y©�\'«F]�X �Y� cWh�HT �F� W ¬��h� � � ]_­!­!W � Ö=7 ÞsT � ZFW8� � ]_­!­!W � ®h© ��� W �Ó� ©!X�[Õ[F©!XF® k Z�XFW8��© � © ¬ ©!­�]�W2[�¨ � V�ßYXFWh\^WhX���[F]_Ú ãÚ �Y� WhXb�W Öb7 W � �T�]�X � � � ]_­!­!W ��� ©!Xb�fZ�XFW?T�®Y®hW � �T�XF®hW?� � © � �h¬ WhV � WKc � ©�Z �f���h� ©!ZF[ � W2®YW ��� ©!« ¬ ßY\ØWdc[FW �� WhZF] ¬_� [FW � TÔ��Z � T0�]�©�X { [F]�� �F� W � ® T ¬ W§} � ©!Xb� � © �Ó�Y��� Z � ®hW � � � ]�­!­!W ��� Ö Ý T � W�i�Wh\ ��¬ Wdc~ZFX� � ]_­!­!W � TRV�WY®eZFX �F� W � ® T ¬ We[FW�PRk � ]_­!XF]DAFW � ZFW � WhZ ¬ P � V!ßYX�WY\ØWYXb� � Z � P k � ZF] � TÔ��] � Ú ©!Xb� k� W �® � ]��ß � W �?� W � T � Wj�WhX=Z ÖA �T�Xb�D[F©!XFX �·� ZFW ¬ W � ` � �ßh\^W?[FW?[ � ® ¬ WYXF®�ÞFWh\^WhXb�HX�¨ W � � � T � [ � ® � ]�� � T �f¬ TB®�ÞsT.! XFW?[FW � ]_\'Z 㬠TÔ��]�©!XØ[FW @�� c�®jÚ Ö a Ö a Ö ó c ¬ W � T�XsT ¬ ` � W � [�©!]_V�WYXb�2Z���] ¬ ] � W � [FW � � � ]�­!­�W ��� T `bT�Xb�?ZFXFW;W C ® T�®h]_� ��F� ©=®�ÞFW?[FW�PRk!k � c!©!ZØ«F]_WYXØ[ � ��W � \Ø]�X�W �f¬ WhZ � W C ® TÔ®Y]_� � TKAsXØ[FW � W � ©!XF[ �Y� W �L¬ W �K� V�ßYXFWh\^WhXb� �� ]�\�Z ¬��h� Ö

�h÷3�ä÷�� � �5�i�s�Q����ý�ú��7���¼�s���Q��� L �NÐ��Q�A U�����]�\�i�����JýM UüJ���������Q�s�Q� L ���WKõ ÷0ø�+!ü�1�hùR÷0ÿ;+�ùRýwü�-ö�ø��^ö�ü�;��û�ø��

6 ¬ T � © � �]_WE[FZ�X�]_V!WYT�Z : S]cD©!X ��� ®YZ � ß � W [FW � [F©!XFX � W � « � Z���W � { WYX�T�XF­ ¬ T�] �Ø� Tqµ [FTÔ��T�}� Z�]D[�©!]_V�WYXb� rh� � W^\Ø] � W � [sT�X � ZFX#Ú © � \ TÔ��T �F�F� © �F� ] �U� ©!Z � rj� � W T�XFT ¬ ` ��� W � ÖÍ: W � [F©�XFX � W �« � Z���W �Ø� T �Ó� WYXb� � T � ¬ W �F� ©!­ � T�\^\ØW3[FW � Wh®Y©!X � � � ZF®h��]�©!X [sk � WY®Y© { @�� deAD72n X � � � ZF®j�]_©!X�F� ©!­ � T�\2}fc � ZF] VÔTU� � TÔ[FZF] � W ¬ WYZ �8� ]�­!XFT�Z4i�WYXM©!«=ÒÓWj� �8� Þb` � ] � ZFW {w�Y¬ WY®j� � ©�X � c�ÒÓWh� � c�Wh��® Ö } Ö�: T� WY®h©!X � � � Z�®h�]_©!X'[FW ��� V!ßYX�WY\ØWYXb� �f� WLÚwT�]��ÍÞ�© ���Iã ¬ ]_­!XFWKc�T �F� ß ��¬ W � �©=®�ä0T�­!WH[�W � [F©�XFX � W � « � Z��W �� Z � «sT�X�[FW � cáWj�?X � ®hW �Ó� ]_��W � ZsT0� � W�­ � T�XF[FW �8� ��T � W � |

� ¬ T �F� WY\Ø]�ß � W � ��T � W�®Y©!X � ] � �W k [ � ®Y©=[FW �8¬ ¨ ]�X�Ú © � \^TÔ�]_©!XÕ« � Z��WKc ¬ ¨ T �Ó� ©=®Y]�TÔ�]_©!X3[FW � ® T ãXsT�Z4i �Y¬ WY®j� � ©�XF] � ZFW � T�Z4i�[F]Dn �Y� WYXb� �¹� ©!Z �Iã [ � �WY®j�WhZ ��� Wh� ¬ ¨ªT �F�F¬ ]�® T0�]�©�X k ®�ÞFT � ZFW� ©!Z �Ûã [ � �Wh®h��WYZ � [FW3®h©!X � �T�Xb�W � [�W3® T ¬ ]�« � TÔ�]_©!X Ö Ý ZF] �'¬ W �'� ]�­!XFT�Z4i � ©!Xb� � Wh­ � ©!Z ���h�� ©�Z � Ú © � \^W � [�W � T�\^T �3{ ®YT ¬ © � ]�\Øßh� � W+©!Z�[ � �Wh®h�WhZ ��� [FW � ]�Wh[�[FW ­�W � «áW§} ©!Z�[FW �®Y©!Z �F�={ � � T�ÒÓWY®j�©!­ � T � ÞFW � }@cLTÔZ4i � Z�W ¬��Ø� ©�X�� T �Ó� ©=®Y] � W ¬ T � © � ]_��]�©!X [sT�X �^¬ ¨ªW ��� T�®hWM[�W¬ ¨ �Y¬_� \ØWYXb�2[FW[ � �WY®j�WhZ � ®h© ��� W �Ó� ©!X�[sT�Xb���� ¬ T�[�WYZ4i4]�ßh\^W � ��T � W � Wh®Y©!X � � � ZF]_� ¬ W � � � T�®hW � T V!WY® ¬ W � ®Y©�Z �F�?� Wh®Y©!X � � � ZF]_� �2�F��� ® � [�WY\ ã\^WhXb���

� ¬ TÕ� � ©!] � ]�ßh\^W � ��T � W � Wh®Y©!X � � � ZF]_� ¬ W � V!W � �W�i k+� T � �] � [FW � � � T�®YW � Ö�: ¨ T ¬ ­!© � ]_��ÞF\^W � W ãó S

Page 55: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

®h©!X � � � ZF]��f[�¨ªT�«á© � [ ¬ W � V�W � �Wji �F� ]_\ T�] � W � c � ZF] �Ĭ W � V!W � ��Wji � WY®Y©�XF[sT�] � W � c { V�©!] �Í� Wh®h�]_©!XS Ö a^}*�� ¬ T�[FW � XF]_ß � W � ��T � We]�[FWhX���]DAsW ¬ W �H� T � �]_®YZ ¬ W � Wj��©!«�ÒÓWh� �H� Þb` � ] � ZFW � c k�� T � �] � [�W � ]_X�Ú © �Ûã\^TÔ�]_©!X � [�W � � � ©�] �2� �T � W �?�F��� ® � [FWYXb�W � c�T�]�X � ] � ZFW�[FWo�©!Z �8¬ W �2� ©!Z �Ûã [ � ��WY®j�WYZ ��� Ö

WDõ5+Ôú�õMÓ&�gøEögø=� ý&�#ÿ1�wõ4ù�ýwü�@�� � © �Ó� ßY[�WLZFX�WD®�ÞFTD! XFWf[�W � ]�\'Z ¬ TÔ��]�©!X!cj]�X�[F] �Ó� WhX � T�« ¬ WÄ[sTÔX ��¬ W � TÔXsT ¬ ` � W � cR®YT � W ¬_¬ W � W � \^Wj�[FW �F�Ó� V!©�] ��¬ W � « � ZF]_� � [FWBÚ ©!XF[3Wj� ¬ W ��� ]_­!XsT�Z4iÕTÔ�Ó�WYX�[FZ � Ö�A ¬_¬ W;W � �8®Y©�\ � © ��� WB[FW �F¬ Z � ]_WYZ �Ó�� �T � W � |� ¬ T ­ � X �Y� T0�]�©�XE[FZ �F� ©4®hW �Ó� Z �o� Þb` � ] � ZFW T V!WY®U[�W �o¬ ©�­!]�®h]�W ¬_�2���á� ®h] T ¬ ] ���h� ®h©!\^\ØW Ý O ã<?m8G 6 ©!Z 6;: Ý àAKJ { V!©!] �2� Wh®h�]_©!X ô4Ö S Ö Pq}*�� ¬ ¨ª]_X���W � T�®h��]�©!X,[FW �Õ� T � ��]�®YZ ¬ W � T V!Wh® ¬ W � [F]Dn �Y� WYXb� � [ � ��WY®h��WYZ �Ó�Ík ¬ ¨ªT�]_[FWM[�Z ¬ ©!­!]_®Y]_W ¬[skÔ­ � �T � {w� ©!Z � @£� àAK6;Je<�C ]�\�Z ¬ TÔ��]�©!XØ©�Ú��Þ�W < ©��T ¬ 6 �F� T � TÔ�Z � d W �Ó� ©�X � Wq}HZ��] ã

¬ ] � TÔX�� ¬ W �F� ©�­ � T�\Ø\ØW;[FW � ]_\'Z ¬ TÔ�]_©!X àAK6;Je< ã Svô � SKõd��*Wj� ¬ T � WY®h©!X � � � Z�®h�]_©!X+[FW ¬ TU®�ÞsTD!�XFW[�¨ �Y¬ Wh®h� � ©!XF] � ZFWo[FZ�[ � ��WY®h��WYZ �l{ [Fk � ]_\|}Qô �^� õ ÖJ ©���©!X �;� Z�W ¬ W � ` � �ßh\^WH[FW�[ � ® ¬ WhXF®�ÞFWh\^WhX��DX�¨ W � � � T ���F� ] � WYXU®h©!\ � �W�[FT�X �Ĭ T � ]_\'Z ¬ TÔ�]_©!X ÖÝ T �o¬ T � Z�]_�WKc ¬ W �o� V�ßYXFWh\^WhX�� ��� ]�\'Z ¬��Y�;� T ��� WYXb� � T �o¬ TÕ\<rh\^W'®�ÞFTD! XFWU[�W � WY®h©!X � � � Z�®h�]_©!X� ZFW ¬ W � [�©!XFX � W �8��� W ¬�¬ W � cs[Fk � Wh®Y© Ö

º�ü�÷�� õ�ù^ö�ø��Øö�ü�;��û�ø��[sk � WY®Y© ��� ©=[FZF]_�^[FW � As®�ÞF]�W ��� [�]_� < Þ�ZF\�« J T�] ¬�� WYX�Ú © � \ TÔ�^© � ]�WYXb� � ©!«=ÒÓWj� { 7 �Ô�m}fcDV!©!] �As­ Ö a Ö a ��ÖL6 � T � �] � [FW � As®�ÞF]_W ��� �Þ�ZF\'«FXFT�] ¬_� cD©!X �F� ©4[FZ�]_�Õ[�W � As®�Þ�]�W �Ó� 7H6B5 ã � � WYW �|� ZF]� WhZ�V!WhXb�Yrh� � W¹T�XFT ¬ ` ���h� T V!Wh® ¬ ¨ ©!Z���] ¬ [FWMV4] � ZsT ¬ ] � TÔ�]_©!X Wh� [�¨ TÔXsT ¬ ` � W d2nnB< ô �bó õ Ö Ý ©�Z �¬ ]_\^]��W �?¬ T ��T�] ¬�¬ W�[FW � As®�Þ�]�W �Ó� 7H6B5 ã � � WYW � Wj�oÚwT�®Y] ¬ ]_��W �e¬ W � TÔXsT ¬ ` � W � c ¬ W � [�©!XFX � W ��� ©!Xb� ����ã[FZF]��W � Ö0n X�T ��� W ¬�¬ Wf®hWh�Ó�WK© �á�Y� T0�]�©�X£> � ä�]�\Ø\Ø]�XF­K?Í©!Z � ® � ßh\ T�­�WdcRWh� ¬ ¨ � ®�ÞsT�Xb�] ¬�¬ ©�X ��� [�ZF]_��W � �¬ W�> � ä�]�\�? Ös: W �e� ä=]_\ �8� ©�X�� ��� T ¬ ] ���h�8� T �?¬ TU®Y© ¬_¬ T�«á© � TÔ�]_©!X � Z�]_VÔT�Xb� ¬ W � ]�Xb� �Y� rj� � [FW�®�ÞsT � ZFW­ � ©�Z � W�[�¨ªT�XsT ¬ ` � Wdc � ZF] � \Ø] �<k�¬ WYZ � [F] �Ó� © � ]_��]�©!X ÖÄ: W � As®�ÞF]_W �Ó� 7H6B5 ã � � WYW � ®Y©!Xb��]�WYX�XFWYXb�\^©�]�X � [�¨ ]�X�Ú © � \^TÔ�]_©!X \ T�] � ] ¬��K� ©!Xb� �F¬ Z � ®h©!\ � T�®h� � Wj�HÚwT�®h] ¬ W k Z4�] ¬ ] � W � T V!Wh® 7H6B5 W { � ©�Z �7 ©!\Ø\^©!X 6 XsT ¬ ` � ] � 5 � T�\ØWkµL© � ä A XbV=] � ©!XF\ØWYXb�@}äô � Q"õ Ö�7H6;5 W2W � �DZFX ®YT�[ � W2[~¨ T�XFT ¬ ` � W2®h©!\ ã\'ZFXU© � ]�WhX�� � ©!«=ÒÓWj�qcÔ®Y©!\ � © ��� [FW2[�]_V!W ��� WhX � Wh\'« ¬ W � ]�X�Ú © � \^TÔ�] � Z�W � T �F� W ¬��h� > � TÔ®�äÔTÔ­!W � ?�c�Wj�\^] � W k�¬ To[F] �Ó� © � ]_��]�©!X [FW � ­ � ©!Z � W � [FW ¬ T®Y© ¬_¬ T�«á© � TÔ�]_©!X Ö0G ¬á� W � \^Wj�D[�¨ªZ�XFW � T � �D[FW ¬ ]�\Ø]_��W �¬ ¨ Wji4] � �WhXF®YWØ[FWUÚ © � \^TÔ� � \�Z ¬ ��] �F¬ W � Wj� ¬ T3[FZ �F¬ ]�® T0�]�©�X [�W � W~n�© � � � TÔZ � Wh]�X [FW ¬ T3®Y© ¬_¬ T�«á© ã� TÔ��]�©!Xic�Wh�8[�¨ªT�Z�� � W � T � �8] ¬ ©dn � W ¬ W � ©!Z���] ¬_� X � ®hW �Ó� T�] � W � T�Z4i+[�]_V!W ��� W � T�XsT ¬ ` � W � cá®h©!\Ø\^W ¬ T� © ��� ]_«F] ¬ ]_� � [FWo� � T�X � Ú © � \ØW �H¬ W � AF®�ÞF]�W ��� 7H6B5 ã � � WYW � WhXvAs®�Þ�]�W �Ó� X ã ��Z �F¬ W �h� ZF] ®Y©!Xb��]�WYX�XFWYXb�ÒÓZ � ��W ¬ W � ]�X�Ú © � \ T0�]�©�X � Z��] ¬ W ��kج ¨ªT�XsT ¬ ` � Wdc�©!ZEWYXF®h© � W ¬ ¨ Z��] ¬ ] � TÔ�]_©!XÕ[FW ¬ ©!­�]�®Y]_W ¬_�2� ©!Z � T �=ã�F¬ ] � ZFW � [FW � ®Y© ��� Wh®h��]�©!X � c�©!ZE®YT ¬ ®hZ ¬ W � [�W �;¬ ]�\Ø]_��W � Ös7 ¨ªW � �B[FT�X � 7H6;5 W � ZFW ¬ W � [F]Bn �h� WYXb��W �T�XsT ¬ ` � W � [FW®hWh����Wo�ÞFß � W�©!Xb� � � � W~n�WY®j�Z � W � Ö

GØÐ�� ¢è¸�º�±L¥Y¶+§ ½h¸�º7 W ®�ÞsT � ]�� � W kÑ�F���h� WhX�� �#¬ WE®h©!\ �F¬ W�i�WE[�¨ TÔ®Y® �h¬��h� TÔ��]�©!X�[�W 5 W � \Ø] ¬ T�«!c ¬ T �F� ©=[FZF®j�]_©!X[FW � ÚwT�] � ®hW T�Z4i [FW �F� ©Ô�©!X � Wj�[�¨ªT�Xb�] ��� ©���©!X � T�]_X � ] � ZFW ¬ ¨ T�X�XFW T�Z#[FZ < WhVÔTÔ� � ©!X Ö�: T Ü ©�XFW[FW®Y© ¬_¬ ] � ]�©�XÕT�]_X � ] � ZFW ¬ W � [F]Dn �Y� WYXb� �?� ©!Z �?� ` � ��ßY\ØW � [FZ�[ � ��WY®h��WYZ � @�� Wj�?XF©��T�\^\ØWYXb� ¬ W

óK�

Page 56: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

� � TRÒÓWY®h��©!­ � T � ÞFWLWh� ¬ WH® T ¬ © � ]�\Øßh� � W � Z�] � ©�X��Ä[�¨ªZ�XFW�]�\ � © � �T�XF®YWD® T � ]_�T ¬ W � ©�Z ��¬ T � Wh®�ÞFW � ®�ÞFW[FZÕ«á© � ©!X [FW m ]�­!­ � [FWB®hWh�Ó�We��ÞFß � WB©!Xb� � � � V=Z � ÖFA X]AsXic ¬ W � ` � �ßY\ØWB[FW;[ � ® ¬ WYX�®�ÞFWY\ØWYXb�2Wj�[�¨ TÔ® � ZF] � ]_��]�©!X+T�]_X � ] � Z�W ¬ T � WY®h©!X � � � Z�®h�]_©!X�[FW �?� V�ßYXFWh\^WhXb� � ©�X � � � T�«á© � [ �h� Ö

ó!ó

Page 57: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

{�|~}w� a Ö a � � 7 ÞsTD! X�Wo[FW�[�©!XFX � W�Wj�8[FW � ]�\�Z ¬ TÔ��]�©!X^[FW @��ÅÖ

ó Q

Page 58: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

� � æ��¾ðáî�ò�ê Õ

Ö çØ× ê îMì � �ÚÙ ì3ð���wÈê-ì wËîMð é ð ì � ì

�Z�����]�����]�Ù7��� �1��Ì��@¢ �È"��ÌÕ���£�£���Q�£���£�£���£�Q�£���£�£���£�Q���£�£���£�£�Q���¨§�ÝÙ7�B �1��Ì�Ü]��¢~�@���K�i¢Æ�ËÍ gÆÇ¢�#�"�HÌ@��È"�]¡�i gÆÇ¢~�Û�£�£���£�Q���£�£���£�£�Q���¨§�ÝÙ7�FÙ �1��Ìm�'Ê�Û��"�@ÌmÅd�Ç��ȧ�@¢�'Ëv �Ï'¡*Å"�fÆnÜ7Ú�KÌZ�£���£�£���£�Q���£�£���£�£�Q���¨§)ÝÙ7�¨ì �1��ÌjÛ��"�@Ì Ä* ��*¢�'¡iÆnÜ7Ú�KÌ#���£�£���£�Q�£���£�£���£�Q���£�£���£�£�Q���¨§�¤Ù7�Þ§ �N� Åd¡�K¢~Ï]ÆÇ�#�@¢ g¡Ì�Ü]��¢Ì@�<Ëv g¡¿Ü7Ú* g¡]�@�,���£�£���£�Q���£�£���£�£�Q���àß�ìÙ7�vß íe�]¡È���Ú*ÌfÆÇ�'¡<���£�£���Q�£���£�£���£�Q�£���£�£���£�Q���£�£���£�£�Q���àß�ì

7 W+®�ÞsT � ]_� � W3Wji �F¬ ] � ZFW3®h©!\^\ØWYXb� ¬ W � ©!«=ÒÓWj� � � Þb` � ] � Z�W � Z��] ¬ ] �Ó�Y� [FT�X � ®YWj����WMTÔXsT ¬ ` � W®Y©!\Ø\^W ¬ W � � � T�®hW � c ¬ W � V�W � �Wji*c ¬ W �o�Y¬ WY®h� � ©!X � Wj� ¬ W �o� ÞF©���©!X � c ©�Z WhXF®Y© � W ¬ W � ÒÓWh� � ÞsTÔ[ � © ãXF] � ZFW � Wj� ¬ ¨ � XFW � ­!]_WB� � T�X � V�W �Ó� W�\ T�X � ZFT�Xb�Wdc � ©!Xb� � WY®h©!X � � � Z�]_� � Wj�e]_[FWYXb��]DA �h�·k � T � ��] � [FW �[F©!XFX � W � [FZ#[ � �WY®j�WhZ � Ö�9 XFWU­ � TÔXF[FW � T � �]_W'[FWU®YWU� � T VÔT�] ¬ [FW'�Þ�ß � WØT `bTÔX�� � W � V=] k ]_[FWYX ã�]DAFW �2¬ W �2�Y¬ WY®h� � ©!X � [FT�X �2¬ Wo®YT ¬ © � ]�\Øßh� � WKc4®hWYZ4i ã ®h] � ©!Xb� �F���h� WhX�� �Y�e�F¬ Z � WhXM[ � ��TÔ] ¬ [sTÔX �2¬ W �®�ÞsT � ]�� � W � ó Wj�eQ Ö

� Ð ð ñ �?§Å� ³�£�±H�?§: W � � � T�®YW ��� ©!Xb� � Wh®Y©!X � � � ZF]_��W ��k�¬ ¨ªT�]�[�WØ[�W � ]_X�Ú © � \ TÔ��]�©!X � Ú ©!Z � X�]�W ��� T ��¬ W � � T�ÒÓWY®j�© ã­ � T � ÞFW]�Xb�W � XFW Ö�A X�� � T V�W ��� T�Xb� ¬ W�®�ÞFT�\ � \^T�­!X � �] � ZFWKc ¬ W �8� T � ��]�®YZ ¬ W � ®�ÞsT � ­ � W �;¬ T�] �Ó� WhX��ZFXFW� � TÔ®YW ¬ W ¬ ©�XF­ [FW ¬ WYZ � � � T�ÒÓWh®h��©!] � W � ZsTÔXF[E] ¬�� ]�Xb��W � TÔ­!] �Ó� WYXb�eT V!Wh® ¬ W C�NM< Wh� ¬ W 7�5�<oÖà � X �Y� T ¬ Wh\^WhX��c ¬ W �Õ� V!ßhXFWY\ØWYXb� �+¬ T�] �Ó� WYXb�¹P k 4 k PRk 6 ]_\ � T�®h� � cD[sT�X �3¬ WM� � T�ÒÓWY®j�©!­ � T � Þ�W]�Xb�W � XFW Ö�@ W � T ¬ ­!© � ]��ÞF\ØW � [FW � Wh®Y©!X � � � ZF®h��]�©!X [FWU� � T�®YW � Z4�] ¬ ] � WYXb�o®YW � ]_\ � T�®h� �B� ©�Z �� W ã� � ©�Z�V!W �8¬ W � � � T�®YW � ô ��ô õ�ô � cKõ Ö

� Ð:G ñ �?§ÅÇ'��³g���j© ¦3³Í½YÁ £½j³Í�Ã���Χ �?±H¸�º+´+£½j³Í�: W � V!W � ��Wji �F� ]_\ T�] � W �3{wÝ O | Ýf� ]�\^T � ` OKW � �]�®hW§} � ©!Xb� ¬ W �Ø� ©�]�Xb� � [�¨ ]�Xb�W � T�®j�]�©�X,[FW �®Y© ¬_¬ ] � ]�©!X � pp

Ö?: W � V!W � �W�i � WY®h©!XF[sTÔ] � W �5{ C O | C Wh®Y©!XF[FT � ` OKW � �]_®YWq} � ©!Xb��[ �Y�F¬ T�® �h�M� T �� T �F� © � �8T�Z Ý Olc�] ¬��H�F� ©RV=]�WhXFXFWYXb�e[FW ¬ TU[ �h� ]�Xb� � ­ � TÔ�]_©!X+[FW � T � ��]�®hZ ¬ W �h� Z�] ©!Xb�eZ�XFW[FZ ��� W[FWÕV=]�W ¬ ©�XF­!ZFW3®h©!\^\ØW ¬ W � ZsT � ä « Öf: W � V!W � ��Wji � ©�X�� ®h©!X � � � Z�]_� �Mk ¬ ¨ T�]_[FWÕ[�¨ªT ¬ ­!© � ]��ÞF\ØW

ó!ô

Page 59: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

Z��] ¬ ] � T�Xb� ¬ W � � � T�®YW � [~¨ª]_\ � Z ¬�� ]_©!X�� � T�X � V!W ��� W � Z �á�Y� ]�WhZ � W k k Ö óà WyO�TR`!T�Xb��TÔZØ\Ø©!]_X � [FWYZ=i]�\ � T�®j� � [sTÔX �?¬ W CFNM< ô � l"õ Ö

� Ð�� ñ �?§ ¸�·�á����g§ÅÉ2¥h�?±D� ³�¸�Á £�¿�º3É���½7âض3�?§: W � ©!«=ÒÓWj� �'�h¬ Wh®h� � ©!\^T�­!X � �] � ZFW ��� ©!Xb� ¬ W ���h¬ WY®j� � ©!X � Wj� ¬ W ��� Þ�©��©!X � Ö NoZFT�XF[Ñ] ¬�� � � T ãV!W ��� WhXb� ¬ W;®YT ¬ © � ]�\Øßh� � Wdc�] ¬�� Ú © � \ØWYXb��Z�XFWo­!W � «�W �Y¬ Wh®h� � ©!\^T�­!X � �] � Z�W { ®jÚ Ö a Ö a Ö S Ö S^} Ö4G ¬���� ©!Xb�

� Wh®Y©!X � � � ZF]_� �ûk�� T � ��] � [FW � ��©!Z ��� [FZ ®YT ¬ © � ]�\Øßh� � W k¬ ¨ªT�]�[�W8[�W ¬ ¨ T ¬ ­!© � ]_�Þ�\^W�[�We® S XFW � ]�\ �F¬ W{ C ]_\ ��¬ W 7 ©�XFW 6 ¬ ­�© � ]��ÞF\ØW§}eô ó k�õ�ô ó Pfõ�ô ó a"õ � ZF]�Ú ©!XF®j�]_©!XFXFWo[FW ¬ T \^T�XF]_ß � W � ZF]�VÔT�Xb�W |P Ö ©!X � Wh®�ÞFW � ®�ÞFW ¬ T'�©�Z � ®YT ¬ © � ]�\ � � � ] � Z�WB[F©!Xb� ¬ ¨ ]�\ � Z ¬�� ]�©!XÕ� � T�X � V!W ��� W { T�Z�\Ø©!]�X �?� Z ã�á�Y� ]�WYZ � W k k Ö ó�à WyO�};W � � ¬ T ��¬ Z ��Y¬ WhV � W Ög: T+[F] � WY®h��]�©!X#WhX (ηdet, φ)

[FWØ®YWh�Ó�WU�©�Z �W � � �F� ] � Wo®Y©�\^\ØWo[F] � WY®j�]�©�X3[FW ��� Ú �h� WhXF®YW:�a Ö ¬ W � �©!Z ���?� Wo� � ©!Z�VÔT�Xb�?[sT�X � ZFX � TR`�©!X ∆

d [ � AsXF]�[sTÔX �?¬ ¨ W ��� T�®YW � T � |∆R =

∆η2det + ∆φ2 = 0.4 { S Ö P"}

T�Z4�©!Z � [FW ¬ T [F] � WY®h��]�©!X�[FW ��� Ú �h� WhXF®YW ¬ ZF] � ©�X��BT ��� ©4®h] � W �;� ©!Z � Ú © � \^W � Z�X T�\^T � [FW��©!Z ��� Ö=7 We[�W � X�]�W �f��� WYX�[ ZFXFW?XF©�Z�V!W ¬�¬ W�VÔT ¬ WYZ � [~¨ª]_\ � Z ¬�� ]_©!X'� � T�X � V!W �Ó� WKc=[�W �F� WYZF[�© ã� T � ]�[�]_� � ηdet

Wh�8[�¨ªT�XF­ ¬ W φcsWj�e[�©!XF®ZFXFWXF©!Z4V!W ¬_¬ Wo[F] � Wh®h�]_©!X��

S Ö ¬ W ��� ��T � W � PÕWh�Ua � ©!Xb�']_� �Y�Ó� W ��� Z ��¬ W � T�Z�� � W � �©�Z ��� [FW ®YT ¬ © � ]�\Øßh� � W [�¨ ]�\ � Z ¬�� ]�©!X� � T�X � V!W ��� W � Z ���h� ]_WYZ � W k k Ö ó'à WyOlc�Wj� ¬ W � T�\^T � [�W;�©!Z ��� Ú © � \ �h�H� W � ©�X��?[�W � ®YT�XF[F] ã[sT0� �?�Y¬ WY®h� � ©!\^T�­!X � �] � ZFW �2� ] ¬ WYZ � ]�\ � Z ¬�� ]�©!X^� � TÔX � V�W ��� W���©���T ¬ WBWji4®hßY[FW^P Ö ó à WyO Ön Z�� � W ¬ W � ©�«=ÒÓWh� �Ø�h¬ Wh®h� � ©!\^T�­!X � �] � ZFW � c ¬ W � ÞsT�[ � ©!X � [ �Y� © � WhX�� T�Z �Ó� ]2[FW ¬ ¨ � XFW � ­!]�W3[sTÔX �¬ WÕ®YT ¬ © � ]�\Øßh� � WØWh�UÚ © � \^WhXb�U[FW � ­!W � «áW � ÖÄ6 ]_X � ]&c � ©!Z �'� WIÒÓWh��W �U¬ W � ® TÔXF[F]�[FTÔ� �X� ZF]2X�W � W �Iã� Wh\'« ¬ WhXb� � T � T�Z4i,©!«�ÒÓWh� � �Y¬ Wh®h� � ©!\^T�­!X � �] � Z�W � cK©!X-T �F�F¬ ] � ZFW�[FW � ®Y©!Z � Z � W � [�¨ ]�[FWhXb�]DA ã® TÔ��]�©!X � Z � ®YW � �T�]�XFW � VÔT � ] T�« ¬ W � ô ó S�õ Ö NBZFW ¬Ç� ZFW � ®Y©!Z � Z � W � Ú ���~� Z�WY\Ø\^WhX�� Z��] ¬ ] ��� W �^� ©!Xb�Wji �F¬ ] � Z � W � ®Y] ã [FW �Ó� ©!Z � |Ìo� � ÷�õ�+äã ¬ T Ú � T�®h��]�©!X-[�¨ � XFW � ­!]�WE[ �Y� © ��� W#[sT�X �3¬ T � T � �]�W �Y¬ WY®h� � ©!\^T�­!X � �] � ZFW [FZ�® T 㬠© � ]�\Øßh� � WdcÄV�©!] � As­ Ö S Ö P Ö�A ¬�¬ WEW � �3[ � AsXF]_W ®Y©!\Ø\ØW ¬ W � T �F� © � �ÕWhXb� � W ¬ ¨ � XFW � ­!]�WM[ �Y� © �Ó� W[sT�X �?¬ W � ®Y©�ZF®�ÞFW �e�Y¬ WY®h� � ©!\^T�­!X � �] � ZFW � [FZ+®YT ¬ © � ]�\Øßh� � WBWj� ¬ ¨ � XFW � ­!]�We�©��T ¬ Wo[ �h� © ��� W |

EMfrac =EEM

Etot, { S Ö ad}

­ � X �Y� T ¬ WY\ØWYXb�cF®YW � T �F� © � �?W � � � Z �á�Y� ]�WYZ � W k l�k �ÕÖE�hüØã ¬ ¨ª©�«=ÒÓWh� �h¬ Wh®h� � ©!\^T�­!X � �] � ZFWE[F©!]_�2rh� � W¹] � © ¬�� cHTÔZ�� � WY\ØWYXb�+[F]_� ¬ ¨ªT�®h��]_V=]_� � ®YT ¬ © � ]�\ �jã� � ] � ZFW¹T�Z4�©!Z � [FZ�® T�X�[F]�[sT0�Õ[F©!]��|rj� � W¹]_X�Ú �Y� ]�WhZ � W k k Ö PdcLV!©�] � AF­ Ö S Ö a ÖH: ¨ ] � © ¬ T0�]�©�X,W � �[ � AFXF]�W � T � |

Iso =Etot(0.4) − EEM(0.2)

EEM(0.2), { S Ö S^}

Etot(0.4) {w� W ��� Ö EEM(0.2)}gW � � ¬ ¨ � XFW � ­!]�W�[ �Y� © ��� W2[sT�X �f¬ W�® T ¬ © � ]_\^ßj� � W { � W �Ó� Ö ¬ W � ®h©!ZF®�ÞFW �

�Y¬ WY®h� � ©!\^T�­!X � �] � ZFW � }g[sT�X � ZFXU® S XFW�[FW � T `!©!X ∆d F k Ö�� {w� W �Ó� Ö k Ö a^}gT�Z��©�Z � [FZU®YT�XF[F]_[sTÔ� Ö

ó c

Page 60: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

emfr0.9 0.92 0.94 0.96 0.98 1

emfr0.9 0.92 0.94 0.96 0.98 10

0.2

0.4

0.6

0.8

1 CC

Z->ee, MCZ->ee, Dataqcd fake, Datagamma+jet, MC

emfr

{�|~}w� S Ö PP� @ ] � � � ]_«FZ��]_©!X3[FW ¬ T�VÔT � ] T�« ¬ W ADN Ú � T�®[sT�X �?¬ Wo®YT ¬ © � ]�\Øßh� � We®YWYXb� � T ¬ Ö

L+�� õ4ùR÷0ý� ¹ã ¬ W � ©!«=ÒÓWj� �2�Y¬ WY®j� � ©�\ T�­�X � ��] � ZFW � [F©!]_V�WYXb�8T V!©!] � ZFXFWo«á©!XFX�WBÚ © � \ØW;[FWo­�W � «áW ÖA n�WY®j�]�V!WY\ØWYXb�c ¬ W � ­!W � «áW �U�Y¬ WY®j� � ©�\ T�­�X � ��] � ZFW � ©!Xb�UZFXFWÕÚ © � \ØW [F]Bn �h� WYXb��WÕ[FWÕ®hW ¬�¬ W [FW �­!W � «�W � ÞsT�[ � ©!XF] � ZFW � c { ®hÚ Ö a Ö a Ö S Ö S�}@cFT�]_X � ]�©!X � WhZ�� ���h¬ Wh®h�]_©!XFXFW ��¬ W � ©!«=ÒÓWj� �2�Y¬ WY®j� � ©�\ T�­�X �jã�] � ZFW �hk�¬ ¨ T�]_[FW8[FW � ]_X�Ú © � \ TÔ��]�©!X �D� Z ��¬ T�Ú © � \^We[FW ¬ WhZ � ­�W � «áW Ö Ý ©!Z � ®YW ¬ T]c=©!X �Ó�Y¬ Wh®h��]�©!XFX�W¬ W � ­�W � «áW � [F©�X�� ¬ T m ã N TÔ� � ]�iÕW � �8]_X�Ú �Y� ]�WYZ � W k ZFXFW®hW � �T�]�X�WBV�T ¬ WYZ � cFWhX�­ � X �h� T ¬ WS ó { a�k�}[sT�X ��¬ W 727 { AD7 }L[FZ3®YT ¬ © � ]�\Øßh� � WKc�V�©!] � As­ Ö S Ö S ÖF: T m ã N TÔ� � ]�i^W � �2ZFX3W � ��]�\^TÔ�WhZ � [FW χ2 c® T ¬ ®YZ ¬_��kÕ� T � �] � [FW ¬ ¨ ]�XbV!W ��� WU[�W ¬ TÕ\^TÔ� � ]�®YW�[FWU®Y©RVÔT � ]�T�XF®hWU®Y©!X � � � ZF]_��W TRV�WY® ô { m;N i ô |m ã N TÔ� � ]�i ô }e©!Z c { m;N i�c | m ã N T0� � ] i�c�}eVÔT � ]�T�« ¬ W �£� ZF]f[ � ® � ]�V!WhX�� ¬ T Ú © � \ØWU[FW ¬ TÕ­!W � «áWô ó S"õ Ö

� Ð�� ñ �?§åá~���g§Î²+£�´Õ³Í¸�º3½kâ^¶3�?§: © �Ó� [FW � ®Y© ¬�¬ ] � ]_©!X � ÞsT�[ � ©!XF] � Z�W � c k ®YT�Z � Wo[�W ¬ ¨ ]�Xb��W � TÔ®h�]_©!X Ú © � ��W � Z�¨ ] ¬��L� ZF«�] ��� WYXb�qc ¬ W �

� ZFT � ä � Wh� ¬ W � ­ ¬ ZF©�X �Ä� ¨ ÞsT�[ � ©!XF] � WhX�� { V!©�] �Ä� WY®h��]�©!X3P Ö a^}gWh�ÄÚ © � \^WhXb�ÄZFXØT�\^T �h{ ©!ZeÒÓWh��}Í[sT�X �¬ WB®YT ¬ © � ]�\Øßh� � WdcbV�©!] � AF­!Z � WS Ö��FÖ�: T � WY®h©!X � � � Z�®h�]_©!X!c ¬ ¨ª]_[FWYXb��]DAs®YTÔ�]_©!X Wj� ¬ T�[ � �W � \Ø]�XsTÔ��]�©!X[FW ¬ T \ØW � Z � WU[�W ¬ ¨ � XFW � ­!]_W'[FW � ÒÓWj� � c�X � ®hW �Ó� ]_��WYXb� �F¬ Z � ]�WhZ ���B� ��T � W ��� ZF] � ©!Xb�[ � ® � ]��W � ®Y] ã[FW �Ó� ©!Z � ÖWDõ�÷0ø�+!ü�1�hùR÷0ÿ;+�ùRýwü� | � � ©!] � T ¬ ­!© � ]_�Þ�\^W ��� ©!Xb�;Z��] ¬ ] �Ó�Y�2� ©!Z �8¬ T � Wh®Y©!X � � � ZF®h��]�©!XM[FW � ÒÓWh� �ÞsT�[ � ©!XF] � ZFW � | [~¨ T�«á© � [ ¬ ¨ªT ¬ ­�© � ]��ÞF\ØWo[FWU® S XFW � ]_\ ��¬ Wdc�[ � ® � ]_�oWhX#S Ö S�c~]_[FWYXb�]BAsW ¬ W � TÔ\ T �[FZ^®YT ¬ © � ]�\Øßh� � W:�ÔWYX � ZF]_��W ¬ ¨ªT ¬ ­!© � ]_��ÞF\ØWL[FW8® S XFW d ZFX G�G � T �Ó� Wh\'« ¬ W ¬ W � �©!Z ��� �©!Z�®�Þ � W �H� T �¬ W � T�\ T ���F� ©=®�ÞFW � WhXM® S XFW �8� ��T�« ¬ W � { ©!Z �F� ©��© ã ÒÓWh� � }L[FW � TR`�©!X d F k Ö ó { Rb727�× }H©!Z d Fk Ö ô { Rb727H6 }@c ¬ WU®�ÞF©!] i � ¨ªW � � � © � � �U� Z �o¬ W � Rb727�× [FT�X �¬ W � T�XsT ¬ ` � W � [FW ®hWh����WU�ÞFß � W:� Wj�WYX]AsXMZFXFW �F� ©4® � [FZ � W�[�W � WY®Y©�Z�V � WY\ØWYXb�eWYXb� � W2ÒÓWj� �l{ C ��¬ ]_�Ó�]_XF­ 6 X�[ N W � ­!]_XF­g}�[F]Bn �h� WYX�®Y]�W

ó l

Page 61: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

IsoE0_e0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5

IsoE0_e0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.50

0.2

0.4

0.6

0.8

1 CC

Z->ee, MCZ->ee, Dataqcd fake, Datagamma+jet, MC

IsoE0_e

{�|~}w� S Ö aI� @ ] � � � ]_«FZ��]_©!X3[FW ¬ T�VÔT � ] T�« ¬ W G � ©^[sTÔX �?¬ Wo® T ¬ © � ]�\Øßh� � W;®hWYXb� � T ¬ Ö

©!Z+®Y©!X4Ú ©!XF[E[�WYZ4i ã.k�ã [FWhZ4i ¬ W �8��� ©���© ã ÒÓWj� � c � ©!Z � Ú © � \ØW �2¬ W � ÒÓWh� � AsXsTÔZ4i � ZF]�[F©!]�V!WYXb�;T V!©!] �ZFXFW � X�W � ­�]�WB� � T�X � V!W �Ó� W � Z �á�Y� ]�WYZ � W k Q à WyO ÖWe-�ýwögø���ùRý�8à+!õ�ù�ý ü� | ¬ W � ÒÓWj� ��� Wh®Y©!X � � � ZF]_� �M�F�Ó� ® � [FWh\^\ØWYXb� X�W �F� ©RV4]_WYXFX�WYXb� � T � Ú © � ® ��ã\^WhXb�L[~¨ªZFX � T � ��©!X!cbWj� � ©!Z � \^]_XF]�\Ø] � W �Ĭ W2��T�Z4iØ[�We\^T�Z�VÔT�] � W?]�[FWhXb�]DAF® TÔ��]�©!X!c�©!XÕT ���F¬ ] � Z�W[FW � ®h©!Z � Z � W � [�¨ ]�[FWhXb�]DAF® TÔ��]�©!X,ô óK� õ Ös: W � ®YT�XF[F]_[sTÔ� �h� Z�] � T ��� WYXb�eT ¬ © ��� ®hW � ®Y©!Z � Z � W �e� ©!Xb�� ZsT ¬ ]BA �Y� [�W£> «�©�X � ?DÒÓWh� � Ö�A XMW�i�Wh\ ��¬ Wo©!X � WhZ��8\^WhXb�]�©�XFXFW �2¬ W � ®h©!Z � Z � W �8� ZF]�VÔT�Xb�W � |

• ¬ TÚ � T�®h��]�©!X �Y¬ WY®h� � ©!\^T�­!X � �] � ZFW2[F©!]��ârj� � W;k Ö k ó � ADN Ú � T�® � k Ö l ó4Ö�ADN Ú � T�®;W � �L«�© �IãX � W]�X�Ú �h� ]�WhZ � Wh\^WhXb� � ©!Z �2� WIÒÓWj�W �2¬ W � ®YT�XF[F]_[sTÔ� �h� Z�] ©!Xb� ��¬ Z � [FWo®�ÞFT�XF®YW�[�¨�rh� � W[FZ« � ZF]_�'[FWÕÚ ©!XF[!c�Wh� � Z ���h� ]�WhZ � Wh\^WhXb�ØTKAsX [FW � W ÒÓWh��W �U¬ W � ® TÔXF[F]�[FTÔ� �U�h¬ WY®j� � ©!\ TÔ­!X �jã��] � ZFW �H{ V!©!] �2� WY®j�]_©!XES Ö S�} Ö• � ©!Z �e¬ ]�\Ø]_��W ��¬ W � « � Z�]_� �8�Y¬ WY®j� � ©�XF] � ZFW � ]�\ � © � �T�Xb� � [sT�X �;¬ W � ®h©!ZF®�ÞFW � ÞsT�[ � ©!XF] � Z�W �­ � © ��� ]�ß � W � [FZ¹® T ¬ © � ]_\^ßj� � Wdcs©!X [�WY\^T�XF[FW � Z�W ¬ TØÚ � T�®h��]�©!XM[�¨ � XFW � ­!]_W�[ �h� © �Ó� WU[sTÔX �®hW ¬�¬ W �Iã ®Y] � ©!]_��]�X�Ú �h� ]�WhZ � W k k Ö��FÖ• l!k � [FW ¬ ¨ � XFW � ­!]_W3[FZ¹ÒÓWj�Ø[F©!]_�#rj� � W�®h©!Xb�WhX=Z�WE[sT�X � T�Z \Ø©!]�X � [FWYZ4i ��©!Z �Ó� c � ©!Z �� V4]��W �8¬ W � ��©!Z ��� « � Z�`bTÔX���W � Ö

• ¬ W'ÒÓWj� [F©!]��#rh� � W+®Y©!X]A � \ � TÔZ X�]_V!WYT�Z1PM[FZ � ` � �ßY\ØW�[FW+[ � ® ¬ WYX�®�ÞFWY\ØWYXb�qcK®Ô¨ªW � � ã±k0ã[F] � W � Z�W ¬ W � T �F� © � ��WYXb� � W ¬ ¨ ]�\ � Z ¬_� ]_©!X¹� � TÔX � V�W ��� W3[FZMÒÓWh��Wh� ¬ ¨ � XFW � ­!]�W^[FW � �©!Z �Ó�[FW^[ � ® ¬ WhXF®�ÞFWY\ØWYXb��[sT�X � ZFX ® S XFW ∆d � k Ö ó TÔZ��©!Z � [FZ�®YWhX�� � W^[FZ�ÒÓWh��[F©!]�� rh� � W

� Z ���h� ]_WYZ � W k k Ö ó4Ö!6 ¬ T � © � �]_W2[FZ ® T ¬ © � ]_\^ßj� � W ¬ W �f� ]_­!XsT�Z4i �Y¬ WY®h� � ] � Z�W �f� ©�X��DWhX�V�©R` �Y�k [�WYZ4i �Y¬ WY®h� � ©!X�] � ZFW � | ZFX�W �Y¬ WY®h� � ©!X�] � ZFW [�W^� � ]�­!­�W � : P Wh�'Z�XFW �Y¬ WY®j� � ©�XF] � ZFW^[FW¬ WY®h��Z � W [FW �F�Ó� ®Y] � ]_©!X Ö�7 Wj���WØ[FW � XF]_ß � W ®h©!\ � © � �WUZFX ­ � TÔXF[�­!T�]�X � ZF]fÚwT�]�� � ZFW^[�W �« � ZF]_� ���Y¬ WY®j� � ©�XF] � ZFW �2� WhZ�V!WhX��8[sTÔX � ®YW � ��TÔ]�XFW � ®Y©!XF[�]_�]_©!X � c � ]�\'Z ¬ W � ZFX3[ �Y�S �?®YT ¬ © ã� ]�\ � � � ] � ZFW � Wh\'« ¬ TÔ« ¬ W k ®YW ¬ ZF]g[�¨ ©!«=ÒÓWh� �o� Þb` � ] � ZFW � Ö�: T ®h©!X]A � \ TÔ��]�©!XMT�Z¹XF]�V!WYT�ZÑP�Ó� [FZF]��8[F©!XF®®YWo�T�Z4i+[FWoÚwT�Z=i�ÒÓWh� � ­ � X �h���h�e� T �8¬ ¨ �h¬ Wh®h� � ©!XF] � Z�W Ö

Q!k

Page 62: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

hmx70 5 10 15 20 25 30 35 40 45 50

hmx70 5 10 15 20 25 30 35 40 45 500

0.2

0.4

0.6

0.8

1 CC

Z->ee, MCZ->ee, Dataqcd fake, Datagamma+jet, MC

hmx7

{|~}w� S Ö S�� @ ] � � � ]_«FZ���]�©!XÕ[�W ¬ T'V�T � ] TÔ« ¬ W m ã N T0� � ] iÕ[FT�X �?¬ Wo®YT ¬ © � ]�\Øßh� � WB®hWYXb� � T ¬ Ö

WDõ0+!ü�÷0÷�ø�+�ù�ý ü��ø��Ñû��gø�÷"/áýwø | ¬ T\ØW � Z � W8[FW ¬ ¨ � XFW � ­!]_W2[FW � ÒÓWh� � X � ®YW ��� ]��WeZFX ®YT ¬ © � ]�\Øßh� � W� W � Ú © � \ T�Xb�c!\ TÔ] �Ä� ­bT ¬ Wh\^WhXb�LZ�XFW?«�©!X�XFWe®h©!\ �F��� ÞFWYX � ]�©!XØ[FW � Wfn~Wj� �s� ZF] � W � �Z � «áWYXb� ¬ WYZ �\^W � Z � W ÖF: T'®YT ¬ ]_« � TÔ��]�©!X WhX � XFW � ­!]�We[FW � ÒÓWj� �m{ R!ADC | R Wh� A XFW � ­!]_W C ®YT ¬ Wq}Qô ó!ó õ:ô ó Q�õ � W � \ØWh�[FW � Wh®h�]BAsW �U¬ W � Wfn~Wj� �U� Þb` � ] � Z�W � Wh� ]�X � � � ZF\ØWYXb��T�Z=i Wh� [�©!XF®3[FW � TÔ\^WhXFW �'¬ ¨ � XFW � ­!]�W [FZÒÓWh�U\ØW � Z ��� WÕ[sT�X �U¬ W ®YT ¬ © � ]�\Øßh� � W k � Tv> V � T�]B? VÔT ¬ WYZ � ®Y© �Ó� W �Ó� ©�XF[sT�Xb�ØT�Z XF]�V!WYT�ZMÒÓWh�U[�W� T � ��]�®hZ ¬ W ÖF: T R!ALC W � �e[ � AsXF]_W � T � |

Epartjet =

Edetjet − O

R × S{ S Ö�� }

Epartjet

W � � ¬ ¨ � XFW � ­!]�W[FZ'ÒÓWh�;T�Z�XF]_V�W T�Z � T � �]�®hZ ¬ WoWj� Edetjet

W � � ¬ ¨ � XFW � ­!]_W\^W � Z �Ó� W:� O W � � ¬ T®Y© �Ó� WY®j�]_©!X'[FW � WYZF] ¬!{ ©dn � Wh��}fcÔ®�¨ W � � ã.k0ã [F] � W ¬ ¨ � XFW � ­!]�WD[sT�X ��¬ WH® S XFW�[�Z8ÒÓWh�f\^T�] � XF©�XUT ��� ©4®h] � Wk ¬ ¨ª]_Xb�W � T�®h��]�©!X3[�Z � WKc {w� T � W�i4WY\ �F¬ W ¬ W � « � Z�]_� �?�h¬ WY®j� � ©!XF] � ZFW � c ¬ T � T�[F]�TÔ�]_©!X �Ó�Y� ]_[FZFW ¬�¬ Wo[�W¬ ¨ Z � T�X�]�ZF\ [FZ ® T ¬ © � ]�\Øßh� � Wdc ¬ ¨ WY\ � ] ¬ WY\ØWYXb��TRV�WY® ¬ W � ® � ©!] � WY\ØWYXb� � [FW2ÚwT�] � ®hW T�Z4i �F��� ® � [FWYXb� � c©!Z ¬ W � ]�Xb�W � T�®j�]_©!X � \'Z ¬ �] ��¬ W � pp

T�Z�� � W �e� ZFW ¬ W � ®Y© ¬_¬ ] � ]�©!X � [FZ � W � }@c�®hWh�Ó�W�®Y© �Ó� WY®j�]_©!XM[ �jã� WhXF['[FZ � T `!©!XU[FZ�® S XFWLWh��[FZ ηdet

[FZ8ÒÓWh�!�RW � � ¬ T ���h� ©�X � WL®Y© �Ó� ]�­ � WH[�Z'® T ¬ © � ]�\Øßh� � WdcRW ¬�¬ W�]�WhXb�2®Y©!\ � ��W � T � Wji4Wh\ �F¬ WB[FW ¬ T � W � �Wo[~¨ � XFW � ­!]�Wo[sTÔX � ®YW � ��T�]_XFW ��� ­!]�©�XÕ[FZ�® T ¬ © � ]_\^ßj� � WKcW ¬�¬ W [ �Y� WYXF[ [�Z ηdet

Wh�'[�W ¬ ¨ � X�W � ­�]�W [FZ�ÒÓWj��� SW � � ¬ T�®h© ��� WY®j�]�©�X [FW^­!W � «�WKcÍ®hW^ÚwT�®j�WYZ ��]�WhXb�2®Y©!\ � ��Wo[FW ¬ T�Ú � TÔ®h�]_©!XÕ[�¨ � X�W � ­�]�W[ �Y� © �Ó� WÞF© �Ó� [FZ+® S XFW[FZ�ÒÓWj� � T � [FW �8� T � ��]�®YZ ¬ W �[FZeÒÓWh�f[�W � T � �]�®hZ ¬ W � cÔWh� � ­bT ¬ Wh\^WhXb�Ä[FW ¬ ¨ � XFW � ­!]�WL[ �Y� © ��� W2[sT�X ��¬ W�® S XFW � T � [FW �f� T � ��]�®YZ ¬ W �

� Z�] X�¨ T �F� T � �]�WhXFXFWhX�� � T � TÔZ'ÒÓWj�8[FW � T � ��]�®hZ ¬ W � Ö: W � ÒÓWj� �L� ]�\�Z ¬��h�D� ZF«F] ��� WhXb��[FW � ®Y© ��� Wh®h��]�©!X �D� Z �F�F¬�� \^WhXb��T�] � W � ®h©!\^\ØW?[ � ® � ]��H[sTÔX �L¬ T � WY® ã�]�©�X ô4Ö S Ö a ÖWDõ +!ü�÷�÷0ø�+�ù�ý ü�¤ö�ø�� øbù"� �Yø��Ñý{���#ÿgü�gý�þ~ÿgø�� | ¬ W � ÒÓWh� �X� ZF] �F�Ó�Y� WYXb�WhX��ØZFX�W { ©!Z �F¬ Z ã� ]�WhZ ��� }H[ �Y� ]�Xb� � ­ � T0�]�©�X � WY\Ø] ã \'ZF©!XF] � ZFWBX � ®YW �Ó� ]��WYXb�eZFXFW®Y© ��� Wh®h��]�©!X � Z �F�F¬�� \^WhXb��T�] � WT �4ã� W ¬�� WØ®Y© ��� Wh®h��]�©!X � WY\Ø] ã \'ZF©!X�] � ZFWÍô ó!ô õ ÖÍA XÑWfn~Wj�qc ¬ T+[ �h� ]�Xb� � ­ � TÔ�]_©!X � WY\Ø] ã \'ZF©!XF] � ZFW [FZ

Q�P

Page 63: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

ÒÓWh� � WhZ � T � W�i�Wh\ ��¬ W ® ��� W � ZFX XFWhZ�� � ]�XF©EWh�UZFX \�ZF©!X � T � \Ø] � [�¨ TÔZ�� � W �U� T � �]_®YZ ¬ W � ÖÍ: WXFWYZ4� � ]_XF©+X�¨ ]�Xb�W � T�­!]�� � T � T V�WY® ¬ WU[ � �WY®j�WhZ � Wj� ¬ WU\'ZF©�X ]_Xb�W � T�­!]��B� � ß �� WhZ T V�WY® ¬ WU® T 㬠© � ]�\Øßh� � WdcK®hW � Z�]B® �Ó� W#[FW ¬ ¨ � X�W � ­�]�WE� � T�X � V!W ��� W#\^T�X � ZsT�Xb��Wdc { ®hÚ Ö S Ö ó } Ö�: T ®Y© �Ó� WY®j�]_©!X� Wh\^] ã \'ZF©�XF] � ZFW � W � \^Wj�?[F©!XF®�[FW®Y© ��� ]_­!W � ®hW � W~n�Wh� � Ö�7 Wh�Ó�W®Y© �Ó� Wh®h�]_©!X�W � � � T � �]_®YZ ¬ ]�ß � W ã\^WhXb�']�\ � © � �T�Xb�W � ©!Z ��¬ W � ÒÓWh� � [FW � ZsT � ä «ic � ZF]�[FT�X �'�F¬ Z � [�W¹PRk � [FW � ®YT � ©!Xb��ZFXFW[ �Y� ]�Xb� � ­ � T0�]�©�X � WY\Ø] ã \'ZF©!X�] � ZFWB[FZ+� ` � W b → µνX

Ö

Qba

Page 64: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

{|~}w� S Ö�� � C ®�Þ � \^T2[�¨ ZFX?ÒÓWj��ÞsT�[ � ©!XF] � ZFWKWhX�� � ©!] ��� �T � W � | ¬ W � � T � ��©!X � ] �Ó� Z � [FW ¬ T2®h© ¬�¬ ] � ]_©!X[FZ � W � \^Wj����TÔX��[�W � ­ ¬ Z�©!X �B� V!© ¬ ZFWYXb��WYX � T � �©!X ÒÓWh� �M{w� T � �©�XÕÒÓWj�@}*� ¬ W8ÒÓWh�[�W � T � ��]�®YZ ¬ W �{w� T � �]_® ¬ W'ÒÓWh��}Ø®h© ��� W ��� ©!XF[ k�¬ ¨ ÞsT�[ � ©!XF] � TÔ�]_©!X [FW �Õ� T � ��©!X � Wj� k ¬ T�[ �h� ]�Xb� � ­ � TÔ�]_©!X-[FW �ÞsT�[ � ©!X � ® ��� W � WYX � T � ��]�®hZ ¬ W ���F¬ Z ��� ��T�« ¬ W �ä{w� ]_©!X � c0ä0T�©!X � cÔWj�® Ö }*� ¬ W�ÒÓWh�f[FT�X ��¬ WH®YT ¬ © � ]�\Øßh� � W{ ® T ¬ © � ]�\ØWh�W � ÒÓWj�@}~W � � ¬ T � ÞsT � WK©^z®YW �g� T � ��]�®YZ ¬ W � ]_Xb�W � T�­!] ��� WhXb�gTRV�WY® ¬ W � [F]Dn �Y� WYXb�W �g� T � ��]�W �{ ADN c 5Äm Wj� 7�m }�[FZM®YT ¬ © � ]�\Øßh� � W � ©!Z � Ú © � \ØW � [FW � ­�W � «áW � Ö

Q!S

Page 65: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

� Ð:æ ñ ª É?º3��³Í¿�½j�Æ� ³�£�º+§�Ç'��³�§ �ÃÁ £�º�âض+£�ºU���: ¨ � X�W � ­�]�We� � T�X � V!W ��� W�\^T�X � ZsTÔX���W�ô ó c�õ~W � � ¬ ¨ � XFW � ­!]_W � ZF] � ®�ÞsT �F� W k�¬ T�[ � ��WY®j�]�©�X!c4W ¬�¬ W

� WhZ��ârh� � W ¬ T � ]�­!XsT0�Z � We[�¨ ZFXÕX�WYZ�� � ]�X�©�c�® T � ®YWe[FW � XF]�W � X�¨ ]�Xb�W � T�­�]_� � T � T V!WY® ¬ W8[ � ��WY®h��WYZ � ÖC T�[ � �W � \Ø]�XsTÔ��]�©!X � W � © � W � Z �2¬ W �F� ]�XF®h] � W;[FW ¬ T�®h©!X � W � VÔTÔ��]�©!X3[FW ¬ ¨ª]_\ � Z ¬�� ]�©!XU� � T�X � V!W �Ó� W¬ © �Ó� [FW � ]_Xb�W � T�®h��]�©!X � Ö�7 W �F� ]�XF®h] � W�]_\ ��¬ ] � ZFW � ZFW ¬ T � ©!\Ø\^WV!Wh®h��© � ]_W ¬�¬ W�[�W � ]_\ � Z ¬�� ]�©!X �� � T�X � V�W �Ó� W � pT

[FWØ�©!Z���W ��¬ W ��� T � �]_®YZ ¬ W ��F� ©=[FZF]��W � [sTÔX ��¬ ¨ª]_X���W � T�®h��]�©!X#[F©!]�� rh� � W X�Z ¬_¬ W ÖC ] ¬ T � ©!\Ø\ØWÕ[FW � pT\ØW � Z ��� W � X�¨ W � � � T � X�Z ¬�¬ Wdc�®Ô¨ªW � � � Z�¨ ZFXFW+©!Z �F¬ Z � ]_WYZ �Ó�U� T � ��]�®hZ ¬ W �©!Xb�WY\ � © � � � W � [FW ¬ ¨ � XFW � ­!]_W � TÔX � rj� � WØ[ � �Wh®h� � W � Ö�: WhZ �� XFW � ­!]_W � � T�X � V!W ��� W W � ��T �F� W ¬�� W

� XFW � ­!]_W;� � T�X � V!W �Ó� W�\ TÔX � ZsT�Xb�WKcsWh�?W ¬_¬ WeW � �8XF©Ô� � W 6ET

Ös: ¨ � XFW � ­!]_WB� � TÔX � V�W ��� W�\^T�X � ZsTÔX���WW � � [F©!XF®3[ � AsXF]_W � T �'¬ ¨ª© ��� © �Ó� [FW ¬ T � ©!\Ø\ØWÕ[FW �U� XFW � ­!]�W � � � T�X � V�W �Ó� W � [ �h� © �Ó� W � [sTÔX �¬ W � ®YW ¬_¬ Z ¬ W � [�Z�®YT ¬ © � ]�\Øßh� � W { ¬ W � ®h©!ZF®�ÞFW � ÞFT�[ � ©�XF] � ZFW � ­ � © �Ó� ]�ß � W � [�Z�®YT ¬ © � ]�\Øßh� � Wdc�� � © �« � Z4`bT�Xb�W � c�XFW � ©�X�� � T � ®h©!\ � ��T�«�] ¬ ] ��� W � } |

~6ET = −cellules∑

~pT . { S Ö ó }: ¨ � XFW � ­!]�W � � T�X � V!W ��� WM\^T�X � ZsT�Xb��WÕW � �^Z�XFWÕVÔT � ]�T�« ¬ W � WhX � ]_« ¬ W3®YT � W ¬�¬ W [ �Y� WYXF[ [FW � ®Y© �Iã� Wh®h�]_©!X � T �F� © � � � W �H� T �H¬ T�®YT ¬ ]_« � TÔ��]�©!X [FW � ©!«=ÒÓWj� ���h¬ Wh®h� � ©!\^T�­!X � �] � ZFW � Wj��[FW � ÒÓWh� � [�¨ ZFXFW� T � �qc�Wj�2[FW � \'ZF©!X �h� ZF]�]�Xb�W � T�­�] ��� WYXb�2ÚwT�]_« ¬ Wh\^WhX��HT V!Wh® ¬ W;®YT ¬ © � ]�\Øßh� � W8[�¨ TÔZ�� � W � T � � Ösn X[F©!]��2[F©!XF® ¬ ZF] T �F��¬ ] � ZFW �2¬ W � ®Y© �Ó� WY®j�]_©!X � [FW |

� ¬ T�®YT ¬ ]_« � TÔ��]�©!X¹WhX � X�W � ­�]�WØ[FW � ©!«=ÒÓWh� ���h¬ WY®j� � ©!\ TÔ­!X � ��] � ZFW �2{ � W ��� Ö ÒÓWh� � }fc � ZF]f�]_WYXb�®h©!\ � �W8[FZ ®�ÞsTÔXF­!WY\ØWYXb�H[FW ¬ ¨ � XFW � ­!]�W8[FW � ©!«�ÒÓWh� �L�Y¬ WY®h� � ©!\^T�­!X � �] � ZFW �Q{w� W ��� Ö ÒÓWj� � }*�

� ¬ ¨ª]_\ � Z ¬�� ]_©!X�� � T�X � V!W ��� WM[FW � \'ZF©!X � ÖfA ��T�Xb� «F]_WYX \ØW � Z ��� W � T �'¬ WÕ� � T�ÒÓWh®h�©�­ � T � ÞFWWj� ¬ W ��� WY®j� � ©�\^ßj� � W k \'ZF©�X!c ¬ ¨ ]�\ � Z ¬_� ]_©!XØ� � T�X � V!W ��� W�[FW � \�ZF©!X � W � � � ©!Z � � � T�]_��W[FW¬ ¨ � XFW � ­!]�WB� � T�X � V!W ��� W�\ TÔX � ZsT�Xb�W

� Ð�ç ¢è¸�º�±L¥Y¶+§ ½h¸�º7 W ®�ÞsT � ]_� � W T � � � ®Y©�X � T�® ���Yk�¬ T �F���h� WhX��TÔ�]_©!XÑ[FW � ©!«�ÒÓWh� ��� Þb` � ] � ZFW � Z��] ¬ ] ���Y� [sTÔX �®YW�\ T�X�Z � ® � ]_� Öá@ ¨ªT�«á© � [ ¬ W � � � T�®YW � T�]_X � ] � ZFW ¬ W � V!W � �W�i �F� ]�\^T�] � WoWh� � WY®h©!XF[sT�] � W�©!Xb� � � �]�Xb� � ©4[�ZF]_� � Ö�A X � ZF]��W ¬ W � ©!«=ÒÓWj� ��Y¬ WY®h� � ©!\^T�­!X � �] � ZFW � c~WYX � T � �]_®YZ ¬ ]�W �8¬ W �o�Y¬ WY®h� � ©!X � Wh� ¬ W �ÒÓWh� � cÍ� � ß � ]�\ � © � ��TÔX���[sTÔX �'¬ ¨ªT�XsT ¬ ` � W^[FWÕ®YWj����W �ÞFß � W3©!Xb� � � � [ � ��TÔ] ¬�¬_�Y� ÖÍA X]AFX ¬ ¨ � XFW � ­!]_W� � T�X � V�W �Ó� W�\ T�X � ZFT�Xb�W�T � � � [ � AsXF]_W Ö

Q �

Page 66: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

� � æ��¾ðáî�ò�ê è

� u¤òMò�êb`�îMð!u a ëÈê éhé � aÈê-ò�ê�ð�ê í ê-ìYwÈò � ê ë æ a ìé�ê ` æ¤é!u òMð í ñ î�ò�ê

�Z�����]�����]�ì��� ��Å"�fÄ*���*�<�*�KÌ��@¢�'ÆÇÌ�Å�ÈqÄ g¡]�fÆ����Ç�'¡*Ì ���£�£���£�Q���£�£���£�£�Q���àßt§ì�B ëûÈÄ* g¡]�fÆ����D�]¡Ì��i�M�i�'¡i¡*Å���Ì��£���£�Q�£���£�£���£�Q���£�£���£�£�Q���àß�Ýì�FÙ ��ÅK�Ç��È"�fÆD�]¡Z�i��Ì Å"Ü'�d¡�dËÍ�d¡]�@Ì,���£�Q�£���£�£���£�Q���£�£���£�£�Q���àß�Ý

æg¦ºÞ^¦¨¥ ìäÓ�².ª�¯±À�»¨¶�®²±»Fµq¶<¿^­#´�»FÓ�¿�ª�«±²¼®³ ¦·¦h¦·¦h¦·¦·¦h¦e¦h¦·¦·¦h¦·¦h¦·¦h¦ �"áæg¦ºÞ^¦º¹ ídÓ�³Fª�½�²±»Fµq¶M¿^­M«±»¨Ø§¶�®³ ¦·¦h¦·¦e¦h¦·¦h¦·¦h¦·¦·¦h¦e¦h¦·¦·¦h¦·¦h¦·¦h¦ �"á

ì�¨ì ��Å��@��¢qËvÆ�¡ ^�fÆÇ�]¡ �i��ÌmÉ& �ȧ�@�KÚ*¢~Ì �*�<È"��¢¢~�Kȧ�fÆÇ�'¡ ���£�£���£�£�Q��� Ý]�ì�Þ§ íe�]¡È���Ú*ÌfÆÇ�'¡<���£�£���Q�£���£�£���£�Q�£���£�£���£�Q���£�£���£�£�Q��� Ý]�

�+Ð ð ò É��g²3¸^´3�Æ´+�?§ � ³�¸�½h§ÎÉ?±f²+£�ºU��½h¥j¥j¸�º+§Ý ©!Z � [�]_V!W ��� W �2� TÔ] � ©�X �m{w¬ T�®YT ¬ ]_« � TÔ��]�©!X �Y¬ WY®j� � ©�XF] � ZFWKc ¬ T ¬ ©!X�­!ZFWYZ � [FW � ®q��« ¬ W � c ¬ W � Wh\ ã

�F¬ T�®hWY\ØWYXb�2[FW\^TÔ� �h� ]�T�Z4i*c�Wj�® Ö }fc�] ¬~� WYZ4�8`ÕT V!©!] � ZFX�[ � ®YT ¬ T�­�WB[FW ¬ T ¬ WY®j�Z � W�[�W ¬ ¨ �Y¬ Wh®h� � © ãXF] � ZFWe[FZÕ® T ¬ © � ]�\Øßh� � W { ®hÚ Ö a Ö a Ö S Ö Sd} Ö�7 WY®h]�T � ©!Z � ®Y©!X ���� ZFWhXF®YW � ZFW ¬ W � ]�­!XFT ¬ X�¨ªW � � � T �H¬ ZT�Z \^T0i4]�\'Z�\�[FW � ©!X3T�\ �F¬ ]_�Z�[FWdcb®h©!\^\ØW?] ¬_¬ Z � � ���?� Z �H¬ TmAs­�Z � W �FÖ P Ö46 AsXÕ[FWe®Y© �Ó� ]_­!W � ®YW �V�T ¬ WYZ ��� \^T ¬�¬ Z�W � c=Wh��[F©!XF®B[�W;[ � �W � \^]_XFW �L¬ TV�T ¬ WYZ � [FZ � ]�­!XFT ¬ TÔZÕ\ T�i�]_\'ZF\ [FW � ©!X+TÔ\ ã�F¬ ]��ZF[FWKc�©!X3Z��] ¬ ] � W ¬ T�\ � ��ÞF©=[FW;[F]��We[FW � � � ©!] �L� ®�ÞsT�Xb�] ¬�¬ ©�X ��{ ©!Z < � ] ��¬ W C T�\ ��¬ W N Wh��ÞF©4[�}ô ó l"õ Öá7 Wj����W���WY®�ÞFXF] � ZFW � W�®Y©!\ � © � Wo[FW � � � ©!] ��� �T � W �e� ZF]_VÔT�Xb��W � |P Ö [�¨ªT�«�© � [!c ¬ ¨ T�\ �F¬ ]_�Z�[FW;[FZ � ]_­!XsT ¬ \ØW � Z ��� W � T �8¬ W � ® TÔXsT�Z4i�[FZM® T ¬ © � ]_\^ßj� � Wdc�W � � ¬ ZFW� � ©!] � Ú ©!] � cáT�ZM��WY\ �F� � { J | J © � \^T ¬ }fc�� ã [�� { A | A T ��¬ `�}@c�Wh�;�x�B[�� { : | : TÔ��W§}@c~T V!Wh®[�� F PRS!a�X � c�®hÚ Ö]�FÖ PJ�a Ö WYX � ZF]_��Wdc � ©!Z � ®�ÞsT � ZFWe® T�XFT ¬ c!©�XÕT�ÒÓZ � �W8ZFXFW2Ú ©!XF®j�]_©!X � ]�\'Z ¬�� Wmô Q!k"õ { TÔ����WYXF[�ZFW � ©!Z �¬ T;Ú © � \^WH[FZ � ]�­�XsT ¬ }@c!T `bTÔX��D®h©!\^\ØW � T � T�\Øßh� � W ¬ ]_« � W ¬ TBXF© � \ T ¬ ] � TÔ�]_©!X�Wh� ¬ WH��WY\ �F� cT�Z4i3� � ©!] � VÔT ¬ WhZ ���?�F�Ó� ® � [FWh\^\ØWYXb�8\^W � Z �Ó� W � [FZ � ]_­!XsT ¬ �

S Ö WYX]AFX!c ¬ W2ÚwT�®h��WYZ � [FW8®Y© ��� Wh®h��]�©!X k T �F�F¬ ] � ZFW � T�Z � ]_­!XsT ¬s� ©!Z � ®h© ��� ]�­!W �f� T�VÔT ¬ WYZ � \^T ¬¬ ZFWKcFW � �8® T ¬ ®YZ ¬_�o� ©!Z � ®�ÞsT � ZFW�® T�XsT ¬ Ö

Q ó

Page 67: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

î -kïiði2$4�4�(`8C(+z�06<�/3($E

î aDïAñÔ-=<�lx-$bC*6(`89(:z'06<./6(kE{|~}w�J�FÖ Pò� 5 ]_­ Ö1�FÖ P { T�}@c � W �F���h� WYXb�TÔ�]_©!X [�¨ªZ�X � ]�­!XsT ¬ «F]_WYX ¬ Z | [�W�­!T�ZF®�ÞFW k [ � ©!]_��Wdc ¬ W� ]_­!XsT ¬L¬ Z T�Z �Wh\ ��� � ã [4� { W T ��¬ `]}@c�� { XF© � \^T ¬ }Wh�U�=�B[�� { ¬ TÔ��W§}@cÄT V!Wh®�[4� F PRSba X � � 6 Z�Wh\ �F� �c ¬ W � ]_­!XsT ¬ W � ��®Y© �Ó� Wh®h�Wh\^WhXb� ¬ Z�TÔZ�\^T0i4]�\'Z�\ [FW � ©�XÑT�\ �F¬ ]��ZF[�W Ö�5 ]�­ Ö*�FÖ P { «7}@c� W �F���h� WYXb�TÔ�]_©!X#[�¨ªZ�X � ]�­!XsT ¬ \ T ¬�¬ Z | TÔZ#��WY\ �F� �qc ¬ W � ]_­!XsT ¬ X�¨ W � � � T ��¬ Z#T�Z \ T0i4]_\'ZF\[FW � ©!XMT�\ �F¬ ]��ZF[�Wdc=®YWh�Ó�W�\^W � Z � W[F©!]_��[F©!XF®mrh� � W®Y© ��� ]_­ � W Ö

Q!Q

Page 68: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

�+Ð:G ó1±f²+£�ºU��½h¥j¥j¸�º+§ ´3�¼´3¸�º+º+É2�?§: W � [�©!XFX � W ��� �Z�[F] � W � ôªQ�SKõ©!Xb� � � � ®h© ¬�¬ WY®j� � W �+¬ © �Ó� [FW � ZFX �M�Ó��� ®Y] TÔZ4i�WYX � WY­�] � � ���h�WYX Ú � V � ]_W � Wj� [ � ®hWY\'« � WMa�k!k!Q]cÍWYX Ú � V � ]�W � a�k!k ô Wj� WYX \ T�]Ha�k!k�c]cÄT V!Wh®MZ�XFW ¬ ZF\Ø]�X�© � ]�� �]�X � ��T�Xb��TÔX � WEÚwTÔ]�« ¬ WM®h©!\ ��� ] � WEWhX�� � W a ô=Ö PRk 30 ®Y\ −2 � −1 Wj�¹PRk!k Ö PRk 30 ®Y\ −2 � −1 Ö�: ¨ªWhX � Wh\'« ¬ W[FW � � � ]_­!­!W �Ó� � � ] ��¬ We��]�\Ø]�XF­�T � � � Z���] ¬ ] ��� c=] ¬�� W � ZF]_W � �?T�Z3\Ø©!]�X � ZFX � ]_­!XsT ¬ [sT�X � X�¨ ]�\ � © � �W

� Z~¨ªW ¬�¬ W �©�Z � [FZ ®YT ¬ © � ]�\Øßh� � W Ö�9 X � WYZ �F¬ Z � [�WÕQ!k!kEk!k!k � V!ßhXFWY\ØWYXb� � ©�X�� � � �^� Wh®YZFWh] ¬�¬ ] �� ©!Z � ®YWh�Ó�W�T�XsT ¬ ` � W Ö7 ©!Xb� � TÔ] � Wh\^WhXb��T�Z4i#TÔZ�� � W � T�XsT ¬ ` � W � [�WØ®hWh�Ó�WU�ÞFß � WKc ¬ W � [F©�XFX � W � ©!Xb�[F] � WY®h��WY\ØWYXb� � � ���� ®hZ �á�Y��� W �^� T � XF© � � ©!]�X � cf[sT�X �ج T «FT � W�[FW+[F©!XFX � W�[FW @�� T �F� W ¬_� W C46BN ô Q � õ&c � ©!Z �Ú © � \ØWB[FW�As®�ÞF]_W �Ó� ��Þ=Z�\'«FXsT�] ¬��m{ ®hÚ Ö a Ö a Ö ó }@c � ZF] � X�©!Z �8¬ W � T V�©!X � � � TÔX � Ú © � \ � W � WYXÍAs®�ÞF]_W �Ó�7H6B5 ã � � WhW �?� ©!Z �2¬ W � T�XsT ¬ ` � W � [sTÔX � 7H6B5 W Ö

�+Ð�� óØÉ2¥j�?±L��½h¸�º ´3�?§ÅÉ�Ç�Â?º+�?Á �?ºU�g§��÷1�·÷øö $åL �'�!ýX ´�.�Qü:���.�s����ú���� L �Q�����]üN�

Ý ©!Z � ®Y©!X�XsTD!�� � W �F�Ó� ®h] ��� \^WhXb� ¬ W � ]�­�XsT ¬�� Þb` � ] � ZFWEWhX � Wh­!] � � ���+� T �ج ¨ �h¬ Wh®h� � ©!XF] � Z�W3[FZ® T ¬ © � ]_\^ßj� � WKcH®jÚ Ö a Ö a Ö S Ö S]c ¬ W � ] � [FW � ��T ¬ [�©!]_�vrh� � W [ � ��W � \^]_X � Ö8: W � ]�WY[�W � �T ¬ [�¨ ZFXFW#V!©!]_W�Y¬ Wh®h� � ©!XF] � ZFWe®h© ��� W �Ó� ©!X�[ k�¬ T�®�ÞsT � ­!W;\ØW � Z ��� W � T �D¬ ¨ 6B@o7 WhX ¬ ¨ªT�« � WYXF®hWB[FW � ]�­�XsT ¬ Ö=7 ¨ W � �¬ Ws> ÜY�h� ©K? �h¬ WY®j� � ©!XF] � ZFWH[FZU® T�XFT ¬ WhX � ZFW � �]�©�X Ö�G ¬ W � �K]�\ � © � ��T�Xb�g[FW�®h©!XFXsT.!�� � W �F�Ó� ®h] ��� \^WhXb�� T � © � ]��]�©�X � ZF]�[ � �W � \Ø]�XFW ¬ T � ZsTÔX���]_� ��kÕ� ©!Z � � � T�] � W � ©!Z � \ØW � Z � W �B¬ W � ]_­!XsT ¬Í� Þb` � ] � ZFW ÖÝ ©!Z � ®hWh�Ó�W T�XsT ¬ ` � WKc ¬ W �B� ] � [FW � ��T�Z=i � ©!Xb�®h©!\ ��� ] � WYXb� � W ± S�kÕ®Y©!Z ��� 6;@o7;Ö @ ©�XF® � ©!Z ����Y¬ WY®j�]�©�XFXFW ��¬ W � ] � [FW � �T ¬ c�©!X � © � W ¬ W � ®Y©!Z � Z � W � \Ø]�XF]_\ T ¬ W �X{ 6B@B7 \^]_X7}Wj��\^T0i4]�\^T ¬ W �{ 6B@B7 \ T0i�} � Z�]_VÔT�Xb�W �8� Z �?¬ W � ®Y©!Z ��� 6;@o7 � ©!Z � ®�ÞsT � ZFW � ]_­!XsT ¬ |

� 6B@o7 \Ø]�XFk F ã S!k'c 6B@o7 \Ø]�X~P F ã S!k]c 6B@o7 \Ø]�X�a F ã S!k]c � ©!Z ��� W �Ó� Wh®h�]�V!Wh\^WhX�� ¬ W� ]_­!XsT ¬ J c A Wj� :fÖ

� 6B@o7 \^T0i�k F S!k,c 6B@o7 \^T0i�P F S!k]c 6;@o7 \ T�isa F S!k'c � ©!Z ��� W �Ó� Wh®h�]�V!Wh\^WhX�� ¬ W� ]_­!XsT ¬ J c A Wj� :fÖ

n X�©!«���]�WYXb�M[FWYZ=i�� ` � W � [�W�[F] � � � ]�«�Z��]_©!X � [FW � ] � [FW � ��T ¬ c?V�©!] � As­ Ö·�FÖ a | ¬ W � [F] � � � ]_«FZ ã�]�©�X �Í� � � ©!]_��W � ®Y© �Ó� W �Ó� ©�XF[FWYXb�KTÔZ4i�® T�XsTÔZ4i �Y¬ Wh®h� � ©!\^T�­!X � �] � Z�W � ��Wh� ¬ W � [F] � � � ]�«FZ4�]�©�X � �F¬ Z �¬ T � ­!W � ®h© ��� W �Ó� ©!X�[FWYXb�LT�Z4i'® T�XsTÔZ4iUÞsTÔ[ � ©!X�] � ZFW � Ö�7 Wh�Ó�W?[F]Bn �h� WYX�®YW2W � �K[FZFW?T�Z=iU® T � T�®Y]�� �h�[FW � ® TÔXsT�Z4i+ÞFT�[ � ©�XF] � ZFW ��� ZF] � ©!Xb� ��¬ Z � ]_\ � © � �T�Xb�W � Ö��÷1�·÷�� �gL �¼�5�7���¼�s���Qú ����Vs�QüN�

: T?V � T�]�WfVÔT ¬ WYZ � [FW ��� ]_­!XsT�Z=iic�®h© ��� W ��� ©!XF[FT�Xb� ke¬ T2[F]Dn �Y� WYXF®hWHWYXb� � W ¬ T?VÔT ¬ WYZ � [FZ � ]_­!XsT ¬\^W � Z �Ó� W � T ��¬ ¨ 6B@o7 Wj� ¬ T�V�T ¬ WYZ � \Ø©�`�WYXFX�Wo[FW ��� ] � [�W � �T�Z4i*csT � � � ®YT ¬ ®hZ ¬�� W � ©!Z � ®�ÞFT � ZFW® T�XsT ¬ Ö Ý T �L¬ T � ZF]_��Wdc ¬ W � � � ©!] �D� ]�­!XFT�Z4iØ[FW8®�ÞsT � ZFWB®YT�XsT ¬ ©!Xb� � � � T�ÒÓZ � � �h� T V!Wh®;ZFXFWe®Y©!Z � «áW[FW ��� Ú �h� WhXF®YW � ]_\'Z ¬�� W � ZF]F�]_WYXb�K®Y©!\ � ��W8[�W � ® T � T�®h� �Y� ] � ��] � ZFW � [FW?®�ÞsT � Z�We®YT�XsT ¬1{ ® T � TÔ®Y]_� � c� ` � W�[�W �F��� T�\ �F¬ ]BAs® TÔ��WYZ � c ¬ ©!X�­!ZFWYZ � [FW � ®q�Ô« ¬ W � Wh��® Ö }fcá®hÚJAs­ Ö��Ö P Ö�: ¨ TRÒÓZ � ��WY\ØWYXb�;� � ©!Z�V�W¬ W;\ØWY] ¬�¬ WYZ � �Wh\ ����� W � \ØWh�Ó��T�Xb�2[�¨ªT V!©!] � ZFXFW ¬ WY®j�Z � WB© � ��]�\^T ¬ W8[FW ¬ T�VÔT ¬ WhZ � \^T0i4]�\^T ¬ W8[�W¬ ¨ªT�\ ��¬ ]_��ZF[FWg[FZ � ]�­�XsT ¬ Ö Ý ©!Z � ®�ÞFT � ZFWL®YT�XsT ¬ c ¬ ¨ªT�ÒÓZ � �Wh\^WhX��gT � � �K��� T ¬ ] �Ó�Ä� Z �g¬ T�[F] � � � ]�«FZ���]�©!X[FW �g� T ��� © � � � [FW ��� ]_­!XsT�Z=i A � J Wh� : � J�Ö�: ¨ T VÔT�Xb��TÔ­!WL[~¨ªZ���] ¬ ] � W ��¬ T � T �F� © � �g[FW �Í� ]�­!XsTÔZ4i�W � �� Z�WB®YW ¬ ZF] ã ®Y]�W � � �F� TÔ�] � ZFWY\ØWYXb�2]_XF[ �Y� WYX�[sT�Xb�2[FZ � ] � [�W � �T ¬ c=©!ZÕ[�W � [F]Bn �h� WYXb��W � ®h©!Z � Z � W � Ö

Q ô

Page 69: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

î -kïAôi-$4.-=8�f+89(:z'06/32$ew-$B$4�f�06bs;k<.($E

î aDïÂôi-$4.-=8oõ.-k_?/32$4�bs;7<�($E{|~}w�û�FÖ a�� @ ] � � � ]�«FZ4�]�©�X,� ` � ] � ZFWE[FW �3� ] � [FW � �T�Z4i � ©!Z � ZFX*®YT�XsT ¬e�Y¬ Wh®h� � ©!\^T�­!X � �] � Z�W�FÖ a { T�}DWh�8ÞsT�[ � ©!XF] � Z�W ��Ö a { «7} Ö

Q!c

Page 70: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

î -7ï�ö.-$z�06(+<�/3*5_�(Nz�2$/3/3(+z'03b92k4Î,"2$<�/58C(cz�õ.÷$*3*6bC*i4q<�egf�/32hø?E

î aDï�öD-$z�06(�<./3*5_?(Nz�2$/3/6(:z'03b92k4Î,"2$<�/�032$<.*�8C(+*Az�õD÷$*3*1bs*�E{|~}w���FÖ S[� : W � ÚwTÔ®h�WhZ ��� [FW+®Y© ��� Wh®h��]�©!X � ©�Z �U¬ W � [�©!XFX � W � T�XsT ¬ ` �Ó� W � [FW+Ú � V � ]�W � aÔk!k!Q]c� ©!Z �D¬ W?®�Þ�� ��� ] � X=Z�\ �h� ©�a�As­ Ö���Ö S { T�}ÄWYX � ®�ÞFW ¬�¬ W ¬ ]�X � T�] � Wdc!Wj� � ©!Z � �©�Z �K¬ W � P�ao®�Þ�� �Ó� ] � As­ Ö�FÖ S { «7}HWhX � ®�ÞFW ¬_¬ W ¬ ©!­!T � ]��ÞF\Ø] � ZFW Ö

Q!l

Page 71: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

î -7ïiùX<�(N_om (�4.*6(�ea�89(c_?(:*�uÞ-$z�06(+<�/3*5_�(`z�2$/3/6(:z'03b92k4¼E

î aDï�ú�b9û"f+/6(+4.z�(N_?(`8s-jej2xdk(�4�4.(`_�(+*iuÞ-$z�06(+<�/3*5_�(Nz�2$/3/3(+z'03b92k4¼E{|~}w�K�FÖ�� � ��Ö�� { T�}�V4Z�W�[�¨ WYX � WY\'« ¬ WH[FW � ÚwT�®j�WYZ ��� [FWL®Y© �Ó� Wh®h�]_©!X | ¬ T �F� Wh\^]_ß � W ¬ ]_­!XFW {w� ©!ZF­!Wq}]�XF[�] � ZFW ¬ W#X�ZF\ �Y� ©,[FZ�®�Þ�� ��� ] � � ¬ T [FWYZ=i�]_ßY\ØW { « ¬ WhZFW§}@c2� � ©�] � ]_ßY\ØW { XF©�] � Wq}fc � ZsTÔ� � ]_ßY\ØW{ © � T�XF­!Wq}fcfWj�Õ®Y]_X � ZF]�ßh\^W { V!W � �Wq} ¬ ]_­!XFW � ]_XF[F] � ZFWhXb� ¬ W � ÚwT�®h��WYZ �Ó� [FWM®Y© �Ó� WY®j�]_©!X-®YT ¬ ®hZ ¬��h�� ©�Z �H¬ W � [F©�XFX � W � ®Y© ¬_¬ Wh®h� � W ��� W �Ó� Wh®h�]�V!Wh\^WhX��?WhX3Ú � V � ]_W � Wj�2[ � ®YWY\�« � W�a�k�k!Q]c�Ú � V � ]_W � a�k�k ôWh�K\^T�]�a�k�k!c Öd��Ö�� { «7}�[F]Bn �h� WYX�®YW?[FW ¬ TB\Ø©R`!WYX�XFWe[�W � ÚwT�®h��WYZ �Ó� [FW?®Y© �Ó� WY®j�]_©!X | WYXb� � W?Ú � V � ]�W �a�k!k!QWh�LÚ � V � ]_W � a�k!k ô { « ¬ WYZFWq}*�4WhXb� � W;[ � ®hWY\'« � WBWh�LÚ � V � ]_W � a�k!k!Q {w� ©!ZF­!Wq}*�4Wj��WhX�� � W;Ú � V � ]�W �a�k!k!Q'Wj�8\ T�] a�k!k!c { V!W � �Wq} Ö

ô k

Page 72: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

�+Ð�� Ê É�����³�Á ½hº�£o��½j¸�º ´3�?§üHÔ£�±L���?¶Õ³Ä§°´3�¼±H¸³Í³Í�?±L��½j¸�º: ¨ªT�ÒÓZ � �WY\ØWYXb� � W � \ØWh�B[FWU®Y© �Ó� ]_­!W �e¬ W���WY\ �F� [FW ¬ Wh®h��Z � WKc�Wh�TÔ]�X � ]�[FWU[ � �W � \Ø]�XFW �B¬ W �ÚwT�®h��WYZ �Ó� [�W8®h© ��� WY®j�]�©�X � ©!Z � ®�ÞsT � ZFW8® T�XsT ¬ Öb: T£As­!Z � W �FÖ S\Ø©!Xb� � W ¬ W � ÚwT�®h��WYZ �Ó� [�W8®h© ��� WY® ã�]�©�X3©!«��WhX�Z �?� ©!Z �2¬ WB®�Þ�� ��� ] � X=Z�\ �h� ©^a�Wh� � ©!Z � ��©!Z �2¬ W � ®�Þ�� �Ó� ] � Ö�: T�AF­!Z � W ��Ö�� \Ø©!Xb� � W

¬ ¨ WYX � WY\'« ¬ W�[FW � ÚwT�®h��WYZ �Ó� [FW2®Y© �Ó� Wh®h�]_©!XU® T ¬ ®YZ ¬��Y��� ©!Z � ®�ÞsT � ZFW?®�Þ�� �Ó� ] � Wh� � ©!Z � ®�ÞsT � Z�W �á�jã� ]�©=[FW ÖsA XE­ � X �Y� T ¬ c �F¬ Z � [FW�l!k � [FW � ®YT�XsT�Z=i�©!Xb�eZ�XMÚwT�®j�WYZ � [�W�®h© ��� WY®h��]�©!X � Z ���h� ]�WhZ ��kk Ö l�l!Q Ö=n X^� � ©!Z�V�W � ­bT ¬ Wh\^WhXb� � Z � ®hWh�Ó�W�AF­!Z � WKc ¬ T[F]Dn �Y� WYXF®hW;[FW ¬ To\^©R`�WYXFXFW;[FW � ÚwT�®h��WYZ �Ó�[FW?®Y© �Ó� WY®j�]_©!X ® T ¬ ®YZ ¬_�Y�K� ©�Z � [F]Dn �Y� WYXb�W � ®h©!\'«F]_XsT�] � ©!X � [�W ��� ZFTÔ� � W � ®�ÞsT�Xb�] ¬�¬ ©!X � T�XsT ¬ ` ���h�{ ®hÚ Ög�FÖ a^}@c=®hWh�Ó�W;[�]Dn �Y� WhXF®YW8W � � �F� ©4®�Þ�W;[FW;k Ö47 W ¬ T\Ø©!Xb� � W � ZFW ¬ W � ÚwT�®h��WYZ �Ó� [FWe®Y© �Ó� Wh®h�]_©!X!cWYX �F¬ Z � [~¨�rj� � WÚwT�]_« ¬ W � c � ©!Xb� � ��TÔ« ¬ W � [FT�X �?¬ WB��WY\ �F� Ö

�+Ð:æ ¢è¸�º+±H¥h¶+§ ½h¸�º9 XFW2\ � �Þ�©4[FW � W � V�TÔX�� k ®h© ��� ]�­!W ��¬ TB\ØW � Z � W2[�W ¬ ¨ � XFW � ­!]_W � T �Ĭ W�® T ¬ © � ]�\Øßh� � W�T � � � [ ��ã��T�] ¬�¬�� W Ö!7 Wh����W � �ZF[�W;T\^©�X�� ���·� ZFW ¬ T �F¬ Z � T � �K[FW � ÚwTÔ®h�WhZ ��� [FW?®Y© �Ó� Wh®h�]_©!X � ©!Xb� � Wj�]_� � cbWj�

� Z�W ¬ WYZ �Ó� V�T � ] T0�]�©�X � [sTÔX �K¬ W��Wh\ ���f� ©!Xb�DX � ­ ¬ ]�­�W T�« ¬ W � Öb7 W � ÚwT�®j�WYZ ��� [FW?®Y© �Ó� Wh®h�]_©!X X�¨ ©!Xb�[F©!XF® � T �8� � � Z���] ¬ ] ���h� ® T � ] ¬��L� ©!Xb� �F� TÔ�] � Z�WY\ØWYXb�?]�[FWhXb�] � ZFW � T�Z4i3ÚwTÔ®h�WhZ ��� [�W�®h© ��� WY®j�]�©�X� ��TÔ« ¬ ] ���F��� ® � [FWY\Ø\^WhXb�Xô Q ó õ Ö

ô P

Page 73: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

� � æ �¾ðáî�ò�ê ý

� ê-òÕîMð@þî` æïîMð!u a ëÈê éhé!ð ëÈê�a îMð@þî` æïîMð!u a ëÈê-ì� é�ê�` î+ò0u a ì ë æ a ì é�ê ` æ é!u¤òEð í ñ î�òMê

�Z�s�â�'���â�'�§��Ç� � Å��fÄ���i��ÿfÃ1 �Ï3 g¡*���·¢��Ê1���x���£�£���£�£�Q���£�£���£�£���Q�£��� Ýg§��F ëâÈqÄ* g¡]�fÆÇ���Ç�'¡*Ìm�i�M�i�'¡i¡ÅK��Ì��£�Q���£�£���£�£�Q���£�£���£�£���Q�£��� Ý�Ù§��¨Ù ��Åd�Ç��ȧ�fÆÇ�'¡Û�i��Ì�Å�Ü'�K¡*�KËv�K¡]�@ÌZ�Q���£�£���£�£�Q���£�£���£�£���Q�£��� Ý^ì§�� ì �%�KÌ Å"Ü]�K¡*�KËv�K¡]�@Ì Ì~ÆÇË|Úi�ÇÅ�Ì3�£�Q���£�£���£�£�Q���£�£���£�£���Q�£��� ݼ§§��v§ �%�2Ê*¢qÚiÆB���i�MÉ&�'¡*�ZË|Ú*�D�fÆ Û����\�Q���£�£���£�£�Q���£�£���£�£���Q�£��� ݼ§§�� ß ���*�d¡]�fÆ��!È" ^�fÆÇ�'¡5�i��ÌmÅd�D�Kȧ�@¢�'¡*Ì0���£�£���£�£�Q���£�£���£�£���Q�£��� Ýoß

ë^¦ �^¦¨¥ ß;¯±»¨²�¥�¯.ª�«�¿�ªh«.Ó�³Fª�½�²±»Fµq¶ ¦h¦·¦h¦·¦e¦h¦·¦h¦·¦h¦·¦·¦h¦e¦h¦·¦h¦·¦·¦h¦ áq�ë^¦ �^¦º¹ �� ½@®q½�»¨².Ó�«�¿� »F¿�ª�¶K²±» ��½@®²±»Fµq¶Á¦·¦e¦h¦·¦h¦·¦h¦·¦·¦h¦e¦h¦·¦h¦·¦·¦h¦ á§áë^¦ �^¦ºÞ ßàµq¯±¯.ª�½�²±»Fµq¶<¿�ª�«sª�� ½@®q½�»¨².Ó�«�¦h¦·¦e¦h¦·¦h¦·¦h¦·¦·¦h¦e¦h¦·¦h¦·¦·¦h¦ á§á

§��DÝ íe�'¡*È���ÚÌ~ÆD�]¡2���£�Q�£���£�£���£�Q���£�£���£�£�Q���£�£���£�£���Q�£��� ÝoÝ

: ¨ªT�ZF­�\^WhX��TÔ�]_©!X�[�W ¬ T ¬ ZF\Ø]�XF© � ]_� � TÔZ d Z�X G�G T;X � ®YW �Ó� ]�� � [FW2XF©�\'« � WhZ4i�®�ÞsT�XF­!Wh\^WhXb� �T�Z+XF]_V�W T�Z�[FZM[ � ��WY®h��WYZ � c � Z�]g©�X�� � � � \^WhXb�]�©�XFX �Y� T�Z�®�ÞsT � ]_� � W�a Ö a Ö S Öá7 W � ®�ÞsT�XF­!Wh\^WhXb� �®Y©!X�®YW � XFWYXb� � ­!T ¬ Wh\^WhX�� ¬ W � ® � ]��ß � W � [FW �Ó�Y¬ WY®h��]�©!X Wj� [�¨ ]�[FWhX���]DAs®YTÔ�]_©!XÑ[FW � �Y¬ Wh®h� � ©!X � ÖK7 W®�ÞsT � ]�� � W�[ � ® � ]_� ¬ W � \^©R`�WYX � \^] � WYX���Z4V � W � ©!Z � ®hW � �]DAFW �?¬ ¨ ]�[FWhXb�]DAF® TÔ��]�©!X3[FW �e�h¬ Wh®h� � ©!X � c[sT�X �;¬ T � T � ��]�W�®hWYXb� � T ¬ W { 727 };Wj� ¬ W �B� T � �]_W � T VÔT�Xb� { AL7 }8[FZ¹® T ¬ © � ]_\^ßj� � Wdc � ©!Z �;¬ W d ZFXG�G « Ö�N T�®Y©!Xb� � ]�«FZ4�]�©�X k�¬ T�®hW � ��]DAs®YTÔ�]_©!XØ[FW ¬ ¨ª]_[FWYXb�]BAs® T0�]�©�X^[FW �H�h¬ WY®j� � ©!X � [FT�X ��¬ T �Ó� ­!]_©!X]�Xb�W �Ûã ® � `�© � �TÔ� { GÛ7�d } [FZ�®YT ¬ © � ]�\Øßh� � Wdc � ZF]BW � � ¬ W ®h©!\ �F¬�� \^WhX��Õ[FW¹®YWj���W T�XFT ¬ ` � WKcHW � ��F���h� WhX�� � W ���h� T ��� \^WhXb�;[sTÔX �?¬ Wo®�ÞsT � ]_� � W�Q Ö

æØÐ ð ò É��g²3¸Ø´+���gÏ £¿ £�º�´ � ³�¸�·¹���: W � ® � ]_�ß � W � [FW ���h¬ Wh®h�]_©!X3[FW �2�Y¬ Wh®h� � ©!X �û� Z�]�©!Xb� � � � [ � AFXF] �2� ©!Z ��¬ W d ZFX G�G T'XFW � ©!Xb�

� T � T ���F� © ��� ] �h�f� ©�Z �f¬ W d ZFX G�G « Ö!A XØW~n�Wh�c k ® T�Z � W8[FW ¬ ¨ªT�ZF­!\ØWYXb�TÔ�]_©!X'[FW ¬ T ¬ ZF\Ø]�XF© � ]_� � c©!X-©�« � W � V!WMZFXFWM«sT�] �Ó� WM[FW � W C ® T�®h]_� �Y� � ©!Z�VÔT�Xb� TÔ����WY]_XF[ � W PRk � [FT�X �ج W � [F©!X�X � W � [FZd Z�X G�G «!c�V!©�] � AF­!Z � W ó4Ö P Ö�: ¨ WYX0ÒÓWhZ [FWÕ®hWh����W3T�XsT ¬ ` � W^W � �'[F©!XF®Õ[�W [ � AsXF] � [FWÕXF©�Z�V!W ¬�¬ W �®Y©!Z � Z � W �f� ©�Z ��¬ W d ZFX G�G «!c�T V!WY®?[FW � VÔT � ]�T�« ¬ W ��� WYZ � WYX � ]�« ¬ W �JkB¬ T ¬ ZF\^]_XF© � ]_� � [�¨ ZFXFW � T � �cWh� � ZF] ©dn � WhXb�eZ�XM«á©!X � T ��� © � � � ]_­!XsT ¬~� Z � « � ZF]_�?[FWoÚ ©!X�[�[~¨ T�Z4� � W � T � � ô Q!Q�õ Ö�A XM­ � X �Y� T ¬ cô a

Page 74: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

ÝÍ�h� ]_©4[FW C ä�]_\d ZFX GÓG «�P 72CFà��e7H6B5�� a ADN ÞF]_­!Þ � � � Ý 6oC�C a � � a4P Ö PRk Ö k!k{ ÒÓZ�]�XMa�k!k!Q ã TÔ©�¶��;a�k!k ô }d ZFX GÓG «�a 72CFà��;7H6;5�� a ADN ÞF]_­!Þ � � � Ý 6oCFC���� � a4P Ö PRk Ö k!k � � a�k Ö P�a Ö k!k{ ©=®h��©!« � W�aÔk!k ô ã Ú � V � ]�W � a�k�k!c�} 72CFà��;7H6;5�� a ADN ÞF]_­!Þ � � � Ý 6oCFC���� � a4P Ö PRk Ö k!k � � a�k Ö P�a Ö k�P72CFà��;7H6;5�� a ADN ÞF]_­!Þ � � � Ý 6oCFC���� � a4P Ö PRk Ö k!k � � a�k Ö P�a Ö kba

��� ���ó=Ö P�� C ä�]�\ � Z��] ¬ ] ���Y�2� ©!Z �2¬ ¨ TÔXsT ¬ ` � Wo[FZ d ZFX G�G « Ö

� ©!Z � ® T ¬ ®YZ ¬ W �L¬ W � W C ® T�®h]_� �Y� [�¨ ]�[FWhXb�]DAF® TÔ��]�©!XÕ[�W �?�Y¬ WY®h� � ©!X � c�©�X�Z4�] ¬ ] � W ¬ T�\ � �ÞF©=[FWe> < TÔ­T�XF[ Ýf� ©�«�W@?|ô Q ô õ Ö�@ ¨ªT�«�© � [!cá©!X �Ó�Y¬ Wh®h��]�©!XFX�W�[FW �B� V�ßYXFWh\^WhX�� �� © �Ó��� [sT�Xb�T�Z \Ø©!]_X � [FWYZ4i�Y¬ Wh®h� � ©!X � ] �Ó� Z � [FW ¬ TU[ �Y� ]�Xb� � ­ � T0�]�©�XM[�¨ ZFX «á© � ©!X P csWj�;[F©�X�� ¬ T \^T ��� W�]_X�VÔT � ] T�Xb��W�T �F� ß �� WY®h©!X � � � Z�®h�]_©!X � WU� � ©!Z�V!WØ[sT�X ��¬ T Ú WYX�rj� � W^[FW \^T ��� W [FZ#«�© � ©!X P c�®�¨ W � � ã.k�ã [F] � W c!k à WyO� Mee

� PRk�k à WyO ��WYX � ZF]��Wdc ¬ ¨ ZFX [FW � [FWYZ=i �Y¬ WY®j� � ©�X � c ¬ W#> < TÔ­K?�c � ZF]H[F©�]_� � T ��� W � [FW �®Y©!Z � Z � W � � � ß ��� W ���Ó� W �2{ < ]_­!Þb�@}@c � W � � k�� �] � ZFWj�W ��¬ WU[FWYZ4i4]_ßY\ØW �h¬ Wh®h� � ©!X�TKAsX [FW ��� [�ZF] � W¬ W�« � ZF]��B[FW�Ú ©�XF[�� ¬ ¨ T�Z4� � W �Y¬ WY®h� � ©!Xic ¬ W�> Ýf� ©�«�W@?�c~[�©!]_� � T �Ó� W � [�W � ®Y©�Z � Z � W � T �F��� © �F� ] � W � c[ �Y� WYXF[FT�Xb�;[FW ¬ ¨ªW C ®YT�®Y]�� �mk [ � �W � \^]_XFW � �FWYX]AFX!c ¬ ¨ W C ® T�®h]_� � ε

W � �8® T ¬ ®YZ ¬_� W � T � |

ε =Npass

Npass + Nfail, { ó=Ö P"}

Npass[ �h� ]_­!XFW ¬ WBXF©!\'« � WB[FW �?�Y¬ Wh®h� � ©!X �H�F� ©!«áW �h� ZF]~©!Xb� � T ���Ó�o¬ W � ®Y©!Z � Z � W � T �F�F� © �F� ] � W �[FW ¬ ¨ W C ® T�®h]_� �mk [ � �W � \Ø]�XFW � cFWj� Nfail

®Y© �Ó� W ��� ©!XF[ k ®hWYZ4i � ZF] ©!Xb� � ®�Þ�©!Z � Ö

æØÐ:G ó1±f²+£�ºU��½h¥j¥j¸�º+§ ´3�¼´3¸�º+º+É2�?§�3ü�1�gû�ø���ã ¬ ¨ � ��ZF[FW � © � �W � Z � [FW ��� ®�ÞsT�Xb�] ¬�¬ ©!X � [FWB[F©�XFX � W � [FZ d ZFX G�G « { � ©!Z � ®YWj����WT�XsT ¬ ` � Wdc ¬ W d ZFX G�G « � W®Y©�\ � © � W;[FZ d ZFX GÓG «�PWh�?ZFXFW � T � �]_WB[FZ d ZFX G�G «�a'c�®hÚ Ö a Ö a Ö a Ö S^}fcWYX � WY­!] � � �Ó�Y� WYXb� � W2ÒÓZ�]�XMa�k!k!Q Wh�?Ú � V � ]�W � aÔk!k!c]cFV�©!] � �T�« ¬ WYT�Z ó4Ö P Öá: W � [�©!XFX � W � ©!Xb� � � ��� W ã®Y©!X � � � ZF]_��W � T V�WY® ¬ W �F� ©!­ � TÔ\^\ØWe[�W � Wh®Y©!X � � � ZF®h��]�©!X [FW @�� { [Fk � Wh®Y©g}@c { ®jÚ Ö a Ö a Ö ó }@c�TÔ[sT � � �

k ¬ T'ÞsT�Z���W ¬ ZF\Ø]�XF© � ]_� � Ö7 Wh����W?T�XsT ¬ ` � W2T � � �2��� T ¬ ] ��� WHWYX Z���] ¬ ] � TÔX�� ¬ W �Ä� ä�]_\ � a ADN ÞF]�­�Þ�� � �K[FZ d ZFX G�G «ic { ®jÚ Ö a Ö a Ö ó } Ö7 WÕ[FW � XF]�W � W � �'Ú © � \ � [�¨ � V!ßhXFWY\ØWYXb� � T V�WY®+T�ZÑ\Ø©!]_X � [�WYZ4iÑ©!«=ÒÓWh� �'�Y¬ WY®j� � ©�\ T�­�X � ��] � ZFW �[�¨ª]_\ � Z ¬�� ]�©!X � � T�X � V!W ��� W � Z ���h� ]�WhZ � W k P�a à WyO Ö

� ÷0ÿgý ù�ö�ø|� ü�gö � ÿ1�{ù�ý ø�ù�ã ¬ W?« � ZF]_�D[FW?Ú ©!XF[Ø\'Z ¬ �] ÒÓWj� { ©�Z|N 7�@ } { ®hÚ Ö=ô=Ö�� }ÄW � � ���Y¬ WY® ã�]�©�XFX ��ke� T � �] � [�¨ªZ�X'T�Z�� � W � ®�ÞsTÔX���] ¬_¬ ©!X�[FWD[F©!XFX � W � c ¬ W � ä=]_\ N 7�@�Ö�7 WL[FW � XF]�W � ®h©!\ �F� WhXF[¬ W �� V!ßYX�WY\ØWYXb� � T `!T�Xb�UT�Z�\^©!]_X � ZFX3ÒÓWh��[�¨ª]_\ � Z ¬�� ]�©!X � � T�X � V!W ��� W � Z �á�Y� ]�WYZ � W k c à WyO\�] ¬�� [F©!]�V!WhX���T V!©!] � [ � ® ¬ WhXF®�Þ � T�Z \^©!]_X � ZFXÕ[FW � � � ]_­!­!W ���D� ]�\ �F¬ W � ©!ZÕ[F©!Z�« ¬ W � [FW � ÒÓWh� � c { ¬ W �� � ]_­!­!W ���;� ]�\ �F¬ W � Wj�o[F©!ZF« ¬ W � [FW � ÒÓWj� �B� W � ZF]�ß � WhX�� � W �Ó� Wh®h�]�V!Wh\^WhX���ZFX¹Wj�o[FWhZ4i^ÒÓWj� � [sT�X �¬ W ��� V�ßYXFWh\^WhX�� � } ÖK: W �'� ®�ÞFT�Xb�] ¬_¬ ©!X � [FW [F©!XFX � W � Z���] ¬ ] ���h��� ©!Z �����h¬ WY®j�]_©!XFXFW ��¬ W^« � Z�]_�'[�WÚ ©!XF[+\'Z ¬ �] ÒÓWj� � ©�X�� � WY­ � ©!Z �á�Y� [sT�X �?¬ WB��T�« ¬ W T�Z ó4Ö a Ö: ¨ WYX � WY\�« ¬ W?[FW �D� ®�ÞsT�Xb�] ¬�¬ ©!X � [FW?[F©�XFX � W � Z��] ¬ ] �Ó�Y�Ä� ©!Z � ®hWh�Ó�W8T�XsT ¬ ` � W � ©�X�� � ©!Z �K¬ T;Ú © � \^W[FW�As®�ÞF]�W ��� 7H6B5 ã � � WYW � csWh�8] ¬�� ©!Xb� � � � T�XsT ¬ ` �Ó�Y� [sT�X � 7H6;5 Wdc { ®jÚ Ö a Ö a Ö ó } Ö

ô S

Page 75: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

ÝÍ�h� ]_©4[FW C ä=]_\d ZFX G�G «�a 72CFà��;7H6;5�� N 7�@�� Ý 6oC�C'��� � a4P Ö PRk Ö k!k � � aÔk Ö PRa Ö k�k{ ©=®h��©!« � W�a�k!k ô ã Ú � V � ]�W � aÔk!k!c�} 72CFà��;7H6;5�� N 7�@�� Ý 6oC�C'��� � a4P Ö PRk Ö k!k � � aÔk Ö PRa Ö k4P72CFà��;7H6;5�� N 7�@�� Ý 6oC�C'��� � a4P Ö PRk Ö k!k � � aÔk Ö PRa Ö k!a��� �Fó=Ö a�� C ä�]�\ � Z��] ¬ ] ���Y�K� ©!Z �D¬ W �H���h¬ Wh®h�]_©!XØ[FZÕ« � ZF]_�L[FW?Ú ©!XF[Õ\'Z ¬ �] ÒÓWh�c � ©�Z �L¬ ¨ TÔXsT ¬ ` � W[FZ d Z�X GÓG « ÖæØÐ�� óØÉ2¥j�?±L��½j¸�º ´3�?§ É�Ç�Â?º3�?Á �?º �g§

n X ���h¬ WY®j�]_©!XFXFW ¬ W ��� V!ßYX�WY\ØWYXb� � T `bTÔX��'T�Z \Ø©!]_X � ZFX �h¬ WY®j� � ©!X ®YT�XF[F]_[sTÔ� < T�­�Wh��ZFX�Y¬ WY®h� � ©!XM® T�X�[F]�[sT0� Ýf� ©�«�W Ö~: ¨ �Y¬ Wh®h� � ©!XM® T�XF[�]�[sTÔ� < T�­ [F©�]_� � T ��� W �e¬ W � ®Y©�Z � Z � W � [�¨ ]�[�WYXb�] ãAs® T0�]�©�XÕ� � ß �?��� V�ß � W �B� ZF]_VÔT�Xb�W � |

• T V!©�] � ZFXFW]�\ � Z ¬_� ]_©!X � � T�X � V!W �Ó� W � EMT � a ó à WyO\�

• T V!©�] � ZFX'� ` � W GI@ F P kB©!Z ± P�PJ� ¬ WD� ` � W GI@ � W � \^Wj�f[FW �Ó�Y¬ Wh®h��]�©!XFX�W � [FW � ® T�X�[F]�[sT0� �] ��� Z � [FW ¬ ¨ªT ¬ ­!© � ]��ÞF\ØW;[�W�® S XFW � ]�\ �F¬ WB[ � ® � ]��;[sTÔX �e¬ T � WY®j�]_©!XES Ö S ÖsG ¬ VÔT�Z���PRk � ] ¬ W®YT�XF[F]_[sTÔ�?W � �;Z�X � ÞF©��©�X!csWh���'P!P {{ã P!P"} � ] ®�¨ W � �eZFX � © � ]_� � ©!X { �Y¬ WY®h� � ©!X�}*�• � ©!XM] � © ¬ TÔ�]_©!XÕ[F©�]_�·rh� � W G � © � k Ö k ô �• ¬ T+Ú � T�®h��]�©!X [�¨ � XFW � ­!]_W � Z�¨ ] ¬ T�[ �Y� © ��� W [sTÔX ��¬ W ® T ¬ © � ]_\^ßj� � WU[�©!]_� rh� � WKc ADN Ú � T�® �k Ö l ô �• ¬ WØ®YT�XF[F]_[sTÔ� �h¬ WY®j� � ©!X < T�­�[F©!]���TRV�©!] � ZFX�WØ«á©!XFX�WØÚ © � \^WU[�WØ­�W � «áWØ[sT�X �¬ T � T � �]_W®hWYXb� � T ¬ W[FW® T ¬ © � ]�\Øßh� � Wdc m ã N TÔ� � ]�i ô � a�k'c { ®hÚ Ö � WY®j�]_©!XES Ö Sd}*�• G � © mB7û� � a à WyOXcf®Ô¨ªW � � ¬ ¨ ] � © ¬ TÔ��]�©!XÑ[�W � � � TÔ®YW � [FW � ©!«�ÒÓWh� �^�Y¬ WY®h� � ©!\^T�­!X � �] � ZFW � ÖA ¬�¬ WeW � �2[ � AsXF]_W � T �H¬ T � ©�\^\ØWe[�W ¬ ¨ ]�\ � Z ¬_� ]�©�X'� � TÔX � V�W ��� Wo[FW � � � TÔ®YW �H� traces

T

c { T V�WY®� traces

T � k Ö óBà WyO�}fc�[sT�X � ZFX'® S XFWH[�W � T `!©�XUk Ö k ó � R � k Ö�� T�Z���©!Z � [FW ¬ T8[F] � Wh®h�]_©!X[FW ¬ ¨ª©!«�ÒÓWh� �Y¬ WY®h� � ©!\^T�­!X � �] � ZFWdc=V!©!] � As­ Öáó4Ö aâ�• :�m ©=©=[sc � k Ö c]c ¬ ]_ä�W ¬ ]�Þ�©4©=[Ñ©!Z�\^T0i4]�\�ZF\Æ[FW�V � T�] � WY\�« ¬ T�X�®YW5ôªQ!c"õ ÖH7 ¨ªW � � ZFX�W �Iã��]�\^TÔ�WhZ � ®Y©�X � � � ZF]�� kÑ� T � ��] � [�W#c VÔT � ] T�« ¬ W � cH®h©!\^\ØW � T � Wji4WY\ �F¬ W ¬ ¨ª]_\ � Z ¬�� ]�©!X� � T�X � V!W ��� W��©��T ¬ W¹[FW � � � T�®hW � [sT�X � ZFX�® S XFW [FW � T `!©�X k Ö�� TÔZ��©!Z � [�W ¬ T � � T�®hW[FZ ® T�XF[�]�[sTÔ�c ¬ W � T �F� © � ��WYXb� � W ¬ ¨ � XFW � ­!]�WU� � T�X � V!W �Ó� WÕ[�Z ® TÔXF[F]�[FTÔ��Wj� ¬ ¨ª]_\ � Z ¬�� ]�©!X� � T�X � V!W ��� W[FW � � � T�®YW � c4©!ZÕWYX�®Y© � W ¬ W � m ã N TÔ� � ]�i k ô { 727 }LWj�2c { AD7 }DVÔT � ]�T�« ¬ W � Ö=: W: ]�äÔW ¬ ]�ÞF©=©4[�W � � Z��] ¬ ] �Ó�^� ©!Z ��¬ T �Ó�Y¬ WY®h��]�©!X [FW �U�h¬ WY®j� � ©!X �U� WhZ ¬ Wh\^WhXb�qc�®YT � ] ¬ Z���] ¬ ] � W¬ W �;��� © �F� ] � � �Y� [FW ¬ T � � T�®hW'T �Ó� ©=®Y] � W'TÔZ ® T�X�[F]�[sT0� { ¬ W �8� ÞF©Ô�©!X � XFW ¬ T�] �Ó� WhX�� � T � [FW� � T�®hW � [sT�X �K¬ W�� � T�ÒÓWh®h��©!­ � T � ÞFW§} Ö�A X ­ � X �Y� T ¬ ©!X [FWY\^T�XF[�W : ]_ä�W ¬ ]�ÞF©=©=[ � k Ö a�k � ©�Z �ZFX�W�]_[FWYXb��]DAs®YTÔ�]_©!X ¬ �Ô®�ÞFWdcÄWj� : ]�ä�W ¬ ]_ÞF©4©=[ � k Ö c � ©!Z � ZFXFW ���h¬ WY®j�]_©!X �F¬ Z �U��� V�ß � WdcV�©!] � As­ Öáó4Ö Sä�

• JeJ ã W ¬ Wh® ô � k Ö ô ôªQ�lKõpc�W � � ¬ T;VÔT � ]�T�« ¬ WL[FW � © � �]_W2[�¨ ZFX ���Y� W T�ZØ[FW?XFWhZ � ©!X�W ��{ ®jÚ Ö�ô4Ö ô4Ö Pq}� ZF] � W � \ØWh�L[FW �Ó�Y¬ Wh®h��]�©!XFX�W �H¬ W �D�Y¬ WY®h� � ©!X � [sT�X �H¬ T � T � �]�W8®YWhXb� � T ¬ W8[FZÕ® T ¬ © � ]�\Øßh� � W ÖG ¬ W � �H®h©!X � � � Z�]_� k�� T � �] � [FW � ô VÔT � ] T�« ¬ W �f� ZF]_VÔT�Xb��W � | ¬ TBÚ � T�®j�]�©�XØ[~¨ � XFW � ­!]�W8[ �Y� © �Ó� W[sTÔX �B¬ T �F� WY\Ø]�ß � W�®h©!ZF®�ÞFW�[FZ ® T ¬ © � ]�\Øßh� � W �Y¬ Wh®h� � ©!\^T�­!X � �] � Z�W { ALN P"}*� ¬ W�XF©!\'« � W[FWe®YW ¬�¬ Z ¬ W � ��©!ZF®�Þ � W � [FT�X �H¬ To®Y©!ZF®�Þ�W ADN P;[sTÔX � Z�XÕ® S X�We[FW � T `!©�XÕk Ö aû� ¬ ¨ ] � © ¬ TÔ��]�©!X

ôK�

Page 76: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

[FW � � � T�®hW �H{ G � © mB7û� }*� ¬ W;XF©!\'« � Wo[FWo®YW ¬�¬ Z ¬ W � [FW ¬ T�®Y©!ZF®�Þ�W ADN P[sTÔX � ZFX+® S XFWo[�W� T `!©�X ®Y©!\ �F� ] � WhXb� � W'k Ö aØWh�ok Ö�� TÔZ��©!Z � [FW ¬ T^[�] � Wh®h��]�©!XM[FZ¹® T�X�[F]�[sT0��� ¬ W�X�©!\'« � W[FW � � T�®hW � [sT�X � ZFX ® S X�W3[FW � T `!©�X k Ö k ó � ¬ W XF©!\'« � WÕ[�¨ªT�\^T � [sT�X �'¬ W 7 Ý C [sT�X �ZFX ® S XFW � TR`�©!X,k Ö PJ�fWj�ØZFXFW+®Y©!\�«F]�XsTÔ] � ©�X [FZ,X�©!\'« � W�[�W�®h©!Z �F� Wj�^[�W ¬ ¨ � XFW � ­!]�W\^W � Z �Ó� W8[sT�X �K¬ W 7 Ý C�Ö=: ToV�T � ] TÔ« ¬ W�[�W � © � ��]�W2[FW ���h� W TÔZ [FW?XFWhZ � ©!X�W � JeJ ã W ¬ Wh® ô W � �ZFX+XF©!\'« � Wo®Y©�\ �F� ] � WYXb� � WØP { � ]�®Ô¨ªW � �8[FZ � ]_­!XsT ¬ }DWh�8k { � ]�®Ô¨ªW � �8[FZ+« � Z�]_�2[FWBÚ ©�XF[7}fcV!©!] � As­ Ö�ó=Ö��FÖ: TEV�T � ] TÔ« ¬ W JeJ ã W ¬ Wh® S k ¬ T [�]Dn �Y� WhXF®YW+[FZ J;J ã W ¬ WY® ô W � �^Z4�] ¬ ] �Ó� W � ©!Z � ]_[FWYXb�]BAsW �¬ W �2�Y¬ Wh®h� � ©!X � [FT�X �?¬ W �8� T � ��]�W � T VÔT�Xb�?[FZ�® T ¬ © � ]_\^ßj� � W Ö4A ¬_¬ WBW � �8®Y©�X � � � ZF]��W kU� T � ��] �[FW � � � ©!] � VÔT � ]�T�« ¬ W �â� ZF] � ©�X�� ¬ W8XF©!\'« � W;[FWe®YW ¬�¬ Z ¬ W � �©�ZF®�Þ � W � [sT�X �L¬ T�®Y©!ZF®�Þ�W ADN P[sT�X � ZFX�® S XFW[FW � T `!©!XMk Ö a'c ¬ ¨ G � © mB7û� Wh� ¬ T m ã N T0� � ] i�c Ö

: ¨ �Y¬ WY®h� � ©!X�® TÔXF[F]�[FTÔ� Ýf� ©!«áWo[F©!]��8TRV�©!] �2¬ W �2�Ó��� ®Y]DAF®Y]_� �Y�?� Z�]_VÔT�Xb�W � |• � EM

T � PRk à WyO �• GI@ F PRkU©!Z ± P!PJ�• G � © � k Ö P ó �• ADN Ú � T�® � k Ö l�kä�• G � © m;7û� � Q à WyO Ö

: W �?�Y¬ Wh®h� � ©!X � ® TÔXF[F]�[FTÔ� � < T�­ Wh� ÝK� ©!«áW�[�©!]_V�WYXb� � W� � ©�Z�V!W � [sTÔX �?¬ W® T ¬ © � ]_\^ßj� � WB®YWhX�� � T ¬{ 727 }o[ � AsX�] � T � |ηdet| < 1.1

©!Z�«F]�WhX�[sTÔX ��¬ T �Ó� ­!]_©!X�TRVÔT�Xb��[FZ ®YT ¬ © � ]�\Øßh� � WU[ �h¬ ]_\^]�� � W� T � 1.5 < |ηdet| < 3.2

Ö4J ©���©!X �û� ZFW ¬ ¨ W C ® T�®h]_� � [FWe®YWh�Ó�W �����jã ���h¬ WY®j�]_©!XÕW � � �F� TÔ�] � ZFWY\ØWYXb�[FW PRk�k � ÖáA X'AsX!c � ©!Z �8��� [FZF] � W ¬ W�« � ZF]��;[�W�Ú ©!XF[E\'Z ¬ ��] ÒÓWj�qc ¬ TØ[F] � � � ]�«�Z��]_©!XM[�W ¬ T \^T ��� W]�XbVÔT � ]�T�Xb�W�[FW � ®hW � [FWhZ4i �Y¬ Wh®h� � ©!X � ® T�XF[�]�[sTÔ� � [F©�]_�<rh� � W ®Y©�X � ] � ��TÔX���W¹T V!Wh®¹®YW ¬_¬ WM[FW ¬ T\ T �Ó� W[FZ+«á© � ©!X P cF®Ô¨ªW � � ã±k0ã [�] � W � ZFW ¬�¬ Wo[F©!]_�·rj� � W�®h©!\ �F� ] � WoWYXb� � W�c!k à WyOèWj�PRk!k à WyO Ö

æØÐ�� ñ �?§ É�Ç'Â?º3�?Á �?ºU�g§ § ½hÁ ¶+¥jÉ?§: W ��� V!ßhXFWY\ØWYXb� � [FZ � ]�­�XsT ¬ Z → e+e−

©!Xb� � � � � ]_\'Z ¬��h� [sT�X �¬ ¨ª]_X���W � V�T ¬�¬ W�[FW \^T ��� W®Y©!\ �F� ] � WYXb� � WÕQ!k�Wh�^PRS!k à WyOÎT V!WY® ¬ W ­ � X �Y� T0�WYZ � [�¨ � V�ßYXFWh\^WhX�� Ý OB<?meG 6 { ®hÚ ÖÍô4Ö S Ö P§} Ö: ¨ � ®�ÞFT�Xb�] ¬_¬ ©!X�[�¨ � V�ßYXFWh\^WhXb� � � ]�\'Z ¬_�Y� Z���] ¬ ] ��� W � � ��� Ú �Y� WhXF® � [sT�X ��¬ T «sT � W�[�W�[F©�XFX � W �� T � 72CFà��e7H6B5��eN 7 V � ã ó!ó k ó a � � a4P Ö P!P Ö k!k Ö Ý T �2¬ T � ZF]_��Wdcs®hW �?� V�ßYXFWh\^WhX�� �;� ]�\'Z ¬_�Y�2� ©!Xb�� T ���Ó�Y�Ä� T �ͬ T8\MrY\ØWD®�ÞsTD! X�WH[FW � WY®h©!X � � � Z�®h�]_©!X�[Fk � Wh®Y© � ZFW ¬ W � [F©!XFX � W �h{ ®hÚ Ö a Ö a Ö ó } Ö0A X]AsXic� ©!Z ��� V=]_�W � ��©!Z � «F] TÔ] � c ¬ W ��� V�ßYXFWh\^WhX�� �'� ]_\'Z ¬_�Y� ©!Xb� � � �Ø���h¬ WY®j�]_©!XFX �h� T V!Wh® ¬ W � \MrY\ØW �®Y©!Z � Z � W � [�¨ ]�[�WYXb�]BAs® TÔ��]�©!X � ZFW ¬ W � [F©!XFX � W � c { ®hÚ Ösó4Ö S^} Ö

æØÐ:æ ñ �¼·3³�¶+½��À´3�àHÔ¸�º+´ Á ¶3¥j��½~á~���: W �B� V�ßYXFWh\^WhX�� � ®Y©!X � �]��ZsT�Xb� �B¬ W�« � ZF]��;[�W�Ú ©!XF[ \�Z ¬ ��] ÒÓWh�8[F©�]_V!WhXb�T V!©!] �;¬ W � ®YT � T�®j� ��ã

� ] � �] � Z�W �2� Z�]_VÔT�Xb�W � |• T V!©!] � T�Z+\^©!]_X � ZFX+® TÔXF[F]�[FTÔ� �Y¬ WY®h� � ©!X Ýf� ©!«áW:�

ô!ó

Page 77: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

• ¬ W^®YT�XF[F]_[sTÔ� Ýf� ©!«áW [F©�]_� rh� � WØ[F] � ��T�Xb��[FW^��©!Z ��¬ W � >I«á©!X � ?BÒÓWh� �|{ ®hÚ Ö S Ö�� }fc�[FW � © � ��W� ZFW ∆R(ηdet, φ) > 0.7�

• T V!©�] � T�Z�\^©�]�X � Z�X�«á©!XHÒÓWh�g[�¨ ]�\ � Z ¬_� ]_©!X;� � T�X � V!W �Ó� W � T � P ó?à WyO { T �F� ß � ®Y© �Ó� WY®j�]_©!X[FW ¬ ¨ � XFW � ­!]_W [FW � ÒÓWh� � cÍ®jÚ Ö S Ö�� }fc � ZF] � ©!]_��[F] � �T�Xb��[FZ ® T�XF[�]�[sTÔ� �h¬ WY®j� � ©!X Ýf� ©�«�W^[FW∆φ > 2.8

�• T V!©�] � ZFXFW � X�W � ­�]�WB� � T�X � V!W �Ó� W�\ T�X � ZFT�Xb�W 6ET

� PRk à WyO\�• ¬ T � WY®h©!X � � � Z�®h�]_©!X3[FW ¬ T'\ T �Ó� WB]_XbV�T � ] TÔX���WB[FZ3®YT�XF[F]_[sTÔ� �h¬ WY®j� � ©!X Ýf� ©!«áWT V!WY®®hW ¬�¬ W[FW�X�¨ ]�\ � © � �W � Z�¨ W ¬_¬ W�T�Z�� � W+® TÔXF[F]�[FTÔ� �Y¬ Wh®h� � ©!\^T�­!X � �] � Z�W {w� ¨ ] ¬ W�i4] � ��W§}'[F©!]��Mrh� � W]_X�Ú �Y� ]�WYZ � W {w� Z �á�Y� ]_WYZ � W§} k Q!k { PRS!k^} à WyO Ö

æØÐ�ç �á´3�?º ��½��M±�£o��½h¸�º ´3�?§ É2¥j�?±L� ³�¸�º+§�ä÷ �·÷¼ö � ýM�y��Ð!ý������Q� � L �.�5����.���: W � VÔT � ] T�« ¬ W � ®�ÞF©!] � ]_W ��� ©!Z � ®Y©�X � � � ZF] � W ¬ W � [F]Dn �Y� WYXb� � WYX � WY\'« ¬ W � [FW [ � AsXF]��]_©!X�[�W �

�Y¬ WY®h� � ©!X � ©!Xb� ¬ ¨ªTRVÔT�Xb�T�­!WD[FW � WYZ'[ �Y� WYXF[ � WH[FW ¬ T ¬ ZF\Ø]�XF© � ]_� � c Wj��W ¬�¬ W � ©!Xb�ÄZFX'«á©!X � T �F� © � �� ]_­!XsT ¬B� Z � « � ZF]���[FW¹Ú ©!XF[ Ö?G ¬ Wji4] � �W � ] i � ZsT ¬ ]_� �h�5{ ©!Z1[ � AFXF]_��]�©!X � }Õ[�¨ �h¬ Wh®h� � ©!X � c8[�W ¬ T�F¬ Z ��¬ ��®�Þ�W k ¬ T �F¬ Z ��� W ����� W�W ¬�¬ W ��� ©!Xb�?XF©!\Ø\ � W � | O : ©=© � Wdc : ©=© � WKc NE: ©4© � W�Pdc NE: ©4© � WRa�cN WY[�]�ZF\ïWj� < ]_­!Þb� ÖÔ7 ÞsT � ZFW � ZFT ¬ ]�� �K� W � Z�]�W � ��[�W � ® � ]��ß � W � [F]Dn �Y� WYXb� �1� ZF]4[�©!]_V�WYXb�Í��©!Z � rh� � W� TÔ��] � ÚwT�]_� � Ö�7 W � ® � ]_�ß � W �2� ©!Xb� ���h� ZF\ �Y� [sTÔX �2¬ WB�T�« ¬ WYT�Z ó4Ö S { ó4Ö�� } � ©!Z �H¬ T � T � �]_WB®YWhX�� � T ¬ W{w¬ W � «�©�ZF®�ÞF©!X � }L[FZ^® T ¬ © � ]_\^ßj� � W Öb: T�\^T�ÒÓ© � ]_� � [�W � VÔT � ] T�« ¬ W �K¬ ] � � � W � ©!Xb� � � � [ � AsXF]�W � [sTÔX �¬ W �Ø� WY®j�]�©�X � S Ö S#Wh� ó4Ö S ÖD: W � VÔT � ]�T�« ¬ W � < � ä N ô ô kKõ?Wh� m ]_� ã d ©!T�[ ô ô Pfõ � ©!Xb�ØZ��] ¬ ] ��� W � WYXT ��� ©4®h] TÔ��]�©!X [sT�X �8¬ T � T � �]_Wo®YWhX�� � T ¬ Wo[FZ�® T ¬ © � ]_\^ßj� � WKc�W ¬�¬ W � ©!Xb�8[ � AFXF]�W � ®h] ã [FW �Ó� ©!Z � |

• ¬ T < � ä N W � � ¬ T ��� ©!«sTÔ«F] ¬ ]_� � ��� TÔ��] T ¬ W � ZFW ¬ T � � T�®YW � ©�]_�ØT �Ó� ©=®Y] � W k ZFX ® TÔXF[F]�[FTÔ��h¬ WY®j� � ©!\ TÔ­!X � ��] � ZFWKc�V!©!] � As­ Öáó4Ö ó csW ¬�¬ WBW � �;[ � AsXF]_W kØ� T � �] � [FW |

χ2 =

(

∆ηdet

σηdet

)2

+

(

∆φ

σφ

)2

, { ó4Ö ad}

∆ηdetWj�

∆φ � ©!Xb� � W �Ó� Wh®h�]�V!Wh\^WhX�� ¬ W � [�]Dn �Y� WhXF®YW � [FW � © � ]��]�©�X�WYX ηdetWh�fWhX

φWYXb� � W

¬ T8� � T�®YWLWh� ¬ ¨ ©!«=ÒÓWh� �Y¬ WY®j� � ©�\ T�­�X � ��] � ZFWdc σηdet

Wj�σφ� ©�X�� ¬ W ��� ®YT � � � � ` � W �Ä� W ��� WY®j�]�Ú � �

• ¬ T�V�T � ] TÔ« ¬ W m ]�� ã d ©bT�[ W � �?Z�X ¬ ]�äÔW ¬ ]_ÞF©=©4[ � ZF] Z��] ¬ ] � W ¬ W � ®h©!Z �F�2¬ T�] �Ó���h��¬ W ¬ ©!XF­'[�W ¬ T� � T�ÒÓWh®h�©�] � WU[�W �o� T � �]_®YZ ¬ W � [sTÔX �o¬ W�� � T�ÒÓWh®h��©!­ � T � ÞFWdc~Wh� ¬ ¨ � X�W � ­�]�W�� � T�X � V!W ��� W [FW ¬ T� T � �]_®YZ ¬ Wdc � ©!Z � \^]_WYZ4iE]�[FWhXb�]DAFW �B¬ W �o�Y¬ WY®j� � ©�X � c ¬ W �o� Þ�©��©!X � Wh� ¬ WU« � ZF]��o[FW'Ú ©!XF[ ÖA X Wfn~Wj�qc ¬ W �K� ÞF©���©!X � XFW ¬ TÔ] ��� WYXb� � T � [FW?� � T�®YW?[sTÔX �K¬ W�� � T�ÒÓWY®j�©!­ � T � Þ�WdcbWh� ¬ To� � T�®hW¬ T�] �Ó��� W � T �U¬ W �'�Y¬ WY®j� � ©�X � W � � [F]Dn �Y� WYXb�W3[FW3®hW ¬_¬ W ¬ T�] �Ó��� W � T �'¬ W � « � ZF]_� � [FWÕÚ ©!XF[ ÖA X]AsXic ¬ T3VÔT � ]�T�« ¬ W m ]_� ã d ©bT�[!c�®h©!\ �F� ] � WØWYXb� � WÕkMWj�ÕP^c � W � TM[�¨ TÔZ���T�Xb� �F¬ Z ���Y¬ WhV � W� ZFW ¬ ¨ ©!«=ÒÓWj� � W �Ó� Wh\'« ¬ W � T k ZFX �h¬ Wh®h� � ©!X!cFV�©!] � As­ Ö�ó4Ö Qä�

• ¬ T VÔT � ] T�« ¬ W C ]_­ Ý ÞF] ®Y© �Ó� W ��� ©!XF[ k ¬ T ¬ T � ­!WhZ � WYXM®Y\À[FW ¬ ¨ª©!«�ÒÓWh� �Y¬ WY®h� � ©!\^T�­!X � �] � ZFW[sTÔX �'¬ T+� � ©!] � ]�ßY\ØWØ®Y©!ZF®�Þ�WÕ[FZ ® T ¬ © � ]�\Øßh� � W { ADN S�}@c�[sT�X ��¬ W �F¬ TÔX (r, φ)c V!©�] � AF­ Öó4Ö ô4Ö

A X ­ � X �Y� T ¬ c ¬ W � [ � AsXF]��]_©!X �D� ©!Xb��®h©!X � � � Z�]_�W � [FW8ÚwT"�Y©�X [FW �F¬ Z � WYX �F¬ Z �D� � � ]_®h�W8WYX � W �Ó� W �Ûã� T�Xb� ¬ W � ®h©!Z � Z � W � [ � Ò k Wji4] � ��T�Xb��W � cs©�Z3WYX+T�ÒÓ©!Z4��T�Xb�?[FWBX�©!Z�V!W ¬�¬ W � ®Y©�Z � Z � W �2� Z � [�¨ TÔZ�� � W �

ô Q

Page 78: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

ODT � ]�T�« ¬ W � O : ©4© � W : ©=© � W NE: ©4© � W�P NE: ©4© � WRa N WY[F]_ZF\ < ]�­!Þb�G � © � k Ö PRk k Ö PRk k Ö k ô k Ö k ô k Ö k ô k Ö k ô

ADN Ú � � k Ö l ó k Ö l ó k Ö l ô k Ö l ô k Ö l ô k Ö l ôG � © mB7û� � S Ö ó S Ö k a Ö ó a Ö ó a Ö ó a Ö ó

m ã N T0� � ] i ô � S ó S ó a ó a ó a ó a óJ;J ã W ¬ WY® ô � ! k Ö a k Ö a k Ö Q k Ö Q k Ö Q:�m ©=©4[Fc � ! ! ! ! k Ö a k Ö c< � ä N � ! k Ö k!k�P k Ö k!k�P k Ö k!k�P k Ö k!k�P k Ö k!k4P

©!Z m ]�� ã d ©bTÔ[ � ! k Ö�� k Ö�� k Ö ó k Ö ó k Ö ó��� ��~ó4Ö S�� @ � AsX�]_�]_©!X � [FW �e�h¬ Wh®h� � ©!X � [sT�X �8¬ T ��� ­!]�©!X+®hWYXb� � T ¬ Wo[FZ�® T ¬ © � ]�\Øßh� � W Ö

ODT � ]�T�« ¬ W � O : ©=© � W : ©=© � W NE: ©=© � WÔP NE: ©=© � W a N WY[�]�ZF\ < ]�­�Þ��G � © � k Ö PRk k Ö P k k Ö PRk k Ö k ô k Ö k ó k Ö k ô

ADN Ú � � k Ö l ó k Ö l ó k Ö l ó k Ö l ó k Ö l ô k Ö l ôG � © mB7û� � S Ö ó a Ö k a Ö k a Ö k P Ö k a Ö k

m ã N TÔ� � ]�i�c � S ó a�k P ó P ó PRk P óJeJ ã W ¬ Wh® S � ! k Ö�� k Ö�� k Ö�� k Ö�� k Ö��< � ä N � ! ! ! ! ! k Ö kC ]�­ Ý Þ�] � ! ! aÔk Ö k a�k Ö k a�k Ö k a�k Ö k

��� ��ó4Ö�� � @ � AsXF]_��]�©!X � [�W �?�Y¬ WY®h� � ©!X � [FT�X �?¬ W � «�©!Z�®�ÞF©!X � [FZ�® T ¬ © � ]_\^ßj� � W ÖV�T � ] TÔ« ¬ W � Ö�G ¬ X�¨ `�T � T � [FW VÔT � ]�TÔ�]_©!X¹� � © � « � Z��T ¬ W WYXb� � W ¬ W � W C ® TÔ®Y]_� �Y� [FW � [ � AFXF]_��]�©!X �T�[0Ò�T�®hWYXb�W � c~W ¬�¬ W�W � �;­ � X �h� T ¬ WY\ØWYXb�e®Y©!\ �F� ] � WWYXb� � W � Wh� ô��ÕÖ~C WYZ ¬ W �;¬ W � [ � AsX�]_�]_©!X � N W ã[F]�ZF\ Wh� < ]�­�Þ��?[FT�X �?¬ W � «á©!ZF®�Þ�©!X � [FZ�® T ¬ © � ]_\^ßj� � We©!Xb�8ZFXFWoVÔT � ]�TÔ�]_©!X �F¬ Z � ]�\ � © � ��T�Xb��Wdc® T �?¬ ¨ W C ®YT�®Y]�� � [FZ � ]�­!XFT ¬ «sT�] ��� W �F¬ Z � Ú © � ��WY\ØWYXb�qcsWhX�� � WØP ó Wh�;S!k � c k ®YT�Z � W�[FW ¬ T'ÚwT�]_« ¬ WW C ® T�®h]_� � [FW � WY®Y©�X � � � ZF®j�]�©�X3[FW � � � T�®hW � [FT�X � ®hWh����W ��� ­!]�©!X Ö4A X3­ � X �Y� T ¬~¬ W � TÔXsT ¬ ` � W ���F� ] ãV4] ¬�� ­!]�WhX��eZFXFW ¬ ¨ªW C ® T�®h]_� � T�Z ��� ] �Y¬ WhV � W � ZFW � © ��� ]_« ¬ WKc � T � ®Y©�X ���~� Z�WYXb�qc � WhZ ¬ W ¬ T ®h©!Z � Z � W< ]�­!Þb�qc ¬ T �F¬ Z � �Ó� V!ß � WKcH[FWh\ T�X�[FWMZ�XFW�� � T�®hWET ��� ©=®Y] � W�T�Z,® T�XF[�]�[sTÔ� �h¬ Wh®h� � ©!\^T�­!X � �] � ZFW{ < � ä N � k Ö k^}H[sT�X �?¬ W � «�©�ZF®�ÞF©!X � [FZ�® T ¬ © � ]_\^ßj� � W Ö

�h÷"�·÷�� �$# �iüN�@�±� L ���&%����Q���â���('P�*ü:�t�.�s�: TmAs­!Z � W ó4Ö c�\Ø©!Xb� � W8[FW � Wji4Wh\ �F¬ W � [�W;[F] � � � ]�«FZ4�]�©�X � [FW � W C ® T�®h]_� �Y� [�¨ ]�[�WYXb�]BAs® TÔ��]�©!X[FW ��Y¬ WY®j� � ©�X � WYX#Ú ©!XF®j�]�©�X¹[FW ¬ WhZ � ]�\ � Z ¬_� ]�©�X � � � T�X � V!W ��� W ���

Tc~Wh�[FW � TÔXF­ ¬ W � ηdet

Wj�φ� ©!Z � [F]Dn �Y� WYXb�W � [ � AsXF]��]�©�X � Wh�8[sTÔX �?¬ W � [F]Bn �h� WhX���W �?� T � �]_W � [FZ�® T ¬ © � ]_\^ßj� � W Ö

�h÷"�·÷6� �Z�Jý]ý]�5����.�s�������ÿ� # �*üN�i�y� L �A X�­ � X �h� T ¬ c ¬ T � ]�\�Z ¬ TÔ��]�©!X X�W � W �F� ©=[FZF]�� � T �Ø� T � ÚwTÔ]_�Wh\^WhXb� ¬ T �Ó� T ¬ ]_� � cfWh�^[F©!X�® ¬ T[F] � � � ]_«FZ���]�©!XM[FW �� V�ßYXFWh\^WhXb� ��� ]�\�Z ¬��h� W � � ¬�� ­�ß � Wh\^WhXb�[F]Dn �Y� WYXb�WU[FWU®hW ¬_¬ W'[FW � [F©!XFX � W � Ö

Ý ©!Z �#� ZFW ¬ T � ]_\'Z ¬ T0�]�©�XÑ[ � ® � ]�V!WMT�Z,\Ø]�WhZ4i ¬ T �Ó� T ¬ ]_� � c�©�X,®h© ��� ]�­!W ¬ T � ]�\'Z ¬ TÔ�]_©!X T V!Wh®ô!ô

Page 79: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

[FW � ÚwT�®j�WYZ ��� [FW�®h© ��� WY®j�]�©�X { XF©�� � SF � ©�Z � C ® T ¬ W 5 T�®j�© � } Ös: W SFW � � ¬ W � T �F� © � �8WhX�� � W

¬ ¨ W C ® TÔ®Y]_� � [FW � [F©�XFX � W � Wj�8®YW ¬_¬ Wo[FW ¬ T � ]�\�Z ¬ TÔ��]�©!X [sT�X � ®�ÞsT � ZFW�«F]_X�]��W ¬�� ZFW |

SFi = εDatai /εMC

i . { ó4Ö S^}SFi

W � �Ä® T ¬ ®YZ ¬��K� ©�Z � ®�ÞsT � ZFWH[ � AsXF]��]_©!X�WhX�Ú ©!X�®h�]_©!X�[FW pEMT

cηdet

c�Wh�φdet

c�[sT�X �g¬ W � 727 Wj�AD7 [FZ�®YT ¬ © � ]�\Øßh� � W Ö G ¬ �]�WhXb��®h©!\ � �WK[FW � ]�XF®hW � �]_��ZF[FW �Í� ��TÔ��] � ��] � ZFW � Wj� � ` � � � \ TÔ��] � ZFW ��¬ ] � W �T�Z4i^[F©!X�X � W � Wh� k�¬ T � ]�\�Z ¬ TÔ��]�©!X Öb: T As­!Z � W ó4Ö l�\Ø©!Xb� � W;[FWhZ4i Wji4WY\ �F¬ W � [FW;[F] � � � ]_«FZ���]�©!X �[FW � ÚwT�®h��WYZ �Ó� [FWe®Y© �Ó� Wh®h�]_©!X ©�«��WhX=Z � WYX Ú ©�XF®h��]�©!XØ[FW ¬ ¨ª]_\ � Z ¬�� ]�©!X'� � T�X � V!W ��� W �Tc � ©!Z �D¬ W �[FWYZ=i+[ � AFXF]_��]�©!X � O : ©4© � WWh� < ]�­!Þb�?[sTÔX �?¬ W � 727 Wh� AD7 [FZ�® T ¬ © � ]_\^ßj� � W Ö

æØÐ�) ¢è¸�º�±L¥Y¶+§ ½h¸�º: ¨ªT�ZF­�\^WhX��TÔ�]_©!X�[FW ¬ T ¬ Z�\^]_XF© � ]�� � WYXb� � W ¬ W d ZFX GÓG T Wh� ¬ W d ZFX G�G «�T X � ®hW �Ó� ]_� � [FWXF©!\'« � WYZ=i#®�ÞsT�XF­�WY\ØWYXb� � cgX�©���T�\Ø\ØWYXb� ¬ W � ® � ]��ß � W � [FW �Ó�Y¬ Wh®h��]�©!X#Wh��[�¨ ]�[�WYXb�]BAs® TÔ��]�©!X¹[�W �

�Y¬ WY®h� � ©!X � [sT�X �o¬ W'® T ¬ © � ]�\Øßh� � W�©�X��[t¶,rh� � W � WjV4Z � c ¬ ¨ WYX�ÒÓWYZ � �T�Xb�[FWU­bT � [FW � ZFX � T �F� © � �� ]_­!XsT ¬D� Z � « � ZF]��U[FWÕÚ ©!XF[ TÔZ ��� ] �Y¬ WjV �Y� ZFW � © ��� ]�« ¬ W Ö�@ T�X � ®hW3®�ÞsT � ]�� � WKc ¬ W � [F]Bn �h� WYXb��W �� �T � W � [FW ¬ T+®YW � �]BAs® TÔ��]�©!X�[FW ���Y¬ Wh®h� � ©!X � ©!Xb� � � � �����Y� WYXb� � W � | ¬ W � ®Y©!Z � Z � W � [�¨ ]�[FWhXb�]DA ã® TÔ��]�©!X#[FW ���h¬ WY®j� � ©!X ��� ©!Z ��¬ W d ZFX G�G «�©!Xb� � � � [ � AsX�]�W ��� ©!Z �¬ T � T � �]�W ®hWYXb� � T ¬ W Wh� ¬ W �«�©�ZF®�ÞF©!X � [FZ-®YT ¬ © � ]�\Øßh� � W:��[FW � ÚwT�®h��WYZ �Ó� [FW�®Y© �Ó� Wh®h�]_©!X-©�X�� � T �ج T � Z�]_�W � � � ®YT ¬ ®hZ ¬��h�� ©�Z � ®�ÞsT � ZFW�[ � AsX�]_�]_©!X!cFWj� � ©!Z � ®�ÞsT � ZFW �Ó� ­!]_©!X+[F©!XFX � W�[FZM®YT ¬ © � ]�\Øßh� � W Ös7 W � ®Y©�Z � Z � W �®YW � �]BA � W � ©!Xb� � W � V4] kU¬ ¨ªT�XsT ¬ ` � Wo[FW®hWh����Wo�ÞFß � W Ö

ô c

Page 80: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

{|~}w�Kó4Ö Pò� @ ] � � � ]_«FZ��]_©!X [�W � W C ®YT�®Y]�� �Y� [~¨ª]_[FWYXb�]BAs® T0�]�©�XÑ[FW �U�h¬ Wh®h� � ©!X �Í{ W C ®Y]_WYXF®j`]}UWhXÚ ©!XF®h��]�©!X[FW ¬ ¨ ]�\ � Z ¬_� ]_©!Xe� � T�X � V!W ��� W { pT} Ö0A X�ÞsT�Z4�qc ¬ T2®Y©�Z � Z � W < ]_­!Þb� ã � � ä { \Ø©�`�WYXFX�WY\ØWYXb�

� W �Ó��� W§}2[ � AsX�]�W � ©!Z �2¬ W � [F©!X�X � W � [FZ d Z�X GÓG T { � P ô } Ö�A X�«sT � c ¬ TU\<rh\^Wo®h©!Z � Z � W < ]�­!Þb� ã� � ä � Z �B¬ W � [F©�XFX � W � [FZ d ZFX G�G « { � a�k�} Öá: W �B� ©!]�Xb� �X{w� ©!ZF­!W � } � W �F�Ó�Y� WhXb�WYXb� ¬ W � [F©�XFX � W �Wh� ¬ W;� � T�]�� { « ¬ WYZ7} ¬ T � ]_\'Z ¬ T0�]�©�X Ö

ô l

Page 81: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

IsoHC41 2 3 4 5 6 7

IsoHC41 2 3 4 5 6 70

0.2

0.4

0.6

0.8

1 CC

Z->ee, MCZ->ee, Dataqcd fake, Datagamma+jet, MC

IsoHC4

{|~}w�~ó4Ö aI� @ ] � � � ]_«FZ���]�©!X3[FW ¬ T�V�T � ] TÔ« ¬ W G � © mB7û� [sT�X �8¬ Wo® T ¬ © � ]_\^ßj� � WB®YWhX�� � T ¬ Ö

lhood80 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1

lhood80 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 10

0.2

0.4

0.6

0.8

1 CC

Z->ee, MCZ->ee, Dataqcd fake, Datagamma+jet, MC

lhood8

{|~}w�áó4Ö S�� @ ] � � � ]�«�Z��]_©!X3[FW ¬ T'VÔT � ]�T�« ¬ W :�m ©=©4[Fc [FT�X �?¬ Wo®YT ¬ © � ]�\Øßh� � W;®hWYXb� � T ¬ Ö

NNout7_cc0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1

NNout7_cc0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 10

0.2

0.4

0.6

0.8

1 CC

Z->ee, MCZ->ee, Dataqcd fake, Datagamma+jet, MC

NNout7_cc

{|~}w�~ó4Ö�� � @ ] � � � ]_«FZ���]�©!X3[FW ¬ T�V�T � ] TÔ« ¬ W JeJ ã W ¬ Wh® ô [sT�X �8¬ Wo® T ¬ © � ]_\^ßj� � WB®YWhX�� � T ¬ Ö

c!k

Page 82: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

prbtrk0 0.002 0.004 0.006 0.008 0.01 0.012 0.014 0.016 0.018 0.02

prbtrk0 0.002 0.004 0.006 0.008 0.01 0.012 0.014 0.016 0.018 0.020

0.2

0.4

0.6

0.8

1 CC

Z->ee, MCZ->ee, Dataqcd fake, Datagamma+jet, MC

prbtrk

{|~}w��ó4Ö ó � @ ] � � � ]�«FZ4�]�©�X3[FW ¬ T�VÔT � ]�T�« ¬ W < � ä N [sT�X �8¬ Wo® T ¬ © � ]_\^ßj� � W;®YWhXb� � T ¬ Ö

emhits_e_f_discriminant0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1

emhits_e_f_discriminant0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 10

0.2

0.4

0.6

0.8

1 CC

Z->ee, MCZ->ee, Dataqcd fake, Datagamma+jet, MC

emhits_e_f_discriminant

{|~}w�áó4Ö Q�� @ ] � � � ]�«�Z��]_©!XÕ[FW ¬ T'VÔT � ] T�« ¬ W m ]�� ã d ©bTÔ[Õ[sT�X �?¬ Wo® T ¬ © � ]_\^ßj� � W;®YWYXb� � T ¬ Ö

sigphi0 2 4 6 8 10 12 14 16 18 20

sigphi0 2 4 6 8 10 12 14 16 18 200

0.2

0.4

0.6

0.8

1 CC

Z->ee, MCZ->ee, Dataqcd fake, Datagamma+jet, MC

sigphi

{|~}w��ó=Ö ô � @ ] � � � ]_«FZ���]�©!X3[FW ¬ T�V�T � ] TÔ« ¬ W C ]�­ Ý ÞF]�[FT�X �?¬ Wo®YT ¬ © � ]�\Øßh� � W;®hWYXb� � T ¬ Ö

c�P

Page 83: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

, GeV/cT

p10 20 30 40 50 60 70 80

overall_effEntries 18Mean 37.56RMS 14.5

, GeV/cT

p10 20 30 40 50 60 70 800

0.2

0.4

0.6

0.8

1

overall_effEntries 18Mean 37.56RMS 14.5

Vloose ECZ->ee, MCZ->ee, Dataqcd fake, Data

Efficiency vs. overall

î -kï@,T

ù�&¼2q27*1( Ñiô, GeV/c

Tp

10 20 30 40 50 60 70 80

overall_effEntries 18Mean 37.71RMS 14.56

, GeV/cT

p10 20 30 40 50 60 70 800

0.2

0.4

0.6

0.8

1

overall_effEntries 18Mean 37.71RMS 14.56

Loose CCZ->ee, MCZ->ee, Dataqcd fake, Data

Efficiency vs. overall

î aDïi,T

&)2727*1(Nô5ô

φ0 1 2 3 4 5 6

overall_effEntries 17Mean 3.141RMS 1.808

φ0 1 2 3 4 5 60

0.2

0.4

0.6

0.8

1

overall_effEntries 17Mean 3.141RMS 1.808

Mloose1 ECZ->ee, MCZ->ee, Dataqcd fake, Data

Efficiency vs. overall

î z+ïφñÔ&¼2q2k*6(+* Ñiô

η-3 -2 -1 0 1 2 3

overall_effEntries 30Mean -0.0003322RMS 0.6284

η-3 -2 -1 0 1 2 30

0.2

0.4

0.6

0.8

1

overall_effEntries 30Mean -0.0003322RMS 0.6284

Mloose2 CCZ->ee, MCZ->ee, Dataqcd fake, Data

Efficiency vs. overall

î _.ïηdet

ñÔ&)2q2k*6(:øgô5ô{|~}w�Kó4Ö c�� AJC ®YT�®Y]�� � [�¨ ]�[FWhXb�]DAF® TÔ��]�©!XÑ[�W �U�Y¬ WY®j� � ©�X � WYX Ú ©!XF®j�]_©!X [FW | ó=Ö c { T�} { ó4Ö c { «7}¼}¬ ¨ ]�\ � Z ¬_� ]�©�X � � T�X � V!W ��� W � ©!Z �'¬ T [ � AsX�]_�]_©!X O : ©=© � W { : ©4© � W§}�[FT�X � ¬ W AD7 { 727 }*�fWj� [FW¬ ¨ªT�XF­ ¬ W φ

ó4Ö c { ®q} { ηdet

ó4Ö c { [7}¼} � ©!Z �3¬ T [ � AsX�]_�]_©!X NE: ©4© � W�P { NM: ©=© � WRa^}Õ[sT�X �M¬ W AL7{ 727 } Ö

cba

Page 84: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

, GeV/cT

p15 20 25 30 35 40 45 50 55 60 65 70

Data

/MC

scal

e fa

ctor

0.86

0.88

0.9

0.92

0.94

0.96

0.98

1

1.02

1.04

Vloose CCData/MC scale factor

uncertainty σ 1 ±

î -kï-,?ö ù�&¼2q27*1(�ô5ô, GeV/c

Tp

15 20 25 30 35 40 45 50 55 60 65 70

Data

/MC

scal

e fa

ctor

0.7

0.75

0.8

0.85

0.9

0.95

1

Tight CCData/MC scale factor

uncertainty σ 1 ±

î a"ï-,?ö/.�bCB$õ70�ô5ô

, GeV/cT

p15 20 25 30 35 40 45 50 55 60 65 70

Data

/MC

scal

e fa

ctor

0.86

0.88

0.9

0.92

0.94

0.96

0.98

1

1.02

1.04

Vloose ECData/MC scale factor

uncertainty σ 1 ±

î z:ï-,?öÊù &¼2q2k*6(`Ñiô, GeV/c

Tp

15 20 25 30 35 40 45 50 55 60 65 70

Data

/MC

scal

e fa

ctor

0.5

0.55

0.6

0.65

0.7

0.75

0.8

0.85

0.9

Tight ECData/MC scale factor

uncertainty σ 1 ±

î _.ï0,?ö1.�b9Bkõk05Ñiô{|~}w� ó4Ö lÈ� d T �F� © � �e[FW � W C ® TÔ®Y]_� �Y� @ TÔ��To� N 7 { � � T�]�� ��¬ WY]_X7}fc�Wj� ¬ W � ]_XF®YW � �]��ZF[�W ��{ � ©�]�X ã�] ¬_¬��h� }fc�WYXMÚ ©�XF®h��]�©!X�[FZ � EM

T

c � ©!Z �e¬ W � [ � AFXF]_��]�©!X � ó4Ö l { T�}ûO : ©4© � W�Wh� ó4Ö l { «7} < ]�­�Þ��e[sT�X �¬ W 727 csWh� � ©!Z �2¬ W � [ � AFXF]_��]�©!X � ó=Ö l { ®§}âO : ©=© � W�Wj� ó4Ö l { [7} < ]_­!Þb�8[sT�X �?¬ W AD7;Ö

c!S

Page 85: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

� � æ �¾ðáî�ò�ê 2

� ê-òÕîMð@þî` æïîMð!u a ëÈê éhé!ð ëÈê�a îMð@þî` æïîMð!u a ëÈê-ì� é�ê�` î+ò0u a ì ë æ a ì éhé t � _

�Z�s�â�'���â�'�ß7�Ç� ��¡]�@¢~���!ÚÈ"�fÆD�]¡ �Q�£���£�£���£�Q���£�£���£�£�Q���£�£���£�£���Q�£���àÝ�ìß7�F �%�KÌ ��Ê¿Û��"�@Ì��@ gÚ*Ì �£���£�£���£�Q���£�£���£�£�Q���£�£���£�£���Q�£���àÝt§ß7�¨Ù ëâÈqÄ* g¡]�fÆÇ���Ç�'¡5�i�M�i�'¡i¡ÅK��Ì �£�Q���£�£���£�£�Q���£�£���£�£���Q�£���àÝ�ßß7� ì ��Åd�Ç��ȧ�fÆÇ�'¡Û�i��Ì�Å�Ü'�K¡*�KËv�K¡]�@ÌZ�Q���£�£���£�£�Q���£�£���£�£���Q�£���àÝ�ßß7�v§ �%�KÌ Å"Ü]�K¡*�KËv�K¡]�@Ì Ì~ÆÇË|Úi�ÇÅ�Ì3�£�Q���£�£���£�£�Q���£�£���£�£���Q�£���àÝ�Ýß7� ß ë�33È" �È�ÆD�@Å�Ì ���£�Q�£���£�£���£�Q���£�£���£�£�Q���£�£���£�£���Q�£���àÝ�Ý

�^¦ �^¦¨¥ �� ½@®q½�»¨².Óe¿^­�²±¯¼®�4±ª�½�².µqا¯¼®´�Ògª ¦e¦h¦·¦h¦·¦h¦·¦·¦h¦e¦h¦·¦h¦·¦·¦h¦ å§å�^¦ �^¦º¹ �� ½@®q½�»¨².Óe¿�ªä¯.ª�½�µq¶g«±²±¯±­g½�²±»Fµq¶2¿�ª�«sµqÔ54±ª�².«s²¼®­g« ¦e¦h¦·¦h¦·¦·¦h¦ å§å�^¦ �^¦ºÞ �� ½@®q½�»¨².Óe¿^­�¯.Ó�«.ª@®­<¿�ªä¶gª�­�¯.µq¶gª�«�²¼®­ ¦h¦·¦·¦h¦e¦h¦·¦h¦·¦·¦h¦ ¸§ê�^¦ �^¦ æ �� ½@®q½�»¨².Ó·².µq²¼®³Fª0¦h¦·¦·¦h¦·¦h¦·¦e¦h¦·¦h¦·¦h¦·¦·¦h¦e¦h¦·¦h¦·¦·¦h¦ ¸§¹

ß7�DÝ 6£¢ÚiÆD�£�i�MÉ&�'¡*�5Ë|Úi�B�fÆ Û��"�£���£�Q���£�£���£�£�Q���£�£���£�£���Q�£��� ¤]Âß7� Ý �� �ȧ�@�dÚ¢Ì �i�MÈ"�'¢~¢��È"�fÆD�]¡3���£�Q���£�£���£�£�Q���£�£���£�£���Q�£��� ¤]Âß7�¨¤ íe�'¡*È���ÚÌ~ÆD�]¡2���£�Q�£���£�£���£�Q���£�£���£�£�Q���£�£���£�£���Q�£��� ¤'Ù

7 WÕ®�ÞsT � ]�� � Wdcg®Y©!X � T�® �Ó�YkE¬ TM®YW � ��]DAs®YTÔ�]_©!X [FW ¬ ¨ ]�[FWhX���]DAs®YTÔ�]_©!X [FW �'�h¬ Wh®h� � ©!X � [FT�X ��¬ T��� ­!]�©!XM]�Xb�W �Ûã ® � `�© � �TÔ� { GÛ7�d }@c�W � �oZFX¹®Y©�\ �F¬_� \ØWYXb�B[�Z ����� ® � [FWhXb�®�ÞsT � ]�� � W Ö�: ¨ªT�ÒÓ©!Z��o[�W ��Y¬ WY®h� � ©!X �8� Wo� � ©�Z�VÔT�Xb�e[FT�X �8¬ T ��� ­!]�©�X�]_Xb�W �Iã ® � `!© � ��T0� � W � \^Wj�8WYX�\^©R`!WhXFXFW�[�¨ªT�ZF­!\ØWYXb�W �¬ ¨ W C ® TÔ®Y]_� � [FZ � ]_­!XsT ¬ [�W ��� ß � [FW#P ô"�3ÖÄJ ©!Z � V�W ��� ©!X � [sT�X � ¬ W �U�F� ©4®�ÞsTÔ]�XFW �U� T�­!W � c ¬ W �[F]Dn �Y� WYXb�W �f� �T � W � [FW ¬ Te®YW � �]BAs® TÔ��]�©!X�[FW ¬ ¨ ]�[FWhXb�]DAF® TÔ��]�©!X�[FW �f�h¬ WY®j� � ©!X � [sT�X � ®YWh�Ó�W �Ó� ­!]_©!X[FZ+[ � ��WY®j�WYZ � Ö

ç Ð ð �áºU� ³�¸Ø´+¶+±L��½h¸�º: W3[ � �Wh®h��WYZ � @�� T ZFX «�©!X ®YT ¬ © � ]�\Øßh� � W^[F©�� � [�¨ªZ�XFW+Wji4®YW ¬�¬ WhXb�W3ÞFW � \ � �]_®Y]�� � [sTÔX �

� T � T � ��]�W ®YWhXb� � T ¬ W { 727 }�Wj� � W � «á©!ZF®�Þ�©!X �Y{ AD7 } ÖÍ7 W � WYXF[FT�Xb�qc ¬ T �Ó� ­!]_©!X ]�Xb�W �Ûã ® � `�© � �TÔ�{ GÛ7�d };[FZ [ � ��WY®h��WYZ � [ � AsXF]�W � T � 1.1 ≤ |ηdet| ≤ 1.5

c k�¬ ¨ªW�i4®YW � �]�©�X [�W � «�© � [ �M{ ®Ô¨ªW � � ã.k0ã[F] � W ¬ T �Ó� ­!]_©!X 1.1 ≤ |ηdet| ≤ 1.2Wh�

1.4 ≤ |ηdet| ≤ 1.5}@cÄX�¨ W � � � T � ®h©!Z�V!W � ��W � T � ¬ W® T ¬ © � ]_\^ßj� � W �Y¬ Wh®h� � ©!\^T�­!X � �] � Z�W�Wj�BW � �B� � ß �B� WYZE]�X � � � Z�\^WhX�� � W Ö�7 W �B¬ T�®hZFXFW � WYXb� � TD! X�WYXb�

c �

Page 86: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

ZFXFW;[ � ­ � T�[sTÔ��]�©!XØ[FW ¬ T�\ØW � Z � We[FW ¬ ¨ � XFW � ­!]�W?[sT�X ��¬ ¨ GÛ7�d c�®jÚ Ö a Ö a Ö S Ö S Ö=: W;[ � �WY®j�WhZ � ]�Xb��W �Ûã® � `�© � �TÔ� { GÛ7�@ } � W � \ØWh�L[FWe®h©!\'« ¬ W �K¬ ¨ªT�« � WYXF®hW;[FW � ®h©!ZF®�ÞFW �H�Y¬ WY®j� � ©�\ T�­�X � ��] � ZFW � Wh�L[F©!X�®[FW ¬ ]�\Ø]_��W � ®hWh����W^[ � ­ � T�[sTÔ��]�©!X Ö�: WØ«FZ���[FW ®hWh�Ó�WÕTÔXsT ¬ ` � WØW � ��[FW^[ � �W � \Ø]�XFW ��¬ ¨ªW C ® T�®h]_� �[FW � Wh®Y©!X � � � ZF®h��]�©!X�[FW �3�Y¬ WY®h� � ©!X � [sT�X �3¬ ¨ GÛ7�d cLT�]�X � ] � ZFW ¬ W � ÚwT�®j�WhZ ��� [FWE®Y© �Ó� WY®j�]_©!X � Ö: ¨ ©!«=ÒÓWh®h��]_Ú � ��TÔX���[�¨ ]�X�® ¬ Z � W ¬ W ��Y¬ Wh®h� � ©!X � [FW ¬ ¨ GÛ7�d [FT�X �¬ W � TÔXsT ¬ ` � W � c � ©!Z � TÔZF­!\ØWYXb�W �¬ T � ��T0�] � �] � Z�W Ö=7 W �H���Y� Z ¬ �TÔ� �D� W � ©!Xb�HZ��] ¬ ] �Ó�Y�f� T �L¬ T � ZF]_��W � ©!Z �D¬ T � Wh®�ÞFW � ®�ÞFWB[FZ m ]�­!­ � [�W®YWh�Ó�Wo�Þ�ß � W Ö

ç Ð:G ñ �?§ ¸�·�á����g§ �g£�¶+§7 ©�\^\ØWM\ØWYXb��]�©!XFX �E�F�Ó� ® � [FWY\Ø\ØWYXb�qc ¬ T �Ó� ­!]_©!X-]_Xb�W �Iã ® � `!© � ��T0�ÕX�¨ W � � �F� T0�] � ZFWh\^WhXb�

� T � ®h©!Z�V!W � ��W � T �'¬ W ® T ¬ © � ]_\^ßj� � W �Y¬ WY®j� � ©�\ T�­�X � ��] � ZFWdcÍ\ TÔ] � W ¬�¬ W ¬ ¨ W � �UWYXb��]�ß � WY\ØWYXb� � T �¬ W� � TRÒÓWY®h��©!­ � T � ÞFW { ®jÚ Ö a Ö a Ö S Ö P§} Öá: © �Ó� [FW ¬ WYZ �e� T ��� TÔ­!W�[sTÔX �;¬ ¨ GÛ7�d c ¬ W �8�Y¬ WY®j� � ©�X � XFW�[ ��ã� © � WYXb�o[F©�XF® � ZsT � ]�\ØWYXb� � T � [�¨ � XFW � ­!]�W�[sT�X �;¬ W�®YT ¬ © � ]�\Øßh� � W �Y¬ WY®h� � ©!\^T�­!X � �] � ZFWdc�®YW � ZF]®Y©!\ �F¬ ] � ZFW ¬ WYZ � ]_[FWYXb��]DAs®YTÔ�]_©!X � T �8¬ W � \ � �Þ�©4[FW � ÞFT�«F]_��ZFW ¬_¬ W � cs«sT �Ó� W �B� Z �8¬ ¨ � X�W � ­�]�W ¬ T�] �Ûã��� W+[sTÔX �U¬ WÕ®YT ¬ © � ]�\Øßh� � W �Y¬ Wh®h� � ©!\^T�­!X � �] � Z�W ÖÄA X � WjVÔT�XF®�ÞFWKc ¬ W �U�h¬ Wh®h� � ©!X �U¬ T�] �Ó� WYXb� ZFX�W� � TÔ®YWB[sTÔX ��¬ W8� � T�ÒÓWY®j�©!­ � T � ÞFWKcFWh��[ �Y� © � WhXb�?ZFXFW � T � �]_W;[FW ¬ WYZ �L� XFW � ­!]_WB[sT�X ��¬ ¨ GÛ7�@�Ös7 W �]�X�Ú © � \ T0�]�©�X �B� WYZ�V�WYXb�U[F©!X�®2rh� � W^Z��] ¬ ] �Ó� W ��� ©!Z ��¬ T � Wh®Y©!X � � � ZF®h��]�©!X�[FW ���Y¬ WY®h� � ©!X � [sT�X �®YWh�Ó�W �Ó� ­!]_©!XE[�Z¹[ � ��WY®h��WYZ � Ö : W � ©�«=ÒÓWh� � ��T�Z �e�F���h� WhX���WYXb��[FW'XF©�\'« � WhZ � W �o� W ��� Wh\'« ¬ T�XF®YW �TRV�WY® ¬ W � ©!«=ÒÓWj� �o�Y¬ WY®j� � ©�\ T�­�X � ��] � ZFW � [FT�X �o¬ ¨ GÛ7�d c k3� T V!©�] ��� Z�¨ ] ¬��;¬ T�] ��� WhXb�oZFXFW { ©�Z �F¬ Z ã� ]�WhZ ��� }K� � T�®hW {w� }L[sT�X ��¬ W8� � TRÒÓWY®h��©!­ � T � ÞFWeWh� � WYZ�V�WYXb� { ©�Z �F� T0�] � ZFWh\^WhXb� � T � }L[ �h� © � W � [�W¬ ¨ � XFW � ­!]_W�[sTÔX �;¬ ¨ GÛ7�@�Ö~: ¨ª]_[ � W�W � �o[F©!XF®�[�¨ªT�[sT � ��W �B¬ W � ®Y©!Z � Z � W � [FW �Ó�Y¬ WY®h��]�©!XE[FW � ©!«=ÒÓWh� ���T�Z � cf[ � Ò k W�i�] � �T�Xb�W � cDT�Z4i ©!«�ÒÓWh� � �h¬ WY®j� � ©!\ TÔ­!X � ��] � ZFW � ÖÄG ¬ ®h©!XbV4]_WYXb�Ø[sT�X � ZFX �F� WY\Ø]�W ��WY\ �F� [FW�[ � AsXF] �2¬ W � ©!«�ÒÓWh� � ��TÔZ Ö: W � ©�«=ÒÓWh� � �T�Z � ô ô a§õ � ©!Xb� ¬ W � ¬ W � ��©!X � ® T�X�[F]�[sT0� � ��T�Z �={ τ }fcK] ¬�� ©!Xb�ØZFXFW�[FZ �Ó� WE[�W+V=]_W� � ß � ®h©!Z � ��W [FW ¬ ¨ © � [ � W^[�W3a�l!k Ö PRk −15 � cgWh� � WÕ[ �Y� ]_Xb�ßY­ � WYXb�U[�©!XF®^� � ß � V=]_��W [sT�X ��¬ WØ[ ��ã�WY®j�WhZ � WhX ¬ T�] ��� TÔX��LZFXFWe©!Z �F¬ Z � ]_WYZ �Ó� � � T�®hW � [FT�X �H¬ W8� � T�ÒÓWh®h��©!­ � T � ÞFWdc=Wh� � V�WYXb�ZFW ¬�¬ WY\ØWYXb�ZFX [ �h�*S �B[�¨ � XFW � ­!]�W�[sT�X �;¬ W�®YT ¬ © � ]�\Øßh� � W Ö�@ T�X �B¬ ¨ GÛ7�d cá©!X � WYZ��B� � ©!Z4V!W � � � ©�] � � ` � W � [�W��T�Z � cs®hÚ Ö AF­ Ö Q Ö P |

� ¬ W��T�Z [FW2� ` � WP � W8[ �Y� ]�Xb�ßh­ � W?WYXØZFX π± Ö!G ¬ X�W ¬ T�] �Ó� W � T � [�¨ � XFW � ­!]�W?[sTÔX �K¬ W2® T ¬ © � ] ã\^ßj� � W �Y¬ WY®h� � ©!\^T�­!X � �] � ZFWdcÔ\ T�] ��¬ T�] �Ó� W�ZFX�W�� � TÔ®YW2[sT�X �f¬ WH� � T�ÒÓWh®h�©�­ � T � ÞFW Ö�7 W�� ` � W[FWH�T�Z � W � �f� � ©!Z�V � [sT�X �Ĭ WH®hWYXb� � W8[�W ¬ ¨ GÛ7�d c ¬�k ©^z ¬ W � ®Y©!Z�®�ÞFW �K�Y¬ WY®j� � ©�\ T�­�X � ��] � ZFW �� ©!Xb�8]�X�Wji4] � ��T�Xb�W � �� ¬ W'�T�Z#[FWØ� ` � W^a � WØ[ �Y� ]_Xb�ßY­ � WØWYX ZFX π± T V!Wh®^Z�X�©!Z �F¬ Z � ]_WYZ �Ó� π0 Ö G ¬f¬ T�] ��� WUZFX[ �Y�S �Ø[�¨ � XFW � ­!]_W+[sT�X �ج W+® T ¬ © � ]�\Øßh� � W �Y¬ WY®j� � ©�\ T�­�X � ��] � ZFWdc�Wh�^ZFXFW+� � TÔ®YW+[sT�X �ج W� � T�ÒÓWY®j�©!­ � T � ÞFW ÖF7 We� ` � WB[FWe��T�Z � W � ��� � ©!Z�V � T�ZÕ«á© � [Õ[�W ¬ ¨ GÛ7�d c ¬Çk ©^z ¬ W � ®Y©!ZF®�Þ�W ��Y¬ WY®h� � ©!\^T�­!X � �] � ZFW �2� ©!Xb� ¬ ]�\Ø]_� � W � �� ¬ WE�T�Z�[FW¹� ` � W S � W#[ �h� ]�Xb��ßY­ � W WhX �F¬ Z � ]�WhZ ��� π± T V!Wh®�Z�X1©�Z ��¬ Z � ]�WYZ ��� π0 Ö�G ¬� WhZ��e©!Z � T �e¬ T�] �Ó� W � Z�XE[ �h�*S �e[�¨ � XFW � ­!]_W�[FT�X �8¬ W® T ¬ © � ]_\^ßj� � W �Y¬ WY®h� � ©!\^T�­!X � �] � ZFWdc� W ¬ ©!X � Z�¨ ] ¬�� Wo� � ©!Z�V!W � W �Ó� Wh®h�]�V!Wh\^WhX��eT�Z3«á© � [3©!Z�T�Z3®YWhX�� � W[FW ¬ ¨ GÛ7�d c�Wj�?] ¬á¬ T�] ��� W�F¬ Z � ]�WhZ ��� � � T�®hW � [sT�X �8¬ WB� � T�ÒÓWY®j�©!­ � T � ÞFW Ö

: W � ® TÔXF[F]�[FTÔ� � ��T�Z ��� ©!Xb� � WY®h©!X � � � ZF]�� ��kM� T � ��] � [FWÕ[FWhZ4iÑT ¬ ­!© � ]_��ÞF\ØW � ô ô S�õ&c ¬ W �F� WY\Ø]�W �]�[FWhX���]DAsW ¬ W � T�\ T � [FZ ®YT ¬ © � ]�\Øßh� � W k+¬ ¨ªT�]�[FWU[�W ¬ ¨ T ¬ ­!© � ]_�Þ�\^W�[FW ® S XFW � ]�\ �F¬ Wdc { ®hÚ Ö S Ö S^}fcWh� ¬ W3[�WYZ4i4]�ßh\^W3Z4�] ¬ ] � W ¬ W � � � TÔ®YW � [FW3ÞFT�Z��W � ]_\ � Z ¬�� ]�©!X � � � T�X � V�W �Ó� W �Ø� ©!Z � Ú © � \^W �'¬ W �c ó

Page 87: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

{|~}w� Q Ö PÎ� 7 T � TÔ®h� �h� ] � �] � ZFW � [FW � � � ©!] � � ` � W � [�WB��T�Z | ¬ W;�T�ZÕ[FWB� ` � WUP � Wo[ �h� ]�Xb��ßY­ � WoWYXτ → π±ντ

c=] ¬ T�[F©!XF®8ZFXFW8� � T�®YW;T ��� ©4®h] � W8Wh�L] ¬ XFW8[ �h� © � W � T � [�¨ � XFW � ­!]_We[FT�X �H¬ W � ®Y©!Z�®�ÞFW ��Y¬ WY®h� � ©!\^T�­!X � �] � ZFW � [FZ ® T ¬ © � ]_\^ßj� � W { ADN WYX � ©!ZF­!Wq}*� ¬ W ��T�Z [�WÕ� ` � W�a � W3[ �Y� ]_Xb�ßY­ � WWYX

τ → π± Xπ0ντ

©^z#X�]_XF[F] � ZFW ¬ W'XF©!\�« � W [FW π0 c~®YWU� ` � WØ[FWU��T�Z � © ��� ßY[FWØ[F©!X�®UZFXFW� � T�®YW+Wh�Ø[ �h� © � W�[FW ¬ ¨ � XFW � ­!]_W3[sT�X � ¬ W � ®Y©!ZF®�Þ�W � ADN � ¬ WÕ�T�Z [FW3� ` � WMS � W�[ �Y� ]_Xb�ßY­ � WWYXτ → π±π∓π±ντ

Xπ0 T V�WY®ÕX ≥ k'cg] ¬f� © ��� ßh[FWÕ[F©�XF® TÔZ \Ø©!]�X � [FWhZ4i � � T�®YW � Wh� ¬ TÔ] ��� W

� V�WYXb�ZFW ¬�¬ WY\ØWYXb�8ZFXM[ �Y�S �?[�¨ � XFW � ­!]_W�[FT�X �?¬ W � ®h©!ZF®�ÞFW � ADN�Ö

® T�X�[F]�[sT0� � �T�Z � Ö Ý ZF] �B¬ W � ��T�Z �o� ©!Xb� ���h¬ Wh®h�]_©!XFX �h�mk � T � �] � [FW � ® T�XF[�]�[sTÔ� � ��TÔZ � c kÕ¬ ¨ªT�]�[FW[FW®Y©!Z � Z � W � [FW �Ó�Y¬ WY®h��]�©!X�T ���F� © ��� ] � W � Ö

ç Ð�� ó1±f²+£�ºU��½j¥h¥j¸�º ´3�¼´3¸�º+º3É2�?§: ¨ � ��ZF[FW � © � �W � Z �?¬ W � [�©!XFX � W � [FZ d ZFX G�G T WYX � WY­!] � � ��� W � WYXb� � W�T V � ] ¬ a�k!kba�Wj�8Ú � V � ]�W �a�k!k!Q'cDWj� � WY®Y©�X � � � ZF]��W � T V!WY® ¬ W ��� ©!­ � T�\Ø\^W+[FW � WY®h©!X � � � Z�®h�]_©!X*[FW @�� { [sk � WY®h©g} ÖL: W �[F©!XFX � W � ©!Xb� � � ���Ó�Y¬ WY®h��]�©!X�X � W ��k � T � �] � [FZ � ä�]�\ ADN ]_XF® ¬ Z � ]�V!WKcsWh�8W ¬_¬ W �2� ©!Xb� �F���h� WYXb� � W �

� ©!Z �e¬ T�Ú © � \ØW[FW�As®�ÞF]�W ��� 7H6B5 ã � � WYW �l{ ®jÚ Ö a Ö a Ö ó } Ö�: W � ä�]�\ ADN ]_XF® ¬ Z � ]�V!WZ��] ¬ ] ��� W � � ��� Ú ��ã� WhXF® ��� T � > 72CFà7�e7H6;5��8ALN ]�XF® ¬ Z � ]_V!W � Ý 6oC�C S � � PRc Ö P �FÖ k!k�?D[FT�X �Ĭ T;«sT � W�[FW�[F©�XFX � W Ö!: T¬ ZF\Ø]�X�© � ]�� � ]�Xb� � ­ ��� WUT �Ó� ©=®Y] � Wdc�ZFXFW'Ú ©!] �Q� ZFW ¬ W�� � ]�­!­!W � R�<8� P�a óÔ<2< { ®YW�� � ]_­!­!W �e� W � Z�]�W � �T�Z¹\Ø©!]�X � ZFX ÒÓWh�[�¨ � XFW � ­!]_W'� � T�X � V�W �Ó� W � Z �á�Y� ]�WYZ � W k P�a ó3à WyOm}BT � � � [FWY\^T�XF[ � c�W � ��[FWP Ö k ôK� ± k Ö k!Q!Q'Ú « −1 Ö�: ¨ªT�XsT ¬ ` � WT � � � Wfn~Wh®h�Z � W�[sT�X �?¬ Wo®YT�[ � W�[�W� � T VÔT�] ¬ [FW 7H6B5 W Ö

ç Ð�� óØÉ2¥j�?±L��½j¸�º ´3�?§ É�Ç�Â?º3�?Á �?º �g§: T3\ � ��ÞF©4[�WH> < T�­�T�XF[ Ýf� ©!«áWf?UT � � � Z���] ¬ ] ��� W � ©�Z � [ � ��W � \^]_XFW �o¬ W � W C ®YT�®Y]�� �Y� c V!©!] �

� Wh®h�]_©!X ó4Ö P Ö�n X ���h¬ Wh®h�]_©!XFXFW2[�©!XF® ¬ W �f� V�ßYXFWh\^WhX�� � T `!T�Xb�DT�Z \^©!]_X � Z�X �h¬ Wh®h� � ©!X ® T�X�[F]�[sT0�< TÔ­'Wh�2Z�X �Y¬ Wh®h� � ©!XÕ®YT�XF[F]_[sTÔ� ÝK� ©!«áW ÖF: WB®YT�XF[F]_[sTÔ� < T�­UW � � �Ó�Y¬ WY®h��]�©!X�X � [sT�X ��¬ W ����� ­!]�©!X �727 Wj� AD7 [FZM®YT ¬ © � ]�\Øßh� � WKc�T V!Wh® ¬ W � ®Y©�Z � Z � W � � � ß �?� W �Ó��� W �l{ < ]�­�Þ���} � ZF]�VÔT�Xb�W � |• G � © � k Ö k ô �• ADN Ú � � k Ö l ô �• m ã N TÔ� � ] i ô � a ó [sT�X �?¬ W 727 c�Wj� m ã N T0� � ] i�c � P ó [sT�X �e¬ W � AD7 �

c!Q

Page 88: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

• G � © m;7û� � a Ö ó [FT�X �8¬ W 727 c�Wh� G � © mB7û� � a Ö kU[sT�X �8¬ W � AD7 �• < � ä N � k Ö kU©!Z m ]�� ã d ©bTÔ[ � k Ö ó cF[sTÔX �e¬ W 727 �• < � ä N � k Ö kU[sT�X �8¬ W � AD7 �• J;J ã W ¬ WY® ô � k Ö Q [FT�X �?¬ W 727 c�Wh� JeJ ã W ¬ Wh® S � k Ö�� [sT�X �?¬ W � AD7 �• C ]�­ Ý Þ�] � a�kU®h\°[sT�X �?¬ W � AD7 �• :�m ©=©4[sc � k Ö cä�• A � �U� � [sT�X �ج W 727;ÖHA Wj� �-� ©!Xb� � W �Ó� Wh®h��]_V!Wh\^WhXb� ¬ ¨ � XFW � ­!]_W+[ �Y� © ��� WE[sTÔX � ¬ W® T ¬ © � ]_\^ßj� � Wdc=Wh� ¬ ¨ ]�\ � Z ¬_� ]�©�X^� � T�X � V!W �Ó� W�[FW ¬ T'� � T�®YW[FZ�® TÔXF[F]�[FTÔ� Ö: WB®YT�XF[F]_[sTÔ� Ýf� ©!«áWBW � � ���h¬ Wh®h�]_©!XFX � [sT�X �H¬ T �Ó� ­!]_©!X GÛ7�d c�] ¬ [F©!]_� � T �Ó� W �2¬ W � ®Y©!Z � Z � W �[�¨ª]_[FWYXb��]DAs®YTÔ�]_©!XÕT�[FT � � � W �hk ®�ÞsT � ZFWoW C ®YT�®Y]�� ��k [ � ��W � \Ø]�X�W � Ö=: ¨ W C ® T�®h]_� � [FW � WY®h©!X � � � ZF® ã�]�©�XE[FW �o�Y¬ Wh®h� � ©!X � [sT�X �;¬ ¨ GÛ7�d W � � ¬ W �F� ©4[FZ�]_�B[�W�� � ©!] � W C ® TÔ®Y]_� �Y� [�]Dn �Y� WhXb�W � Ö�7 W � [FW �IãXF]�ß � W � T�]_X � ] � Z�W ¬ W � ®h©!Z � Z � W � [�¨ ]�[FWhX���]DAs®YTÔ�]_©!X � W � ZF] � W �D� ©!Z � ®�ÞsT � ZFW8® T�XF[�]�[sTÔ�f�T�Z!c � ©!Xb�

�F���h� WYXb� � W � [sT�X �?¬ T � WY®j�]�©�XMQ Ö Q Ö

ç Ð:æ ñ �?§ É�Ç'Â?º3�?Á �?ºU�g§ § ½hÁ ¶+¥jÉ?§@ W �?� V�ßYXFWh\^WhX�� �£P �DÒÓWj� �2¬�� ­!W �Ó� c P �LÒÓWj� � «+Wh� P �LÒÓWj� � ®o©!Xb� � � �o� ]_\'Z ¬_�Y� [sTÔX �2¬ ¨ ]�Xb�W �ÛãV�T ¬�¬ WU[�W \^T ��� W ®Y©�\ �F� ] � WYXb� � W P óMà WyO Wh�'a ó k à WyOlcgTRV�WY® ¬ W^­ � X �h� TÔ��WYZ � [�¨ � V!ßhXFWY\ØWYXb�6B: Ý à�AKJ ]_Xb�W � ÚwT�® �XkÕÝ Oo<?meG 6 c { ®jÚ Ö�ô=Ö S Ö P"}@c � Z�] � ] ¬��8� ©!Xb� � T ���Ó�Y�o� T �e¬ T \MrY\ØW�®�ÞsTD! X�W[FW � WY®h©!X � � � Z�®h�]_©!X { [sk � WY®h©g} � ZFW ¬ W � [F©�XFX � W � c { ®jÚfa Ö a Ö ó } Ö�7 ©!\Ø\^W � ©!Z �2¬ W � [F©!X�X � W � c ¬ W �W C ® T�®h]_� �Y� ©!Xb� � � � [ � ��W � \Ø]�X � W � T V!Wh® ¬ TB\ � �Þ�©4[FWâ> < TÔ­T�XF[ Ýf� ©!«áWf? Öb: ¨ �h¬ WY®j� � ©!X ® T�XF[�]�[sTÔ�< T�­�[F©!]�� � T �Ó� W �D¬ W � \<rh\^W � ®h©!Z � Z � W � [FW ���h¬ WY®j�]_©!X < ]�­!Þb� � ZFW ¬ W � [F©!X�X � W �L¬ ] � � � W � WhXÕQ Ö�� cWh� ¬ ¨ �Y¬ Wh®h� � ©!X ® T�X�[F]�[sT0� Ýf� ©�«�W�[F©!]��^®h©!\Ø\^W ¬ W � [�©!XFX � W � c � T �Ó� W �^¬ W � \MrY\ØW � ®Y©!Z � Z � W �[�¨ª]_[FWYXb��]DAs®YTÔ�]_©!X T�[sT � � � W �lk ®�ÞsT � ZFW^W C ® T�®h]_� �2k [ � ��W � \^]_XFW � c Wh� � ZF] � ©!Xb��\^WhX���]�©!X�X � W �WYXMQ Ö Q Ö

: T � ]_\'Z ¬ TÔ�]_©!X#XFW � W �F� ©4[�ZF] � T�Xb� � T ��� T � ÚwT�]��WY\ØWYXb� ¬ T ��� T ¬ ]�� � c�[FW � ®Y© �Ó� Wh®h�]_©!X ��¬ ZF] � ©!Xb�T �F�F¬ ] � Z � W � TKAsX � Z~¨ªW ¬�¬ W?[ � ® � ]_V!WeT�ZØ\^]_WYZ4i ¬ W � [�©!XFX � W ��{ ®hÚ Ö=ô4Ö S Ö a^} | ¬ ¨ W C ® TÔ®Y]_� � [�¨ ]�[FWhX���]DA ã® TÔ��]�©!X^[FW ¬ ¨ �h¬ WY®j� � ©!X ®YT�XF[F]_[sTÔ� < T�­�T � � � ®Y© �Ó� ]_­ � W8®Y©!\Ø\ØWe®h©!X � Wh] ¬_¬�� WYX ô ôK� õd� ¬ ¨ª]_\ � Z ¬�� ]_©!X� � TÔX � V�W ��� W'[FZM«�© � ©!X P T � � � ®h© ��� ]�­ � Wdc�Wh� ¬ WV!W � ��Wji �F� ]_\ T�] � WB[�Z «�© � ©!X P c�T�]�X � ] � Z�W ¬ W�F� ©dA ¬ [FW ¬ T ¬ ZF\Ø]�X�© � ]�� � ]_X � �T�Xb��T�X � W ©!Xb� � � �Ø� W � ©!X�[ �Y�Ó�Y� Ö Ý T � TÔ] ¬�¬ WYZ �Ó�B¬ W �o� ®�ÞsTÔX���] ¬_¬ ©!X �P �LÒÓWj� �B¬_� ­!W ��� c P �DÒÓWh� � « Wj� P �DÒÓWh� � ®U©!Xb� � ZF«�]fZFX � � T�]_��WY\ØWYXb�o[FWH>yA ¬ � � T�­!W�[FW �o� T V!WYZ ���¬ ©!Z � [FW � ? { ®jÚ Ö�ô4Ö S Ö P"} Ö�A X]AsX!c ¬ T � WY®j�]_©!X W C ®YT�®YW'[�W �F� ©=[FZF®j�]_©!XE[FW � [F]Bn �h� WYXb� �B�F� ©=®YW ��� Z �T � � � ®Y© ��� ]_­ � W Ös: Wo��T�« ¬ W T�Z ô4Ö a'\^©�X�� � W ¬ W �?� ®�ÞsTÔX���] ¬_¬ ©!X � [FW � ]�\�Z ¬ TÔ��]�©!X Z��] ¬ ] �Ó�Y� Ö

ç Ð�ç ó:9 ±�£�±H½���É?§: WÕ®YT ¬ ®hZ ¬ [FW ¬ ¨ W C ®YT�®Y]�� � [FW � WY®h©!X � � � Z�®h�]_©!X [FW �'�Y¬ WY®h� � ©!X � [sT�X ��¬ ¨ GÛ7�d X � ®YW ��� ]��W ¬ T[ � ��W � \Ø]�XFTÔ�]_©!X�[FW � � � ©�] � W C ®YT�®Y]�� �h� [ � ® � ]_��W � ®Y] ã [FW ��� ©!Z � Ö!: W � W C ® T�®h]_� �Y� ©!Xb� � � � ® T ¬ ®YZ ¬_� W �TRV�WY® ¬ T'\ � ��ÞF©4[�W < T�­ØT�X�[ Ýf� ©!«�W Ö�: W�®YT�XF[F]_[sTÔ� �h¬ WY®j� � ©!X < T�­ [F©�]_� � T ��� W � [�W � ®Y©!Z � Z � W �< ]�­!Þb� { ®jÚ Ö Q Ö�� }fcfWj� ¬ W3® T�XF[�]�[sTÔ� �h¬ Wh®h� � ©!X ÝK� ©!«áWM[F©�]_� � T ��� W � [FW � ®h©!Z � Z � W � T�[ �~� ZsTÔ�W �

c ô

Page 89: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

T�Z4i^[F]Bn �h� WYXb��W � W C ®YT�®Y]�� �h�hk ® T ¬ ®YZ ¬ W � c�Wh� � ZF] � ©!Xb�2W�i �F¬ ] � Z � W � [sT�X ��¬ W �D�F� ©=®�ÞsT�]_XFW �H� ©!Z �Iã� Wh®h�]_©!X � Ö

�·÷ �·÷¼ö �;# �*üN�i�y� L �Qú��'ý]ü=<g�5�7�]�NVJý�üc� J �: ¨ W C ®YT�®Y]�� � [FZ¹� � T�ÒÓWY®j�©!­ � T � Þ�WUW � � ¬ T �F� ©�«sT�«F] ¬ ]_� �H� Z�¨ ZFX#® TÔXF[F]�[FTÔ�B��TÔZ � W'� � ©!Z�VÔT�Xb�[sT�X ��¬ ¨ GÛ7�d c�T�]_� �F� ©=[FZF]��'ZFX�WÕ� � TÔ®YWÕ[sTÔX �U¬ WØ� � TRÒÓWY®h��©!­ � T � ÞFW ÖÄ: W �U� V!ßYX�WY\ØWYXb� � WYXb� � T�Xb�[sT�X �K¬ W2[ � XF©�\^]_XsTÔ�WhZ � [F©!]�V!WhX��HT V!©!] � ZFX �Y¬ Wh®h� � ©!XØ[FW � ZFT ¬ ]�� � < ]_­!Þb�LWj�DZFX^®YT�XF[F]_[sTÔ� �Y¬ WY® ã� � ©!X Ýf� ©�«�WKc4[FW � © � �W � ZFW ¬ T�[�] � � � ]_«FZ��]_©!X [FW ¬ T�\^T ��� WB]�XbVÔT � ] T�Xb�W?[FW;®YW � [FWYZ4i �Y¬ WY®j� � ©�X �

� ©!]��U®Y©�\ � T0�]�« ¬ WÕT V�WY®+®YW ¬�¬ W3[�W ¬ T \^T ��� W3[FZ,«á© � ©!X P cÄ®�¨ W � � ã.k�ã [F] � WÕ®h©!\ ��� ] � W3WYXb� � W ô kà WyO�Wh�;PRk!k à WyO Ö�: ¨ �h¬ WY®j� � ©!X Ýf� ©!«áW;[�©!]_� � T �Ó� W �2¬ W � ®Y©!Z � Z � W � [FW �Ó�Y¬ Wh®h��]�©!X �L� ZF]�VÔT�Xb�W � |• T V!©�] � ZFXFW � X�W � ­�]�WB� � T�X � V!W �Ó� W A T � PRk à WyO\�• rj� � W�[sT�X �8¬ T ��� ­!]�©!X GÛ7�d 1.1 ≤ |ηdet| ≤ 1.5

�• JeJ ã : S < T�Z3ô ô!ó õáW � � ¬ TVÔT � ] T�« ¬ W?[FW � © � ��]�W?[�¨ ZFX �Ó�Y� WYT�ZÕ[FWeXFWYZ � ©!XFW �ä� ZF] � W � \ØWh�L[FW�Ó� [FZF] � W ¬ W�« � ZF]_�o[�W'Ú ©!XF[ Ö~A ¬_¬ W�W � �®h©!X � � � Z�]_�W kÕ� T � ��] � [FWU®Y]_X � VÔT � ] T�« ¬ W � ®Y©!\Ø\ØW¬ ¨ � XFW � ­!]�W;� � T�X � V!W ��� W�[FW ¬ T � T � �]�®hZ ¬ WKc4©�Z ¬ ¨ � XFW � ­!]�W;[ �Y� © ��� W[sT�X �2¬ W � ®Y©�ZF®�ÞFW �8�Y¬ WY® ã� � ©!\^T�­!X � �] � Z�WU[FZ#® T ¬ © � ]_\^ßj� � W Ö~: T3®Y©�Z � Z � W ÚwTÔ]_�W � Z � ®YWj����W VÔT � ] T�« ¬ W�[ �Y� WYXF[�[FW¬ T ��� ­!]�©�X ηdet

cÍWj��W ¬�¬ W T � � � © � ��]�\Ø] ��� W [FW � © � ��W � ZFW ¬ ¨ªW C ®YT�®Y]�� � [FW �Ó�Y¬ WY®h��]�©!X�[FZ� ]�­!XsT ¬�� ©!]�� � Z �á�Y� ]�WhZ � W©!Z � ­bT ¬ W k l ó�� �

• :�m ©=©=[ ã < S � k Ö k!S]c�®Ô¨ªW � �8ZFX ¬ ]_ä�W ¬ ]�Þ�©4©=[^[ � AsXF] � ©!Z �H¬ W � ©!«=ÒÓWh� � ��T�Z � ÖFG ¬~� W � \^Wj�?[FW�Ó� [FZF] � W ¬ WB« � Z�]_��[�WBÚ ©!XF[+WYX+­bT � [sT�Xb�2WhX�V=] � ©!X�l ó�� [FW ¬ ¨ªW C ®YT�®Y]�� � [�Z � ]�­!XFT ¬ Ö=G ¬ W � �®YT ¬ ®hZ ¬���k�� T � ��] � [FW ¬ TÚ � T�®h��]�©!XØ[�¨ � XFW � ­!]_We[ �Y� © ��� W;[sT�X �H¬ ¨ GÛ7�@ Wj��[sTÔX �L¬ W � ®Y©!Z�®�ÞFW ��h¬ WY®j� � ©!\ TÔ­!X � ��] � ZFW � [FZM®YT ¬ © � ]�\Øßh� � WBWhX�Ú ©�XF®h��]�©!X3[FW ηdet

�• G � © mB7û� � S Ö k à WyOlcs®hÚ Ö�ó4Ö S]c � W � \ØWh� � ­bT ¬ WY\ØWYXb�?[FW ��� [FZF] � W ¬ Wo« � ZF]_�?[�WÚ ©�XF[ Ö

: W ��� V�ßYXFWh\^WhX�� � WYXb� � T�Xb�Í[sT�X �g¬ WfX�ZF\ �Y� TÔ�WhZ � [�Z�®YT ¬ ®hZ ¬ [FW ¬ ¨ W C ® T�®h]_� � [FZ�� � T�ÒÓWh®h�©�­ � T � ÞFW[F©!]�V!WYXb�'TRV�©!] � ZFX �Y¬ WY®j� � ©�XÑ® T�X�[F]�[sT0� < T�­ Wj�UZFX �h¬ WY®j� � ©!X ® T�X�[F]�[sT0� Ýf� ©�«�WKc � W ��� WY®j��T�Xb��©!Z ��¬ W � ® � ]��ß � W � ®Y]�� �Y� ®Y] ã [FW ��� Z � ÖÍ: W ��� V!ßhXFWY\ØWYXb� � [�©!]_V�WYXb��WhX �F¬ Z � rj� � WÕT �Ó� ©=®Y] �h�lk T�Z\^©�]�X � Z�XFWo� � TÔ®YW � T �Ó� T�Xb� ¬ W � ®h©!Z � Z � W �8� Z�]_VÔT�Xb�W � |• : ¨ ]�\ � Z ¬�� ]�©!X^� � TÔX � V�W ��� W�[FW ¬ T�� � TÔ®YW[F©!]��·rh� � W � trace

T � a�k à WyO\�• ¬ ¨ªW�i4� � T � © ¬ TÔ�]_©!X¹[FW ¬ T3� � TÔ®YWØ[sT�X ��¬ W ® T ¬ © � ]�\Øßh� � W'[F©!]�� � W � � ©�Z�V!W � [sTÔX ��¬ T �Ó� ­!]_©!XGÛ7�d

1.1 ≤ |ηtracedet | ≤ 1.5

�• ¬ TU� � T�®hW[F©!]_�2TRV�©!] �2��� ©=[FZF]_�8TÔZ�\Ø©!]_X � ZFX�®Y©!Z � [sTÔX �?¬ W CFNM<oÖ

: ¨ªW C ®YT�®Y]�� � [�Z � � T�ÒÓWh®h��©!­ � T � ÞFW�WhX Ú ©�XF®h��]�©!X'[�W ¬ T ¬ ZF\^]_XF© � ]_� � c�[FW ¬ ¨ ]�\ � Z ¬_� ]_©!X�� � T�X � V!W ��� WdcWh��[FW � TÔXF­ ¬ W � ηdetWh�

φcgW � � � W �F���h� WYXb� � W kE¬ TvAs­!Z � WÕQ Ö a ÖÍA XÑ\Ø©�`�WYXFX�Wdc ¬ ¨ªW C ® T�®h]_� � [FZ� � T�ÒÓWY®j�©!­ � T � ÞFW2W � �D[FW8k Ö ô S ó ± k Ö k!k!S { k Ö ô c ó ± k Ö k!k�S�} � ©!Z �f¬ W � [F©!XFX � W �Q{w¬ T � ]_\'Z ¬ T0�]�©�X7} Ö

�·÷ �·÷3� �;# �*üN�i�y� L �Q� ý]�5�i�s�Q����ý�ú��7���¼�s���Q��� �cO><g�i�]�Û�'üsúQ�: ¨ W C ®YT�®Y]�� � [FW � WY®h©!X � � � ZF®j�]_©!X�[FW � ©!«�ÒÓWh� � ��T�Z � W � � ¬ T �F� ©!«FT�«F] ¬ ]_� �:� Z�¨ªZ�X'® T�X�[F]�[sT0�g�T�Z

� WB� � ©!Z�VÔT�Xb�2[FT�X �?¬ ¨ GÛ7�d c4Wh�?T `!T�Xb� ��� ©=[FZF]_�HZFXFWo� � T�®YW;[sT�X �?¬ We� � TRÒÓWY®h��©!­ � T � ÞFWKc � T �Ó� W ¬ W �c!c

Page 90: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

{|~}w� Q Ö aP� A:C ®YT�®Y]�� � [FZÕ� � T�ÒÓWh®h��©!­ � T � ÞFW { < � ä A:C ®Y]_WYXF®j`�}HWhXÕÚ ©!XF®j�]�©�XÕ[FW ¬ T ¬ ZF\Ø]�X�© � ]�� �]�X � ��T�Xb��TÔX � W { WhXMÞFT�Z�� k ­bT�ZF®�ÞFWq}fc�[FW ¬ ¨ ]�\ � Z ¬_� ]_©!X^� � T�X � V!W ��� W { WhXMÞsTÔZ�� k [ � ©!]��W§}@cFWh�8[FW �T�XF­ ¬ W � ηdet{ WYXÕ«sT �hk ­bTÔZF®�ÞFW§}DWh� φ { WhXÕ«sT �ûk [ � ©�]_�Wq} Ö=: W � ® � ©!] iØXF©!] � W �L� W �F���h� WYXb��WYXb� ¬ W �[F©!XFX � W � Wh� ¬ W � ® � ©!]�i � ©!ZF­�W �?¬ W �2� V!ßhXFWY\ØWYXb� �;� ]_\'Z ¬_�Y� Ö

® � ]��ß � W � [FW ���h¬ Wh®h�]_©!X+[FW � ©!«=ÒÓWj� � ��T�Z � Ö�: W �8� V�ßYXFWh\^WhX�� � WhX�� � T�Xb�e[sT�X �8¬ Wo[ � XF©!\Ø]�XFTÔ�WhZ � c� ©!Z �o¬ WU® T ¬ ®YZ ¬ [FWU®YWj����W^W C ®YT�®Y]�� � [F©�]_V!WhXb��T V�©!] � ZFX ® TÔXF[F]�[FTÔ� �Y¬ WY®j� � ©�X < T�­+[FW � ZsT ¬ ]�� �< ]�­!Þb� { ®hÚ Ö Q Ö�� }fc�Wj� ZFX ® TÔXF[F]�[FTÔ� �Y¬ WY®j� � ©�X ÝK� ©!«áW3T ��� ©4®h] �Yk Z�XFWÕ� � T�®YW Öf7 Wh�Ó�W3[FW � XF]_ß � W[F©!]_� � T ��� W ��¬ W � \MrY\ØW � ®Y©!Z � Z � W �ä� ZFWB®hW ¬�¬ W � [FW ¬ T� � T�®hW ¬ ] � � � W � ®Y] ã [FW ��� Z � c�Wj��WhX �F¬ Z � W ¬_¬ W[F©!]_� � W �Ó� Wh®h��W �8¬ W � T�Z4� � W � ® � ]��ß � W �?� ZF]_VÔT�Xb� � |

• ¬ T�� � T�®hW�[�©!]_�hrj� � W�] � © ¬_� WKc G � © m;7û� � S Ö k à WyO\�• ¬ T'[F] � �T�XF®YWWhX�� � W ¬ T'� � T�®hW�Wj� ¬ ¨ �Y¬ WY®h� � ©!X < T�­ [F©!]��·rh� � W ∆φ { W Tag c�� � T�®YWq} � P ô k ◦ �• ¬ T � Wh®Y©!X � � � ZF®h��]�©!X [FW ¬ T3\^T ��� WØ]_XbV�T � ] TÔX���WU[FW ¬ TÕ� � T�®YW Wh��[FW ¬ ¨ �Y¬ WY®j� � ©�X < T�­�[F©!]��rh� � W®Y©!\ �F� ] � WoWhXb� � W ô kUWj��P�PRk à WyO\�• ¬ T�� � T�®hW�Wj� ¬ ¨ �Y¬ Wh®h� � ©!X < T�­Ø[F©!]_V�WYXb�erh� � W[FW®�ÞsT � ­!W � © �F� © �Ó� W � Ö

: W ��� V!ßhXFWY\ØWYXb� � WhX�� � T�Xb�g[sT�X � ¬ WfX�ZF\ �Y� T0�WYZ � c [F©�]_V!WhXb��T V�©!] � Z�X�®YT�XF[F]_[sTÔ� �h¬ WY®j� � ©!X ÝK� ©!«áWT ��� ©4®h] �mk ¬ T�� � T�®YWKcsWh� � ZF] � W ��� WY®j�W ¬ W � ®h©!XF[F]��]_©!X �2� Z�]_VÔT�Xb�W � |• rh� � W[sT�X �?¬ T ��� ­�]�©!X GÛ7�d 1.1 ≤ |ηdet| ≤ 1.5

c!l

Page 91: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

{|~}w� Q Ö SÊ� A:C ® TÔ®Y]_� � [FW � WY®h©!X � � � ZF®j�]_©!X [FW � ©!«=ÒÓWh� � ��TÔZ � WhX Ú ©!XF®h��]�©!XM[FW ¬ T ¬ Z�\^]_XF© � ]�� �]�X � ��T�Xb�T�X � W { WYX�ÞsT�Z�� k ­bT�ZF®�Þ�W§}fc�[FW ¬ ¨ª]_\ � Z ¬�� ]_©!X^� � T�X � V!W ��� W { WhXMÞFT�Z�� k [ � ©!]��Wq}fcFWj�e[�W �T�XF­ ¬ W � ηdet{ WYXÕ«FT �äk ­!T�ZF®�ÞFWq}LWh� φ { WYX3«sT �ûk [ � ©!]_��W§} Ö=: W � ® � ©�]�iØXF©!] � W �H� W �F���h� WhX���WYXb� ¬ W �[F©!XFX � W � Wh� ¬ W � ® � ©!]�i � ©!Z�­!W �?¬ W �2� V�ßYXFWh\^WhX�� �;� ]�\'Z ¬_�Y� Ö

• T V!©�] � ZFXFW � X�W � ­�]�WB� � T�X � V!W �Ó� W A T � PRk à WyO\�• ¬ W � ® T�X�[F]�[sT0� ��Y¬ WY®h� � ©!X Ýf� ©�«�W � Wh®Y©!X � � � ZF]_� � ®Y©!\Ø\^WU[�W � ��T�Z � [�WØ� ` � W�Pdc [F©!]_V�WYXb�T V!©�] � [ �Y� © �Ó� Z�XFWoÚ � T�®j�]�©�X�[~¨ � XFW � ­!]�W � Z ���h� ]_WYZ � W k k Ö P[sT�X �?¬ ¨ GÛ7�@ �• ¬ W � ® T�X�[F]�[sT0� ��Y¬ WY®h� � ©!X Ýf� ©�«�W � Wh®Y©!X � � � ZF]_� � ®Y©!\Ø\^WU[�W � ��T�Z � [�WØ� ` � W a�c [F©!]_V�WYXb�T V!©�] � ZFX ¬ ]_ä�W ¬ ]�ÞF©=©=[ :�m ©=©4[ ã < S � k Ö P ó4Ö

: ¨ªW C ®YT�®Y]�� � [FW � Wh®Y©!X � � � ZF®h��]�©!XU[�W � ©!«�ÒÓWh� � �T�Z � WYX'Ú ©!XF®j�]_©!X'[FW ¬ T ¬ ZF\^]_XF© � ]_� � cR[FW ¬ ¨ª]_\ � Z ¬�ã� ]_©!X�� � T�X � V!W ��� Wdc~Wj�;[�W � T�XF­ ¬ W � ηdet

Wh�φc�W � � � W �F�Ó�Y� WhXb� � W k^¬ TXAs­�Z � W�Q Ö S ÖáA XM\^©R`�WYXFXFWKc

¬ ¨ W C ® TÔ®Y]_� � [FW � Wh®Y©!X � � � ZF®h��]�©!X [FW � ©!«�ÒÓWh� � ��TÔZ � W � �Ø[FW�k Ö l!Q ô ± k Ö k!kba { k Ö l ô�� ± k Ö k!k!a^}� ©�Z �2¬ W � [F©!XFX � W �l{w¬ T � ]�\'Z ¬ TÔ��]�©!X7} Ö

�·÷ �·÷1� �;# �*üN�i�y� L �Qú ý L ����ü�ú ��� �Q��úeý��s�Q���Û�'üsú: ¨ W C ®YT�®Y]�� � [�Z ���h� WYT�Z¹[FW�X�WYZ � ©!XFW � ��T�Zic�©!Z J;J ã τ cáW � � ¬ T �F� ©!«sT�«�] ¬ ]�� ��� Z�¨ ZFX ®YT�XF[F] ã[sTÔ�e��T�Z � W�� � ©!Z�VÔT�Xb�o[sTÔX �B¬ ¨ GÛ7�d c�Wj�oT `bT�Xb� �F� ©4[�ZF]_�eZFXFW�� � T�®hW'[sT�X �B¬ W�� � TRÒÓWY®h��©!­ � T � ÞFWKc

� T �Ó� W ¬ W � ® � ]��ß � W � [FW �Ó�Y¬ WY®h��]�©!X�[FW � ©!«=ÒÓWj� � �T�Z � Wj� � ­bT ¬ WY\ØWYXb��Z�XFWÕ[FW � � � ©!] � ®Y©�Z � Z � W �{ : ©=© � WKc N WY[F]_ZF\ Wh� < ]_­!Þb�@}2[FZ JeJ ã τ Ö~: W �;� V�ßYXFWh\^WhXb� � WYXb� � T�Xb�o[sTÔX �;¬ W�[ � XF©!\Ø]�XsT0�WYZ �[F©!]�V!WYXb�ØT V!©�] � ZFX ® TÔXF[F]�[FTÔ� �Y¬ WY®h� � ©!X < T�­#[FW � ZsT ¬ ]_� � < ]�­!Þb� { ®jÚ Ö Q Ö�� }fc�Wh� ZFX ® T�X�[F]�[sT0�

l!k

Page 92: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

{|~}w� Q Ö�� � A:C ® TÔ®Y]_� � [FZ �Ó�Y� W T�Z^[FWeX�WYZ � ©!XFW � ��TÔZ � ©!Z �f¬ T®h©!Z � Z � W8]�Xb�W � \ � [F]�T�] � W { JeJ ã τF k Ö ô }fc WhX Ú ©!XF®j�]�©�X [�W ¬ T ¬ ZF\^]_XF© � ]_� �Y{ WYX�ÞsT�Z�� k ­bT�ZF®�ÞFWq}fc�[FW ¬ ¨ ]�\ � Z ¬_� ]�©�XE� � T�X � V�W �Ó� W{ WYXEÞsT�Z�� k [ � ©�]_�Wq}fc�Wh�;[FW � T�XF­ ¬ W � ηdet

{ WYX¹«sT �Qk ­bT�Z�®�ÞFW§}@c�Wj� φ { WYX «FT ��k [ � ©!]��W§} Ö~: W �® � ©�]�i3X�©!] � W �2� W �F���h� WhX���WYXb� ¬ W � [F©!X�X � W � Wj� ¬ W � ® � ©!] i � ©�ZF­!W �?¬ W �2� V�ßYXFWh\^WhXb� �;� ]�\'Z ¬��Y� Ö

ÝK� ©!«áWBT `bT�Xb� � T ���Ó�B¬ W � \MrY\ØW � ®Y©!Z � Z � W ��¬ ] � � � W � WYXÕQ Ö Q Ö a Ö�: W �L� V�ßYXFWh\^WhX�� � WYXb� � T�Xb�2[sT�X �¬ WUX�ZF\ �Y� T0�WYZ � c [F©!]�V!WhX���T V!©�] � ZFX ® T�X�[F]�[sT0� �h¬ Wh®h� � ©!X Ýf� ©!«áWØTR`!T�Xb� � T ���Ó� ZFX�WØ[�W � ®Y©!Z ã� Z � W � [FZ J;J ã τ ô ô QKõ Ö�G ¬ `ÑTE� � ©!] �H� ZFT ¬ ]�� �Y� [FWÕ®Y©�Z � Z � W � J;J ã τ | ¬ TE®Y©�Z � Z � W ¬ ��®�ÞFW ©!Z: ©=© � W � ©!Z � J;J ã τ F k Ö aû� ¬ T'®h©!Z � Z � W]�Xb�W � \ � [F]�T�] � W;©!Z N Wh[F]�ZF\ � ©�Z � J;J ã τ F k Ö ô �FWj�¬ To®Y©!Z � Z � W � W ���Ó� W;©�Z < ]_­!Þb� � ©!Z � JeJ ã τ F k Ö l Ö�: W J;J ã τ W � �L® T ¬ ®YZ ¬�� [F]Bn �h� WY\Ø\ØWYXb� � ©!Z �®�ÞsT � ZFW� ` � W�[FWo��T�Z!c�] ¬ Z���] ¬ ] � W;WYXb� � W�T�Z4� � W �?¬ ¨ � XFW � ­!]_Wo[ �Y� © ��� W�[FT�X �?¬ W � [�WYZ4i ��� WY\Ø]�ß � W �®Y©!ZF®�Þ�W �B�h¬ WY®j� � ©!\ TÔ­!X � ��] � ZFW � [�ZE® T ¬ © � ]�\Øßh� � Wdc ¬ ¨ � XFW � ­!]�W[FZE® T�XF[�]�[sTÔ�?�T�ZE[sTÔX � Z�X ® S X�W[FW � TR`�©!X d � k Ö ó c4©!Z WYXF®h© � W ¬ ¨ ]�\ � Z ¬�� ]�©!XU� � T�X � V!W ��� Wo[�W � � � T�®hW �H� trace

T

Wh�2[�W � ®YT�XF[F]_[sTÔ� ���T�Z �?� τT

Ö: ¨ W C ®YT�®Y]�� � [FW � Wh®Y©!X � � � ZF®h��]�©!X�[FZ �Ó�Y� W T�Z�[FW�XFWYZ � ©!XFW � �T�Z J;J ã τ � ©!Z �8¬ T'®Y©!Z � Z � W N W ã[F]�ZF\vcbWYX^Ú ©!XF®h��]�©!X^[FW ¬ T ¬ ZF\Ø]�XF© � ]_� � c![FW ¬ ¨ ]�\ � Z ¬_� ]�©�X'� � TÔX � V�W ��� Wdc4Wh��[�W � T�X�­ ¬ W � ηdet

Wh�φc

W � � � W �F�Ó�Y� WhXb� � W kU¬ TlAs­!Z � W�Q Ö���Ö�A X+\^©R`!WhXFXFWKc ¬ ¨ªW C ® T�®h]_� � [�Z �Ó�Y� W T�ZM[FWXFWYZ � ©!XFW � JeJ ã τ� ©!Z ��¬ W ���� V �h� ]_� �Y� : ©4© � Wdc N Wh[F]�ZF\ Wh� < ]�­!Þb� � ©�X�� � W ��� WY®j�]_V�WY\ØWYXb��[FW k Ö l!l ôK� ± k Ö k!k�k �{ k Ö l!l!Q!k ± k Ö k!k!k ô }fcbk Ö l ôK� ± k Ö k!k�P { k Ö l ô a ± k Ö k!kba^}ÄWh�Lk Ö l�PRQ ± k Ö k!kba { k Ö l�P ó ± k Ö k!k!S�} � ©!Z �¬ W � [�©!XFX � W �l{w¬ T � ]�\'Z ¬ TÔ��]�©!X7} Öl�P

Page 93: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

�·÷ �·÷�� �;# �*üN�i�y� L �]�:�'üN�.�: ¨ W C ®YT�®Y]�� � �©Ô��T ¬ WB[�¨ ]�[FWhX���]DAs®YTÔ�]_©!X3[FW �8�h¬ Wh®h� � ©!X � [sT�X �2¬ T ��� ­!]�©�X3]�Xb�W �Ûã ® � `�© � �TÔ�8®Y© �Iã

� W ��� ©!XF[MT�Z ��� ©=[FZF]_�?[�W � � � ©�] � W C ®YT�®Y]�� �Y� ® T ¬ ®YZ ¬�� W �?�F��� ® � [�WY\Ø\^WhX�� | ¬ ¨ W C ®YT�®Y]�� � [FZ+� � T ãÒÓWY®j�©!­ � T � ÞFWKc ¬ ¨ªW C ® T�®h]_� � [FW � WY®h©!X � � � Z�®h�]_©!X3[FW � ©!«=ÒÓWj� � �T�Z � c4Wj� ¬ ¨ W C ®YT�®Y]�� � [�Z ���h� W TÔZ3[FWXFWYZ � ©!XFW � ��T�Z Ö

ç Ð�) � ³�¶3½j�°´3�¨H0¸�º+´ Á ¶3¥���½�á~���: W �'� ®�ÞFT�Xb�] ¬_¬ ©!X � [FW^[F©!XFX � W �U� �ZF[�] �Y��� ©!Z � [ � �W � \Ø]�XFW ��¬ W � W C ®YT�®Y]�� �h� ®Y©!Xb��]�WYX�XFWYXb�

� WhZ [�¨ � V!ßhXFWY\ØWYXb� � \�Z ¬ ��] ÒÓWh� � ÖÍ7 W � [�W � X�]�W �Ó�'�F� ©�V=]_WYXFXFWhXb�UW �Ó� WYXb��]�W ¬_¬ Wh\^WhX��'[FW ¬ T�®Y©!Xb�T ã\^]_XsTÔ��]�©!X [�W ���F� ©=®YW ��� Z � \'Z ¬ �] ÒÓWh� � c γ �DÒÓWh�c Wh��âT�DÒÓWh�qc ©dz�ZFX { ©�Z �F¬ Z � ]_WYZ �Ó� }DÒÓWh� {w� }oW � �\ T ¬ ]�[FWhXb�]DA � ®h©!\^\ØW3ZFX �Y¬ Wh®h� � ©!X ÖD: W�®�ÞF©!]�i [~¨ªZFX �Y¬ WY®h� � ©!X < T�­ [FW � ZsT ¬ ]_� � < ]_­!Þb�^Wj�¬ W � ®Y©�Z � Z � W � T �F��¬ ] � Z � W �lkE¬ ¨ �Y¬ WY®h� � ©!X ÝK� ©!«áW � ©�Z � ®YT ¬ ®hZ ¬ W � [FW � [F]Dn �Y� WYXb�W � W C ®YT�®Y]�� �Y� c� W � \ØWh�Ó�WYXb�o[�W'®Y©!X � ]�[ �Y� TÔ« ¬ Wh\^WhX�� ��� [FZF] � W ¬ W�« � Z�]_�B[�W�Ú ©!XF[ \�Z ¬ ��] ÒÓWh� Öá: W � ®Y©�Z � Z � W �o¬ W ��F¬ Z �2� ]�­�XF]DAs®YTÔ�]�V!W �8� Z �?¬ T ��� [FZF®j�]�©�XM[FZ�« � ZF]_�?[FWoÚ ©!X�[ ¬ © ��� [FW ¬ T �Ó�Y¬ WY®h��]�©!X�[FZ�® T�X�[F]�[sT0��Y¬ WY®h� � ©!X ÝK� ©!«áW � ©!Xb� ∆φ { W Tag c4W Probe } � P ô k ◦ c G � © mB7û� � S Ö k à WyOïWh� � trace

T � a�k à WyO ÖG ¬ W � �Ø[F] C ®Y] ¬ W^[�¨ªW � ��]�\ØW �U¬ W3« � ZF]��U[FW3Ú ©!XF[ \'Z ¬ �] ÒÓWh� k¹� T � �] � [FW ¬ T [�] � � � ]_«FZ��]_©!XÑ[FW ¬ T\ T ��� W ]_X�VÔT � ] T�Xb��WØ[�W � [�WYZ4i �h¬ WY®j� � ©!X � cgWYX ÚwT�] � T�Xb��ZFXÑT�ÒÓZ � �Wh\^WhXb� � Z ��¬ W ��� WY®h� � W^[FW ¬ T\ T ��� WU]_XbV�T � ] TÔX���W�[FZ#«á© � ©�X P T V!Wh® ZFXFWUÚ ©!XF®j�]�©�X¹Wji � ©�XFWYXb�]_W ¬_¬ Wdc k ® T�Z � W [FW ¬ T ¬ ©!XF­!Z�W� ZFWYZFW2[FT�X �Ĭ Te[F] � � � ]�«FZ4�]�©�X�[FWHXF© � [F©�XFX � W �J� ZF] � ¨ � �WYX�[^TÔZ4i'«FT ��� W � \^T ��� W � Öb7 W � WYXF[sTÔX��c� ZsT�XF[ ¬ ¨ ZFXFW�[FW � � � ©�] � ®Y©!Z � Z � W � ®h]_� � W �8�F��� ® � [FWY\Ø\^WhXb�BW � � � W ¬ ��®�Þ � WKc�©�XEW � �;®YT � T�« ¬ W�[FW��� T ¬ ] � W � ®YWj�8T�ÒÓZ � ��WY\ØWYXb� Ö�: T'®h©!Z � Z � W � Z �2¬ W � trace

T

T � � � ®�ÞF©!] � ]�WKc�Wj�?W � �?[�©!XF® � Z �F�F� ]_\ � W� ©�Z � ®hWh�Ó�WE© ���h� TÔ��]�©!X ÖDA X � ZF]_��W ¬ T#®Y©�Z � Z � W � trace

T

T [FWEXF©�Z�V!WYT�Z � � � T �F��¬ ] � Z � Wdc � ZF] �XF©!Z � T V�©!X � ®Y©!\ � T �Ó�B¬ W;XF©!\'« � Wo[�¨ � V!ßhXFWY\ØWYXb� ��� ZF] ©!Xb� � � �o� W ÒÓWh� �Y�?� T ��¬ ¨ TRÒÓ©!Z��2[FWo®hWh�Ó�W®Y©!Z � Z � WKcHT V�WY® ®hW ¬ Z�]8[�W �Õ� V!ßYX�WY\ØWYXb� � [�WE« � ZF]_�^[FWMÚ ©�XF[ �F�Ó� ® � [FWh\^\ØWYXb�ÕW � ��]�\ �Y� T V�WY®¬ ¨ªT�ÒÓZ � �WY\ØWYXb� Öb: T[�]Dn �Y� WhXF®YW?WhX�� � W8®YW � [FWhZ4i XF©�\'« � W � ®Y© �Ó� W �Ó� ©�XF[ TÔZ^« � ZF]_�Ä[FW2Ú ©!XF[Ø\'Z ¬�ã�] ÒÓWh� � ©!Z � ®hWh����W;TÔXsT ¬ ` � W Ö!G ¬s� W �F�Ó�Y� WhXb�W;WhXbV4] � ©!X+P Ö k ± k Ö��¼� [FW �K� V!ßhXFWY\ØWYXb� � c4T�Z�� � WY\ØWYXb�[F]_�c ¬ ¨ W~n�Wh�Ä[�W ¬ T � ©!Z � � � TÔ®h�]_©!X'[FZU« � ZF]��Ä[FWHÚ ©�XF['\'Z ¬ �] ÒÓWh�g[sT�X ��¬ WH®YT ¬ ®hZ ¬ [FW�XF© � W C ® T�®h]_� �Y�W � �eX � ­ ¬ ]�­!WYT�« ¬ W Ö

ç Ð@? « £�±L���?¶Õ³�§°´3�ƱL¸�³g³��?±D��½h¸�º

7 ©!\^\ØW ¬ T � ]_\'Z ¬ T0�]�©�X-XFW#[ � ® � ]�� � T �3� T � ÚwT�]��Wh\^WhX�� ¬ W � [�©!XFX � W � c ¬ W �3� V!ßYX�WY\ØWYXb� �� ]_\'Z ¬��h� ©�X�� � � � ®h© ��� ]�­ �h� T V!Wh®¹[FW � ÚwTÔ®h�WhZ ��� [FW ®Y© ��� Wh®h��]�©!X � ZFW X�©!Z � T V!©!X � ® T ¬ ®YZ ¬_�Y� c� ©�Z �2¬ W � � � ©!] � W C ® TÔ®Y]_� �Y� [ � ��W � \^]_X � W �e�F�Ó� ® � [FWh\^\ØWYXb� Ö�7 W � ÚwT�®j�WhZ ��� [FW®Y© �Ó� Wh®h�]_©!X�®Y© �Iã� W ��� ©!XF[FWhX���T�Z � T �F� © � �qc � ©!Z � ®�ÞFT � ZFW «F]_X!c�WhX�� � W ¬ WUXF©�\'« � WU[�W � [F©!XFX � W � Wh��®YW ¬ ZF]f[�W �� V�ßYXFWh\^WhX�� �U� ]_\'Z ¬��h� c�V!©!] ��� WY®h��]�©!X ó=Ö Q Ö S Ö Ý ZF] � X�©!Z � T V!©�X � � � T�X � ® � ]��'®hW � ]�X4Ú © � \^TÔ�]_©!X �[sT�X � [FW � As®�Þ�]�W �Ó�U���á� ®h] T�Z4iÑT �F� W ¬_�Y� > ��� ®2A ¬ W � ? ÖÄA X]AsX XF©�Z �'¬ W � T V!©!X � ÚwT�]_��®YW � �]BAsW � Wj�\^] �·k^¬ TØ[F] ��� © � ]��]_©!X+[FW � T�XsT ¬ ` � �W � c�[sT�X �e¬ W � T�®�ä0T�­�W�]�X4Ú © � \^TÔ�] � ZFWe>IWh\^]_[ � W~nà? Ös: TMAs­ ÖQ Ö ó \Ø©!Xb� � W ¬ T�[F] � � � ]_«FZ���]�©!X^[FW ¬ T�\ T ��� We]�XbVÔT � ]�T�Xb�W8[FW ¬ ¨ �h¬ WY®j� � ©!X [sTÔX ��¬ We® T ¬ © � ]_\^ßj� � W8Wj�[FW ¬ ¨ �h¬ Wh®h� � ©!X�[sT�X �e¬ T ��� ­�]�©!XM]�Xb�W �Ûã ® � `�© � �TÔ�qc ��� T ¬ ] ��� W�T V!Wh® ¬ W �;�Ó� ® A ¬ W ��� ZFW'X�©!Z � T V�©!X ��F� ©=[FZF]�� � Ös: ¨ T�®h®Y© � [+WYXb� � W ¬ W � [F©!X�X � W � Wj� ¬ T � ]�\�Z ¬ TÔ��]�©!X^W � �e®h© ��� WY®j� Ö

lba

Page 94: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

[GeV]llM0 20 40 60 80 100 120 140 160 180 200

Even

ts /

Bin

0

500

1000

1500

2000

2500

3000

3500

4000

[GeV]llM0 20 40 60 80 100 120 140 160 180 200

Even

ts /

Bin

0

500

1000

1500

2000

2500

3000

3500

4000DataZ+jetsZ+HFTopDibosonMultijetZH x100

{|~}w� Q Ö ó � @ ] � � � ]_«FZ���]�©!X [FW ¬ T\ T �Ó� We]�XbVÔT � ]�T�Xb�W?[FW ¬ ¨ �h¬ Wh®h� � ©!XØ[sT�X �L¬ W?® T ¬ © � ]_\^ßj� � W2Wh��[�W¬ ¨ �Y¬ Wh®h� � ©!X3[sTÔX �?¬ T ��� ­!]�©!X3]_Xb�W �Iã ® � `!© � ��T0� Ö

ç Ð@A ¢è¸�º+±H¥h¶+§ ½h¸�º@ T�X � ®YW2®�ÞFT � ]_� � W ¬ W � [�]Dn �Y� WhXb�W �f� ��T � W � X � ®YW ��� T�] � W ��kB¬ T;®hW � �]DAF® TÔ��]�©!X'[�W ¬ ¨ ]�[FWhXb�]DAF® T ã�]�©�X�[�W �?�Y¬ WY®h� � ©!X � [sTÔX �?¬ T ��� ­!]�©!X3]_Xb�W �Iã ® � `!© � ��T0�qcáT�]�X � ] � ZFW ¬ W � ÚwT�®h��WYZ �Ó� [FW®h© ��� WY®h��]�©!X �©!Xb� � � � ®YT ¬ ®hZ ¬��h�L� ©!Z �L¬ W � [F©!X�X � W � [FZ d ZFX GÓG T Ö�: ¨ªT�ÒÓ©!Z��H[FW �L�Y¬ WY®h� � ©!X ��� W8� � ©�Z�VÔT�Xb��[sT�X �

¬ T ��� ­!]�©!X�]�Xb��W �Ûã ® � `!© � ��TÔ� � W � \ØWh�eWYXM\^©R`!WhXFXFW�[�¨ TÔZF­!\ØWYXb�W � [FW �F¬ Z � [FWØP ô�� ¬ ¨ªW C ® T�®h]_� �[FZ � ]_­!XsT ¬ ÖÍ7 W �'�Ó�Y� Z ¬ ��T0� � ©�X�� � � � Z��] ¬ ] ���Y��� ©!Z ��¬ T � WY®�ÞFW � ®�ÞFW+[FZ m ]�­!­ � [FW ®YWh�Ó�W ��ÞFß � W�F���h� WYXb� � W�[FT�X �?¬ W �F� ©4®�ÞFT�]�X+®�ÞsT � ]_� � W Ö

l!S

Page 95: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

� � æ �¾ðáî�ò�ê B

_ êb` � ê,ò3` � ê ëxw ç u�ì|u a ëÈê C ð�êäê�ì ë æ a ì é�ê` æ a æ é

ZH → e+e−bb

�Z�s�â�'���â�'�Ý]�Ç� �·¢qÆÇ¡*È�Æn�%�#�i�<�6�¨ g¡* g��D7Ìf� ���£�Q���£�£���£�£�Q���£�£���£�£���Q�£��� ¤t§Ý]�F �%�KÌ �i�'¡i¡ÅK��ÌÛ�£�Q�£���£�£���£�Q���£�£���£�£�Q���£�£���£�£���Q�£��� ¤�Ý

ád¦º¹^¦¨¥ �%½.Ò�®¶K²±»¨³¨³Fµq¶g«û¿�ªh¿�µq¶�¶gÓ�ª�«U¦h¦·¦e¦h¦·¦h¦·¦h¦·¦·¦h¦e¦h¦·¦h¦·¦·¦h¦ ¸§åád¦º¹^¦º¹ Eâ­�®³¨»¨².Ó·¿�ª�«s¿�µq¶�¶gÓ�ª�«�ª�²�³¨­�À�»¨¶gµ§«±»¨².Ó�¦h¦·¦h¦·¦·¦h¦e¦h¦·¦h¦·¦·¦h¦ ¸§åád¦º¹^¦ºÞ ç�¯.Ó:£�«.Ó�³Fª�½�²±»Fµq¶<¿�ª�«�Ó�è�¥�¶gª�Àmª�¶�².« ¦h¦·¦h¦·¦h¦·¦·¦h¦e¦h¦·¦h¦·¦·¦h¦ ¸§¸

Ý]�¨Ù �%�KÌ Å"Ü]�K¡*�KËv�K¡]�@Ì Ì~ÆÇË|Úi�ÇÅ�Ì3�£�Q���£�£���£�£�Q���£�£���£�£���Q�£���Q�dï]Âád¦ºÞ^¦¨¥ FäÓ�¶gÓ�¯¼®²±»Fµq¶M¿�ª�«sÓ�è�¥�¶gª�Àmª�¶K².«û«.»¨Àe­�³FÓ�«=¦·¦h¦·¦·¦h¦e¦h¦·¦h¦·¦·¦h¦�¥@ê?�ád¦ºÞ^¦º¹ ßàµq¯±¯.ª�½�²±»Fµq¶g«�¿�ª�«sÓ�è�¥�¶gª�Àmª�¶K².«â«±»¨À�­�³FÓ�«�¦·¦h¦·¦·¦h¦e¦h¦·¦h¦·¦·¦h¦�¥@ê?�

Ý]� ì ��Å"�@�K¢Ë0ÆÇ¡* ^�fÆÇ�'¡5�iÚZÊ*¢qÚiÆB���i�MÉ&�'¡*�ZË|Ú*�D�fÆ Û���� �£���£�£���Q�£���Q�dï'¤ád¦ æg¦¨¥ ©7ª�«sÓ�è�¥�¶gª�Àmª�¶�².«âÀe­�³¨²±» 4±ª�².«�¿g®¶g«�³Gº®¶�®³ ¤d«¼ª

ee¦h¦e¦h¦·¦h¦·¦·¦h¦�¥§¥@ê

ád¦ æg¦º¹ ©7ª�«sÓ�è�¥�¶gª�Àmª�¶�².«âÀe­�³¨²±» 4±ª�².«�¿g®¶g«�³Gº®¶�®³ ¤d«¼ªeeicr ¦h¦·¦h¦·¦·¦h¦�¥§¥§¥

Ý]�v§ H���¢qËÍ g��ÆÇÌ@ ^�fÆÇ�'¡5�i��ÌmÊi¢ÚiÆD�@Ì£�*�<É��'¡*� �£�£�Q���£�£���£�£���Q�£���Q���'�Ý]� ß �#ÆÇÌ��@¢ÆÇÊ!Ú7�fÆÇ�]¡Ì��i�#È"�]¡]�@¢�I]�D�< "Ü� g¡]� Å��fÆÒÜ7Ú*�"�@ �Ï'�|�*�KÌÛ��"�@ÌH�*�MÊ ����ÝÝ]�DÝ ë��fÆnÜ7Ú*�"�@ �Ï'�2�i��ÌgÛ��"�@Ì �*�<Ê �Q���£�£���£�£�Q���£�£���£�£���Q�£���Q�^Â'Â

ád¦�ád¦¨¥ ç�¯±»¨¶g½�»¨´]ªe¿�ªû¾�µq¶g½�²±»Fµq¶�¶gª�Àmª�¶K²û¿^­#Ô�£�²¼®Ø§Ø§»¨¶�Ø�¦·¦h¦e¦h¦·¦h¦·¦·¦h¦�¥@¹§¹ád¦�ád¦º¹ ©7ªäÔ�£�²¼®Ø§Ø§»¨¶�ØH¿g®¶g«�³Gº®¶�®³ ¤d«.ª

ZH¦·¦h¦·¦h¦·¦·¦h¦e¦h¦·¦h¦·¦·¦h¦�¥@¹§Þ

ád¦�ád¦ºÞ ßàµq¯±¯.ª�½�²±»Fµq¶<¿�ªä³G Ó�²±»F¬K­gª�²¼®Ô�»¨³¨»¨².Óe¿�ª�«4±ª�².«Í¦h¦·¦·¦h¦e¦h¦·¦h¦·¦·¦h¦�¥@¹§ëÝ]� Ý �#ÆÇÌ��@¢ÆÇÊ!Ú7�fÆÇ�]¡Ì��i�#È"�]¡]�@¢�I]�D�< o�*¢��Ì Å"�fÆnÜ7Ú���@ �Ï��2�*�KÌjÛ����@Ìm�i�MÊ �^Â�§Ý]�¨¤ JgÛ@ÚÌ@�@�KËÍ�d¡]� È�Æ�¡*ÅKËÍ ^�fÆnÜ7Ú*� �Q���£�£���£�£�Q���£�£���£�£���Q�£���Q�^Â�¤

ád¦º¸^¦¨¥ ç�¯±»¨¶g½�»¨´]ª ¦h¦·¦h¦e¦h¦·¦·¦h¦·¦h¦·¦e¦h¦·¦h¦·¦h¦·¦·¦h¦e¦h¦·¦h¦·¦·¦h¦�¥@¹§¸ád¦º¸^¦º¹ ¦�Ó�«±­�³¨²¼®².«x¦·¦h¦e¦h¦·¦·¦h¦·¦h¦·¦e¦h¦·¦h¦·¦h¦·¦·¦h¦e¦h¦·¦h¦·¦·¦h¦�¥@Þ§ê

Ý]�Ç�^ïKJH¡* g�LD7Ì@�2�iÆÇÌ@È"¢qÆ�ËvÆ�¡* g¡]�@�Y���£�Q���£�£���£�£�Q���£�£���£�£���Q�£���Q�dÙ7�ád¦¨¥@ê^¦¨¥ ßàµq¶g«±²±¯±­g½�²±»Fµq¶M¿�ª�«â®¯±Ô�¯.ª�«�¦h¦·¦e¦h¦·¦h¦·¦h¦·¦·¦h¦e¦h¦·¦h¦·¦·¦h¦�¥@Þ^¥ád¦¨¥@ê^¦º¹NM1®¯±»B®Ô�³Fª�«s­�²±»¨³¨»F«.Ó�ª�«â¦·¦·¦h¦·¦h¦·¦e¦h¦·¦h¦·¦h¦·¦·¦h¦e¦h¦·¦h¦·¦·¦h¦�¥@Þ§¹ád¦¨¥@ê^¦ºÞNM1®¯±»B®Ô�³Fª·¿^»F«.½�¯±»¨À�»¨¶�®¶�².ªO�g¶�®³Fªe¦e¦h¦·¦h¦·¦h¦·¦·¦h¦e¦h¦·¦h¦·¦·¦h¦�¥@Þ§å

Ý]�Ç�'� íe�'¡*È���ÚÌ~ÆD�]¡2���£�Q�£���£�£���£�Q���£�£���£�£�Q���£�£���£�£���Q�£���Q�dÙ�Ý

l �

Page 96: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

7 WU®�ÞFT � ]_� � W'[ � ® � ]_� ¬ T � Wh®�ÞFW � ®�ÞFW [FZ#«�© � ©!X¹[FW m ]�­�­ � [FZ CFN [FT�X �o¬ W�® T�XsT ¬ ZH →e+e−bb

Öá: W �8���h� Z ¬ ��TÔ� � [FW�®hWh�Ó�W�T�XsT ¬ ` � W©!Xb� � � ���F���h� WYXb� �Y�£k ¬ TU®h©!X�Ú �Y� WYXF®hW N © � ]�©�XF[MWhXa�k!k!l=ô ô!ô õ Ö�6 ®hW;ÒÓ©!Z � c�] ¬_�;� ©�X��WhX#®Y©!Z �Ó� [�¨ T �F�F� ©�«sTÔ�]_©!X � T �B¬ TÕ®h© ¬�¬ T�«�© � TÔ��]�©!X @�� � ©!Z �rh� � W � ZF« ¬ ] �Y� TÔZ'ÒÓ©�Z � XsT ¬�Ý Þb` � ]_® T ¬ d WhV=]_Wkµ : Wj���W ��� Ö: W � ]�­!XsT ¬s� WY®�Þ�W � ®�Þ �B� ©�Z � ®YWh�Ó�WeT�XsT ¬ ` � W8W � � ¬ T �F� ©4[�ZF®h��]�©!XØ[�¨ ZFX «á© � ©�X^[FW m ]_­!­ � T �Ó� ©=®Y] �k Z�X-«á© � ©!X P cÄ©^z ¬ W3«á© � ©!X,[�W m ]�­!­ �U� W�[ �Y� ]�Xb�ßh­ � W�WYX [FWYZ=i ÒÓWh� � [FW � ZsT � ä «!cfWh� ¬ W«�© � ©!X P WhX3[FWYZ4i �Y¬ WY®h� � ©!X � Ös7 Wj����WoT�XsT ¬ ` � WoT � � �B�Ó� T ¬ ] �Ó� W;®h©!X0ÒÓ©!]_Xb�WY\ØWYXb��TRV�WY® ¬ ¨ T�XFT ¬ ` � WZH → µ+µ−bb � ZF] �����Y� WYXb�W ¬ T3\MrY\ØW ��© � © ¬ ©!­�]�W � ZFWØXF©�� � W � ]�­�XsT ¬ Ö�: W � TÔXsT ¬ ` � W � ©!Xb�� � � \ØWYX � W � [sT�X �8¬ Wo® T�[ � W[FW� � T VÔT�] ¬ [FW 7H6B5 W { ®jÚ Ö a Ö a Ö ó } Ö

)ØÐ ð � ³Í½Yº+±H½j¦¹�)´3�¼¥oªI£�º+£�¥�¡ §��: T � Wh®�ÞFW � ®�ÞFW [�Z m ]�­!­ � [FW ®YWh�Ó�WU�Þ�ß � W � ¨ W � ��W~n�WY®h��Z � W^[sT�X �o¬ W � [F©!X�X � W � [�W � d ZFX �G�G TBWh� GÓG « [FZU[ � ��WY®j�WYZ � @£� ®Y© ¬�¬ Wh®h� � W � WhXb� � W?T V � ] ¬ a�k�kba;Wh�f[ � ®YWh\'« � W;aÔk!k!c Ö�: T;��© � © ¬ ©!­�]�WAsXsT ¬ W � Wh®�ÞFW � ®�Þ � W�W � �?[FWYZ=i ¬ W � �©�X � ®�ÞsT � ­ �Y� ] ��� Z � [�¨ ZFX3«�© � ©!X Z

c4Wh�2[�WYZ4i�ÒÓWj� � [�W � ZFT � ä« ] ��� Z � [FZ «�© � ©!X [FW m ]�­!­ � ÖÄ@ T�X �U¬ W ® T � ©^z ¬ W �'¬ W � ��©!X � ®�ÞsT � ­ �Y�U� ©!Xb� [FW � �h¬ WY®j� � ©!X � c®YW � [FW � XF]�W ���8� ©!Xb� ���h¬ WY®j�]_©!XFX �h� [sT�X �e¬ W�®YT ¬ © � ]�\Øßh� � W { ®YWh�Ó�W�T�XsT ¬ ` � W�W � �eXF©�� � W ee} Ö Ý ©�Z �T�ZF­!\ØWYXb�W � ¬ ¨ªT�®Y®hW � �T�XF®YW�[FZ � ]�­�XsT ¬ [sT�X �ج W+® T�XsT ¬ ZH → e+e−bb

c ¬ W�®YT �Ø� T � ��]�®hZ ¬ ]_W �©^z ¬ ¨ªZ�X�[FW ���h¬ Wh®h� � ©!X ��� W � � ©!Z�V!WØ[sT�X ��¬ T �Ó� ­!]_©!X#]�Xb�W �Ûã ® � `�© � �TÔ��W � � � ­!T ¬ Wh\^WhX���TÔXsT ¬ ` �Ó�{ ®YWj����WeTÔXsT ¬ ` � W2W � �DXF©Ô� � W eeicr } Öb@ TÔX �K¬ TB® T � ©dz ¬ W �f¬ W � ��©!X � ®�ÞsT � ­ �Y�D� ©�X��D[FW � \'ZF©!X � c!®YW �[FW � XF]�W ���f� ©�X�� �Ó�Y¬ Wh®h��]�©!XFX �Y� [sT�X �D¬ W � `���ßY\ØW8[�W8\�ZF©!X { ®hWh�Ó�W8T�XsT ¬ ` � W2W � �DXF©�� � W µµ

} Ö Ý ©!Z �T�ZF­!\ØWYXb�W ��¬ ¨ªT�®h®YW � ��T�XF®hWB[FZ � ]_­!XsT ¬ [sT�X ��¬ WB®YT�XsT ¬ ZH → µ+µ−bbc ¬ We® T �2� T � ��]�®YZ ¬ ]�W � ©^z

¬ ¨ ZFX [FW � \'ZF©!X ��{�� ZF] � ®�ÞsT �F� W TÔZ [ � ��WY®j�WYZ � [FW�\'Z�©!X7}8X~¨ªW � �o]_XF[FWYXb��]DA �X� ZFW�­ � ��®hW k � T� � TÔ®YWdc�W � � � ­bT ¬ WY\ØWYXb��T�XsT ¬ ` �Ó�={ ®YWj���W^T�XsT ¬ ` � WØW � �'XF©�� � W µµtrace } Ög7 W �H� ZFTÔ� � WÕT�XsT ¬ ` � W �eeceeicr c µµ

cFWh�µµtrace ©!Xb� � � � T�XsT ¬ ` �Ó� W �8�Ó�Y� T ��� \ØWYXb� � ©�Z �2¬ W � d ZFX � GÓG T Wj� G�G « Ö

: W � TÔXsT ¬ ` � W � ©!Xb� � � ���Ó� T ¬ ] �Ó� W � [FT�X � ODÒÓWj� � ® T0Ú Wdc k � T � �] � [FW � As®�ÞF]_W �Ó� d2nno< { X ã�Z �F¬ W � }fcR®hÚ Ö a Ö a Ö ó c � ZFWKXF©!Z � T V!©�X �Í��� ©=[FZF]_� � � ©�Z ��¬ W � [F©�XFX � W �Í�Ó� W ¬�¬ W � Wh� � ]_\'Z ¬�� W � c � ZF]�VÔT�Xb�¬ ¨ © � [ � Wo[FW �?� ��T � W � [ � ® � ]��W � ®h] ã [�W ��� ©!Z � cFV!©!] � As­ ô4Ö P ÖP Ö8: T �����jã ���h¬ WY®j�]_©!X {w� Wh®h��]�©!X ô4Ö a Ö S k ô4Ö c^}@c � Z�] � W®Y©!\ � © � W[FW |� ¬ T ���h¬ WY®j�]_©!X+[FW �?� V�ßYXFWh\^WhXb� �Q� ZF] ®h©!Xb�]_WYXFXFWhXb�eZ�XM«á© � ©�X Z

Ö�n X�[�WY\^T�XF[FW[F©!X�®� ZFW^XF© ��� V�ßYXFWh\^WhX�� � T�]_WYXb��T�Z�\Ø©!]_X � [FWYZ4i ¬ W � ��©!X � ®�ÞsT � ­ �Y� cgWj� � ZFW ¬ T3[F] � � � ] ã«�Z��]_©!XE[FW ¬ WYZ � \^T ��� W�]_X�VÔT � ] T�Xb��W � ©!]_�e®Y©!\ � TÔ��]�« ¬ W�TRV�WY®'®hW ¬_¬ W�[FZ «á© � ©!X Z

Ö~: W �®h©!Z � Z � W � [FW?®YWj���W �F� WY\Ø]�ß � W � ��T � W?[FW ¬ T �F�Ó�jã ���Y¬ WY®j�]�©�X � ©!Xb�H[F]Bn �h� WhX���W �D� ©�Z �f¬ W �� ZsT0� � W�T�XFT ¬ ` � W � ee

ceeicr c µµ

c�Wh�µµtrace c�T�]�X � ] � ZFW � ©!Z �2¬ W � d ZFX � GÓG TØWj� G�G « Ö

� ¬ T �Ó�Y¬ Wh®h��]�©!X3[FW ��� V�ßYXFWh\^WhXb� �·� ZF]~®h©!Xb�]�WhXFXFWhX��8TÔZÕ\^©�]�X � [FWYZ=i�ÒÓWh� ��� T � \^] � ®hWYZ4i�Ó�Y¬ WY®h��]�©!X�X �Y� ®Y] ã [FW ��� Z � Ö: W � ®h©!Z � Z � W � [FW ®YWj����W [�WYZ4i4]�ßh\^W � ��T � W [FW ¬ T �F����ã�Ó�Y¬ WY®h��]�©!X � ©!Xb� �F� T0�] � ZFWh\^WhXb�2]�[FWhXb�] � ZFW �2� ©�Z ��¬ W �ä� ZsTÔ� � WT�XsT ¬ ` � W � Ös: W ���h� Z ¬ ��TÔ�[ �Y� WYXF[ ¬�� ­!ß � WY\ØWYXb�U[FW � d ZFX � GÓG T Wh� GÓG «!c�®YT �'¬ W � ÒÓWj� � `�©!Xb� � � �Õ���h¬ WY®j�]_©!XFX �h�[�]Dn �Y� Wh\^\ØWYXb� � �

l ó

Page 97: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

� ¬ ¨ � �] � ZFWh�T�­!W [FW � ÒÓWh� � [�W^« [FW ��� V�ßYXFWh\^WhXb� � T `bTÔX���T�Z�\^©!]_X � [FWhZ4iÕÒÓWh� � ÖÍ7 Wh�Ó�W� ��T � W � W � � kØ��� [FZF] � W ¬ W�« � ZF]��;[FW�Ú ©!XF[M\'Z ¬ ��] ÒÓWj� �F� ©RV!WhXsT�Xb�oW ��� WhXb�]�W ¬�¬ WY\ØWYXb�;[�W �� V!ßhXFWY\ØWYXb� � Z + jets ¬�� ­�W ��� c k ®YW � �T�[FW[FW ¬ ¨ªT�XsT ¬ ` � W:��*[FZ � TÔX��?®hWh�Ó�W �F� Wh\^]_ß � W � �T � WKc ¬ W �2� V�ßYXFWh\^WhX�� �e� ]�\'Z ¬��Y�H���Y¬ WY®j�]�©�XFX �Y�2� ©!Xb�8®Y© �Ó� ] ã­ �Y�?� ©!Z �h� Z�¨ ] ¬��2� W �F� ©4[�ZF] � WYXb�eT�ZM\Ø]�WhZ4i ¬ T ��� T ¬ ]�� � Ö

a Ö?: ¨ªT�ÒÓZ � ��WY\ØWYXb�?®Y]_X � \^TÔ��] � ZFW � ©!Z � © � �]_\^] � W �L¬ T�VÔT ¬ WhZ � [FW � VÔT � ]�T�« ¬ W � ®h]�X � \ TÔ��] � ZFW �[FW �e¬ W � ��©!X � Wj�e[�W � ÒÓWh� �H{ � WY®j�]_©!X ô4Ö l^} ÖS Ö?: ¨ Z��] ¬ ] � TÔ�]_©!X+[�¨ ZFXFW���WY®�ÞFX�] � ZFW'[FW ���h¬ WY®j�]_©!X T VÔT�XF® � Wdc � ZF] � W � \^Wj�BZFX�W ���h� T � TÔ�]_©!XT�®h® � ZFWE[FZ � ]_­!XsT ¬ Wj� [FZ,« � Z�]_�Ø[FW+Ú ©!XF[!cfWj� [F©�XF®M[~¨ T�Z�­!\^WhXb�W �ج T � WhX � ]_«F] ¬ ]_� � [FW¬ ¨ T�XFT ¬ ` � W Ö47 Wh��©�Z��] ¬s�F� ©=[FZF]��LZ�XFWeVÔT � ] T�« ¬ WäAsXsT ¬ We[�] � ® � ]_\^]_XsT�Xb�WKc � ZF] � W � � k�� ��T�« ¬ ] �¬ T ¬ ]�\Ø]_��W { � WY®j�]_©!X ô=Ö PRkd} Ö

�FÖ?: WD® T ¬ ®YZ ¬ [FW ¬ T ¬ ]_\^]��W � Z ��¬ T � WY®j�]_©!X�W C ®YT�®YWL[FW ��� ©=[FZF®h��]�©!X�[FZ�«�© � ©!X�[FW m ]�­!­ ��� Z �¬ T�VÔT � ]�T�« ¬ W·AsXsT ¬ W;[�] � ® � ]_\^]_XsT�Xb�WKc4T V�WY®oZFX ¬ ©!­!]�®h]�W ¬ ]�X�Ú © � \ T0�] � ZFW8T�[FT � � ��{ ®�ÞsT � ]_� � Wc�} Ö

@ Z � T�Xb�2\ T��ÞFß � WdcÔÒh¨ªT�]áW �Ó� WYXb��]�W ¬_¬ Wh\^WhX��H� � T VÔT�] ¬�¬�� T�Z3XF]�V!WYT�Z3[FW ¬ T �F����ã �Ó�Y¬ Wh®h��]�©!X3[sTÔX ��¬ W �T�XsT ¬ ` � W � eeWj�

eeicr Ö�N TU®Y©�X�� � ]_«FZ��]_©!X+T `bT�Xb� � � �o�F¬ Z � ]�\ � © � ��T�Xb��WB[sT�X � ®hWh�Ó�W[FW � XF]�ß � WKcW ¬_¬ W � W � T � T � ®Y©!X ���� ZFWhXb� �F¬ Z � [ � ��T�] ¬�¬_� W � T �+¬ T � ZF]_��W Ö?: W �0� ZFTÔ� � W T�XFT ¬ ` � W � ©�X�� � � ���� T ¬ ] ��� W � WhX � � � ©!]_��W;®h© ¬�¬ T�«�© � TÔ��]�©!X ®Y©�\^\ØW � ©!Z � c � T � Wji4WY\ �F¬ Wdc�[ � �W � \Ø]�XFW � [FW � ÚwT�®j�WYZ ���[FWDXF© � \^T ¬ ] � T0�]�©�Xo[ �Y� WYXF[FT�Xb�f[FW �;� ZsTÔ� � W � ®�ÞsT�Xb�] ¬�¬ ©�X � c � ©!Z � © � �]_\^] � W � ¬ ¨ªT�®Y®h© � [�WYXb� � W ¬ W �[F©!XFX � W � Wh� ¬ T � ]_\'Z ¬ T0�]�©�X { ®hÚ Ö�ô4Ö ó } ÖiR W �F�Ó�Y� WhXb�W � T�]�[�©!XF®���©!Z��eT�Z ¬ ©!XF­Ø[FW�\^©!X�Wji � © ��� c¬ W �2���Y� Z ¬ �TÔ� � [�W � T�XsT ¬ ` � W � ee

Wh�eeicr cF\ TÔ] ��� ­bT ¬ Wh\^WhXb� ¬ W �2���Y� Z ¬ �TÔ� � [�W ¬ T'®Y©!\�«F]�XsTÔ] � ©�X[FW �·� ZsTÔ� � W�T�XsT ¬ ` � W � Ö

l!Q

Page 98: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

{|~}w�áô4Ö PÇ� 7 ÞsTD!�XFWo[FW ¬ ¨ªT�XsT ¬ ` � W ZH → l+l−bbÖ

l ô

Page 99: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

)ØÐ:G ñ �?§Î´3¸�º�º3É2�?§P ÷��ä÷¼ö � � J üs�â�������.�s�Q� �Q�U���s�Q� L ���: W � [F©!X�X � W � T�XsT ¬ ` ��� W � ®Y© ��� W ��� ©!XF[FWhXb� k�¬ ¨ ]�Xb� � ­ � T ¬ ]�� � [FW � [F©!XFX � W � [�W � d ZFX � G�G TWh� GÓG «�P^cgWh�UZ�XFW � T � �]�W^[FW � [�©!XFX � W � [FZ d ZFX G�G «saMWYX � WY­!] � � ��� W � ÒÓZ �T� Z�¨ªT�Z � Z�X X=Z�\ �h� ©a ��ô l�Q!k Ö Ý ©�Z �^��¬ Z � [FW � ]�\ �F¬ ]_®Y]_� � cÍ[sT�X �^¬ T � ZF]��W d ZFX � G�G «-[ �Y� ]�­!XFW � T ¬ ¨ WYX � WY\'« ¬ WM[�W �d Z�X � GÓG «�PBWj� GÓG «�a�T�XsT ¬ ` ���h� Ö=: W � [F©�XFX � W � ©!Xb� � � � ®Y© ¬_¬ Wh®h� � W �D� T �D¬ W8[ � ��WY®j�WYZ � @�� WYXb� � WT V � ] ¬ aÔk!kba�Wh�?Ú � V � ]�W � a�k!k!Q � ©!Z �2¬ W d ZFX G�G TUWj�eWhXb� � WHÒÓZF]_XMa�k!k!QUWh�?[ � ®YWh\'« � W'a�k�k!c � ©�Z �

¬ W � d ZFX � GÓG « ÖFA ¬_¬ W � ©!Xb�2WhX � ZF]��W � � �;� WY®h©!X � � � Z�]_�W ��� T �L¬ W �F� ©!­ � T�\Ø\^W?[FW � WY®h©!X � � � Z�®h�]_©!X[sk � WY®Y©]c � ZF] � \Ø] � W � [sTÔX �?¬ WBÚ © � \ TÔ� 7H6B5 ã � � WhW �H{ ®jÚ Ö a Ö a Ö ó } Ö: ¨ T�XFT ¬ ` � W�©^z ¬ W � [FWYZ4i �Y¬ WY®j� � ©�X �B� ©�X�� ���h¬ WY®j�]_©!XFX �h� [sT�X �e¬ W�® T ¬ © � ]_\^ßj� � W �h¬ WY®j� � ©!\ TÔ­!X �jã�] � Z�W { XF©�� � W ee

}gT � � �H��� T ¬ ] ��� WHWYX�Z��] ¬ ] � T�Xb� ¬ W �Í� ä�]�\ � a ALN ÞF]�­!Þ � � { ®hÚ Ö a Ö a Ö ó }�Ô®hW ¬�¬ WL©dzUT�Z\^©�]�X � ZFX3[FW ���Y¬ WY®j� � ©�X � W � � �Ó�Y¬ Wh®h��]�©!X � [sT�X �L¬ T ��� ­�]�©!X^]�Xb�W �Ûã ® � `�© � �TÔ� { XF©�� � W eeicr }DT � � ���� T ¬ ] ��� W;WYX�Z��] ¬ ] � T�Xb� ¬ W �2� ä�]�\ � ADN ]�XF® ¬ Z � ]_V�WdcFV!©�] � ��TÔ« ¬ WYT�Z ô4Ö P Ö�: W � ä�]�\ a ALN ÞF]�­!Þ � �8XFW®Y©!XbV=]�WhXb� � T �Jke¬ ¨ªT�XsT ¬ ` � W eeicr ® T � ] ¬ ®Y©!Xb�]_WYXb�fTÔZU\^©!]_X � [FWYZ4i�©!«=ÒÓWj� �f�h¬ WY®j� � ©!\ TÔ­!X � ��] � ZFW �[FW �T � P�a à WyO Ö�: ¨ªT�XsT ¬ ` � W eeicr X�W�[FWY\^T�XF[�W � Z�¨ªZ�X �Y¬ Wh®h� � ©!XU]_[FWYXb�]BA � ®h©!\Ø\^WDZFXU©!«=ÒÓWj��Y¬ WY®h� � ©!\^T�­!X � �] � ZFWdc!Wj� ¬ ¨ TÔZ�� � W ¬ ¨ �h¬ Wh®h� � ©!X � W?� � ©�Z�VÔT�Xb�L[FT�X �H¬ T ��� ­�]�©!XØ]�Xb�W �Ûã ® � `�© � �TÔ�D[F©!]��rh� � W?]�[FWhXb�]DA � ®Y©!\Ø\^W2Z�X^©!«�ÒÓWh�K��T�Zicb®hÚ Ö Q Ö a Öb: W � ä�]�\ ALN ]�XF® ¬ Z � ]_V!W?Z���] ¬ ] ���H� ©!Z �D¬ ¨ TÔXsT ¬ ` � W

eeicr ®h©!\ � © � �W�[�W �o� V�ßYXFWh\^WhXb� � T V!WY®ØT�ZE\^©!]_X � Z�X¹©!«=ÒÓWh� �Y¬ Wh®h� � ©!\^T�­!X � �] � Z�W�[FW �T ��^à WyO Ö

G XF]_��] T ¬ WY\ØWYXb� ¬ W � ä�]�\ a ADN ÞF]_­!Þ � �D®Y©�\ � © � ��W;S�Q�a�l � Q!c�k { l!S^PRk�S�l!l ô } � V!ßhXFWY\ØWYXb� ��� ©�Z �¬ W d ZFX G�G T { ¬ W � d ZFX � GÓG «7}fc=T ¬ © ���J� ZFW ¬ W � ä�]_\ ADN ]�XF® ¬ Z � ]_V�WeWhX^®h©!\ � �WeS!k ô£�^��ô a ô a { Q ô ac!c!QUl ó Q�} � ©�Z �2¬ W d ZFX G�G T {w¬ W � d ZFX � G�G «7} Ö�: TU�T�] ¬_¬ We[FW �8� ä�]�\ � ADN ]�X�® ¬ Z � ]_V�W�T [�©!XF®[M¶rh� � W k XF©!Z�V�W T�Z �Ó� [FZF]��W � ©!Z � [F]_\^]_X=Z�W �D¬ W � �Wh\ �F� [FW;®YT ¬ ®hZ ¬ Ö�6 ]_X � ]&c�XF©!Z � T V�©!X � ÚwT�]��H[�W �� ©!Z �Ûã � ä�]�\ � [FW �f� ä�]�\ � ADN ]�XF® ¬ Z � ]_V�W2[FW � d ZFX � GÓG TBWh� G�G «ic!T V!Wh®8[�W � ®Y©�Z � Z � W � T �F�F� © �F� ] � W �Wh�� � ß �¬ �Ô®�ÞFW � c � ©!Z � X~¨ªWhX ¬ WjV!W � � ZFW ¬ W �o� V!ßhXFWY\ØWYXb� ��� T�X � ]_X�� �Y� rh� ��� ©!Z � XF©�� � WØT�XsT ¬ ` � W Ö: W � ®Y©!Z � Z � W �e� ©!Xb� ¬ W �2� ZF]_VÔT�Xb��W � c�©!X+[FWh\ TÔXF[FW�T�Z+\^©�]�X � |

�*ZFX ©!«=ÒÓWh� �Y¬ WY®j� � ©�\ T�­�X � ��] � ZFWØ[�¨ª]_\ � Z ¬�� ]�©!X � � T�X � V!W ��� W � Z �á�Y� ]�WYZ � W k P óEà WyOXcgT �=ã� T � �WhXsT�Xb�3TÔZ 727 ©!Z�TÔZ AD7 [FZ�® T ¬ © � ]�\Øßh� � W Öf: ¨ ©!«=ÒÓWj� �Y¬ WY®j� � ©�\ T�­�X � ��] � ZFW+[F©!]��T V!©�] � ZFXFW8] � © ¬ TÔ��]�©!XU]_X�Ú �Y� ]�WhZ � W k k Ö a�cbWh�LT V!©!] � [ �Y� © ���e�F¬ Z � [FWel!k � [FW � ©!X � XFW � ­!]_W[sTÔX �e¬ WB® T ¬ © � ]�\Øßh� � W:�

�*ZFXE©!«=ÒÓWh�e��T�Z T ��� ©4®h] �Xk ZFXFW�� � TÔ®YW�[~¨ª]_\ � Z ¬�� ]_©!X+� � TÔX � V�W ��� W � Z ���h� ]�WhZ � W k PRk à WyOlcWj�;T �F� T � �WYXFT�Xb� kU¬ ¨ GÛ7�dÖ: W�XF©�\'« � Wo��©���T ¬ [�¨ � V�ßYXFWh\^WhXb� � ®h©!X � ��]_��ZsT�Xb�BTÔ]�X � ] ¬ W �?� ©�Z �Ûã � ä�]�\ � ADN ]_XF® ¬ Z � ]�V!W�W � �8Ú © �Iã�Wh\^WhX�� �Ó� [FZ�]_� k PRl!k l!l!c { P�k � Q ô S�P"} � ©!Z �2¬ W d ZFX G�G T { ¬ W � d ZFX � G�G «�} Ö

P ÷��ä÷3� Q úQüN���y� L �������Q�s�Q� L ���\�i���.úP ´�.�Q�s�)�±� LR0S�TVU+W5XZY[SZ\/SZY^]_Ta`[b�c[d5efY^]_T {Gg�hji�klimklimnlimn }fcpo S�T1\1efc[WqefrLT�b�c�Y�T {"gqs S�Tt]tu k u(v[rwb�Sxeyd^eqYz]Vc�Y

{ b�|f` o X�\1S/v�S h |5Y g ]_rL|5Y�Y�S�\1S�Y^]&v�S�T�]_b�e~}tS g ]_|5�5b�e {�� S�T c v[c g e o |5b�rL\1X+]_btS1|5c�v�c�Ttd�Tt]�XZ\/S k\&c�|5Y[T }fc S+] o SZT�\1efc[WqefrwT>` o | g T�v�S o c�\/rwY�|fT�rL]�U {Gg�hji�klimkli k�i k }fc v�U A Y�rwT { efb o e g | owo ef`�|fb_eq]�rw|5Yô ôq� õ&c |5Y^]=U�]�U�SZY o S�WfUZT�eyWfS g o S { bt| g SZTtT�SZc[b >t� e h SZ��eq]_e^��c�e o r�](dl�pbt| g SZTtT�|5bj�pv�c { e g�� eq�5S�rLY h |5b@u

� �

Page 100: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

�=U�b�rL|lv�S � � rw\��c�Y��t�je � ����� ����� � � T � rw\ � ��� � ��� n � {� � i��y��i��5�� eyW�b�r o kf�5�5k u h U+W�b�rwS�b kf�5�5�5���c�Y��t�(` � � ����� ����� � � T � rw\ � ��� � ��� k � { kl�5i��¡�[i��5�� }tc[rwY kf�5�5� u¢eq| ¶ ] kf�5�^£f���c�Y��t�(` k � �[�7� ����� � � T � rL\ � �O� � ��� � � { k��5iL�y�[im�f� � { kf�[i��~kli��5�� | g ]�|5`�btS kq�5�^£ u�v�U g SZ\�`�b�S kf�5� �l¤ � �[�7� ����� � � T � rL\ � �O� � ��� � � { k��5iL�y�[im�f� � { kf�[i��~kli��[�}tc�Tt¥�c s efc�b�c�Y kq�z£ � �5�^� � �[�7� ����� � � T � rL\ � �O� � ��� � � { k��5iL�y�[im�f� � { kf�[i��~kli��^k� �[�7� ����� � � T � rL\ � �O� � ��� � � { k��5iL�y�[im�f� � { kf�[i��~kli��f�� �[�7� ����� � � T � rL\ � �O� � ��� � � { k��5iL�y�[im�f� � { kf�[i��~kli��^¦��� � £li�� � � � rw\/T8efY�e o d�T�U�T { |5c�b o SZT8��c�Y�T����je[¤����(` � S+]8���(` k�i R-SZT8eqY�e o d�TtSZT

eeS+]

eeicrc[]_r o rwTtSZY^]>btSZT { S g ]_r�W5SZ\/SZY^] o S�T>T � rw\/T kf§�¨�� rw� ��{ ]�S�] §�¨ rLY g o c�T�r�W5S i

\Veq]�rw¥zc�S�© g e h ��v�¥5� i�§ Y�T�c�r�]_S o e o c�\/rwY�|fT�rL]�U8rwY^]_U��5b�U�S&eVU+]_U g e o g c o UZSªe¡WfS g o s S�Y�T�S�\&` o Sªv�S�T]_b�rL�5�5S�b�TO«f¬8� �~k5¦ ¬>¬ � «f¬ �~k5¦ ��R n « �¡k5¦5�¢{ |5c�b o S­��c�Yx���je � o S�TO�Oc�Y[TO�t�(` �+i � o T>b�SZ¥zc�rLXZbtSZY^]efc�\1|frwY�T=c�Y�}tS�]�v s UZY[SZb��frwS®]_b�efY�T@W5SZbtT�SOT�c { UZbtrwS�c�b�S�¯ �~kf¦ �°S²± i R-SZT�S�Y�T�S�\&` o S�T�v�S®]_btrw�5�fSZb�T«f¬8� �¡k5¦ ¬>¬³S�]O«f¬ �¡k5¦ �OR n « �~k5¦ Y s |fYz]®v�S { efT�v�S { btSZT g e o Sq¤ � g�hji�k�i kli´�^� ¤[S+]>r o T { SZbt\1S+]�]_S�Y^]v�|5Y g v�S g e o g c o SZb o e o c�\1rLY�|5TtrL]_U�T�rw\ { o SZ\/SZY^]�SZY�\1S�T�c�b�efY^] o S�W5| o c�\1S°v�S­v�|5Y[Y�UZS�T�¥zc s r o T|5Y^]�e gZg S { ]_U�v�c�b�efY^] g SZT { U�b�rw|�v�S�T iz§ Y { b�eq]_rL¥zc�Sf¤z|5Y/T�|5\/\/S®]_|5c�T o S�Tp` o | g Tpv�S o c�\/rwY[|5T�r�]_Ug |5btb�SZT { |fY�v�efY^]�efclµ¶v�|fY�Y�UZS�TªS�Y�b�S��5rwT@]_btUZSZT�¤ { |5c[b­|f`[]_S�Y�rwb o e o c�\/rwY�|5TtrL]�U�rwY^]�UZ�5btUZS7]_|f]_e o Sv�S o s U g�� efY^]_r oLo |5Y i¸· Y¹cl]_r o rwTtS { |5c�b g S o eVc�Yº|fc[]_r o T@]�efY�v�efb�v¹v�S g e o g c o v�S o c�\1rLY�|5TtrL]_U�© o clu\1r�]_|�| o i´{ dz� ô £ �Kõ T�S8]_bt|5c[WqefY^]�v�efY�T o S { e g�� ef�5S°rLY h |5b�\1eq]�rw¥zc�S�©(v�¥ ��c[]_r o � i[· Y$]_b�|fc[W5S­efrLY�T�rc�Y�S o c�\/rwY�|fT�rL]�U�v�S �5i��^£q� ± �[i��5�5��h ` −1

� n[i��^£5£ ± �[i�� �5� h ` −1 �»{ |5c�b o SO��c�Y/���je � o S�T��Oc�Y[T���(` ��i

P ÷3�ä÷6� � ý L�¼ � L �.�5�7�t�.�s���Q��� L �NÐ��Q�A U�����]�R s U�]_e { SOv�S o e { b�U�u(T�U o S g ]_rL|5Y g |5Y�TtrwTt]�S�¯­T�U o S g ]_rL|5Y�Y�S�b o SZT�U�W5X�Y�SZ\/SZY^]�T�e¡d5efY^]>efc1\1|frwY�T

v�SZclµVU o S g ]_b�|fY�T�v�eqY�T o S g e o |5btrw\/X�]�b�S>U o S g ]_b�|f\Vef�fY�U�]�rw¥zc�S { b�|¡W5S�Y�efY^]>v s c�Y$`¸|5T�|fY$½¾¤�S�]�efc\1|5rLY�T�v[SZclµ/}tS�]_T i �=|fc�b8efc��f\1S�Yz]�SZb o s e g�g S { ]�efY g S&v�c¶Ttrw�5Y�e o ¤ o SZT�U�W5X�Y�SZ\/SZY^]�T g |5Y^]_S�Y�efY^]v�SZclµ�U o S g ]�b�|5Y�T¾v�|5Y^]pc�Y/e {�{ eqbt]_rLSZY^]�¯ o e�b�UZ�frw|5Y�rLYz]�SZbju g b@d5|5T@]�eq]pTt|5Y^]pUZ�^e o SZ\/SZY^]peqY�e o d�TtUZT i� |5\1\/SOr o Y s dVe { efT�v�S�b�S g |5clWlbtSZ\/SZY^]�SZY^]�b�S o S g e o |5btrw\/X�]_btS�S�] o e�b�U��5rw|5Y1rwY^]_S�b@u g btdf|5Tt]_eq]y¤g SZT�v�SZc�µ o |f]_T�v�Sªv�|5Y�Y�U�SZT�Tt|5Y^]�|5b@] � |f�5|5Y�efc�µ i � S+]�]_S�efY�e o d�T�S­SZTt] o e { b�S�\1rLXZb�S­¯/c[]_r o rwTtSZbo SZT>U o S g ]_bt|5Y�T�v�S o e&btUZ�5rL|5Y;rwY^]_S�b@u g btdf|5Tt]_eq] i

¿ WLÀ�WLÁ�W  Y­Ã�Ä¡Å¡Ã^ÆÈÇpÉLÊ"Ë�Å¡ÃzÄ~Ì�ÍfÅ~ÊGθËÐÏÑÄÒÊ ËÑÍ^ÊGÏ=Ì�Ó�Ñ|5c�b>¥zc�S o S�T®U�WfXZY�S�\1S�Y^]_TOT�U o S g ]_rw|fY�Y�UZT�eqrwSZY^]>c[Y�S°`�|5Y[Y�S�¥zc�e o rL]_U�v�S8b�S g |5Y�T@]_btc g ]�rw|5Y¤

o SZc[b�W5S�bt]�S+µ¶v s rwY^]�SZb_e g ]_rL|5Y { btrwY g r { e o S � �»± � v[|5rL]�T�S&]_bt|5c[WfSZb8v�efY[T o e { efbt]�rwS g SZY^]_b�e o S�v�c� ¨ ¬8¤Ñv�|5Y g o e�v[rwTt]_efY g S1Ttc�rLWqefY^] o s e~µ[S

zS�Yz]�b�S o SV�»±ÔS�] o S g SZY^]_btSVv�c�v�U�]�S g ]�SZc�b �

z Õ�^� v[|5rL]�Ö�]�b�S�rLY h UZbtrwS�c�b�S­¯ �5�/g \ i R0S��»±×v�|5r�]�U��^e o SZ\/SZY^]OÖ�]_btS�efTtT�| g rwUª¯Veqcº\1|frwY�T>]_bt|5rwT]_b_e g SZT i

�5�

Page 101: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

¿�Ø À Ø Á Ø À Ì ÓGÃ�ÍfÅ¡Ä~Î�ËÑÙee

R0S g efT&|5Ú o SZT&v�S�clµÛU o S g ]_bt|5Y�T&Tt|5Y^]7b�S g |5Y�T@]_b�c[rL]_T�v�efY�T o S g e o |5b�rL\1X+]_b�S/SZT@]7Y�|f]�Uee iR-SZT7U o S g ]�b�|5Y[T/Tt|5Y^]VTtU o S g ]�rw|5Y[Y�UZT/¯ o s efrwv�SVv�c { b�| g SZTtT�S�c�bVT@]�efY�v�efb�vÜ© § o S g ]�b�|5Y ��S o S g ]�|5b@�

T�S­]_b�|fc[WqefY^]�v�efY[T o S { e g�� ef�5SªrwY h |fb�\1eq]_rL¥�c[S�© g e h ��c[]�r o ��¤�¯ { efbt]�rwbOv�SZT�T � rw\/T kq§¢¨x� rw� �[{ ]b�UZe o rLT�UZT { efb o e g | oLo ef`¸|5b_eÒ]_rw|fY i R s S�Ý g e g rL]�U°v s rLv�SZY^]�rLÞ g eq]_rL|5Y;v�SZT�v�SZclµxU o S g ]_bt|5Y�TOrwTtT�c�TOv�cZ

U�]�eqYz] { b�| g�� S�v�S �¡�5� �a¤^efc g c�Y�S�v�S�\VeqY�v�S>S+µ { o r g rL]_S�v�S>]_b�rL�5�5S�b»Y s SZTt] h efr�]_S { |5c�b��5efb�v�S�bo S/\Ve~µ[rL\&c�\ßv s U+W5XZY[SZ\/SZY^]_T i ��efY�T o s efY�e o dlTtS

ee¤ o SZT­U�W5X�Y�SZ\/SZY^]�T�T�U o S g ]_rw|fY�Y�UZT�v�|5rLWfSZY^]

eyW5|5rLb�efcº\/|5rLY�T�v[SZclµºU o S g ]�b�|5Y�T�v�|5Y^]°efcº\/|5rLY�T�c[Y¹¥�c[r»e {�{ efbt]�rwSZY^]�efc �>� i-· Y¹eav�|fY gv�SZc�µ$U g�� efY^]_r oLo |5Y[T�à[c[Y$|5Ú o S�T�v�S�clµ;U o S g ]_b�|fY�T>e {�{ efbt]�rwSZY[Y�SZY^]�efc �>� � Y[|f]_U �>� u �>� � ¤�S+]c�Y�efcl]_b�S1|5Ú o s c�Y�v�SZT&U o S g ]_bt|5Y�T�e {�{ efb@]_rwS�Y^]�efc �>� S+] o s efc[]�b�SVefc § � � Y�|f]�U �>� u § � ��iR-S g efT�|5Ú o SZT�v�SZc�µáU o S g ]_bt|5Y�T�e {�{ efb@]_rLSZY�Y�S�Y^]8efc § � � Y�|f]_U § � u § � � Y s SZT@] { efT { b�rLT�SªSZYg |5\ { ]�Sf¤ g efb o s S�Ý g e g rL]�U�v�cºTtrw�5Y�e o v�efY�T g S�]�U g�� efY^]_r owo |5YáS�Tt] { b�eq]_rL¥zc�SZ\/SZY^] �y�1h |5rwT { o c�T{ S+]_r�]_S8¥zc�S g S owo S8v[SZT�v�SZc�µ�efc[]_btSZT g |fY[Þ��5c�b�eq]_rL|5Y�T �>� u �>� S�] �>� u § � i�=|5c[b�eyW5|frwb o S�\1eÒµlrw\&c�\âv�SOT�rw�fY�e o ]_|fc[]�SZYV\1eqãL]_b�rLT_efY^] o SO`[b�c�r�]¢v[S h |5Y[v¤ o S�T¢U+W5XZY[SZ\/SZY^]_TT�|5Y^]>TtU o S g ]�rw|5Y[Y�UZT>eyWfS g v�SZT g |5c { c�b�S�T owä g�� S�T � R-|�|5T�S �+i R-S�T®U�WfXZY�S�\1S�Yz]�T�v[c;�Oc�Y$�t�je � v[SZT�Oc[Y�T����(` � T�|fYz]�T�U o S g ]_rL|5Y�Y�U�TOe¡WfS g o e&W5S�b�T�rL|5Y �~k � �5�~� v�S o e g |5c { c[b�SªR0|�|5TtS­Y[|f]_U�SªRf± �~k� Rf± �5�~�+i R0S�T g |5c { c�b�S�TáRf± �5� Tt|5Y^] o SZT$Ttc�rLWqefY^]�SZT � o eÜ\1e~}t|5btrL]�Uºv�SZT;Wqefb�rwef` o SZTa|5Y^]xU�]�Uv�U�Þ�Y�rwS�TOv�efY�T o S�T>T�S g ]_rL|5Y�T n[i�n ¤ ¦li�n S+] ¦lim�liL�y� à

• {T � �~¦ �°S²±Üå

• �(Tt|�æ �liL� å• §�¨xh b � �[i � ¦ å• ç ¨ µ £ æ n5¦ � �>� � ¤�S+] ç ¨ µ[�xæ kf� � § � � å• �(Tt| ç � � æ n � �>� � ¤¸S+]��(T�| ç � � æ k � § � � å• ¬Ñb �l¨ � �[i��5�[� |5c §¢¨ ç rL]�T � �[i´� � �>� � å• ∆z

� ��±�¤e � æ �&g \�¤ o e1v[rwTt]_efY g S&T�c�r�WqefY^] o s eÒµlS

zS�Y^]_b�S o s rL\ { c o Ttrw|5Y$]_b�efY�T@W5SZbtT�S7v�S

o s U o S g ]_bt|5Y;S�] o S°�»±èv�|5r�]>Ö�]�b�S°rwY h U�b�rLSZc�btS°¯ �­g \éå• ê�ê u(S o S g¡£ � �[imk � �>� � ¤�S+] ê�ê u²S o S gyn � � �[i´�z� � § � �+i

R-SZT g |5c { c[b�SZT7Rf± �~k Tt|5Y^] { b�eq]_rL¥�c[SZ\/SZY^] o SZT­\1Ö�\1S�T�¥zc�S o SZT g |5c { c[b�SZT&Rf± �5�ag rL]�UZSZT g rëuv�SZTtT�c�T�T_eqc h à^¬Ñb �l¨ � �[i�� v�efY�T o S �>� å^S+] o s e~}t|5c[]�v[S o e g |5c { c�b�S §�ìq{ æ ��i�� v�efY�T o S �>� ¤|5Ú § b�S { b�U�T�SZY^]�S o s UZY�S�b��5rLSV\/SZT�c[b�UZSVv�efY�T o S g e o |5btrw\/X�]�b�S7S�] { o s rw\ { c o Ttrw|5Y¶v�S o ex]�b_e g SefT�Tt| g rwU�S i¿�Ø À Ø Á Ø Á Ì ÓGÃ�ÍfÅ¡Ä~Î�ËÑÙ

eeicr

R0S g efT>|5Ú o s c�Y$v�SZT>v[SZclµaU o S g ]�b�|5Y�T�T�S�]_bt|5c[WfS8v�efY�T o S g e o |5btrw\/X�]_btS�S�] o s efc[]�b�S�v�efY�T o eb�U��5rw|5YVrwY^]_S�b@u g btdf|5Tt]_eq] � � � � � S�Tt]�Y�|f]�U

eeicr i � SZT>U�WfXZY�S�\1S�Y^]_TOT�|5Y^]�T�U o S g ]_rL|5Y�Y�U�T>¯ { efb@]_rLbv�SZT0Tt|5c�T@u²T � rw\/T §�¨ rwY g o c[T�rLWfSp¥�c[S�Y[|5c�TÑeyW5|5Y�T0btUye o rwT�U�T i~· Y°v�S�\VefY[v�Spv�|5Y g v�S�clµ­U o S g ]_b�|fY�Tv�|5Y^]pc�Y7¥zc�r e {�{ efbt]�rwSZY^]�efc �>� |5c/efclµ § � v�c g e o |5b�rL\1X+]_b�Sq¤qS+] o s efc[]�b�S®v�|frL]pe {[{ efbt]�SZY�rLb�¯o s � � � i R s U o S g ]_b�|fY�v�c g e o |5btrw\/X�]_btSf¤lY�|f]_U

e¤ v�|5r�]OeyW5|5rLb>v�U g o SZY g�� U o s S�Y�T�S�\&` o S8v[S­]�b�rw�f�5SZbtT

�lrwY[� o S §�¨ ¤ g S�v�S�b�Y�rLSZb=b�SZ¥zc�rLSZb@]�efc&\/|5rLY�T=c[Y&|5`�}tS+]�U o S g ]�b�|5\1ef�5Y[U�]_rL¥zc�S¢v[S {T � kf� �°S²± iR s U o S g ]_bt|5Y

ev�|5rL]¾UZ�^e o SZ\/SZY^] { efT�TtSZb o S�T g |fc { c�btSZTpRf± �¡k � Rf± �f�~� v�U+Þ�Y�rwS�T { |fc�b o S��Oc[Y����je� o SZT���c�Y�T����(` � ¤ g+hji TtS g ]�rw|5Y £li k�imn[imkli R s U o S g ]_bt|5Yºv�S o s � � �°¤ Y�|f]�U

eicr ¤¸SZT@]8T�U o S g ]_rL|5Y�U&eyWfS g�¡�5�

Page 102: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

o S { bt| g SZT�TtSZc�b/Tt]_efY�v�eqb�vÜ©j� � � § o S g ]_b�|fY �lS o S g ]_|5bj�$v�c { e g�� ef�5S;rwY h |5b�\1eq]_rL¥zc�S7© g e h ��c[]�r o � i� |5\1\/Sar o Y s dÛe { b_eÒ]_rw¥zc�S�\1S�Y^] { efT7v�S g |5c g�� SxU o S g ]�b�|5\1ef�5Y[U�]_rL¥zc�Sav�efY[T g S�]t]_S;b�U��5rw|fYv�c�v[U�]_S g ]�SZc�b�¤ o s U o S g ]_bt|5Y

eicr S�Tt]�b�S g |5Y�T@]_b�c[rL] g |5\/\/S8c�Yá|5`z}tS�]�]�efcí¤ � g�hji TtS g ]�rw|5Y �[imk5�+i � ov�|5rL] { efb g |5Y�TtUZ¥zc�S�Yz] { eqT�T�S�b o S�T g |5c { c�b�S�T�efv�U�¥�c�eq]_S�TZ¤�\/|~dfSZY�Y[SZ\/SZY^]�T�U+W5XZbtSZT � ¨ SZv�rLc�\ �T�c�r�WfeqYz]�SZT � o e&\Ve¡}t|5b�r�]_UZT>v[SZT>Wqefb�rwef` o S�T®|5Y^]OU�]�U­v[U�Þ�Y�rLSZT�v�efY[T o e&T�S g ]_rL|5Y �lim�[i��¡� à

• T�S8]_bt|5c[WfSZb�v�efY�T o e7btUZ�5rL|5Y$� � �1.1 < |ηdet| < 1.5

å• eyW5|5rLb>c�Y�S §

T � kf� �8S²±èS�]�c�Y {T � kf� �°S²±Üå

• eyW5|5rLb¢c�Y[S�]_b�e g S�efT�Tt| g rwUZSO]_S owo S�¥zc�S o S { traceT � kq� �°S²±�¤zS�]>v�|fYz] o s S+µ�]_b�e { | o eq]�rw|5Y7TtS

]_bt|5c[W5S°v�eqY�T o e�b�U��5rw|5Y$� � �îå• o e�]�b_e g S­v[|5rL]�eyWf|5rwb { bt|lv[c�rL]Oefc;\/|5rwY[T>c�Y g |5c { v�efY�T o S­� ¨ ¬¶å• o s U o S g ]�b�|5Y

eicr v[|5rL] { efT�TtSZb°c�Y�S g |5c { c�btS7v�S�b�U�T�Syeqc�v�S�Y[SZc�bt|5Y�SZT°v�S�\/|¡d5S�Y�Y�S7T�U�uW5U�b�rL]�Uf¤ ê�ê u

τ � �[i £ å• o s U o S g ]�b�|5Y

eicr btS g |fY�Tt]�b�c�r�] g |5\/\1S�c[Yx]_efc;v�S8](d { S � v�|5rL]>e¡Wf|5rwb>v[U { |5T�U­efcx\1|frwY�T�¡�^ï v�S°T�|5YxUZY�S�b��5rLS8v�efY�T o s � � �Üå

• o s U o S g ]�b�|5Yeicr rLv�SZY^]_r�Þ�U g |f\1\/S&c�Y¶]�efc¶v�S�](d { S n S�Tt] { o c[T8T�|5c[WfSZY^]ª\Ve o b�S g |5Y�Tju

]_btc�rL]�¥�c[S o s U o S g ]_bt|5Y¹rwv[SZY^]_r�Þ�U g |f\1\/S&c�Y¹]�eqc¹v�S�](d { S � |5c k ¤ g efb8r o e$efc¶\1|frwY�Tv�SZc�µ¶]_b_e g SZTªefTtT�| g rwU�SZT i � o v�|frL] { efb g |5Y�T�U�¥zc�SZY^] { eqT�T�S�bªc[Y�S g |5c { c[b�SVTtc {�{ o UZ\/SZYlu]�efrLb�S�v[S o r � S o r � |�|lv�à�R ç |�|lvlu²¬ n � �[i��~¦li � S�]�]�Sªv[SZb�Y[rwXZbtS8b�S(}tS�]�]�S { o c�T>v[S � � ï v�S�TU�WfXZY�S�\1S�Yz]�T�\&c o ]_rð}tS�]�T>eyd^efY^] { efTtT�UZT o e g |5c { c�btS ê�ê u

τ i¿íØ À Ø Á Ø�ñ ò θÙZθË=Ùaó

· Yxb�S g |5Y�T@]_btc�rL] o S°`¸|5T�|fYº½¶¯ { efbt]�rwb>v�S°T�S�T { b�|�v�c�rL]�T�v�S°v�UZTtrwY^]_U��5b_eq]�rw|5Y i R s U�]_e { S­v[So eáTtU o S g ]�rw|5Y�v�S�T7`�|5Tt|5Y�T/½ g |fY�T�rLTt]_S$v[|5Y g ¯¹T�U o S g ]_rL|5Y�Y�S�b&v�SZc�µÛU o S g ]�b�|5Y[TZ¤

ee|5c

eeicr ¤v�|5Y^] o e/\1efTtT�S­rwY^Wqefb�rwefY^]_S°T�|5r�] g |5\ { eq]�rw` o S°e¡WfS g&g S oLo S°v�c¹½¾¤ gqs S�Tt]tu(¯Òu(v[rwb�S°¥zc s S oLo S­v�|5rL]OTtS]_b�|fc[W5S�bOv�efY�T o s rwY^]_S�btWqe oLo S�v[S­\1efTtT�S g |5\ { btrwT®S�Yz]�b�S �5� �°S²±ôS+] �~¦f� �°S²± i¿íØ À Ø Á Øwõ ö Ã^Å~Ù

R-S�T­}tS�]�TVT�|fYz]ab�S g |5Y�T@]_b�c[rL]_TVeyW5S g o s e o �5|5btrL] � \1SVv�S gZ÷ Y�Sº��c�Yø�t��¤¢v�eqY�Tac�Y g�÷ Y�Sºv[Sb_eyd5|5Yø� Õ �[i ¦ ¤�S+] g |5b�btrw�5U�T1v[S o s U g�� S owo S;v s U�Y�SZbt�5rwSxv�S�T°}tS�]�T � « § � � ¤ � g+hji TtS g ]�rw|5Y n[i´�^�+i� c¶\1|frwY�T�v�SZclµ�©j`¸|5Y�T@��}tS�]�T8T�|5Y^]°v�S�\VeqY�v�UZT°v�eqY�T g�� ef¥zc�S7U�WfXZY�S�\1S�Y^]y¤0b�U { |5Y[v�efY^]­efclµg b�r�]_X�b�SZT�Ttc�rLWqefY^]_T°à

• o S { btSZ\/rwS�b � TtS g |fY�v � }tS�] o S { o c�T�UZY[SZb��fU�]_rL¥zc�S°v�|5rL]OeyWf|5rwb>c�Y { jet1T � kf� �°S²±� { jet2

T � �~¦ �8S²± � e { b�XZT g |5b�btS g ]�rw|5Y8å• T�S8]_bt|5c[WfSZb�v�efY�T o e7btUZ�5rL|5Y |ηdet| < 2.5

å• g�� ef¥zc�S®}tS�]�v�|frL]�Ö�]�b�S°v�rLTt]�eqYz]�v[SZTOv�SZclµ$U o S g ]�b�|5Y�T�v�S

∆R � �[i ¦ ¤ g�h¾§ ¥ i¸n[i�� å• Ö�]�b�S/efT�Tt| g rwU7¯;efcî\1|frwY�T�v[SZclµ¶]�b_e g SZT°rwTtT�c�S�T­v[cîWfSZbt]�S+µ { btrw\1efrwbtS � ±pSZbt]�S+µ � |5Y[Þ�b@u

\1S�v «fS�]�T ��i � S+]�]_S g |5Y[v�rL]�rw|5YxY s SZTt]�v�SZ\1efY�v[UZS�¥zc�S { |fc�b o SZT�U�W5X�Y�SZ\/SZY^]�T�v�SZT��Oc�Y[T���(` i � � efc[]�S o c�\/rwY[|5T�r�]_Uf¤ o S�Y�|5\&`[b�S8v s rwY^]_S�b_e g ]_rL|5Y�T>efc[�5\1S�Y^]_S8S�] g S�]t]_S g |fY�v�rL]�rw|5YT�c {[{ b�rL\1S7v�S�T�}tS�]�Tª¥zc�r�Y s e {�{ eqbt]_rLSZY�Y[SZY^] { efT�¯ o s rwY^]_S�b_e g ]_rL|5Y¶|5Ú o SZT o S { ]_|5Y[TªTt|5Y^]rwTtT�c�T i

�y�[�

Page 103: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

)/ù@ú ûîü�ýÿþ������;ü�� ü����Ñý ý�� �� �þ�ý�=|5c�b®e¡Wf|5rwb¢c�Y$\/|lv�X o S { S�b�\/S�]t]�efY^]®v[S�v�U g b�rLb�S o SZT�v[|5Y�Y�U�SZTZ¤[|5Y$T�rL\&c o S o S�T { bt| g SZTtT�c�T

v�cá� ¨ eyd5efY^] o S8\1Ö�\1S8U+]�eq]�Þ�Y�e o ¥�c[S­Y[|f]_btS­Ttrw�5Y�e o i � S�T { b�| g SZTtT�c�TOT�|fYz]�e {�{ S o UZT>`�btc�rL]�Tv�S h |5Y�v1� ¨îi �pc[rwT�|5Y g |f\ { eqb�S o e�T�|5\/\1S�v�S o SZc[b g |5Y^]�b�rw`[c[]_rL|5Y7efclµ7v[|5Y�Y�U�SZT i�· Y7T�rL\&c o SUZ�^e o SZ\/SZY^] o S/T�rL�5Y�e o

ZH i R0S/`�btc�rL]­v�S h |5Y�v�rLY�Tt]�b�c�\/SZY^]_e o SZTt]�v�U�]�SZbt\1rLY�U/¯ { efb@]_rLb­v[SZTv�|5Y�Y[UZSZT�¤ g�hji £li´��i

��Ã�Ù��=Ä��ÑÊGÅ~Ù�Ç0Ã��²Î¸ËÑÇ��� à o SZT { b�rwY g r { efclµ$`[b�c�r�]_T>v�S h |5Y�vá� ¨ v�efY�T g S�]�]�S­efY�e o dlTtST�|5Y^] o S�T>T�c�r�WqefY^]_T°à

� o SZT { b�|�v�c g ]�rw|5Y[TZ + jets

o U��5SZbtTZ¤�|5Ú o SZ

T�S�v�UZTtrwY^]_X��5b�S�S�Ye+e−

S+] o S�Tjets

o UZ�5S�b�T{ bt|¡WlrLSZY�Y[SZY^]av s c�YÈ¥�c�efb � o UZ�5S�b � c¤�v¤ g¡� |5cÐv s c�Y � o c�|5Y i � S�`�btc�rL]7v[S h |5Y[vÈS�Tt]v�|f\1rLY�efY^]OeyWfeqYz] o s U+]_rL¥�c[S�]�eq�5S8v�SZT»}tS�]�T�v�S°` i

� o SZT { b�|�v�c g ]�rw|5Y[TZ + jets

o |5c�btv�TZ¤¸¥zc�efY�v o SZ

T�S�v[UZT�rLY^]_XZ�fb�S&S�Ye+e−

S�] o SZTjetso |5c�b�v[T { b�|¡W�rwS�Y�Y�S�Yz]&v s c[Y�¥�c�efb � `Ü|5c gfi � Sa`�btc�rL]�v�S h |5Y�v�SZTt]&v�|5\/rwY�efY^]�e { btXZT

o s U+]_rw¥zc�S+]�ef�fS8v�SZT»}tS�]�TOv[S­` i� o SZT { b�|�v�c g ]�rw|5Y[T=v�rëu(`¸|5T�|fY�T

ZZ¤WW

¤~S�]WZ

¤Òe gZg |5\ { ef�5Y�U�SZT»U+W5S�Yz]�c�S oLo S�\1S�Yz] { efbv�S�T�}tS+]_T�¤�|5Ú o e&\1e~}t|5b�r�]_U�v[c�`�btc�rL]�v[S h |5Y�v { b�|¡W�rwS�Yz]Ov�S�T g efT�|5Ú;c�Yxv�SZT�`¸|5T�|fY�T�T�Sv�U�T�rLYz]�XZ�5btSªS�Y�v[SZclµ&}tS+]�v�S°`¤�S�] o s efc[]�b�S8TtS­v[UZT�rLY^]_XZ�fb�S°SZYxU o S g ]�b�|5YxS�]�Y[SZc[]�b�rwY[| i

� o SZT { b�|�v�c g ]_rL|5Y�Ttt

¤ o |5b�Tt¥�c[S o SZTtT�S�v�U�T�rwY^]�XZ�5btSZY^]�S�Y1c[Y�}tS+]pv�S�`Ve gZg |f\ { eq�5Y�U>v s c�Y

W¥zc�r-v[|5Y�Y�S°c�YxU o S g ]�b�|5Y;S+]�c[Y�Y�S�c[]_btrwY�| i

R-SZT�v[r���UZb�S�Y^]_T&`�btc�rL]�T�v�S h |5Y�vÛ� ¨ T�rw\�c o U�T�T�|fYz]�b�U�T�c�\/UZT&v�efY�T o SZTª]_ef` o Syefclµ £limk � £limnf�{ |fc�b o S°��c�Y;���je � o SZT���c�Y�T����(` ��i

��ÃxÙyÊ��¸ËÑÌ�Ó�à�U�]_efY^]>v�|5Y�Y[U�¥zc�S o eª\1efT�TtS�v�c ç rw�5�5T�Y s SZT@] { efT g |5Y�Yzc�Sq¤ o S�T�U+W5XZY[SZ\/SZY^]_Tv�SxT�rw�fY�e o

ZH|5Y^]VU+]_Ux�5UZY�U�b�U�T { |fc�b { o c�TtrwS�c�b�T/\VeqT�T�S�T g |5\ { b�rwTtSZT/SZY^]_btS �¡�f� �8S²± S+]

�~¦f� �8S²±&¤ { efb { efT�v[S ¦ �8S²± i R-SZTOU�WfXZY�S�\1S�Y^]_T�v[SªTtrw�5Y�e o T�rL\&c o U�T>T�|5Y^]Ob�U�T�c�\/UZTOv�efY[T o S]�ef` o Syeqc £li��7{ |5c�b o S�T��Oc[Y�T����je7S�]����(` i

�¡�^k

Page 104: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

��b�| g S�T�T�c[T � ¨Z

�°S²± � σ�× � � � b�S�¥^u²rwv s T ê |5\�`�b�S°v s U�WfXZY�S�\1S�Yz]�T

½� � o { S�µ g o i � �~¦ u £5¦5� n5n^£&{ ` � kl�5�~k5ìqn^ìq� ¦ � �f�½� � o { S�µ g o i � £5¦ u �¡n5�^� �¡n^k&{ ` � kl�~¦5k5ìqn^ìq�zì5¦fìf� ¤ � k5k � £fì � ì � ¤ k � � �f�� k5k � �^ì�� ¤ � kf¦5k5£5ì5k � ì5k � ìqn5�^ìfn[�½� � o { S�µ g o i � �¡n5� u k5¦f�5� �[i � � �°{ ` � kf�^£5kfìfn n5�5�f�½� � o { S�µ g o i � �~¦ u £5¦5� �5�[iL�°{ ` � kl�5�~¦5ìq�^ì5£ � � �f�� �~¦qn � ¤ � �¡¦q���~ìfn½� � o { S�µ g o i � £5¦ u �¡n5�^� �5�[i � { ` � kl�¡¦5£5ì5¦ � ì5¦ � ìf�f�^ìf�[� ¤ � � �¡�f�� k5k5£fk5ìfn^ìq�^ì5¦5ìf�½� � o { S�µ g o i � �¡n5� u k5¦f�5� �[i�n^£fn�{ ` � kf�^£Ò� � � �f�½� k o { S�µ g o i � �~¦ u £5¦5� �y�[im��{ ` � kl�5� � � � �f�½� k o { S�µ g o i � £5¦ u �¡n5�^� �y�[im��{ ` � kl�¡�5k5ìfn^ìq�^ì5¦5ìf� �5� �f�½� k o { S�µ g o i � �¡n5� u k5¦f�5� � ¦li´��h ` � kf�^£f¦ �¡�5�f�½� n o { rLY g o i � �¡¦ u £f¦5� k�i £f��{ ` � kl�5� � �¡�5�f�½� n o { rLY g o i � £f¦ u �yn5�^� nliL�~¦&{ ` � kl�¡�^£5ìq� � ìf� � ì5£f�^ì5£�� �5� �f�½� n o { rLY g o i � �yn5� u k5¦f�^� n[�5i � h ` � kf�^£q� �¡�5�f�½� k ` � � o { S+µ g o i � �~¦ u £5¦5� �[im¦q�^��{ ` � � � � k kf�5�f�½� k ` � � o { S+µ g o i � £5¦ u �¡n5�5� �[i�n � ¦&{ ` £fn � ¦fk kf�5�f�½� k ` � � o { S+µ g o i � �¡n5� u k5¦q�^� n[i´� � h ` � ¦q�z¦fk �5�¡�f�½� k ` � � o { S+µ g o i � �~¦ u £5¦5� �[i�� � k&{ ` � � � �¡k �¡�5�f�½� k ` � � o { S+µ g o i � £5¦ u �¡n5�5� �[i�� � n�{ ` £fn � ¦qn �¡�5�f�½� k ` � � o { S+µ g o i � �¡n5� u k5¦q�^� �5im£l�8h ` � ¦q�z¦f¦ �¡�f�½� k ` � k o { rwY g o i � �~¦ u £5¦5� � �5i�n&h ` � � � �¡¦ �¡�5�f�½� k ` � k o { rwY g o i � £5¦ u �¡n5�^� � £li�n&h ` £fn � ¦Ò� ¦f�f�½� k ` � k o { rwY g o i � �¡n5� u k5¦f�5� �[i � � � h ` � ¦q�z¦ � ¦f�f�½� kqg � � o { S+µ g o i � �~¦ u £5¦f� �[im� � { ` � ¦l�5�¡k kf�5�f�½� kqg � � o { S+µ g o i � £5¦ u �¡nf�^� �[i � �5��{ ` £q�5��� � kf�5�f�½� kqg � � o { S+µ g o i � �¡nf� u kf¦f�^� £li´�^n&h ` � ¦q�^�l� �¡�5�f�½� kqg � � o { S+µ g o i � �~¦ u £5¦f� �fim�f�7{ ` � ¦l�¡n5k �¡�5�f�½� kqg � � o { S+µ g o i � £5¦ u �¡nf�^� �[i´�z£ � { ` £q�5���¡¦ �~kf�f�½� kqg � � o { S+µ g o i � �¡nf� u kf¦f�^� ��im¦5£�h ` � ¦q�^�q� ¦f�f�½� kqg � k o { rwY g o i � �~¦ u £5¦5� �[i�nf�z£&{ ` � ¦l�¡n5¦ �¡�5�f�½� kqg � k o { rwY g o i � £5¦ u �¡n5�^� �[imk � � { ` £q�5���¡k ¦f�f�½� kqg � k o { rwY g o i � �¡n5� u k5¦q�^� kli � �&h ` � ¦q�^�5£ ¦f�f�

��b�| g S�T�T�c[Tσ

� × � � � b�SZ¥5u²rwv s T ê |5\&`�btS°v s U+W5X�Y�SZ\/SZY^]_Ttt (→ l+l−)

� � o { S+µ g o i �[i�n^¦5k�{ ` � �zk5£fk5ìfn^ìq�^ì5¦ £f£f�f�tt (→ l+l−)

� � o { S+µ g o i �[i��y�^n&{ ` � �^k5£f�^ì5£fì � � � �f�tt (→ l+l−)

� k o { rwY g o i �[i��^£l�8{ ` � �zk � k5ìqn k � �f�!"! rLY g o i �f�5im��{ ` n � � �5� ì � � ì � � ¤ n � � n � ìq�5�^ìq���~ìÒ�zk5ìq�^n ¤ kl�y�5�f��zk5kf� � ìf� � ìl�y�^ìl�5� ¤ £ � k��y� ¤ £ � ¦5¦fn!é½îrLY g o i nli k5¦&{ ` n � � � � ¤ �zk5k��~k ¤ £ � kl�~k ¤ £ � ¦5¦q� �5�5�f�½-½¹rwY g o i �fimn5n�{ ` n � � � k ¤ �zk5k��¡n ¤ £ � kl�¡n ¤ £ � ¦5¦5k nf�5�f�

#%$'&)( £li k � R-SZT7v�r*�íU�b�S�Yz]�T { b�| g S�T�T�c[T1v�cÛ`�btc�rL]7v[S h |5Y�vÈ� ¨ ¤ { |5c�b o S$�Oc[YÈ�t�je i σSZT@]

o e7T�S g ]_rL|5YáS+Ý g e g SªS�] � �KSZT@] o S°b�e {�{ |5bt]�v�S­`�b_efY g�� SZ\/SZY^]y¤�b�S�¥^u²rwv s TOSZTt] o S�c�bOrwv�S�Yz]�rLÞ eqYz]{ |5c[b o e&T�rL\&c o eq]_rL|5Y i �y�5n

Page 105: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

��b�| g S�T�T�c[T � ¨Z

�°S²± � σ�× � � � b�SZ¥5u²rwv s T ê |5\&`�btS8v s U+W5X�Y�SZ\/SZY^]_T

½� � o { S�µ g o i � �~¦ u £5¦5� n5n^£&{ ` £f�^k5£fn ¤�� £5k5¦fk5ìfn^ìq� ¤ � �¡¦fn �[¤ �~¦ � �f�� �¡¦q�^�^ì5k ¤ � n5�fn^¦5ì � ì �½� � o { S�µ g o i � £5¦ u �¡n5�^� �¡n^k&{ ` �5£5£l�¡n ¤ £5k5£5£fk5ìfn ¤ �¡�l�¡�f�� n5�fn^k ¤ � nf�5nf�½� � o { S�µ g o i � �¡n5� u k5¦q�^� �li � � �­{ ` � £5kf�^k5ìqn n5¦f�f�½� � o { S�µ g o i � �~¦ u £5¦5� �5�[im��{ ` £f�5k5£q� ¤[� £5k5¦5¦fìf�^ì5£ ¤ �~¦ � �f�� �~¦fn � ¤ � �~¦Ò���~ìfn½� � o { S�µ g o i � £5¦ u �¡n5�^� �5�[iL�°{ ` �^£5£l�Z� ¤ £5k5£ � k5ìfn ¦f£f�f�½� � o { S�µ g o i � �¡n5� u k5¦q�^� �limn^£q�7{ ` � £5kf�f� � � �f�½� k o { S�µ g o i � �~¦ u £5¦5� � i � ¦&{ ` £f�^k5£f¦ ¤�� £fk5¦ � ì � ¤ � �~¦Ò�5�zìf� ¦f¦f�f�½� k o { S�µ g o i � £5¦ u �¡n5�^� � i � � { ` �^£5£��~¦ ¤ £5k � �~k kf£f�f�½� k o { S�µ g o i � �¡n5� u k5¦q�^� �y�^k�h ` � £5kf�^¦ �y�5�f�½� n o { rLY g o i � �~¦ u £5¦5� k�i £5£&{ ` £f�^k5£q� ¤�� £fkf�5�^ìl� ¤ � �~¦Ò�z¦5ì5£ ¦Ò�^�f�½� n o { rLY g o i � £5¦ u �¡n5�^� nlimn5��{ ` �^£5£��¡� ¤ £5k � n^k �yn5�f�½� n o { rLY g o i � �¡n5� u k5¦f�^� n5n[i��8h ` � £5kq�5� ¤ � �f�5�~k nf�5�f�½� k ` � � o { S+µ g o i � �~¦ u £5¦f� �li ¦l� � { ` � � n^£5k �¡£f�f�½� k ` � � o { S+µ g o i � £5¦ u �¡nf�^� �li��^�l�­{ ` � � � £ � kq�5�f�½� k ` � � o { S+µ g o i � �¡nf� u kf¦f�^� n[i´�^�&h ` � �^¦5£5¦ � �f�½� k ` � � o { S+µ g o i � �~¦ u £5¦f� �li kf�5£�{ ` � � n^£5¦ � ¦q�½� k ` � � o { S+µ g o i � £5¦ u �¡nf�^� �liL�~£qn7{ ` � � � � � � nf�½� k ` � � o { S+µ g o i � �¡nf� u kf¦f�^� �5i��^£�h ` � � n^£f� �^¦q�½� k ` � k o { rwY g o i � �~¦ u £5¦5� £ � i�n&h ` � � n^£q� � kq�½� k ` � k o { rwY g o i � £5¦ u �¡n5�^� �y�^£�h ` � � � � � �f�5�½� k ` � k o { rwY g o i � �¡n5� u k5¦f�5� �[i � n � h ` � � n^£5£ �f�5�½� kqg � � o { S+µ g o i � �~¦ u £5¦f� �[im� � { ` � � � ¦l� � � �f�½� kqg � � o { S+µ g o i � £5¦ u �¡nf�^� �li � �l�­{ ` � £ � � k � � �f�½� kqg � � o { S+µ g o i � �¡nf� u k5¦f�^� £lim¦f�&h ` � �^¦f£ �[¤�� £ � � n � � �f�½� kqg � � o { S+µ g o i � �~¦ u £5¦f� �fim�5n�{ ` � £ � � ¦ ¤ � �¡¦q� � � � �f�½� kqg � � o { S+µ g o i � £5¦ u �¡nf�^� �li ¦f�f�7{ ` £l�¡� � n � �f�½� kqg � � o { S+µ g o i � �¡nf� u k5¦f�^� ��i�n5n&h ` � £ � � � ¤ � �¡¦5£5¦ � �f�½� kqg � k o { rwY g o i � �~¦ u £5¦5� �limn � k�{ ` � £ � � �[¤ � �¡¦q� � �¡£f�f�½� kqg � k o { rwY g o i � £5¦ u �¡n5�5� �li k � �7{ ` � £ � �5� ¦q�f�½� kqg � k o { rwY g o i � �¡n5� u k5¦q�^� kli��^£�h ` � £ � �5� ¤ � �¡¦5£5£ � �f�

��b�| g S�T�Ttc�Tσ

� × � � � b�S�¥5u(rwv s T ê |5\&`[b�S°v s U�W5X�Y�SZ\/SZY^]�Ttt (→ l+l−)

� � o { S�µ g o i �[imn5¦5k&{ ` � £5k �f� ¤�� £fnf�5�^ìl�~ìfk £5¦f�f�tt (→ l+l−)

� � o { S�µ g o i �[iL�Z�zk&{ ` � £fn[�¡n^ìÒ�zì5¦ �z¦f�f�tt (→ l+l−)

� k o { rLY g o i �[im�f� � { ` � £fn^k5kfìfn k � �f�!"! rwY g o i �5�5i��&{ ` � �^£5£fk5ìfn^ì � ¤�� �^£ � � £l�¡�f�!é½¹rwY g o i n[i kf¦�{ ` � �5£5£q�zì5¦fìf�^ì5£ �5n5�f�½-½ºrwY g o i �5imnfn&{ ` � �^£f£ �[¤�� �^£ � £5ì � ¦q�^�f�#%$'&)( £li�n � R-S�T8v�r���UZbtSZY^]_T { bt| g SZT�Ttc�T­v�c¶`�b�c�r�]8v�S h |5Y�v�� ¨ ¤ { |fc�b o S�T°�Oc�Y[T8���(` i σ

S�Tt]o e�T�S g ]�rw|5YºS+Ý g e g S�S�] � �KSZT@] o S­b�e {�{ |5bt]�v�S­`�b_eqY g�� SZ\/SZY^]Z¤�btSZ¥5u(rLv s TOSZT@] o SZc�bOrwv�S�Y^]_rLÞ�efY^]{ |fc�b o e&Ttrw\&c o eq]_rL|5Y i

�¡�f�

Page 106: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

��c�Y;���je�pbt| g SZTtT�c�T

σ�× � � � b�S�¥5u(rwv s T ê |5\&`�btS8v s U+W5X�Y�SZ\/SZY^]_T

ZH → l+l−bb¤ ¨

H Õ �¡�5� �8S²± �¡n[im£f�&h ` � �^£5¦5k ¤ � �^£ �5� n � �5�ZH → l+l−bb

¤ ¨H Õ �¡�^¦ �8S²± �5�5i��&h ` � �^£5¦fn ¤ � � � �5� �^�fnf�

ZH → l+l−bb¤ ¨

H Õ �5�¡� �8S²± � i��5�&h ` � �z£5¦q� ¤ � � � �[� n � �f�ZH → l+l−bb

¤ ¨H Õ �5�~¦ �8S²± £li � £�h ` � �^£5¦5¦ ¤ � � � �^k �^�f�f�

ZH → l+l−bb¤ ¨

H Õ �~kf� �8S²± �[i�n^¦�h ` � �^£5¦f� ¤ � � � �5n �^�5¦q�ZH → l+l−bb

¤ ¨H Õ �~k5¦ �8S²± ¦li��[�8h ` � �^£5¦5£ ¤ � � � �f� n �f� �

ZH → l+l−bb¤ ¨

H Õ �¡n5� �8S²± n[im£5¦�h ` � �^£5¦ �[¤ � � � �^¦ n � �f�ZH → l+l−bb

¤ ¨H Õ �¡n^¦ �8S²± klim£q��h ` � �^£5¦ � ¤ � � � �5� n � £q�

ZH → l+l−bb¤ ¨

H Õ �y�^� �8S²± �5i �5� h ` � �^£f�5� ¤ � � � �^£ n^£q�f�ZH → l+l−bb

¤ ¨H Õ �y�z¦ �8S²± �5imkfn&h ` � �^£f�[� ¤ � � � � � n � £q�

ZH → l+l−bb¤ ¨

H Õ �~¦f� �8S²± �[im£q�^�&h ` � �^£f�^k ¤ � � � � � n �f� �

�Oc�Y[TO�t�(`�pbt| g SZTtT�c�T

σ�× � � � b�S�¥5u(rwv s T ê |5\&`�btS8v s U+W5X�Y�SZ\/SZY^]_T

ZH → l+l−bb¤ ¨

H Õ �¡�5� �8S²± �¡n[im£f�&h ` � £q�^n^k ¤�� � � £5k n5� � �ZH → l+l−bb

¤ ¨H Õ �¡�^¦ �8S²± �5�5i��&h ` £q�5n[�~k ¤�� £q�^n5n k5£q�f�

ZH → l+l−bb¤ ¨

H Õ �5�¡� �8S²± � i��5�&h ` � £q�^nf� ¤�� � � £fn n5� � �ZH → l+l−bb

¤ ¨H Õ �5�~¦ �8S²± £li � £�h ` �fn^£fn5n ¤�� £q�^n^¦ k5£��y�

ZH → l+l−bb¤ ¨

H Õ �~kf� �8S²± �[i�n^¦�h ` � £q�^n5� ¤�� � � £q� n[�f�y�ZH → l+l−bb

¤ ¨H Õ �~k5¦ �8S²± ¦li��[�8h ` £q�5n[�¡n ¤�� £q�^n^£ k5£q�f�

ZH → l+l−bb¤ ¨

H Õ �¡n5� �8S²± n[im£5¦�h ` � £q�^n �[¤�� � � £5¦ n[�f�y�ZH → l+l−bb

¤ ¨H Õ �¡n^¦ �8S²± klim£q��h ` £q�5n[�y� ¤�� £q�^n � k5£��y�

ZH → l+l−bb¤ ¨

H Õ �y�^� �8S²± �5i �5� h ` � £q�5�^� ¤�� � � £f� n5� � �ZH → l+l−bb

¤ ¨H Õ �y�z¦ �8S²± �5imkfn&h ` £q�5n[�~¦ ¤�� £q�5��� k5£q�f�

ZH → l+l−bb¤ ¨

H Õ �~¦f� �8S²± �[im£q�^�&h ` � £q�5�zk ¤�� � � £5£ n5�f�f�#%$'&)( £�i�� � R0S;Ttrw�5Y�e o

ZH { |fc�b { o c�TtrwS�c�b�T�\1efT�TtSZT g |5\ { btrwT�S�T7SZY^]_btS �y�5� �°S²±�S�] �~¦q��°S²±�¤ { |fc�b o S�T��Oc�Y[T>���je � S�Y � eqc[] � S+]����(` � SZY;`�eqT �+i σS�Tt] o e&TtS g ]�rw|5Y;S+Ý g e g S°S+] � �NSZT@]

o S8b_e {�{ |fbt]�v�S°`�b�efY g�� S�\1S�Yz]Z¤�b�S�¥^u²rwv s T�SZT@] o SZc�b>rLv�SZY^]�rLÞ efY^] { |5c�b o e&Ttrw\&c o eq]�rw|5Y i

�y�^¦

Page 107: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

P,+.-�+0/ 1"23426587:98;=<>3@?BACD26E>F34AHGIA3%9JCKCL;MGONBP02CR0S�T8U�WfXZY�S�\1S�Yz]�T°v�S&T�rL�5Y�e o

ZHS+]8v�S&`�btc�rL]�T�v�S h |fY�v�!"!ô¤Q!é½¾¤í½-½�|5Y^]°U�]_U��5UZY�U�u

b�U�T�eyW5S g �)R8¬ ç � �TS � ��U ¤ c�Yá�fUZY�U�b_eq]�SZc�b�efc { b�SZ\/rwS�b>|5b�v[b�S � R · à¸R-Syefv�rLY�� · btv�SZb � v�S o e] � U�|5b�rLS8v�SZT { SZb@]_c�bt`�eq]_rL|5Y�T iR-SZT { b�| g S�T�T�c[T

Z + jetsS+]

tt|5Y^]OU�]�Uª�5U�Y�UZbtUZT�e¡WfS g � R0��� § ê S � �VU i¸§ Yácl]_r o rwT�efY^] � R0�¾u

� § ê ¤�|5Y { SZcl]1�fUZY�U�b�SZb o S�T7U�W5X�Y�SZ\/SZY^]�TVSZY { b�U g rLT_efY^] o S;Y�|5\�`�b�Sn (n = 0, 1, ...)

v�S{ efb@]_|5Y � T � ¤�¥�c[r�e gZg |f\ { eq�5Y�S o S

Z i � rwY�Ttr ¤»|fY { SZc[]1eyW5|frwb7c�Y�SxTt]_eq]_rLTt]_rL¥zc�S g |5\ { efb�ef` o S{ |fc�b®v�S�T�Wqe o SZc�btT®v�S

nv�r*�íU�b�S�Yz]�SZT i¸· Y o s rLYz]�SZb h e g S8¯��)R�¬ ç � � ¥zc�r h |5c�btY�rL] o e&\/|lv�U o rLT_eÒu

]_rL|5Y;v�S o e h b_ef�f\1S�Yz]_eq]_rL|5Y$v�S�T�¥zc�efb � T ií· Y�e {�{ o rw¥zc�S8c[Yºe o �5|5b�r�] � \/S�v[S�©(\VeÒ] g�� rLY��q� S � kWU{ |fc�b°U�W�rL]�SZb�c[Y�v�|5c[` o S g |5\ { ]_ef�5S/v�SZT { efbt]�|5Y�T­�5UZY[UZb�U�T { efb � R0��� § ê S�]�SZY�Ttc�rL]�S { efb�)R8¬ ç � � i�=|5c[b®efc��f\1S�Yz]�SZb o e°Tt]_eq]_rLTt]_rL¥zc�Sf¤ o S�T¢U g�� efY^]_r owo |fY�T

Z +nlp¤Z + bb +nlp

S+]Z + cc+nlp

¤|5Ú

nlpb�S { b�U�T�S�Yz]�S o SOY�|5\&`[b�SOv�S { eqbt]_|fY � T � o U��5SZb � T � ¤�T�|5Y^]®Ttrw\&c o UZTpTtU { efbtUZ\/SZY^] i ��S�Y�|fclu

W5SZefc¤ { |5c[bªU+Wlr�]_S�b o S/v[|5c�` o S g |5\ { ]�ef�5Sq¤ o S�TªU+W5XZY[SZ\/SZY^]_T g |5Y^]_SZY�efY^]&v�S�T�¥zc�efb � Tb

S�]c|5Y^]>U�]�U�SZY o S�WfUZT�v�S�T>U g�� efY^]�r owo |5Y�T

Z + nlpå o S�T®U�WfXZY�S�\1S�Yz]�T g |5Y^]_S�Y�efY^]Ov�SZT>¥zc�eqb � T

c|5Y^]

U�]�U­S�Y o S+W5U�T�v�S�T�U g�� efY^]�r owo |5Y�TZ + bb + nlp

S � nWU iX,+.-�+ZY [\<>5J5]A^ 98;=<>34C_?4ACK26E>F3BAHGIA3%9JCDCJ;0GON4P=2C

RÑe�T�rw\�c o eq]�rw|5Y¶Y�SVb�S { b�|�v�c�rL] { efT { efb h eqrL]_S�\1S�Y^] o SZT&v�|fY�Y�UZS�TZ¤ { efb&S�µ[S�\ { o Sf¤ o e { b�U�uT�S�Y g S&v[S�\1eq]_U�b�r eqclµ;\/|5bt]�T�\1e o g |fY�Yzc�S&v�efY[T o S­v�U+]_S g ]_S�c�b�Y s SZT@] { efTOS+µ[e g ]_SZ\/SZY^] { b�rwTtSSZY g |f\ { ]�S7v�efY�T o eaTtrw\&c o eq]�rw|5Y¤¸S�] g S o e;TtS�]_b_eqv�c�rL] { efb8v�SZT­v�U�T_e g�g |5btv�T { o c�T8|5c¶\/|5rwY[Trw\ { |fbt]�eqYz]�T�SZY^]_btS o SZT/v�|5Y�Y�U�SZT1S�] o e¹T�rw\�c o eq]�rw|5Y i R-SZT/U�W5X�Y�SZ\/SZY^]�T$T�rw\�c o U�T/Tt|5Y^]av�|fY gg |5btb�rL�5UZT i R s SZY[T�SZ\�` o SOv�SZT g |fb�b�S g ]�rw|5Y�T¢e {�{ o rw¥zc�U�SZT�¯ o e°T�rw\�c o eq]�rw|5Y�T�|5Y^]¢v�U g b�rL]�SZT�v�efY�T o S�T{ b�| g�� efrLY�T { efb�ef�5b�e {�� S�T­à` θÄ~Ä~Ã�ÍfÅ~ÊGÎ�Ë�Ç0ÃxÓ@Éba�Ë0Ã�ÄW�¸ÊGÃ$ÇÑÃ�Ùca�ÓGÃlÍfÅyÄÒθËÑÙªÇd� Í5Ì�Ó"ΠÄÒÊ.egfzÅyÄÒÃih¸RÑeªb�UZTt| o cl]_rw|fYVSZY$U�Y�SZbju�5rwS/v�S�T�U o S g ]�b�|5Y�Tªv�efY�T o SZT�U�W5X�Y�SZ\/SZY^]�T�T�rw\�c o U�T�SZT@]�\/SZr oLo S�c�b�S7¥zc�S g S owo S1v�S�T�v�|5Y�Y[UZSZT i��S { o c�T o e7b�UZTt| o cl]_rw|fYºe1U+]_U�eq\1U o rw|fb�UZS­eyW5S g c�Y�S g e o rw`�b�eq]_rL|5Y;`�efTtUZS&Ttc�b o e ç u ¨ eq]�b�r�µxS+]o s efY�� o S

φv�S o s U o S g ]�b�|5Y i R s U�Y�SZbt�5rwS�v�S�T�U o S g ]_bt|5Y�T�v�efY�T o SZTpv�|5Y�Y[UZSZT�S�] o e°Ttrw\&c o eq]�rw|5Y�e°U�]�U

g |5btb�rL�5UZS°eyW5S g eyW5S g o S { b�| g SZTtT�S�c�b�© {�� rw\/|�v � |5b�bj��v[c { e g�� ef�fS­rLY h |5bt\Veq]�rw¥zc�S�© §¢¨ b�SZTt| o c�u]_rL|5Y6j g e h S�� S � �kU i ��c�rwT o s U�Y�SZbt�5rwSªv�SZT8U o S g ]_bt|5Y�T�v[SZT8U�WfXZY�S�\1S�Y^]_T­T�rw\�c o U�T�eaU�]�U&v�U��5b_efv[UZS� �l\/Syeqb�rwY[� � eyWfS g o S { b�| g SZTtT�S�c�bV© §�¨ \ g T�\/Syeqb@�áv�c³\1Ö�\1S { e g�� ef�5SºrLY h |5b�\1eq]�rw¥zc�S i R-S�l\/SyefbtrwY��áeáU�]�UaSl��S g ]_c�U;eyW5S g c�Y�S h |fY g ]�rw|5Y�v�S � btd�T@]�e o � e owomS � ¦�U i � S+]�]_S$v[SZb�Y[rwXZbtSVS�Tt]g |5\ { |5T�U�S1v s c�Y�Sa�­eqc�T�TtrwSZY[Y�S g |5Y^W5| o c�UZSa¯xc�Y[S h |5Y g ]_rL|5Y { c�rwTtT_efY g Sf¤=S�]ªS owo S { S�b�\/S�]ªv�S\1|�v�U o rwTtSZb o SZT { bt| g SZTtT�c�TOSZY;]_S�Y�efY^] g |5\ { ]_S°v�S o e { S�bt]_S°v s UZY[SZb��frwS i` θÄ~Ä~Ã�ÍfÅ~ÊGÎ�ËèÇ0Ã:Ó@Éba�Ë0Ã�ÄW�¸ÊGà Ç0Ã�Ù\a�ÓGÃlÍfÅyÄÒθËÑÙ¹ÇÑÃøÓ@Ébn `�o h o e�\1S�T�c�btSav�S o s UZY[SZb��frwSVv[SZTU o S g ]�b�|5Y[T

eicr S�Tt];\/|5rwY[T1`¸|5Y�Y�S { efbab�e {�{ |5bt]V¯ g S owo Sáv�S�TaU o S g ]_b�|fY�Te¤®¯ g efc�TtSºv�S o e

¥zc�efT�rëujef`[T g S�Y g S�v�SZT g |5c g�� SZT®U o S g ]_bt|5\1ef�5Y�U+]_rw¥zc�S�T¢v[c g e o |5btrw\/X�]_btS>v�efY�T o s � � � i R s UZY�S�b��5rLSv�SZT

eicr eáv�|fY g U�]�U g e o g c o UZSV¯ { efb@]_rLbªv�S o s rw\ { c o Ttrw|5Yº]�b_efY[TtW5S�b�TtSxv[S o e;]_b_e g Sa¥zc�r o SZc[bSZT@]/efT�Tt| g rwUZS { trace

Ti � S�]t]_S;v�SZbtY�rwX�b�S$U+]�efY^]/\1S�r oLo SZc[b�S/v�efY�T o eºTtrw\&c o eq]�rw|5Y�¥�c[Sxv�efY�T o S�T

v�|5Y�Y[UZSZT�¤íS owo Sªe1U+]_U&v[UZ�5b�efv�UZS�eyW5S g c�Y�S h |5Y g ]_rL|5Y g |5\ { |5TtUZSªv s c[Y�S&�^efc[T�T�rLSZY�Y[S�S�]�v s c�Y�SR0efY�v�efcí¤ S � �pU S � £�U i

�¡�5�

Page 108: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

` ΠÄ~Ä~Ã�ÍfÅ~Ê"θË×Ç0à Ó@ÉëÃrq�Í5Ì�Í^ÊGÅsaøÇ�É�Ê"ÇÑÃ�Ë�Å~Êut¾Í5Ì[Å~ÊGÎ�Ë ÇÑÃ�Ùva�ÓGÃlÍfÅyÄÒθËÑÙ�Çd� Í5Ì�Ó"ΠÄÒÊwevf^Å¡Ä~Ã�ho SZT�v[r���UZb�S�Y g S�T7|5`�T�S�btWfUZSZT/v�efY[T o SZT g |5c�bt`�S�T/v s S+Ý g e g r�]_U;v s rwv�S�Y^]_rLÞ g eq]�rw|5YÜv[SZT7U o S g ]�b�|5Y[Tv�c g e o |5btrw\/X�]_btS7SZY^]_btS o S�T�v�|5Y[Y�UZS�T�S�] o e�Ttrw\&c o eq]_rL|5Y¤Tt|5Y^] g |fb�b�rL�5UZS�T&eyW5S g v�SZT h e g ]�SZc�btTv s U g�� S oLo S­¥zc�rÑ]�rwS�Y�Y�SZY^] g |5\ { ]_S­v�S g SZT�v�r���UZbtSZY g SZT i R-S h e g ]_S�c�b�� o |5`�e o v�S g |5b�btS g ]�rw|5Y�SZT@]o S { b�|�v�c�r�]Vv�S�Tav�S�clµ ]�SZbt\1S�TVT�c[rLWqefY^]_T � g�hji�g�� e { rL]_btS ¦5� à o e g |5b�btS g ]_rw|fY v�S o s S+Ý g e g rL]_Uv�SZT g btrL]_X�b�S�T�v�S { btU+u(TtU o S g ]�rw|5Yxv�S o s U o S g ]�b�|5Y { eqb_ef\/U�]�b�UZS°S�Y h |5Y g ]_rL|5Y;v�S

ηdet

¤ S�] g S owo S­v[So s S�Ý g e g rL]�U�v�S�T�U o S g ]_rL|5Y¶SZY h |5Y g ]�rw|5Y¹v[S

ηdet

S�]°v�Sφ i � SZT g |5btb�S g ]_rL|5Y�T8Tt|5Y^]�e {�{ o rL¥zc�UZS�T

U�W5X�Y�SZ\/SZY^] { efbVU�W5X�Y�SZ\/SZY^]�eyW5S g o S { bt| g SZTtT�SZc[ba© §�¨ � |5b�bj�ºv[c { e g�� ef�5S¹rLY h |5b�\1eq]�rw¥zc�S© g e h jOSV�)j�c[]�r o T@� i` ΠÄ~Ä~Ã�ÍfÅ~Ê"θË�ÇÑÃ$ÓjÉëÃrq�Í5Ì�Í^Ê ÅsaaÇpÉ�Ê Ç0Ã�Ë�Å~Êut»Í5ÌlÅ~Ê"θË�ÇÑÃ�ÙxalÓGÃ�ÍfÅ¡Ä~θË=Ù°Ç0Ã$Ó@Ébn `yo h o SZT�v�U�T_e g ug |5btv�T¾|5`[T�SZb@W5U�T�SZY^]_btS o S�T¾v�|5Y[Y�UZS�T»S�] o e�Ttrw\&c o eq]�rw|5Y°v�efY[T o S�T¾S+Ý g e g r�]_U�T»v�S�btS g |5Y�Tt]�b�c g ]_rL|5Yv�SZT¢U o S g ]�b�|5Y�T¢v�S o s � � �:|5Y^]�U�]_U g |5btb�rL�5UZT i R-S h e g ]�SZc�b�� o |f`�e o v�S g |5btb�S g ]_rL|5YVS�Tt] o S { b�|�v�c�rL]v�SZT­]_b�|frwT°]_SZbt\1S�T�Ttc�rLWqefY^]_T�¤ � g�hjiÑg�� e { r�]_btS �^� à o e g |5b�btS g ]_rw|fY�v�S o s S�Ý g e g rL]�U1v s eyW5|5rLb�c�Y[S]_b_e g SOv�efY�T o s � � �­¤ o e g |5b�btS g ]_rw|fYVv�S o s S�Ý g e g rL]�U�v s eyW5|frwbpc�YV|f`�}tS�]¢]�efc1efT�Tt| g rwU�¯ªc�Y[SO]�b_e g Sv�efY�T o s � � �­¤ S+]�S�Y[Þ�Y o e g |5b�btS g ]�rw|5Y�v�S o s S�Ý g e g rL]�Uª¥zc s c�Yº|5`z}tS�]O]�efc�v�efY�T o s � � �­¤ efTtT�| g rLU¯&c�Y�S�]_b�e g Sq¤ { eqT�T�S°c�Y[S g |5c { c�b�S8v�S8btUZTtSyefc;v�S8Y�S�c�b�|fY�SZT ê�ê u

τ i R-SZT g |5b�btS g ]�rw|5Y[T®|5Y^]�U�]�Ue {�{ o rw¥zc�UZS�T�eyW5S g o S { b�| g S�T�TtSZc�b�©j� � � � |5b�bj�8v�c { e g�� ef�fS8rwY h |5bt\VeÒ]_rw¥zc�S>©jS�\1rLv6j�Sl�'jOcl]_r o T@� i` ΠÄ~Ä~Ã�ÍfÅ~Ê"θË�Ç0ÃáÓjÉ�Ê.e�Ï)�ÑÓ ÙZÊ"θË�Å¡Ä~Ì�ËÑÙlz¸ÃzÄÒÙZÃxÇ'�_��Î�Ù�Î�Ë:óOh o e­v�rwT@]_b�rL`�c[]�rw|5Y1v�S o s rw\ { c o uT�rw|fY�]_b_eqY�TtWfSZb�TtS¢v[c­`¸|5Tt|5Yª½�S�Tt]0\1e o \/|�v�U o rwT�U�S { eqb o SZTí�5UZY�U�b_eq]�SZc�btT � R0��� § ê �8�)R8¬ ç � � ¤¥�c�efY�v o S {

T

v�cÛ½ S�Tt]�rLY h UZbtrwS�c�b�¯ �¡�5� �8S²± i¾· Y�eáv�|fY g b�S { |fY�v�UZbtU � btS+uZ{�S�rw� � ]_rLY��áS�YefY�� o efrwT � S �f� U o S {

Tv�SZT­U�WfXZY�S�\1S�Yz]�T&T�rL\&c o UZTZ¤íSZY�]�SZY�eqYz] g |f\ { ]�S7v�SZT­v�r���UZbtSZY g SZT­SZY^]_btS

o SZT�v[|5Y�Y�U�SZT�S�] o e8Ttrw\&c o eq]_rL|5Y&eqc/Y[rLW5SZefc/v�c1�fUZY�U�b_eq]�SZc�b�¤5W5|5rLb»Þ�� iz£limkli R-S�T { eqb_ef\/X�]�b�SZT�v[So e g |fb�b�S g ]�rw|5Y$c[]�r o rwT�U�T g |fb�b�S�T { |5Y�v�S�Y^]�¯ o e�W5SZbtT�rL|5Y {�kf� ��o { �5S�Y6j�YÒ}tS�] �~¦ v s � R0��� § ê ¤�¥zc�r]_b_eqrL]_S�T�U { efbtUZ\/SZY^] o S�T¾U�WfXZY�S�\1S�Y^]_T�eyW5S g�� ¤ � S+]�efc�\/|5rwY[T k }tS+]_T�¤ { |5c�b»v�S�T¸}tS�]�T�eyd^efY^]pc�Y[S§

T | �¡¦ �8S²± i � |5\1\/S o S�T8U�WfXZY�S�\1S�Yz]�TªTtrw\&c o UZT8v[SZT­�Oc[Y�T°���je$S�]°�t�(`�|5Y^]°U+]_U7�5UZY[UZb�U�Te¡WfS g o ea\/ÖZ\/S&W5S�b�T�rL|5Y¶S�] o S�T8\1Ö�\1S�T { efb�ef\1X+]_btSZT°v s � R0��� § ê ¤ o SZT8\/ÖZ\/SZT g |5b�btS g ]�rw|5Y[To SZc[b�T°|5Y^]­U�]_U1e {�{ o rw¥zc�U�SZT i R-S�T g |5b�btS g ]�rw|5Y[T­|fYz]ªU�]�U1SV�íS g ]�c�UZS�T&eyW5S g o S { b�| g SZTtT�S�c�b°©@½�»u]���Sl{¢SZrw� � ]�rwY��Ò��v�c { e g�� ef�fS­rLY h |5bt\Veq]�rw¥zc�SO© g e h j�\ g j�c[]�r o � i` ΠÄ~Ä~Ã�ÍfÅ~Ê"θËèÇÑÃøÓ@Éba�ËÑÃzÄW�¸Ê"ÃÈÇ0ÃlÙ~}ZÃ^Å~ÙDh o eábtUZT�| o c[]�rw|5YÜS�Y�UZY�S�b��5rLSav�S�T�}tS�]_T�v[SZT�U�WfXZY�S�u\1S�Yz]�T1Ttrw\&c o UZT/U�]_efY^]V\/SZr owo SZc�btS$¥�c[S g S owo S�v�S�TVv�|fY�Y�UZS�TZ¤¢S owo Sxe�U�]�U g |5b�btrw�5U�SáeyWfS g c�Y[S]_S g�� Y�rw¥zc�S­e {�{ S o UZS­«^���l� � { |5c�bO«fS�]�T��l\1SZefb�rLY���¤�� � r h ]�rwY��&efY�vx�OS�\1|¡W�rwY[� � S � � U S´� �pU ¤�v�U�uW5S o | { UZSpv�efY�T o e g | owo ef`�|fb_eq]�rw|5Y����øeqÞ�Y­v s e~}tc�Tt]�SZb o S�c�b0UZY�S�b��5rLS¢¯ g S owo Spv�SZTÑv�|5Y�Y[UZSZT i � S�]�]�S]_S g�� Y�rw¥zc�S�SZTt]¢`�efTtUZS�T�c�b o S�v�U�T�UZ¥zc�r o rL`�b�Sq¤^Y�|f]_U

∆S¤�S�YVrL\ { c o T�rL|5Y&]_b�efY�T@W5SZbtT�S�S�Y^]_b�S o S¾}tS+]

S�] o S�`¸|5Tt|5Y¤zv�efY�T�v�SZT¢U�W5X�Y�SZ\/SZY^]�Tγ + jet

|5cZ + jet

¤�v�SZT�v�|5Y�Y�U�SZT®btUZS owo S�T¢S+]®Ttrw\&c o UZS�TZ¤v�efY�T o S�T�¥zc�S o T o S8`¸|5T�|5YxS�] o S¢}tS�]Ov�|5r�W5SZY^]OÖ�]�b�S­v�|5Tjuj¯Òu²v�|5T i RÑe�Wqefb�rwef` o S

∆ST s S+µ { btrw\/S­v[S

o e&\1efY�rwX�b�S8Ttc�rLWqefY^]_S�à

∆S =pjet

T − pγ/ZT

pγ/ZT

.� £�iL�~�

RÑe g |5\ { efb�efrwTt|5Y7v�S∆S

S�Yz]�b�S o SZT�v�|5Y[Y�UZS�T®b�U�S owo SZT�S�]¢T�rL\&c o U�SZT�SZT@] { eqb_ef\/U�]�b�UZS { efb o s rw\�u{ c o Ttrw|5Y¶]_b�efY�T@W5SZbtT�S1v�cÜ`¸|5T�|5Yí¤Ñ¥zc�rpS�Tt]&\/SZr owo SZc�btS&¥zc�S g S owo S7v�c;}tS+]_TZ¤ { c�rLT�e¡}tc�Tt]�UZS { |5c�be¡Wf|5rwb o SZT { efb_ef\/X�]�b�S�T¢v�S o e g |fb�b�S g ]�rw|5Y i R-SZT-}tS�]�T�T�rL\&c o UZT�eyd^efY^]®c[Y�S�\/SZr owo S�c�b�S>btUZTt| o c[]�rw|5Y¥�c[S g S owo S­v�S�T�v�|5Y�Y[UZSZT�¤ g S�]�]�S&| { UZb�eq]_rL|5YxWqeVv[UZ�5b�efv�SZb � �l\/Syeqb�rwY[� � S�]�v[U g e o SZb � � � r h ]_rLY�� �

�y�^£

Page 109: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

o s rw\ { c o T�rw|fY1v�S�T¾}tS�]_T�Ttrw\&c o UZT�¤[¥zc�r-T�S�b_e/e o |fb�T { bt| g�� S8v�S g S oLo S�v[SZT¾}tS�]�TOv[SZT�v�|5Y�Y[UZSZT�¤�W5|5rLbÞ�� i®£limnli R-SZTª}tS+]_T$T�rL\&c o UZTaeyd5efY^];c�Y {

T

æ �~¦ �8S²± TtSZb�|fYz];btSj}tS+]_UZT � �OS�\1|¡W�rwY�� �+i � SZTg |5btb�S g ]_rL|5Y�T>|5Y^]�U+]_U­e {�{ o rw¥zc�U�SZTOeyW5S g o S { b�| g S�T�T�S�c�b®©t«fS�]����[�®�8v�c { e g�� ef�fS8rwY h |5bt\VeÒ]_rw¥zc�S© g e h j�\ g jOcl]_r o � i` θÄ~Ä~Ã�ÍfÅ~ÊGÎ�ËéÃlË

ηÃ^Å

∆RÇ0Ã�Ù�}ZÃ^Å~Ù\h»SZY��5UZY[UZb_e o ¤ o S�T°v�rwT@]_b�rL`�c[]�rw|5Y�T8S�Y

ηS+]

∆Rv�SZT

}tS�]�T­Y[S1Tt|5Y^] { eqTª`�rLSZYîb�S { b�|�v�c�r�]_SZT { efb o e;Ttrw\&c o eq]�rw|5Y¹v�eqY�T o SZT°U g�� efY^]_r oLo |5Y[TZ + jets i� SZT8Wqefb�rwef` o SZT�|fYz]°v[|5Y g U�]�U g |5btb�rw�fUZSZT°eqcîY[rLW5SZefc¶v�c¶�5UZY[UZb_eÒ]_SZc[bZ¤0eyW5S g v[SZT h e g ]�SZc�btT°v�S

g |5btb�S g ]_rL|5Y�T�v�U�]�SZbt\1rLY�UZT { efb o e g | owo ef`�|fb_eq]�rw|5Y i R-SZT g |5b�btS g ]_rw|fY�T�|5Y^]�U�]_U g e o g c o UZSZT¢T�c g�g S�T@uT�r�W5SZ\/SZY^]�eyW5S g c[YVe~}tc[Tt]_S�\1S�Y^]¢v[S o e�v�rLTt]_btrw`�cl]_rw|fY�v�SZTpb_e {�{ |fbt]_T�S�Y^]_b�S o SZT�v�|5Y[Y�UZS�T¢btUZS oLo S�TS�]�Ttrw\&c o UZS�T { |5c[b

ηdetS�]

∆R¤�b�S�T { S g ]_rLWfSZ\/SZY^]�eyW5S g c�Y[S h |fY g ]�rw|5Y { | o d�Y�|f\1rwe o SOv�c;¥zc�eÒu

]_btrwXZ\/S®S+]¢v[c/]�b�|5rLT�rwX�\1S¢|5b�v[b�S S�� ��U ¤qW5|5rLb»Þ�� i�£li´�[i � S�T g |5b�btS g ]�rw|5Y[T�|5Y^]¢U+]_UOe {�{ o rw¥zc�U�SZT�efclµU g�� eqYz]�r oLo |5Y�T

Z + nlp¤Z + bb + nlp

¤�S+]Z + cc + nlp i

` θÄ~Ä~Ã�ÍfÅ~ÊGÎ�Ë Ì�ÙyÙZÎÍ^ÊwazÃ��âÓGÌ Í5θËt¾Ä�e�Ì[Å¡Ê"θËÔÇ0Ã�z¸ÃzÄ¡Å¡Ã^Æ�h o s S�Ý g e g r�]_U¹efTtT�| g rLUZS¹¯ o eg |5YlÞ�b�\1eq]_rL|5Y;v�S°W5SZb@]_S�µºS�Tt]�v[r���UZb�S�Y^]_S�S�Y^]_b�S o S�TOv[|5Y�Y�U�SZT�S+] o e/Ttrw\&c o eq]_rL|5Y i RÑe g | oLo ef`¸|qub_eq]�rw|5Y/e°v�|5Y gOg S�bt]�rLÞ�UOv�SZT h e g ]�SZc�btT¢v[S g |fb�b�S g ]�rw|5Y { |fc�b g S�]t]_S g |5c { c�b�S S�� k�U i R-SZT h e g ]_SZc[b�Tv�S g |5btb�S g ]_rL|5Yî|5Y^]�U+]_U g e o g c o UZT­¯ { efbt]�rwb8v�S�T�U g�� efY^]_r oLo |5Y[T

γ + jetsS�]

Z + jets¤0S�]ªr o T

|5Y^]®U+]_U { eqb_ef\/U�]�b�UZT¢SZY h |fY g ]�rw|5Y1v�S o e { |fT�rL]�rw|5Y/v�caWfSZbt]�S+µ { b�rL\Veqrwb�S { eqb�b_e {�{ |fbt]>¯ o s eÒµlSz¤�v�S o e { T�S�c�v�|qu²b_e { rwv�r�]_U�S+]�v�S o s rw\ { c o T�rL|5Y1]�b_efY�T@W5S�b�T�S°v�c�}tS+] i � S+]�]_S g |5b�btS g ]�rw|5Y$Y s e�U�]�U

e {�{ o rw¥zc�U�S8¥�c s efc�µ;U�WfXZY�S�\1S�Yz]�T�Ttrw\&c o UZT>v�S�T���c�Y�T��t�(` i` θÄ~Ä~Ã�ÍfÅ~ÊGÎ�Ë Ç0ÃKÓ"ÌèÙZÃ�ÍfÅ~ÊGθËÔÃrq�Í5Ì�Í5Ã�h�S�Y:�5UZY�U�b_e o ¤ o e�T�S g ]�rw|5Y:S+Ý g e g S¹v[S { b�|�v�c g u]_rL|5Y�v�SZT�U�WfXZY�S�\1S�Y^]_T�Ttrw\&c o UZT�S�Tt] g e o g c o UZS�efc { btSZ\/rwSZb�|fb�v�btS � R ·­� eyWfS g o SZTp�5U�Y�UZb�eq]_S�c�b�T i�=|5c[b { btUZv�rLb�S o SVY[|5\&`�btS/]�|f]�e o v s U�WfXZY�S�\1S�Y^]_T/efclµ�|5btv�b�S�T { o c�T�U o S�WfUZT�¤ o S�T�U+W5XZY[SZ\/SZY^]_TT�|5Y^] { |5Y�v�U�b�UZT�eyW5S g c�Y h e g ]�SZc�b°v�r�] � u h e g ]�SZc�b°S�]­Y�|q]_U �zhji R-S �^h v s c�Y { b�| g SZTtT�c�TªSZT@] o Sb_e {[{ |5b@]OSZY^]_btS�T_e1T�S g ]_rL|5YáS+Ý g e g S g e o g c o UZS­efclµ�|5btv�b�S�T�T�c { U�b�rwS�c�b�T�¤¸](d { rL¥zc�SZ\/SZY^]8eqcáT�S�ug |5Y[v � ê R ·°� |5c�efcî]_bt|5rwTtrwXZ\/S � ê�ê R ·°� |5btv�b�S/v�S o ex] � UZ|5btrwS/v�SZT { S�bt]_c[b�`�eq]�rw|5Y[TZ¤0S�]�T_eT�S g ]_rL|5Y;S�Ý g e g S g e o g c o UZS°¯ o s |5b�v[b�S°R · � �^h Õ ê � ê � R ·âì R ·°� S´� npU i− RÑe�T�S g ]_rL|5YøS�Ý g e g S¹v�S { b�|�v�c g ]_rw|fY v�S�T { b�| g S�T�Ttc�T

Z + jetso UZ�5S�b�TVe�U�]�U g e o g c o UZS

eyW5S g � R0��� § ê ¯ o s |5b�v�btS�v�SZT o |5�5efb�r�] � \/SZT»v[|5\1rLY�efY^]_T � R0R�à�R0SZefv�rLY��­R0|f� � v�S o e8] � U�|5b�rLSv�SZT { SZb@]_c�bt`�eq]�rw|5Y�T�¤ { c�rLT>Y�|5bt\Ve o rwTtUZS�¯ o s |5btv�b�S ê�ê R ·&i � |5\/\/S g S h e g ]_SZc[b>v s U g�� S oLo S8Y s e{ efT8U+]_U g e o g c o U7¯ { efbt]�rwb�v[S o eaT�S g ]_rL|5Y¶S�Ý g e g S1¯ o s |fb�v�btS7R · ¤r o SZT@]ªe {�{ S o U �^h�sLi R0S �^h�sWqefc[]OefrLY�T�r �fimn5� S+]�r o e7U�]�Uªe {�{ o rL¥zc�U°¯&]_|5c�T o SZT { bt| g SZT�Ttc�T

Z + jetso U��5SZbtT i

− R-S �^h � ê R ·°ì R ·°� e8U�]_U g e o g c o U { |5c�b o SZT�T�eyW5SZc[b�T o |5c�btv�SZTZ +bb

S�]Z +cc

¤5S�] { |5c�b o SZT{ b�| g S�T�Ttc�T

Z + jetso UZ�fSZb�T®e¡WfS gª¨ �®� ¨ S�� �kU ¤lc�Y;�5UZY[UZb_eÒ]_SZc[b>v�|5Y^] o S�T g e o g c o T�Tt|5Y^] h efrL]�Tefc$v�S�clµlrwXZ\/S8|5btv�b�S�v[S o eª] � UZ|5btrwS�v[SZT { S�bt]�c�b�`�eÒ]_rw|fY�T i[§ Y[T�c�r�]_Sf¤ ¨ �®� ¨ e&v�U�]�SZbt\1rLY�U o S�T

h e g ]�SZc�btTpv�S g |5b�btS g ]_rw|fYVefTtT�| g rLUZT�¯ o e8T�S g ]_rL|5Y1S+Ý g e g S�v�S { bt|lv�c g ]_rL|5Y7v�SZT�T_eyWfSZc�btT o |fc�b�v�S�T� Y�|q]_U ç � � ¤=SZY h efrwT�efY^] o Sab_e {[{ |5b@]�v�c �^h v�S g�� ef¥zc�S$T�e¡WfSZc�b o |5c�b�v[S { efb o S �^h v�SZT�}tS�]�To U��5SZbtT/à ç � Õ �^h � Z + bb ì cc �°ìx�^h � Z + nlp ��i � rwY[T�r ¤ o e$T�S g ]_rL|5Y�S+Ý g e g SVv�SZT { b�| g S�T�Ttc�TZ + jets

o |5c[b�v�T��fUZY�U�b�UZS { efb � R0��� § ê S�Tt] g |5b�btrw�5U�S&eyW5S g/g S h e g ]�SZc�b�T�c {�{ o UZ\/SZY^]_efrwbtS iR0e g |5b�btS g ]_rw|fY;]�|f]�e o S { |5c�b g SZT { b�| g S�T�T�c[T�Wqefc[]�v�|fY g à�^hZs�� ç �

bb Õ �5imnf���1�5im¦5k Õ �fi � � ¤ { |fc�b o S�TZ + bb + nlp

�¡� �

Page 110: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

�zh�sQ� ç �cc Õ �5i�n5���1�5i��^£ Õ kli��~¦ ¤ { |5c�b o SZT

Z + cc + nlp i− R0eÛTtS g ]_rw|fYéS+Ý g e g Sîv�S { bt|lv�c g ]_rL|5Y:v�S�T { bt| g SZTtT�c�T

ttS�]xv�S�T;v�r�u²`�|5Tt|5Y�T$S�Tt]�UZ�^e o S+u

\1S�Yz] g |5b�btrw�5U�SªeyWfS g c�Y �^h � ê R ·°ì R ·­��i R-SZTOT�S g ]_rL|5Y�TOS�Ý g e g SZT�R · � btSZT {íi ê R ·­� |5Y^]�U�]�Ug e o g c o UZSZT�eyW5S g �:R�¬ ç � � S+] � RÑ��� § ê � btSZT {i�¨ �®� ¨º�+i R0S�T �^h Wqe o S�Y^] �5i��5nª{ |5c�b o S�T>½-½¾¤�5im�f�7{ |5c�b o SZT�!é½¾¤ �5i��[�°{ |5c�b o S�T�!"!ô¤�S�] �5i´�^n�{ |fc�b o S�T

tt i− R0eºT�S g ]�rw|5Y�S+Ý g e g S;v�S { b�|�v�c g ]�rw|5Y�v�c�T�rL�5Y�e o

ZHeºU�]�U g |5btb�rL�5UZS g |5\/\1S g |5Y�TtSZr owo U

SZY S´� ¦�U i � SZT g |5b�btS g ]_rw|fY�T�]_rLSZY�Y[SZY^] g |f\ { ]�S�v�S�T g |5btb�S g ]_rL|5Y�T®U o S g ]_bt|qu h efrL` o S�T { efb�S�µ[S�\ { o S i` ΠÄ~Ä~Ã�ÍfÅ~Ê"Î¸Ë ÇÑÃ�ÙÛÏ=Ì[ÄÒÌ]evf^Å¡Ä~ÃlÙÐÇpÉ����>������� h�e { btXZT o SZT g |5btb�S g ]_rL|5Y�T$e {[{ o rL¥�c[UZSZTa¯ηdet

S�]∆R

v�S�T>}tS+]_T°T�rL\&c o UZT�¤|5Yî|5`�T�S�btWfSVSZY g |5btS/v[SZT­v�UZT�e gZg |5b�v�TªSZY^]_btS o SZT°v�|fY�Y�UZS�TªS+]o e7T�rw\�c o eq]�rw|5Y i � SZT�v[r���UZb�S�Y g S�T { bt|~W�rLSZY�Y�S�Y^]8v�SZT { efb_eq\1X+]_b�S�T�v s � R0��� § ê c[]_r o rLT�UZTOv�efY[To e�Ttrw\&c o eq]_rL|5Y g |5\/\1S o SZT h e g ]_S�c�b�T>v�S8btSZY�|fb�\1e o rLT_eq]�rw|5Y¤ o eªWqefb�rwef` o S�c[]_r o rLT�UZS { |5c[b®v�U�]�SZbju\1rLY�SZb o e°Wfe o SZc[b�v�S o e g |5Y�T@]�efY^]_S8v[S g |5c { o ef�fS�¯ g�� ef¥zc�S�W5S�bt]_S�µ�¤�|5caS�Y g |5btS o S�T�v�r*�íU�b�SZY^]�T{ efb_eq\1X+]_b�S�T�TtSZb@WfeqYz]�efc�\Veq] g�� rwY[� i � SZT { efb_eq\1X+]_b�S�T�v s � RÑ��� § ê |5Y^]�v�|5Y g U�]�U g |fb�b�rL�5UZTg |5\/\1S�v�U g b�rL]OS�Y S´� �lU i` ΠÄ~Ä~Ã�ÍfÅ~Ê"θËøÇd�³Ï=Ä~Î�t»Ó�Ç0öÓ"Ì�Ó.�deÜÊ"ËÑθÙyÊ ÅsaáÊ ËÑÙ�Å¡Ì�˸šÌ�ËHa�ÃDh o S { b�|fÞ o v�S o e o c�\/rwY[|5T�r�]_UrwY�T@]�efY^]�eqY�UZS/v�SZTªU�WfXZY�S�\1S�Yz]�T&v�S/`�r eqrwT°\1rLY�rw\�c�\ � g�hji=klimkli´�z� v�efY�T o e$T�rL\&c o eÒ]_rw|fY¤íY s SZT@]{ efT�rLv�SZY^]�rw¥zc�S&¯ g S o c�rÑv�SZT�v�|5Y�Y�U�SZT i R-SZT�U�W5X�Y�SZ\/SZY^]�T­Ttrw\&c o UZTO|5Y^]�v�|5Y g U+]_Uªb�S { |5Y�v[UZb�U�Te¡WfS g o S { b�| g S�T�TtSZc�b¾©@R-c�\/r ��Sl!�SZrL� � ]_rLY��q�pv�c { e g�� ef�5S>rwY h |5b�\1eq]_rL¥zc�S�© o c�\/rZj { bt|fÞ o SZT@� S�� �WU ¤W5|5rLb®Þ�� i £lim¦li` ΠÄ~Ä~Ã�ÍfÅ~Ê"θËKÇd��z¸ÃzÄ¡Å¡Ã^ÆôÇ�É�Ê"Ë�Å¡ÃzÄ~Ì�ÍfÅ~ÊGÎ¸Ë Ï=ÄÒÊ"Ë=Í^ÊGÏ=Ì�Óch�v[c�b_efY^]ªc�YÜT@]_|5btSf¤ o e h |5b�\/S7v�c{ |5rLY^]-v�S g | oLo rLT�rw|fY g�� efY[�5SpS�]Ñv�S�W�rLSZY^] { o c�T o efb��fS�¯ o e�Þ�Y­v�c­Tt]_|fb�Sf¤y¯ g efc�TtS¢v�S o e g b�|frwT�T�efY g Sv�S o s UZ\/rL]t]�efY g S7v�SZT h efrwT g Syeqclµ i R0eáv�rLTt]_btrw`�cl]_rw|fY�v�cÜWfSZb@]_S+µÜv s rwY^]_S�b_e g ]_rw|fY { btrwY g r { e o v�S�TU�W5X�Y�SZ\/SZY^]�T�T�rw\�c o U�TÑS�Tt]¾\1|�v�U o rwTtUZS�eyW5S g c�Y�S h |fY g ]�rw|5Y&�­efc[T�T�rLSZY�Y[S�v�S o efbt�5SZc�b g |5Y�Tt]_efY^]_Sq¤\VefrLT g S�]t]_S h |5Y g ]_rL|5Y&Y s SZT@] { efTpefv�U�¥zc�eq]_S i � rLY�T�r ¤ o S¢WfSZbt]�S+µ7v s rLYz]�SZb�e g ]�rw|5Y { b�rwY g r { e o v[c�`�|quT�|5Y�½Ûv[SZT­U�W5X�Y�SZ\/SZY^]�T�T�rL\&c o UZT8SZT@]�btS { |5Y�v�U�b�U/eyW5S g o S { b�| g SZTtT�S�c�b8© � Syeq\4!�S�rw� � ]_�pbt| g �v�c { e g�� ef�5S°rwY h |fb�\1eq]_rL¥�c[S�©j`¸Syeq\ { |5T�r�]_rL|5Yl� S´� £�U ¤[W5|5rLb®Þ�� i¸£li��` ΠÄ~Ä~Ã�ÍfÅ~Ê"θËÜÇd��Å¡ÄÒÊw� � ÃzÄ���� h v�efY[T o s efY�e o d�T�S

eeicr ¤ o s U o S g ]�b�|5Ye

v�|5r�]�eyWf|5rwb¢v�U g o SZY g�� Uo s SZY�TtSZ\&` o S�v�SO]�b�rL�5�5SZbtT��lrwY[� o S §�¨�i R s SV�íS+]¢v[S g S�]¢SZY�TtSZ\&` o S�v[SO]�b�rw�f�5SZbtT¢e°U�]�U�v[U�]_S�b�\/rwY�Uv�efY�T o eaT�U o S g ]_rw|fYîv[SZT°v�|5Y�Y[UZSZT�¤-S�]­r o e$U�]_U { b�rwT8S�Y g |5\ { ]_S o |5b�T�v�S o eaT�rL\&c o eq]_rL|5YºeyW5S go SZT { b�| g S�T�T�S�c�b�T�© g e h ¬Ñb�rL�5�5SZb § Ý g rwS�Y g d^��¤5©@��bt|5`�ef`�r o r�](d�j�Y §�¨ �OS+]�© g e h ¬=btrw�5�fSZb · c[] { c[]@�Ov�c{ e g�� ef�5S°rwY h |5b�\1eq]_rL¥zc�S�© g e h j>]_btrw�5�fSZb@� S´� � U i

� ù�� � þ��0ü��)� l�����HV��� ��� ���)��V�T�;ü�������� � �� ��H��íü��R-S�`�btc�rL]�v�S h |5Y�v¶\&c o ]_r }tS+] � |5c�� � � � v�efY�T g S�]�]�S/efY�e o dlTtSf¤ g |5b�btSZT { |5Y[v�efc�µ¹U�WfXZY�S�u

\1S�Yz]�T�eyd5efY^]�c�Y�|5c { o c�TtrwSZc[b�T�}tS�]�Tª\1e o rwv[SZY^]_r�Þ�UZT g |f\1\/S7c�Y�U o S g ]_bt|5Ye

v�efY�T o S g e o |qub�rw\/X�]�b�Sq¤=|5c g |5\/\1S1c�Y�U o S g ]�b�|5Yeicr v�efY�T o s � � �°¤ � |5YÜv�r�]�UZ�5e o S�\1S�Yz] h e � S e

¤=|5c h e � Seicr �+i � S+]�]�S1\1efc[WqefrLT�S�rwv[SZY^]_r�Þ g eq]�rw|5Y¹S�Tt] o rLUZS7efclµ¹rw\ { S�b h S g ]_rL|5Y�T8v�cîv�U�]�S g ]_SZc[bZ¤ÑS�]ªefclµv�rLWfSZb�T g |5c { c[b�SZT°v�S�TtU o S g ]�rw|5Y¹¥zc�r�Y s |5Y^] { eqT8c�Y�S�S�Ý g e g r�]_U�Y�|5Y¶Yzc oLo S { |5c�b o S&`�btc�rL]8v[S

�y� �

Page 111: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

�% u¡¢( £limk � �Oe {�{ |5bt]�SZY^]_btS o SZT�v�|5Y�Y�U�SZT8S+] o eVTtrw\&c o eq]�rw|5Y;v�S o s rL\ { c o T�rL|5Y$]_b�efY�TtWfSZbtT�S7v�c`�|fT�|5Y�½ i

h |5Y�v¤ g S�¥�c[r»SZT@]8rwY�U+W�rL]�eq` o S­T�r=|5YáW5S�c[]°�^efbtv�SZb�c�Y�S&S+Ý g e g r�]_U&btS o eq]_r�W5SZ\/SZY^]�U o S+W5U�S { |fc�bo SªT�rw�fY�e o i � |5\/\1S o S�`[b�c�r�]8v�S h |5Y�v¹\�c o ]�r }tS�]�Y s SZT@] { efT g |fb�b�S g ]�SZ\/SZY^]­b�S { b�|�v�c�rL] { efb o eT�rL\&c o eÒ]_rw|fY¤[r o SZTt]�v�U�]�SZbt\1rLY�U­¯ { efb@]_rLbOv[SZT�v[|5Y�Y�U�SZT�TtS o |5Y o SZT g |5Y�v[rL]_rL|5Y�T�T�c[rLWqefY^]_S�Tªà o S�Tg btrL]_X�b�S�T1v�S�T�U o S g ]_rL|5YÈv[|5rLWfSZY^]aÖ+]_b�S { bt| g�� S�Tav�S g S�clµøcl]_r o rwTtUZT { |fc�b o SZT/v�|5Y[Y�UZS�TZ¤�S+] o eTt]_eq]_rLTt]_rL¥zc�S�v�|5rL]pÖ+]_btS�Ttc[Ý/T_efY^]_S i8£ Y�SOv�U�]�SZb�\/rwY�eq]_rL|5Y g |5btb�S g ]_S�v�c/`�b�c�r�]�v�S h |fY�v1\�c o ]�r }tS�]T�S h eqrL]ªSZYÜv�S�clµ�U+]�e { SZT�¤¾v s ef`¸|5b�v�|5YÜv�U+]_SZbt\1rLY�S o e h |5bt\1S1v�S o e�v�rLTt]_btrw`�cl]_rw|fY�v�c�`[b�c�r�]v�S h |5Y[vî\�c o ]�r }tS�]Z¤�W5|5rLb�T�|5c[T@u(TtS g ]_rw|fY�T £li��[iL� S+] £li´��i k ¤íSZY[T�c�r�]_S�|5Y g e o g c o S o S&Y�|5\�`�b�S&v[SZTU�WfXZY�S�\1S�Yz]�T�\&c o ]_rð}tS�]�TZ¤lWf|5rwb>TtS g ]_rw|fY £�i ¦li

X,+w¤m+0/ ¥cACK26E>F34AHGIA3%9JCKGON4P�9J;§¦¨AQ98C_?47>3BC_PV©�7>347>P«ª¢CJAee

R0S�`[b�c�r�]°v�S h |5Y�v�� � � v�eqY�T o s efY�e o dlTtSee

SZTt]­v�rLb�S g ]_S�\1S�Y^]ªv[U�]_S�b�\/rwY�U7¯ { eqbt]_rLb�v�cT � rw\ kf§�¨�� rw� ��{ ] i R-SZT�U+W5XZY[SZ\/SZY^]_T8\&c o ]_rð}tS�]�TOv[|5rLWfSZY^] { eqT�T�S�b o S�T�\/ÖZ\/SZT g |5c { c�b�S�T�¥zc�So S�T�v�|fY�Y�UZS�T o |5btT�v[S o e { b�U�u(TtU o S g ]�rw|5Y¤ g�hjií£limkli�n[i kzi R-S�T�T�S�c o S�T�v�r���UZbtSZY g SZT g |5Y g SZb�Y[SZY^] o S�Tg |5c { c�b�S�T>T�c�r�WqefY^]_SZT8àl�(T�|;æ �[i k ¤ §�¨xh b | �[i � ¤ ç ¨ µ £ | n^¦ � �>� � |5c ç ¨ µ�� | kf� � § � � ¤o S�T g |5c { c[b�SZT ê�ê u(S o S gy£ S+] ê�ê u²S o S gyn |5Y^]¢U�]_U�Ttc {�{ btrw\/UZSZT�¤zS�]�SZY[Þ�Y o S�T¢U+W5X�Y�SZ\/SZY^]_T�eyd^efY^]{ o c[T>v s c[Y�U o S g ]_bt|5Y�v[S­¥zc�e o rL]�U8R-|l|fT�S8|5Y^]OU�]�U­S�Y o S+W5U�T i§ ]�efY^]$v�|fY�Y�U¹¥zc�S o s SZY[T�SZ\�` o Sºv[SZTa]_S�b�\/SZT$v�S�]_b�rL�5�5S�b�T h eyW5|fb�rwTtS o S�Ta|5`�}tS+]_T §�¨ eyd^efY^]c�Y h efrw` o S ç ¨ µ £ |5c ç ¨ µ[�[¤ { |5c�b7Y�S { eqT/rLY^]_b�|�v�c�rLb�Sav[Sx`[r efrLT�v]¬ ¯ o s rLYzWfSZbtT�rw|fYÐv[S o eg |5c { c�b�S°Ttc�b g SZT�Wqefb�rwef` o S�TZ¤�|fY g |5b�btrw�5S o S­`[b�c�r�]�v�S h |fY�v�� � �èSZY {

T

S+]η¤�v�S­T�|5b@]_S°¥zc�S

T_e­v�rwT@]_b�rL`�c[]�rw|5Y7T�|frL]�SZY$e gZg |fb�vaeyWfS g o e­v[rwTt]�b�rL`�c[]_rL|5Y7v�S�btU h U�b�SZY g Sf¤ g |f\ { |5T�U�S�v s U o S g ]_b�|fY�T�5�¡�

Page 112: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

�% u¡¢( £�imn � ��r*�íU�b�SZY g S;v�S o e�Wqefbtr ef` o S∆S

S�Y^]_b�S o SZT&v�|fY�Y�UZS�T1S+] o eºTtrw\&c o eq]_rL|5Y¤ÑeyWqefY^]g |5btb�S g ]_rL|5Y � ¯ª�^efc g�� S � ¤lS�]�e { b�XZT g |5btb�S g ]_rL|5Y � ¯�v�b�|frL]_S � ¤�v�efY�T o e { efbt]�rwS g SZY^]_b�e o S�v�c g e o |qub�rw\/X�]�b�S i

v�SV\/ÖZ\/SZT g�� efbt�5SZT�¤¾Y�|5Y�`�r efrLT�U�S1S+]&v�U+]_SZbt\1rLY�UZS/T�U { efbtUZ\/SZY^] g |f\1\/S1S�µ { o rL¥�c[U1v�eqY�T o eY�|f]_S S´�5� U i R-SZT h e g ]�SZc�btT�v�S g |5btb�S g ]_rL|5Y g |5b�btSZT { |5Y[v�SZY^]°efc�b_e {[{ |5b@]�S�Y^]_b�S o e7v�rwT@]_btrw`�c[]�rw|5Yv�S8b�U h UZb�S�Y g S°S+] g S oLo S�v[c�`�btc�rL]®v�S h |5Y�v;\&c o ]_rð}tS�]y¤�SZY h |5Y g ]_rL|5Y$v�c

pT

S�]η

v�c { b�S�\1rLSZb®S+]v�c�v[SZclµlrwX�\1S8U o S g ]_bt|5Y o SZT { o c�T�UZY[SZb��fU�]_rL¥zc�SZT i

X�+�¤m+�Y ¥cACD26E>F3BAHGIA3%9JC_G­NBP�98;§¦¨AQ9JCK?47>34CKPV©�7®3B7>P=ª�CJAeeicr

R-S7`�btc�rL]­v�S h |5Y�vî\&c o ]_rð}tS�]8v�eqY�T o s eqY�e o d�TtSeeicr S�Tt]­v�rLb�S g ]_S�\1S�Yz]ªv�U+]_SZbt\1rLY�U7¯ { efb@u

]_rwb8v[c�T � rL\ §�¨ rwY g o c�TtrLWfS/¥zc�S/Y�|5c[T�eyW5|fY�TªbtUye o rwTtU i R0e;v�U�]�SZb�\/rwY�eq]_rL|5Y¹v�SZT­U�WfXZY�S�\1S�Y^]_T\&c o ]�r }tS+]_T�v�eqY�T o s eqY�e o d�TtS

eeicr TtS h efr�]°SZY�T�U o S g ]_rw|fY�Y�efY^]­c�Y�U o S g ]_bt|5Ye

S�]ªc�Y h e � S eicr iR0S�T�U o S g ]_bt|5Y�Te

v[|5rLWfSZY^] { eqT�T�S�b o S�Tª\/ÖZ\/SZT g |5c { c�b�S�T&¥zc�S o SZTªv�|5Y�Y�U�SZT o |5b�T­v�S o e { b�U�uT�U o S g ]_rw|fY¤ g+hji-£limkli�n[i k ¤e o |5b�T�¥�c[S o S h e � S eicr SZT@]°v�U�]�SZb�\/rwY[U&v�efY�T o eVb�U��5rw|fYºv�S�`�btc�rL]8v[Sh |5Y�v;v�S o e�Wqefbtr ef` o S�v�S°T�|fbt]_rLS8v�SZT�btUZT�SZefclµxv�S°Y�S�c�b�|fY�SZT ê�ê u

τS�] ê�ê u(S o S g τ efv�e { ]_U­efclµ

|5`�}tS�]�T>]�efc�T�¤�T�|5r�]�b�S�T { S g ]�rLWfSZ\/SZY^] �li k æ ê�ê uτ

æ �[i´� S+] ê�ê u²S o S g τ æ �[im�fn[i

� ù°¯ ±²�x�:� �x l�ýH�x�HV�y� �$ü�ý³���)��V�ÑýT�$ü��p�y���R-S�T�U�WfXZY�S�\1S�Y^]_T�Ttrw\&c o UZT>|5Y^]�U�]�U�Y�|5bt\Ve o rwTtUZT>S�Y h |5Y g ]_rL|5Y;v�S o e o c�\/rwY�|5TtrL]�U

L¤¸v[S o e

T�S g ]_rL|5YaS�Ý g e g S�v[S { b�|�v�c g ]_rL|5Yσ

¤�S�]�v�S o e g |5b�btS g ]�rw|5YVv�S o s S+Ý g e g r�]_U εSF

� b�e {�{ |5bt]¢SZY^]_btSo s S�Ý g e g rL]�U8v�SZTOv�|5Y�Y[UZSZT�S�]Ov�S o e�T�rL\&c o eq]_rL|5Y � ¤leyW5S g v�S�T { |5rwv[T �

N = L . εSF . σ ��i �=|5c[bv�U�]�SZb�\/rwY[SZb o S8Y�|f\&`�b�S­v s U�WfXZY�S�\1S�Yz]�T�\&c o ]_rð}tS�]_T>S+] { |5c[b�eq\1U o rw|fb�SZb o e�\1|�v�U o rwT�eq]_rL|5Yav�S�Tv�r���UZbtSZY^]_T®`[b�c�r�]_T®v�S h |5Y�v¤lv�SZT h e g ]_S�c�b�T>v�S�Y�|5b�\1e o rwT_eÒ]_rw|fY/|fYz]®U�]_U g e o g c o U�T { |5c�b g�� ef¥zc�SU g�� efY^]�r owo |5YÐv�Sº`�btc�rL]Vv�S h |5Y[v¤®¯ { efbt]�rwb7v s c�Y³e~}tc�T@]_SZ\/SZY^]$btUye o rwTtUáT�c[b o eîv�rwT@]_btrw`�c[]�rw|5Yv�S o e$\VefTtT�S/rwY^Wqefb�rwefY^]_S�v�c�`�|fT�|5Y

Zv[SZT�v[|5Y�Y�U�SZT i R s e¡}tc�Tt]�SZ\/SZY^] { SZbt\1S+]­v s |f`[]_S�Y�rwb o S

\1S�r owo SZc�b�e gZg |fb�v { |5T�Ttrw` o SªS�Y^]_b�S o SZT�v�|5Y�Y[UZSZT�S�] o SZT�`�b�c�r�]_TOv�S h |5Y[v i R s e~}tc�T@]_S�\1S�Yz]8eVU�]�USl��S g ]�c�U­T�rw\�c o ]_efY�UZ\/SZY^] { |5c�b o SZT�¥zc�eq]�b�S g efY�efclµ �

ee¤eeicr ¤ µµ

¤[S�]µµtrace � S�] { |fc�b o S�T

v�r���UZbtSZY^]_S�TO\�c o ]�r { o r g r�]_U�T¢v�S�T�}tS+]_T i � o g |5Y�TtrwT@]_S­¯�\1rLY�rw\/rwTtSZb o Sχ2 Ttc�rLWqefY^]­à

�f�5�

Page 113: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

χ2 =∑

i

j

m

[

Dijm − αij . Qij

m − kL . kiε . (kj

Z . Zijm + Oij

m)]2

Dijm

+∑

k

(kX − 1)2

σ2X

� £li kf�

|5Úm

S�Tt] o SV`�rwYÛv�S o eº\VefTtT�Sq¤i

SZTt] o s c�Y�v[SZT7¥zc�eq]_btS g efY�eqclµ�¤�S�]j

SZTt] o S$Y�|5\&`�btS$v�S}tS�]�T i D

SZTt] o S�Y[|5\&`�btS/v[SZT­v�|5Y�Y�U�SZT�¤Z

SZT@] o S7Y�|5\&`�btS7v�SZT­U�WfXZY�S�\1S�Yz]�T�½��}tS�]�TZ¤O

S�Tt]o S&Y[|5\&`�btS&v�SZT°U+W5XZY[SZ\/SZY^]_T­v�rw`¸|5Tt|5Y�T8S�]

tt¤�S�]

QS�Tt] o S�Y�|5\&`�btS�v�SZT°U+W5XZY[SZ\/SZY^]_T­\&c o u

]_rð}tS�]_T i kL

¤ki

ε

¤íS�]kj

Z

T�|fYz]�b�SZT { S g ]�rLW5S�\1S�Y^] o SZT h e g ]�SZc�btT�v�S g |fb�b�S g ]�rw|5Yºv[S o e o c�\/rwY�|5TtrL]�Uf¤v�SZT h e g ]�SZc�btT�v s U g�� S owo S � � � � v�efY�T g�� ef¥zc�S g efY�e o ¤0S�]ªv�S o exTtS g ]�rw|5Y�S�Ý g e g Sav�S { b�|�v�c g u]_rL|5Y�v[SZT&U+W5XZY[SZ\/SZY^]_T

Z + jets { |5c�b g�� ef¥zc�S$\&c o ]_r { o r g rL]�U&v�S8}tS�] i=§ Y[Þ�Y¤αij T�|5Y^]&v[SZT

h e g ]�SZc�btT o rL`�b�S�T { S�b�\/S�]�]_efY^]8v�S7v�U+]_SZbt\1rLY�SZb o S&Y�|5\�`�b�S�v�S�T°U�W5X�Y�SZ\/SZY^]�T�\&c o ]_rð}tS�]_T { |fc�bg�� ef¥zc�S g eqY�e o S+] g�� ef¥zc�S7\&c o ]_r { o r g rL]�U­v[S�}tS+] i � |f\1\/S o S�Y�|5\&`�btS&v�S { efb�ef\/X�]_btSZT°¯av�U�u]_S�b�\/rwY�S�b�v�rLb�S g ]_S�\1S�Y^]8v�SZT8v[|5Y�Y�U�SZT8SZT@]8]_bt| { rw\ { |5bt]_efY^]y¤ c�Y�S g |5Y^]_b_eqrwY^]_S&S�µ�]_SZbtY�S�v�S o eh |5b�\/S

(kX − 1)2/σ2X

SZT@]>Y�U g SZTtT_efrLb�Sq¤ kX

S�Tt] o e�Y�|f]_eq]_rL|5YV�5U�Y�UZbtrw¥zc�S�v[SZTkL

¤ki

ε

¤kj

Z

S+] o S�TσX

T�|5Y^] o S�c�b�T�S�b�b�S�c�b�T�btSZT { S g ]_r�W5SZT iR0e­TtS g ]�rw|5Y1S�Ý g e g S�v[S { bt|lv[c g ]�rw|5Y/v�c { b�| g SZTtT�c�TZ +0 jet

SZT@]®`�rLSZY g |5Y�Yzc�S�S�]¢v�|5Y g T�|5Y{ efb�ef\1X+]_btS

k0Z

S�Tt]�Þ[µlUO¯ �5i R-S h e g ]_S�c�bkL

Y�S { SZc[] { efT�Ö�]�b�S>v�U+]_S�b�\/rwY�U®rLY�v�U { S�Y�v�SZ\/\/SZY^]v�SZT h e g ]_SZc[b�T

kiε

S+]kL

¤�r o e/v�|fY g efc�T�Ttr0U�]_U°Þ[µlUª¯ �fi¸· Y�e7b�S owä g�� U g S+]�]�S g |5Y^]_b_eqrwY^]_S { o c�T]�efbtv { |5c[b>v�U�]�SZb�\/rwY[SZb o s SZbtb�S�c�b�Ttd�Tt]�UZ\1eq]_rL¥�c[S iR-S�`�btc�rL]�v�S h |5Y�v1\&c o ]_r }tS+]�v�|5\/rwY[S�eqclµ/`�efTtT�SZT¢\VeqT�T�S�T�v�c

Z� ¨

Z

æ �5� �°S²± �+i R s e~}tc[Tt]_S�u\1S�Y^]�S�Tt]8e {�{ o rL¥zc�U°SZYºv�S�clµáU�]�e { S�TZ¤¸v s eq`�|5btv¤ r o S�Tt]�btUye o rwTtU�eyW5S g v�S�T { efb�ef\/X�]_btSZT o rL`�b�S�TT�c�b o s rLYz]�SZb@Wfe owo SOv�S°\1efT�TtS g |5\ { b�rLT>SZY^]_btS �5� �8S²±èS�] �~¦q� �8S²± i ��c�rLT o S h e g ]_S�c�b�v�c�`[b�c�r�]v�S h |5Y�v7\&c o ]_rð}tS�]y¤

αij SZTt]pÞ[µlUOS�] o s e~}tc�T@]_S�\1S�Yz]�S�Tt]�b�UZe o rLT�U>T�c[b o s rLY^]_SZb@Wqe owo S�v�S�\1efT�TtS g |5\�u{ b�rLT>SZY^]_btS �5� �°S²±èS�] �¡¦f� �°S²± iR s e~}tc[Tt]_S�\1S�Y^]�S�Tt]¢Sl��S g ]�c�U�TtU { eqb�UZ\/SZY^] { |5c[b o SZT���c�Y�T����je°S�]¢���(`¤zS�] { |5c�b o S�Tp]�| { | o |5�frwSZTv�r�u²U o S g ]�b�|5Y[T �>� u �>� S�] § � u �>� i R-SZT�b�UZTtc o ]_eq]_T�Tt|5Y^]�btSZ�5bt|5c { UZTOv�efY�T o SZT>]_ef` o SZefclµ £�i ¦ �£li��5��{ |fc�b o SZT­��c�Y�T°���je;S�]­�t�(` { |5c�b o S�T8¥�c�eq]_btSVefY�e o d�T�S�T � { |fc�b o s efY�e o d�T�S

ee�>� u § � �+iR-SZT»S�b�b�S�c�b�T�btS { btUZTtSZY^]_S�Yz]¢T�S�c o S�\1S�Y^] o S�T»SZbtb�SZc[b�T�Tt]_eq]_rLTt]�rw¥zc�SZT i R-SZT�S�b�btSZc�btT�Ttd�Tt]�UZ\1eq]_rL¥�c[SZT

T�|5Y^]ªv�|5Y�Y[UZSZTªSZY�� i kli��fi R-SVbtUZTtc o ]_eq]­v�S o exY[|5b�\1e o rLT_eq]�rw|5YáSZTt]�r oLo c�T@]_b�U�Ttc�b o eaÞ��5c�btS £lim£{ |fc�b o S�T�efY�e o dlTtSZT

eeS�]

eeicr i

�5�~k

Page 114: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

´�µl¶jet

η1

correction

´*·p¶∆R(jet1, jet2) correction

�% u¡¢( £li�� � � |5btb�S g ]_rL|5Y�T>e {�{ o rL¥zc�UZS�T�efcª}tS�] o S { o c[T®UZY�S�b��5U+]_rL¥�c[S8SZY h |5Y g ]_rw|fY$v�Sη £li´� � e � ¤S�] o SZT g |5btb�S g ]_rL|5Y�T�e {�{ o rw¥zc�UZS�T�¯ o e1v[rwTt]_efY g S�v�efY[T o S { o efY �

η, φ � SZY^]_btS o S�T�v[SZclµ7}tS�]�T o S�T{ o c�T>U�Y�SZbt�5U�]�rw¥zc�S�T £li´� � ` �+i

�f�¡n

Page 115: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

]-1s-2Lumi per tick [cm0 1 2 3 4 5 6 7 8 9 10

Even

ts /

Bin

0

10000

20000

30000

40000

50000

60000

]-1s-2Lumi per tick [cm0 1 2 3 4 5 6 7 8 9 10

Even

ts /

Bin

0

10000

20000

30000

40000

50000

60000DataZ+jetsZ+HFTopDibosonMultijetZH x100

´*µl¶RunIIa

]-1s-2Lumi per tick [cm0 1 2 3 4 5 6 7 8 9 10

Even

ts /

Bin

0

10000

20000

30000

40000

50000

60000

]-1s-2Lumi per tick [cm0 1 2 3 4 5 6 7 8 9 10

Even

ts /

Bin

0

10000

20000

30000

40000

50000

60000 DataZ+jetsZ+HFTopDibosonMultijetZH x100

´b·p¶RunIIb

�% u¡¢( £�i ¦ � ��rwT@]_b�rL`�c[]�rw|5Y�v�c { b�|qÞ o v�S o e o c[\1rLY�|5T�r�]_U¢rwY�T@]�efY^]�eqY�UZSq¤le { b�X�T g |5b�btS g ]�rw|5Yí¤ { |fc�bo S8��c�Yx���je £lim¦ � e � S�] o S�T��Oc�Yx���(` £lim¦ � e ��i

[cm]0Vertex z-60 -40 -20 0 20 40 60

Even

ts /

Bin

0

2000

4000

6000

8000

10000

[cm]0Vertex z-60 -40 -20 0 20 40 60

Even

ts /

Bin

0

2000

4000

6000

8000

10000

DataZ+jetsZ+HFTopDibosonMultijetZH x100

´*µl¶RunIIa

[cm]0Vertex z-60 -40 -20 0 20 40 60

Even

ts /

Bin

0

5000

10000

15000

20000

25000

30000

[cm]0Vertex z-60 -40 -20 0 20 40 60

Even

ts /

Bin

0

5000

10000

15000

20000

25000

30000 DataZ+jetsZ+HFTopDibosonMultijetZH x100

´b·p¶RunIIb

�% u¡¢( £li�� � ��rwT@]_b�rL`�c[]�rw|5Y&v[c7WfSZb@]_S+µ { b�rL\VefrLb�S�v�c7`�|fT�|5Y1½¾¤5e { b�X�T g |5btb�S g ]_rL|5Y¤ { |5c�b o S>��c�Y���je £li�� � e � S�] o S�TO�Oc�Y[TO�t�(` £�im� � e ��i

�5�y�

Page 116: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

��c�Y;���jei µµ

S�S � �>� u �>� � µµtrace eeicr

kiε

�[i � ¦f� ± �[i��5�5n � �fim�5� ± �[i��5�f�5n �[i �5� ¦ ± �lim�[�y�^¦ �fim�5n ± �[i��5�^£��αi0 n[i��[� ± �[imkf�^¦ �[i � nf� ± �[i��[�~k�� � �5i�� ± �[i��^£αi1 �[i kqn � ± �[i��5n5�5n �[im£ � � ± �[i��^kf�5¦ � �[im¦f�^£ ± �lim� �f�αi2 �lim�5� � k � ± �[i��5�5n^£ � �[im¦ � n ± �[i��^kq�5� � �[i��^k5k ± �liL�~kf¦

�Oc�Y[TO�t�(`i µµ ee

� �>� u �>� � µµtrace eeicr

kiε

�[i � � � ± �[i��5�^kfn �[i � � ± �[i��5�^kq� �[i � k � ± �[i��5�5� � �[i � ¦l� ± �[i��5�f�^kαi0 �5i � � ± �[i�� � ¦fn �[i��^£ ± �[i��5�5n � �[i��^£fn ± �[i��[�~£ �αi1 �[iL� � � ± �[i��^kl�~¦ �[i��5� � ± �[i��5� � £ � �[i�n � � ± �[i��^kf�fnαi2 �lim�[�f�~k ± �[i��5�^k5¦5¦ �[im¦q�^� ± �[i��[�5�~¦ � �[i�n^kq� ± �[i��5n5nl�

��c�Y;���je ��c�Y�T��t�(`k0

Z� �

k1Z

�[i � ¦5£ ± �lim�5�5£l� �li � kÒ� ± �lim�5�q�^�k2

Z�fiL�5� ± �lim�[�¡k �5im�q� ± �lim�5� �

#%$'&)( £lim¦ � �OU�T�c o ]�eq]¢v�S o s e¡}tc�Tt]�SZ\/SZY^] g |5\&`�rLY�U { |5c[b o SZT�¥zc�eÒ]_b�S�efY�e o d�T�SZT�¤[eyWfS g ee� �>� u

�>� � ¤�S�] { |5c�b o SZTO�Oc[Y�T����je�S�]O���(` i

i�Oc�Yx���je

ee� �>� u § � � �Oc�Y[TO�t�(`

ee� �>� u § � �

kiε

�5im�5k ± �[im�f�^¦q��� �[i � kq� ± �[i��5�5nq�z¦αi0 �[i � £5k ± �[i��[�¡�5n �[i��^£fn ± �[i��5�5n5¦5kαi1 �[i £q� � ± �[i��^k5¦5¦ �[i��5�[� ± �[i��5� � �αi2 �[i�� ± �[im�5kq� � �[im¦l� � ± �[im�l�5� �

�Oc[Y�T����je7S�]O���(`k0

Z�

k1z

�[i � ¦ ± �[im�f� � �[�k2

Z�5imk ± �[im�5kl�5�

#%$'&)( £li�� � ��UZTtc o ]_eq]ªv�S o s e~}tc[Tt]_S�\1S�Y^] g |f\&`�rwY[U { |5c�b o s efY�e o dlTtSee

� �>� u § � �ª{ |5c�b o S�T�Oc�Y[TO�t�je�S�]O���(` i

�f�~¦

Page 117: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

[GeV]llM0 20 40 60 80 100 120 140 160 180 200

Even

ts /

Bin

0

2000

4000

6000

8000

10000

12000

14000

[GeV]llM0 20 40 60 80 100 120 140 160 180 200

Even

ts /

Bin

0

2000

4000

6000

8000

10000

12000

14000 DataZ+jetsZ+HFTopDibosonMultijetZH x100

´*µ�¶Mee

[GeV]llM0 20 40 60 80 100 120 140 160 180 200

Even

ts /

Bin

0

500

1000

1500

2000

2500

3000

3500

4000

[GeV]llM0 20 40 60 80 100 120 140 160 180 200

Even

ts /

Bin

0

500

1000

1500

2000

2500

3000

3500

4000DataZ+jetsZ+HFTopDibosonMultijetZH x100

´*·p¶Meeicr

�% u¡¢( £lim£ � ��rwT@]_b�rL`�c[]�rw|5Yxv�S o e/\1efTtT�S�rLY^Wfeqb�r eqYz]�Sªv[SZT�v�S�clµ�U o S g ]�b�|5Y[T { |5c�b o s eqY�e o d�TtSee£lim£ � e � ¤zS�]

eeicr £lim£ � ` � ¤�e { btXZT o e°Y�|5b�\1e o rwT_eÒ]_rw|fY&v�S�]�|5c�T o SZT�`�btc�rL]�T¢v�S h |5Y�vVefclµ1v�|5Y�Y[UZSZT i

�5�¡�

Page 118: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

� ù0¸ �@�ý6��)V�����Hl�y�;ý �$ü ¹,�y����'ºy +ü �����»��� þ��Hl¼½�$ü��d�x¾ªü �$ü�ý�íü��ÑýT�$ü¿�

� { b�X�T o S�T�U�]_e { S�T�v�S o e { btU+u(TtU o S g ]�rw|5Y � g�hji£li k�imnf� ¤ív[SZT8v�r*�íU�b�SZY^]�SZT g |fb�b�S g ]�rw|5Y�T�e {�{ o r�u¥�c[UZSZT�¯ o e­Ttrw\&c o eq]_rL|5Y � g+hjil£limnli kq� ¤zS�]¢v�S o e°T�U o S g ]_rw|fYVv�c1`�b�c�r�]�v�S h |fY�vV\&c o ]_rð}tS�] � g�hjil£li´�^� ¤o SZT>v[|5Y�Y�U�SZT { S�c[W5S�Yz]�Ö�]�b�S g |5\ { efbtUZS�T�¯ o e&T�rw\�c o eq]�rw|5Y iR0S�T�]�eq` o S�T £lim£ S+] £li �Vb�S��5b�|fc { S�Y^] o S­Y�|5\&`[b�S�v s U+W5XZY[SZ\/SZY^]_T°T�U o S g ]_rL|5Y�Y�U�T { |5c�b o SZT�efY�eÒuo d�T�S�T

eeS�]

eeicr btSZT { S g ]_r�W5S�\1S�Yz] i�· Yxda]_bt|5c[WfSªS�Yz]�b�Sªefc[]�b�SZT�¤ { |5c[b o SZTO��c�Y�TO���je7S�]O���(`¤o S&Y�|f\&`�b�S�v[SZT°v�|5Y�Y[UZSZT�¤0v�SZT°v�r*�íU�b�SZY^]�T­`[b�c�r�]_T8v�S h |5Y[v¤-efrLY�T�r»¥zc�S g S o c[r»v�cîT�rw�fY�e o

ZH{ |5c[b�c�Y�S�\VefTtT�S&v[S �5�~¦ �8S²±&¤�e { btXZT°eyW5|frwb�e {�{ o rL¥zc�U o SZT g |5c { c[b�SZT8v[S { b�U�u(TtU o S g ]�rw|5Y¤ g�hji£li k�imn S�] £li´�[iR0S�T>Þ��5c�btSZT £li ��S�] £li � \1|5Y^]�b�SZY^] o e&v�rwT@]_b�rL`�c[]�rw|5Yav[S {

T

S+]�v�Sη { |5c�b o S�T>v�SZc�µ;U o S g ]�b�|fY�T

v�S { o c[T � efc[]�S8rw\ { c o T�rw|fY/]�b_efY�T@W5S�b�T�Sq¤ b�SZT { S g ]�rLW5S�\1S�Y^] { |5c�b o S g efT eeS�]

eeicr i R0e�Þ��5c�btS£liL�y� \/|5Y^]_b�S o e;v�rLTt]_btrw`�cl]_rw|fYîv[S o ex\VeqT�T�S1rwY^Wqefb�rwefY^]_S7S�]�v�S o s rL\ { c o Ttrw|5Yá]�b_efY[TtW5S�b�TtS$v�c`�|5Tt|5Yx½¾¤ { |5c�b o S g eqT ee

S+]eeicr i � |f\1\/S o S�T�efY�e o d�T�SZT

eeS+]

eeicr U�]_c[v�rwU�SZT>T�U { efbtUZ\/SZY^]{ b�U�T�SZY^]�SZY^] o eª\/ÖZ\/S�]�| { | o |5�frwS { |fc�b o SZTÑ}tS+]_TZ¤lr o SZT@]¾}tc�v�r g rwS�clµ1v�S g |5\&`�rLY�SZb o SZT¢b�U�T�c o ]�eq]�T{ |5c[bpe¡Wf|5rwb { o c�Tpv�S�Tt]_eq]_rLTt]_rL¥zc�S>S�]¢v�|5Y g�{ |5c�bp\/rwSZc�µ�}tc��5S�bpv�S o s e gZg |5b�v7SZY^]�b�S o SZTpv�|fY�Y�UZS�TS�] o e�T�rw\�c o eq]�rw|5Y i � rwY�Ttr ¤ o e�Þ��fc�b�S £li��5� \/|5Y^]_btS o e�v�rLTt]�b�rw`[c[]_rL|5Y�v�S o s rL\ { c o Ttrw|5Y°]_b�efY�TtWfSZbtT�SS�]&v[S

ηv�SZT&v[SZclµx}tS�]_T o S�T { o c�T�U�Y�SZbt�5U�]�rw¥zc�S�TZ¤ { |5c�b o S g efTª|5Ú o S�T&efY�e o d�T�S�T

eeS�]

eeicrT�|5Y^] g |f\&`�rwY[UZSZT i R0eVÞ��5c[b�S £li��~k \/|5Y^]_btS o eVv[rwTt]�b�rL`�c[]_rL|5Yáv[S o eVv�rLTt]_efY g S�SZY^]_btS o SZT�v�SZclµ}tS�]_T

∆R¤¢S+] g S oLo S;v�S o SZc[b/\1efTtT�SárLY^Wfeqb�r eqYz]�S { |5c[b o S g efT/|5Ú o SZT1efY�e o dlTtSZT

eeS�]

eeicrT�|5Y^] g |5\�`�rwY�U�SZT i R s SZY[T�SZ\�` o S�v�SOY�|5Tpv�rLTt]_btrw`�cl]_rw|fY�T»\/|5Y^]_b�S�Y^]¢¥zc s e { btXZT g |5btb�S g ]_rL|5Y¤5Y[|f]_btST�rw\�c o eq]�rw|5Y1v�U g b�r�] g |5b�btS g ]_SZ\/SZY^]OY�|5T�v�|fY�Y�UZS�T i

�f�~£

Page 119: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

[GeV]T

Lepton p0 20 40 60 80 100 120 140

Even

ts /

Bin

0

1000

2000

3000

4000

5000

6000

7000

8000

9000

[GeV]T

Lepton p0 20 40 60 80 100 120 140

Even

ts /

Bin

0

1000

2000

3000

4000

5000

6000

7000

8000

9000 DataZ+jetsZ+HFTopDibosonMultijetZH x100

´*µl¶pe1

T

ηLepton -3 -2 -1 0 1 2 3

Even

ts /

Bin

0

500

1000

1500

2000

2500

3000

3500

ηLepton -3 -2 -1 0 1 2 3

Even

ts /

Bin

0

500

1000

1500

2000

2500

3000

3500 DataZ+jetsZ+HFTopDibosonMultijetZH x100

´b·p¶ηe1

[GeV]T

Lepton p0 10 20 30 40 50 60 70 80 90 100

Even

ts /

Bin

0

2000

4000

6000

8000

10000

12000

14000

[GeV]T

Lepton p0 10 20 30 40 50 60 70 80 90 100

Even

ts /

Bin

0

2000

4000

6000

8000

10000

12000

14000 DataZ+jetsZ+HFTopDibosonMultijetZH x100

´�ÀM¶pe2

T

ηLepton -3 -2 -1 0 1 2 3

Even

ts /

Bin

0

500

1000

1500

2000

2500

3000

3500

ηLepton -3 -2 -1 0 1 2 3

Even

ts /

Bin

0

500

1000

1500

2000

2500

3000

3500DataZ+jetsZ+HFTopDibosonMultijetZH x100

´*Á�¶ηe2

�% u¡¢( £li � � ��rwT@]_b�rL`�c[]�rw|5Y&v[S o s rw\ { c o T�rw|fY­]�b_efY�T@W5S�b�T�SpT

S�]pv[S o e�v�rLTt]�b�rw`[c[]_rL|5Y&efY[�5c o eqrwb�Sη¤

{ |fc�b o s U o S g ]�b�|5Yxv�S { o c�T � eqc[]_S­rw\ { c o T�rw|fYa]_b_eqY�TtWfSZb�TtSf¤�b�SZT { S g ]�rLW5S�\1S�Y^] £li � � e � S+] £li � � ` � ¤S�] { |5c[b o S�v�SZc�µ[rLXZ\/SáU o S g ]_bt|5Yøv�S { o c�T � efc[]�Sºrw\ { c o T�rw|fYÛ]�b_efY[TtW5S�b�TtSf¤>b�S�T { S g ]_rLWfSZ\/SZY^]£li � � gy� S+] £li � � v � ¤�v�efY[T o s efY�e o d�T�S

ee i � c g c�Y�S g |5c { c�b�S�T�c�b o e¶\VeqT�T�S�v�cZ

|5c Ttc�b o SY�|5\&`[b�S8v�S�}tS�]�T�Y s S�Tt]�e {�{ o rw¥zc�U�S i

�5� �

Page 120: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

[GeV]T

Lepton p0 20 40 60 80 100 120 140

Even

ts /

Bin

0

1000

2000

3000

4000

5000

6000

[GeV]T

Lepton p0 20 40 60 80 100 120 140

Even

ts /

Bin

0

1000

2000

3000

4000

5000

6000DataZ+jetsZ+HFTopDibosonMultijetZH x100

´�µl¶pe

T

ηLepton -3 -2 -1 0 1 2 3

Even

ts /

Bin

0

200

400

600

800

1000

1200

1400

1600

ηLepton -3 -2 -1 0 1 2 3

Even

ts /

Bin

0

200

400

600

800

1000

1200

1400

1600 DataZ+jetsZ+HFTopDibosonMultijetZH x100

´*·p¶ηe

[GeV]T

Lepton p0 10 20 30 40 50 60 70 80 90 100

Even

ts /

Bin

0

500

1000

1500

2000

2500

3000

3500

4000

4500

[GeV]T

Lepton p0 10 20 30 40 50 60 70 80 90 100

Even

ts /

Bin

0

500

1000

1500

2000

2500

3000

3500

4000

4500 DataZ+jetsZ+HFTopDibosonMultijetZH x100

´�ÀM¶peicr

T

ηLepton -3 -2 -1 0 1 2 3

Even

ts /

Bin

0

1000

2000

3000

4000

5000

ηLepton -3 -2 -1 0 1 2 3

Even

ts /

Bin

0

1000

2000

3000

4000

5000

DataZ+jetsZ+HFTopDibosonMultijetZH x100

´*Áp¶ηeicr

�% u¡¢( £li � � ��rLTt]_btrw`�cl]_rw|fYVv�SpT

S�]>v�Sη { |5c�b o s U o S g ]�b�|5Yav[c g e o |5b�rL\1X+]_btSf¤^b�S�T { S g ]_rLWfSZ\/SZY^]

£li � � e � S�] £li � � ` � ¤=S+] { |5c�b o s U o S g ]�b�|5Yîv�S o s � � �­¤0b�S�T { S g ]_rLWfSZ\/SZY^] £li � � g¡� S+] £li � � v � ¤Ñv�efY[To s efY�e o dlTtS

eeicr i � c g c�Y[S g |5c { c�b�SaTtc�b o e�\1efT�TtSav�cZ

|5c�T�c�b o SVY�|f\&`�b�SVv�S°}tS+]_T&Y s SZT@]e {�{ o rw¥zc�UZS i

�f� �

Page 121: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

[GeV]llM0 20 40 60 80 100 120 140 160 180 200

Even

ts /

Bin

0

2000

4000

6000

8000

10000

12000

14000

[GeV]llM0 20 40 60 80 100 120 140 160 180 200

Even

ts /

Bin

0

2000

4000

6000

8000

10000

12000

14000 DataZ+jetsZ+HFTopDibosonMultijetZH x100

´*µ�¶Mee

[GeV]T

Z p0 20 40 60 80 100 120 140 160 180 200

Even

ts /

Bin

0

5000

10000

15000

20000

25000

30000

35000

[GeV]T

Z p0 20 40 60 80 100 120 140 160 180 200

Even

ts /

Bin

0

5000

10000

15000

20000

25000

30000

35000DataZ+jetsZ+HFTopDibosonMultijetZH x100

´*·p¶pee

T

[GeV]llM0 20 40 60 80 100 120 140 160 180 200

Even

ts /

Bin

0

500

1000

1500

2000

2500

3000

3500

4000

[GeV]llM0 20 40 60 80 100 120 140 160 180 200

Even

ts /

Bin

0

500

1000

1500

2000

2500

3000

3500

4000DataZ+jetsZ+HFTopDibosonMultijetZH x100

´�ÀM¶Meeicr

[GeV]T

Z p0 20 40 60 80 100 120 140 160 180 200

Even

ts /

Bin

0

2000

4000

6000

8000

10000

12000

14000

[GeV]T

Z p0 20 40 60 80 100 120 140 160 180 200

Even

ts /

Bin

0

2000

4000

6000

8000

10000

12000

14000 DataZ+jetsZ+HFTopDibosonMultijetZH x100

´*Áp¶peeicr

T

�% u¡¢( £li��¡� � ��rwT@]_b�rL`�c[]�rw|5YÈv�S o e�\1efT�TtS¹rwY^Wqefb�rwefY^]_S�S�];v�S o s rL\ { c o T�rL|5YÛ]_b_eqY�TtWfSZb�TtS�v[SZTv�SZc�µ7U o S g ]�b�|5Y[T { |5c�b o s eqY�e o d�TtS

ee¤^b�S�T { S g ]_rLWfSZ\/SZY^] £�iL�¡� � e � S+] £liL�y� � ` � ¤5S+] { |5c�b o s eqY�e o d�TtS

eeicr ¤�b�SZT { S g ]�rLW5S�\1S�Y^] £liL�y� � gy� S�] £�iL�¡� � v ��i � c g c�Y�S g |5c { c[b�S�T�c[b o eV\1efT�TtS&v�cZ

|5c¹Ttc�bo S�Y[|5\&`�btS­v[S®}tS+]_T�Y s SZT@]�e {[{ o rL¥�c[UZS i

�~kf�

Page 122: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

[GeV]T

Jet p0 20 40 60 80 100 120 140

Even

ts /

Bin

0

200

400

600

800

1000

1200

1400

1600

1800

2000

[GeV]T

Jet p0 20 40 60 80 100 120 140

Even

ts /

Bin

0

200

400

600

800

1000

1200

1400

1600

1800

2000 DataZ+jetsZ+HFTopDibosonMultijetZH x100

´*µ�¶p

jet1

T (ee, eeicr)

ηJet -3 -2 -1 0 1 2 3

Even

ts /

Bin

0

100

200

300

400

500

600

ηJet -3 -2 -1 0 1 2 3

Even

ts /

Bin

0

100

200

300

400

500

600 DataZ+jetsZ+HFTopDibosonMultijetZH x100

´*·p¶ηjet1 (ee, eeicr)

[GeV]T

Jet p0 10 20 30 40 50 60 70 80 90 100

Even

ts /

Bin

0

500

1000

1500

2000

2500

3000

3500

4000

4500

[GeV]T

Jet p0 10 20 30 40 50 60 70 80 90 100

Even

ts /

Bin

0

500

1000

1500

2000

2500

3000

3500

4000

4500DataZ+jetsZ+HFTopDibosonMultijetZH x100

´�ÀM¶p

jet2

T (ee, eeicr)

ηJet -3 -2 -1 0 1 2 3

Even

ts /

Bin

0

100

200

300

400

500

ηJet -3 -2 -1 0 1 2 3

Even

ts /

Bin

0

100

200

300

400

500

DataZ+jetsZ+HFTopDibosonMultijetZH x100

´�Á�¶ηjet2 (ee, eeicr)

�% u¡¢( £li��5� � ��rwT@]_btrw`�c[]�rw|5Y�v[SpT

S�]/v�Sη

v�cº}tS�] o S { o c�T�U�Y�SZbt�5U+]_rw¥zc�Sxb�S�T { S g ]_rLWfSZ\/SZY^]£liL�f� � e � S+] £liL�f� � ` � ¤�S�]1v�cÐT�S g |5Y�vî}tS+] o S { o c�T1U�Y�SZbt�5U�]�rw¥zc�Sxb�S�T { S g ]�rLWfSZ\/SZY^] £�iL�5� � g¡� S+]£liL�f� � v � ¤ { |5c�b o S g efT$|fÚ o SZT;efY�e o d�T�S�T

eeS�]

eeicr T�|5Y^] g |5\&`�rLY�UZS�T iO· Y:v�SZ\1efY�v[S¶efc\1|5rLY�T�v[SZclµV}tS+]_T8v�eqY�T o SZT�U�W5X�Y�SZ\/SZY^]�TªS+] o ea\1efT�TtS�v�c

Zv�|5rL]�Ö�]_btS g |5\ { btrwT�S�SZY^]_btS �f��°S²±ôS+] �¡¦f� �°S²± i

�¡kl�

Page 123: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

jj R∆0 1 2 3 4 5 6

Even

ts /

Bin

0

100

200

300

400

500

600

700

800

900

jj R∆0 1 2 3 4 5 6

Even

ts /

Bin

0

100

200

300

400

500

600

700

800

900 DataZ+jetsZ+HFTopDibosonMultijetZH x100

´�µl¶∆Rjet1,2

(ee + eeicr)

[GeV]jjM0 20 40 60 80 100 120 140 160 180 200

Even

ts /

Bin

0

200

400

600

800

1000

1200

1400

[GeV]jjM0 20 40 60 80 100 120 140 160 180 200

Even

ts /

Bin

0

200

400

600

800

1000

1200

1400 DataZ+jetsZ+HFTopDibosonMultijetZH x100

´*·p¶M jet1,2

(ee + eeicr)

�% u¡¢( £li��~k � ��rLTt]�b�rw`[c[]_rL|5Y�v[S o exv�rLTt]_efY g S1SZY^]_btS o SZT­v�SZclµ$}tS+]_T £�iL�~k � e � ¤0S�]ªv�S o ex\1efT�TtSrwY^Wqefb�rwefY^]_S�v�S�T¾v�S�clµ>}tS�]�T £li��~k � ` � ¤ { |5c�b o S g eqT¾|5Ú o SZTÑefY�e o d�T�S�T

eeS�]

eeicr T�|fYz] g |5\�`�rwY�U�SZT i· Y�v�SZ\1efY�v�S;eqcÐ\/|5rLY�T�v�S�clµá}tS+]_T�v�efY[T o SZT�U�W5X�Y�SZ\/SZY^]�T1S+] o eº\1efT�TtS$v�c

Zv�|5rL]&Ö�]_btS

g |5\ { btrwT�S�SZY^]_btS �5� �8S²±ôS�] �~¦f� �8S²± i� ù �  �Hl¼½�$ü��d�x¾ªüÃ�;ü�ý"�ü��ÑýÄ�;ü¿�X,+«X,+0/ Å�5];=34^�;=ÆyAO?4A�ÇÈ<®3B^É9J;=<>3434AHGIA3®9_?4NËÊ ¼ 9J7>Ì>Ì®;=3BÌ

�=|5c�bVb�UZv[c�rwbtS o S�TV`�btc�rL]�TVv�S h |5Y�v � g�hji®£limnf� ¤�S�];eqc��5\/SZY^]_S�b o eîT�S�Y�T�rL`�r o rL]_U;v�SáY�|f]_btST�rL�5Y�e o ¤ o S�Tí}tS�]_Tpv�SO`/T�|5Y^]�U�]�rw¥zc�S�]�UZT¢eyW5S g c�Y�S�\/U�] � |lv�SOe {[{ S o UZS�©(`lu²]_ef�5�5rLY��q� i � S�]t]_S�]_S g�� uY�rw¥zc�SOSZT@]®`�eqT�UZS�T�c�b o S�]_S�\ { T�v�SOWlrLS�btS o eq]_r�W5SZ\/SZY^] o |5Y[�ªv�c1¥zc�efb � ` i � rLY�T�r ¤ o S�T-}tS+]_T�v[S�`{ S�c[W5S�Y^]�Ö�]_btS�v�r*�íU�b�S�Y g rLUZT�v[SZTÑ}tS+]_T®v�S�¥zc�efb � T o UZ�5S�b�T®¯ o s efrwv�S�v�S�T®rwY[v�r g eq]_rL|5Y�TpT�c�r�WqefY^]_SZT�ào S�Tp]�b_e g SZT { b�|¡W5S�Y�efY^]>v�S o e°v�U�T�rwY^]�UZ�5b�eq]_rL|5YVv�c1¥zc�efb � `1T�|5Y^]®rLT�Ttc�T¢v[cVW5S�bt]_S�µaTtS g |5Y�v�efrLb�Sq¤S�] o e7v[rwTt]_efY g S­v s e {[{ b�| g�� S­\1rLY�rw\1e o S�S�Yz]�b�S o e&]_b�e g S g�� efb��5U�SªS+] o S�W5S�bt]�S+µ { b�rLY g r { e o � v�r�]{ efb�ef\1X+]_btS8v s rL\ { e g ] � SZT@]�U o S+W5UZSq¤�W5|5rLb®Þ��5c�btS £�iL�¡n�iê |f]�|5Y�T�¥zc�S o S®©j`�u²]�eq�5�5rwY[�q�>Y s SZT@]�e {�{ o rw¥zc�UO¥zc s efclµ°}tS�]_T¢b�S�T { S g ]_efY^] o S�T g b�rL]�XZbtSZT�v s U+]_rw¥zc�S�u]�ef`[r o r�]_U S �¡�5�WU S �¡�[�VU ¤Ñv�efY�T g S g efTZ¤ o S�}tS�]�SZTt]&v�rL]ªU�]�rw¥zc�S�]_ef` o S � |5c�]�eq�5�^ef` o S ��i �=|5c�b�Ö�]_btSU�]�rw¥zc�S�]_ef` o Sf¤ o S¢}tS�]�v�|5r�]y¤�S�Y^]_b�S­efcl]_b�S�TZ¤¸eyW5|5rLb>c�Y�S°rw\ { c o T�rL|5YV]_b�efY�T@W5SZbtT�S­T�c { UZbtrwS�c�b�S­¯ �~¦�°S²±�¤qÖ+]_btS®v�efY�T o S�btUZ�5rL|5Y |ηjet| < 2.5

¤ÒS�]�Ö+]_btS>efT�Tt| g rwU�¯�efc�\/|5rwY�TÑv�S�clµ�]�b_e g SZT»v[S®`�|fY�Y�SZT¥zc�e o r�]_U�T i§ Ya�5UZY[UZb_e o ¤ o s U�]�rw¥zc�S�]_ef�5S�v�S�TÑ}tS�]�T�v�S�`aSZT@]®Sl��S g ]_c�U�e¡WfS g c[Yab�U�T�Syeqcav�S�Y[SZc�bt|5Y�SZT®efv�e { ]�U� v�r�] ê�ê u²]_ef�5�5S�b � S �¡�5kWU S �¡�5nWU i � s c[Y { |5rLYz]®v�S�W�c�S8�5U�Y�UZb�e o ¤ o S�btUZT�SZefc;v�S�Y�S�c�b�|fY�SZT�SZT@]�c�Y\1|�v�X o Spv�S g e o g c o ¥zc�r g |5\&`�rLY�Spv�S�\1efY�rLXZbtS�T@]�eq]�rwT@]_rw¥zc�S { o c�T�rLSZc�btT=Wqefb�rwef` o SZT0v s SZY^]_btUZS®v�eqY�Tc�Y�S8Wqefb�rwef` o S�v�S°T�|5b@]_rLS i � o S�Tt]�c[]_r o rwTtU { |5c�b g |fY�Tt]�b�c�rLb�S°c�Yxv�rwT g b�rL\1rLY�efY^]>¥zc�r { SZbt\1S+]�c�Y�ST�U { efb_eÒ]_rw|fY¹SZY^]_btS1c�Y¶Ttrw�5Y�e o S�]°c�Yî`�btc�rL]8v[S h |fY�v i R-S ê�ê u²]�eq�5�5SZb8cl]_r o rwTtU { btSZY�v g |5\/\/SWqefb�rwef` o S>v s S�Yz]�b�U�S o S�T¢btUZT�c o ]�eÒ]_T�v[S�]_bt|5rwT�e o �5|5btrL] � \1S�T�¥�c[r�c[]�r o rwT�S�Y^] o SZT�rwY h |fb�\1eq]_rL|5Y�T o rLUZS�T¯ o e o |5Y��5c�S�v�c�b�U�S>v�S>W�rwS®v�S�Tp¥�c�efb � Tp`;à^R s e o �5|5btrL] � \1S¢��±�¬ � ��S g |fY�v�efb@d&±pSZb@]_S+µ&¬¾eq�5�5SZb �S �y�f�pU S �¡�^¦WU ¥zc�r�SZT@]¾`�eqT�U�Ttc�b o e�b�S g |5Y�T@]_b�c g ]_rL|5Y�v[SZT=WfSZb@]_S+µªTtS g |fY�v�efrLb�SZT�¤qS+] o SZT=e o �f|5b�r�] � \/SZT«5R-�j� � «fS�]�R-� h S�]�rw\/S7�pbt|5`�ef`[r o r�](d � S �¡�f��U S �y�^£�U S�] � �l�j� � � |fc�Y^]_rwY[�¹�lrL�5Y�SZvî�(\ { e g ]ª�=eÒub_ef\/S�]�SZb � S �¡� � U S �y� � U ¥zc�rpc[]_r o rLT�SZY^] o S�T { efb_eq\1X+]_b�S�T°v s rL\ { e g ]­v�S�T­]�b_e g SZT­v�SZT>}tS�]_T i � o eT�|5b@]_rLS�v�c ê�ê u²]_ef�5�5S�bZ¤ o S�}tS+]°SZTt] g efb_e g ]_U�b�rLT�U7eyW5S g c�Y¶Y�|5\&`�btS g |f\ { btrwT�S�Y^]_b�S � S+] � ¤íS+]

�~k5k

Page 124: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

�% u¡¢( £li��¡n � � g�� UZ\1e�v�S�T { b�| { b�rLU�]_U�T g efb_e g ]_U�b�rwT@]_rL¥�c[SZTVv s c�Y�}tS+]av�S�` i � |fYz]�b_efrLb�S�\1S�Yz]efclµ°}tS�]_T o U��5SZbtTZ¤ o SZT�]_b_e g SZT�b�S g |5Y�T@]_b�c[rL]_S�T®v�cª}tS+]®v�S�` { b�|¡W�rwSZY[Y�SZY^]>v�caWfSZb@]_S+µaT�S g |5Y�v�efrwbtS� �lS g |5Y�v�efbtdº±pS�bt]�S+µ �+i � S7v�S�b�Y�rLSZb�S�Tt]­v�rLTt]�eqYz]�v�cîWfSZb@]_S+µ { b�S�\1rLSZb � �pbtrw\1efbtd;±pS�bt]_S�µ � v[SR

xyi v

0SZT@] o S { efb�ef\/X�]_btS8v s rw\ { e g ] i

o S�}tS�]ªb�S�T�TtSZ\&` o SZb�exv s efc[]_efY^] { o c�T­¯;c�Y;}tS+]ªv[S1` � btSZT {íi }tS+] o UZ�5S�b � ¥zc�S g S/Y�|5\&`�btS7T�SZb�e{ b�| g�� S�v[S � � b�S�T {il�^�+i[· YVv�U+Þ�Y�r�]�v�|fY g v�S�T { |5rwY^]_T�v s | { UZb_eÒ]_rw|fY¤ gfs SZT@]tuj¯~u(v�rLb�SOc�Y�S�Wqe o SZc�bb�SZ¥zc�rLT�S1v�S o e;Wqefbtr ef` o S�v�rwT g btrw\/rwY�efY^]�S�¥�c[r g |5b�btSZT { |5Y�vܯ o e { bt|5`�ef`�r o r�]_U�¥zc�S o S8}tS+]�Tt|5rL]U�]_rL¥zc�S�]�U iÍ£ Yº}tS+]�SZT@]7U�]�rw¥zc�S�]�U;R-|l|5TtS � |5cÛRôà g |5c { c�btS o ä g�� S � Ttr o e�Wqefbtr ef` o SVv[S$T�|5b@]_rwSv�c ê�ê u ]�ef�5�fSZb { |fc�b g S®}tS�]OSZT@]�Ttc { U�b�rLSZc�btS�¯ �[imkf�[i R-S®}tS�]OT�S�b_e1U+]_rL¥�c[S�]_U°±pSZb@d;¬>rw� � ] � |fc±�¬ à g |5c { c[b�S�]�b�XZT�T�SZbtb�U�S � Ttr g S+]�]�S&\1Ö�\1S°Wqefb�rwef` o SªS�Tt]8Ttc { U�b�rLSZc�btS&¯ �[i � ¦li ê |q]_|5Y�T�¥zc�So s S�Ý g e g rL]�U/v s U+]_rw¥zc�S+]�ef�fS1v�c { |frwY^]°v s | { U�b_eq]�rw|5Y � Y[|f]_U · � à ·8{ SZb�eq]_rLY��x�=|5rLY^] � ±�¬ � R �SZTt]pv s S�YzW�rLb�|5Y � � ï � £fk5ï7� S�]�¥zc�S o S¢]�efclµ&v�S>\1efc[WqefrwTtS�rLv�SZY^]_r�Þ g eÒ]_rw|fY&SZT@]pv s S�Y^WlrLb�|5Y �[im¦5ï� ¦5ï7� ¤ g�hji Þ��5c[b�S £li��y�[iX�+�X,+�Y ¥cAÎÊ ¼ 9J7>Ì>Ì>;03BÌI?47>3BC_PV©�7>347>P«ª¢CJA

ZH��efY�T g S�]t]_S�efY�e o d�T�S�|5Ú o S ç rL�5�5T�TtS�v�U�T�rLYz]�XZ�5btS�SZY

bb¤ o S�T�U+W5X�Y�SZ\/SZY^]_T

Z + jetso UZ�5S�b�T

g |5Y�T@]_r�]_c�S�Yz] o S�`�btc�rL]¢v�S h |5Y�vVv[|5\1rLY�efY^] o |5btT¢v[S o e { btU+u²T�U o S g ]_rw|fY i R0S�T0}tS+]_T�v[S�`a|fYz]¢v�|5Y gU�]_UVU�]_rL¥zc�S�]�UZT�eyW5S g o ex\1U+] � |�v�SVv[cÜ`lu²]_ef�5�5rLY��áv[U g btrL]�S g rëu(v�S�T�Ttc�T i ��SZclµ�]_| { | o |5�5rwS�T°|5Y^]U�]_U8cl]_r o rwTtUZSZT�à o e { b�S�\1rLXZbtS g |fY�T�rLTt]_S°¯&TtU o S g ]�rw|5Y[Y�SZb o SZT®U+W5X�Y�SZ\/SZY^]_T�eyW5S g efc$\1|frwY�T¢v�SZclµ}tS�]_T°v�S7`¶U�]�rw¥zc�S+]_UZT g�� e g c�Y�e¡WfS g o S { |5rwY^]8v s | { UZb�eq]_rL|5YîR-|l|5TtS � Y�|q]_U k R � å o eav�SZclµlrLXZ\/Sg |5Y�TtrwT@]_S1¯�T�U o S g ]_rL|5Y�Y�S�bZ¤ { efbt\1rLT o SZT­U�WfXZY�S�\1S�Y^]_T�¥zc�rpY�S o s |fYz] { eqT�U�]�U { b�U g UZv�S�\1\/SZY^]Z¤g SZc�µ�eyd^eqYz]pc[Y&T�S�c o }tS+]�v�S®`&U+]_rL¥�c[S�]_U®e¡WfS g o S { |5rwY^]¾v s | { U�b_eq]�rw|5Y­±pSZbtdª¬>rw� � ] � Y�|q]_U � ±�¬ �+i�¾efb o eaT�c�r�]_Sf¤ o SZT°eqc[]_btSZT°U�WfXZY�S�\1S�Yz]�Tª¥zc�r�Y s |5Y^] { eqT­U+]_U�TtU o S g ]�rw|5Y�Y[UZT°T�S�b�|5Y^]­b�S(}tS�]_U�TZ¤-S+]o SZT>v[SZclµxU g�� efY^]_r owo |fY�T � ±�¬NS�] k R�¤�rLY�v�U { S�Y�v�efY^]_T�¤ T�SZbt|5Y^]�efY�e o dlTtUZT�T�U { efbtUZ\/SZY^] i

�¡kfn

Page 125: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

�% u¡¢( £li��y� � § Ý g e g rL]_U�v s U�]�rw¥zc�S�]_ef�5S¢v�SZT�}tS�]_T � `luj«fS�] § Ý g rwS�Y g d � v�S¢`�S�Y h |5Y g ]_rw|fYªv�cª]�efclµv�Sá\1efc[WqefrLT�Sxrwv�S�Y^]_rLÞ g eq]�rw|5Y � � e � Sá��eÒ]_S � ¤ { |5c�b o s e o �f|5b�r�] � \/S$v s U�]_rL¥zc�S�]_ef�5S¹«5R-�j� T�S�c o� g |5c�b�`¸S8v�c;`�efT�¤�SZY;W5S�bt]�S � S�] o S�b�U�T�Syeqc�v�S8Y[SZc�bt|5Y�SZT � g |5c�bt`�S8v�c � eqc[]y¤�S�Y;` o S�c�S � ¤ { |fc�b]_|5c[T o S�Tp}tS+]_T�v�S {

T | �~¦ �8S²±×T�Sª]_b�|fc[WqefY^]�v�efY[T�]_|5cl]_SZT o SZT�b�U��5rw|5Y[T�v�c¹v�U+]_S g ]_S�c�b i R-SZT{ |frwY^]_T=v s | { U�b_eq]�rw|5Y�R0|�|5TtS � · �¶R � S�]=±pSZbtd�¬>rw� � ] � · �º±�¬ � Tt|5Y^]�UZ�^e o SZ\/SZY^]¾b�S { b�UZTtSZY^]_U�T i

��Ã�Ù/ÇÑθËÑËdazÃ�Ù�=|5c[b&U�]�rw¥zc�S�]�SZb o SZT>}tS�]_T�v�SZT�v�|fY�Y�UZS�TZ¤ o e { bt| g UZv�c[b�S$v�c ê�ê u²]_ef�5�5S�b&¯áv[rwb�S g ]�SZ\/SZY^]�U�]�Ue {�{ o rw¥zc�U�SªTtc�b o S�Tp}tS+]_T�]_ef�5�^eq` o S�T i R-|5b�T�v�S o e7b�S g |5Y[Tt]_btc g ]�rw|5Y¹v[S o e/\VeqT�T�Sªv�c¹`¸|5T�|5Yáv�Sç rL�5�5T­v�efY�T o SZTªv�|5Y�Y�U�SZT �

H → bb � ¤=Ttr o S�T�U+W5XZY[SZ\/SZY^]_T7Y s |5Y^]�¥zc s c�Y�T�S�c o }tS+]�U�]�rw¥zc�S�]�U±pSZb@dº¬>rw� � ]Z¤-e o |5b�T o SO}tS�]­Y�|5Y¶U+]_rw¥zc�S+]_U7v�S { o c�T � efc[]�S�rw\ { c o T�rw|fYá]_b�efY�TtWfSZbtT�S/SZTt]­c[]�r o rwT�Ug |5\/\/S8T�S g |5Y�v/}tS+] i �lr o S�TOU+W5X�Y�SZ\/SZY^]_T8|fYz] { o c�T�v�S�v�S�clµ�}tS�]�T�U+]_rw¥zc�S+]_U�T�R-|l|fT�Sf¤¸e o |5b�T o Sg�� |5rëµ { |5bt]�S­Ttc�b o S�T>v�SZclµ&}tS+]_T�U�]�rw¥zc�S+]_UZTOR-|�|5T�S°v�S { o c�T � efc[]�S°rw\ { c o Ttrw|5Y1]_b_eqY�TtWfSZb�TtS i��Ì�ÙyÊweÏ�=ÓGÌ[Å~ÊGθËÛÃ^ÅVÓ"Ã��ÑÄp�ÑÊ Å/ÇÑÃ�� Î�ËÑÇ"eÏ�=Ó Å~ÊÐ}ZÃ^Å� |5\/\1S o e>T@]�eq]�rwTt]�rw¥zc�S�v�SZT=U�WfXZY�S�\1S�Yz]�T�T�rL\&c o U�T0S�]=v�S�`�btc�rL]�T0v�S h |5Y[v�\&c o ]_rð}tS�]_T-S�Tt] h efrw` o Sf¤efc o rLSZc$v s c[]_r o rLT�SZb o S ê�ê u²]_ef�5�5S�bZ¤l|5Y�cl]_r o rwTtS�c�Y�S h |5Y g ]_rL|5Y$¥zc�r g e o g c o S o e { b�|5`�ef`�r o rL]�U�¥zc�So S�T}tS+]_T�]�ef�5�5ef` o S�TpT�|5rLSZY^]�U�]_rL¥zc�S�]�UZTZ¤ { c�rLT o S¾}tS�]¢SZTt] { |fY�v�UZbtU { efb g S�]t]_S { b�|5`�eq`�r o rL]_U i � rwY�Ttrefc g c�Y$U�WfXZY�S�\1S�Yz]�Y s S�Tt]>btSj}tS�]�U°efca\/|5\/SZY^]�v[S o s U�]�rw¥zc�S�]_ef�5S i � S+]�]_S h |fY g ]�rw|5Y1SZTt]>e {�{ S o U�S¬�� � � |5c¹¬=ef�$�Oeq]_S � |fY g ]�rw|5Y¤ { |5c�b h |fY g ]�rw|5Yºv[S�]�efc�µ¹v s U�]�rw¥zc�S�]_ef�5S � ¤íS+]8S oLo SªSZTt] { efb_e~u

�~kq�

Page 126: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

\1U+]_b�U�S�S�Y h |5Y g ]�rw|5Y1v�S {T

S+]η

v�c­}tS�] i � o { S�c[]�efrLY�T�r�dVeyW5|5rLb { o c�T�rLSZc�btT h ekÑ�|5Y�T®v[S g�� |5rLT�rLbv�SZclµ/}tS�]�T8U�]_rL¥zc�S�]�UZT­R-|l|5TtSf¤|fc¹c�Y¶T�SZc o }tS�]°U+]_rw¥zc�S+]_U&±pS�btdº¬>rL� � ]8v�efY[T o SZT8U+W5X�Y�SZ\/SZY^]_T i· Y { SZc[]Ov�U�\1|fYz]�b�S�bO¥zc�S S �5�¡�pU à

− Tt|5rL]Li

�Lj

� o e { b�|5`�eq`�r o rL]_U$¥zc�S o S&}tS�]i

�j � T�|5r�]VU+]_rL¥�c[S�]_UáR-|l|5TtSf¤¢e o |fb�T { |fc�bVc�Y[S

g |5\&`[rwY�efrLT�|5Y1 ≤ i < j ≤ n

¤=|5Ún

SZTt] o SVY[|5\&`�btSVv�S­}tS+]_T&v�efY�T o s U+W5XZY[SZ\/SZY^]7S�]i

S�]j

btS { btUZT�S�Y^]_SZY^] o s |5btv�b�S&v[SZT�rLY�v�r g SZT�v[c {T

v[SZT�}tS+]_TZ¤ o e { bt|5`�ef`[r o r�]_U°v�S�TtU o S g ]�rw|5Y�Y[SZb�c�Y[Sg |5\&`[rwY�efrLT�|5Y$v[S­v[SZclµ�}tS+]_TOR-|l|fT�S°SZT@]�v[|5Y�Y�U�S { eqb8à

p(i, j) =LiLj

(1 − Li)(1 − Lj)

j∏

k=1

(1 − Lk).� £�imn^�

− o e { bt|5`�ef`�r o r�]_U®v�S�TtU o S g ]�rw|5Y�Y[SZbpc�Y�S g |5\�`�rwY�eqrwT�|fY/v[SOv[SZclµ�}tS+]_Tp]_S o ¥zc�SOc�Y1T�SZc o }tS+]�T�|5r�]U�]_rL¥zc�S�]�U°±pS�btd$¬>rL� � ]�SZT@]�v�|fY�Y�UZS { eqb8à

p(i, j) =

( n∏

k=1

(1 − Lk)

)(

Tj

1 − Lj

+ δj2 .T1

1 − L1

)

. δi1,� £�i��z�

TiSZT@] o e { bt|5`�ef`[r o r�]_U�¥zc�S o S�}tS�]�T�|frL]OU�]�rw¥zc�S�]�U­±pS�btd;¬>rL� � ]�S+]

δijWqefc[] � ¥zc�efY[v

i = jS+]

� eqc[]_btSZ\/SZY^] iX�+�X,+.- [\<Í5858A^É9J;=<>3�?BAÒPV©w2Q9J;=Ó�N4AQ9J7ÍÊÔ;=P=;�9J2�?BAC�¦¨AQ9JC

R s U�]�rw¥zc�S�]_ef`�r o rL]�U�v�S�T�}tS�]�T � |5c�]�eqclµ�v s U�]�rw¥zc�S+]�ef�5S>v[SZTí}tS�]�T �¾g |fb�b�S�T { |5Y�v�eqYz]�eqc/b�e {�{ |5bt]SZY^]_btS o S�Y�|5\&`�btS�v�S�}tS�]�T®U�]�rw¥zc�S�]_ef` o SZT�S+] o SOY�|5\�`�b�SO]_|f]_e o v[S�}tS�]�TZ¤�e­U�]�U g e o g c o U { |5c�b o S�Tv�|5Y�Y�U�SZT�S+] o e/T�rL\&c o eÒ]_rw|fY i � |5\/\1S o S­]�efclµ�v�S�}tS�]�U+]_rL¥�c[S�]�eq` o SªSZTt]�\1S�r owo SZc�b�v�eqY�T g S+]�]�Sv�SZbtY�rwX�b�Sf¤�r o SZT@] g |5b�btrw�5U;eyW5S g c�Y h e g ]_SZc[b1v s U g�� S owo S { |5c[b/¥zc�S�T_e¹Wqe o S�c�b7T�|5r�] o e¹\1Ö�\1S¥�c[S g S owo S8v�SZTOv�|5Y[Y�UZS�T i R0S h e g ]_S�c�b�v[S g |5b�btS g ]_rw|fY g |5b�btSZT { |5Y�váefcxb_e {�{ |5b@]�SZY^]_btS o S�]_efclµv s U+]_rL¥�c[S�]�eq�5S�v�S�Tp}tS+]_T�v[SZT�v[|5Y�Y�U�SZT�S+] g S o c[r=v�S o e/T�rL\&c o eÒ]_rw|fY¤[S+]�r o e/U�]�U { efb�ef\/U�]_btUªS�Yh |5Y g ]�rw|5Y�v[S {

T

S+]η

v�c�}tS+]y¤^efrLY�T�rl¥zc�S�v�S o e { |5TtrL]_rL|5Y&Ttc�rLWqefY^] o s eÒµlSz

v�c�W5S�bt]�S+µ { btrw\1efrwbtS i� ù0Õ �@�ý6��)V�����Hl�y�;ý �$ü ¹,�y����'º» �ü �xÖ��)��ý þ��Hl¼½�$ü��d�x¾ªü �$ü�ý

�íü��ÑýT�$ü¿�� { b�X�T o S�T�U�]_e { S�T�v�S o e { btU+u(TtU o S g ]�rw|5Y � g�hji£li k�imnf� ¤ív[SZT8v�r*�íU�b�SZY^]�SZT g |fb�b�S g ]�rw|5Y�T�e {�{ o r�u

¥�c[UZSZT�¯ o e­Ttrw\&c o eq]_rL|5Y � g+hjil£limnli kq� ¤zv�S o e°T�U o S g ]_rw|fY1v�cV`�b�c�r�]�v�S h |fY�vV\&c o ]_rð}tS�] � g�hjil£li´�^� ¤zS+]e { b�X�T o s U�]�rw¥zc�S+]�ef�5S­v�S�T�}tS�]�T�v�S�`¹S�Yºv�S�clµ o |f]_T � ±�¬KS+] k R � g�hjií£li £�i k5� ¤�Y[|5c�T g |5Y^]_b ÷ o |5Y�Tv�S°Y�|5c[WfSyefc o s e gZg |5b�vxSZY^]�b�S o S�T>v�rwT@]_b�rL`�c[]�rw|5Y�T�v�SZTOv�|5Y�Y[UZSZTOS�]Ov�S o e&T�rw\�c o eq]�rw|5Y iR0S�T&]�ef` o Syeqclµ £�i £ S+] £li �º\1|5Y^]�b�SZY^] o SVY�|5\�`�b�Sav s U+W5XZY[SZ\/SZY^]_T1T�U o S g ]_rw|fY�Y�UZT { |5c[b&v�r���U+ub�SZY^]�SZT g |5c { c�b�S�TZ¤ b�S�T { S g ]�rLWfSZ\/SZY^] { |5c�b o s eqY�e o d�TtS

eeS+]

eeicr ¤ { |fc�b o S�T���c�Y�T��t�je7S+]O���(` iRÑe/Þ��5c�btS £li��~¦ \/|5Y^]_b�S o e/v�rwT@]_b�rL`�c[]�rw|5Y�v�S o e/\VeqT�T�S�rwY^Wqefb�rwefY^]_S­v�SZT�v[SZclµ/}tS�]_T { |5c[b g S�Tv�SZclµ o |f]�T � ±�¬éS+] k R i �=|5c[b�e¡Wf|5rwb { o c�T>v[S8Tt]�eÒ]_rwT@]_rL¥�c[S�S�]�v�|fY g \1rLSZclµ°}tc��5S�b>v�S o s e g�g |5btvSZY^]_btS o SZT�v�|5Y�Y[UZSZTOS�] o e�Ttrw\&c o eq]_rL|5Y¤ o S g efT�|fÚ o SZT�¥zc�eq]_btS�eqY�e o d�TtSZT � g+hji¸£5� ee

¤eeicr ¤ µµ

¤S�]

µµtrk |5Y^]�U+]_U g |f\&`�rwY[UZSZT�TtSZbt]Ov s r oLo c�T@]_b�eq]_rL|5Y i

�¡k5¦

Page 127: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

� Y�e o d�T�See

��c�Y;���je�(Y g o c�TtrLWfS k }ju(\�c o ]�r }tS�] k }ju { btS�]_ef� � ±�¬ k R��eq]_e �f� �~k � �5�zkq� n^£5£l� �f� �^���oLo ` � � � � kf�5� ± �~¦q� �zk5kq� ± kf£ n5�f�f� ± kf� � ��i´� � ± �[im¦5£ �5��i�n � ± �[i�n[�

¨ c o ]_r }tS+] �¡� � £5£ ± �5�¡£ �¡�5�[� ± kÒ� �[� � ± �~£ �¡n[i��^k ± �[i´�^� ��i´�^� ± �[i��y�Zjj £ � � � � ± � n k5£5kfn ± �~k kf�l�¡� ± �¡� � � i � �5� ± �[i��5�^¦ � i � �^� ± �lim�^k �Zbb ¦5¦f�[im£ ± kli´� �5�¡£lim� ± �fi k �5�~klim£ ± �5imk n5�[imkfn ± �[i�n5� �¡�[i��5� ± �[imk5¦Zcc �~¦f�q��i�� ± ¦�i�� kq�^¦lim¦ ± kli´� k5¦fnli ¦ ± kli�n �~¦li � � ± �[i�� � £limnq� ± �liL�¡�ZZ n5�[i��¡n ± �[i�n[� �~¦�iL� � ± �li k5k �y��i � � ± �[i kfk �5iL� � n ± �[i��5n5� �5i��~¦5k ± �[i��f���WZ �^�[imkq� ± �[im¦f� �~£�i £ � ± �limn^£ �~£limk5£ ± �[imn5£ �[im�q�zk ± �[i��^k5k �[imkl� � ¦ ± �[i��5�^£ �WW �^�[i´� � ± �[im¦q� kli��5� ± �liL�¡n �5i � k ± �[iL�f� �lim�f�5�[� ± �[i��5�f� � �[i��[�~¦ � ± �[i��5�^kqntt k � im¦fn ± �[i�� � k5k�i �5� ± �[i��¡� �¡¦li £f£ ± �[iL�yn ��i��^£l� ± �[i��f�^� �[imkf�5� ± �[i��^¦ �ZH

� �5�¡¦5� �li �5� �f� ± �[i��5�^¦ � �[i�� � �~£ ± �[i��5�^¦qn �[i��^£l� � ± �[im�f�^¦5k �liL� �f�5� ± �[i��5�[�~¦ �[imkq� � � ± �[i��5�^kfk

� Y�e o d�T�See

�Oc[Y�T����(`�(Y g o c�T�r�W5S k }ju(\�c o ]�r }tS�] k }ju { b�S+]�ef� � ±�¬ k R��eq]�e n5�^£f�5�5¦ �y�5�[� � � �~¦5¦ kfk � �y� �

��owo ` � � n5�f�z£fn � ± �^�^¦ � � �[� ± ¦ � £ � �5n ± �z£ kl�¡nlim� ± �5i�n �¡n5�li � � ± �[i �f�¨ c o ]�r }tS�] � �[� � n ± kf�5� n^¦ � � ± �z£ kf�5n^£ ± n[� � � i � � ± �[im£ � kf�liL�¡n ± �li��^�Zjj kf� � �5£fn ± n5�f� ¦5k5¦ � ± n5¦ ¦f�^k5£ ± n5¦ n^£�i � £ ± �[imkf� k � i £f£ ± �[iL� �Zbb �y� � �5i � ± �[i�� k5¦ � imn ± kli � kq� � imn ± kli � £f�[imkl� ± �[i � � ���fi k � ± �lim�^£Zcc n �f� k ± �~¦ ¦q�5�[i � ± ¦li � ¦qnf��i � ± ¦�i £ �^�li��z£ ± �li ¦f� kl�5i��~k ± �[i k �ZZ

� kli kq� ± �li �5� n5n[i��¡n ± �li ¦5£ n^kli��y� ± �[im¦f� kli��5�^£ ± �[i�� � � k�im�5� ± �liL�5�WZ �f�5�5i�� ± �5i ¦ n � im¦ � ± �li � � n � i � � ± �[i � � �5i��5�5� ± �[i��^¦ � �[i�� � £ ± �lim�^kÒ�WW �yn[�5i � ± kli � �[i�n � ± �[i��5n ��i��~k ± �[i´� � �[i��y�z£ ± �[i��5n � �[i��^£ � ± �lim�^kf£tt

� nli k5k ± �li ¦5k ¦ � i � � ± �[i´�^n �^�[i��[� ± �[i�n5� �5�5i�� � ± �[i��5� �¡¦limnf� ± �liL�~¦ZH

� �5�~¦5� kli´�z£5¦ ± �lim�^kq� �5im£5¦q� ± �[i��[�~£ �5i £fk5¦ ± �[i��[�¡� �[i�� � kq� ± �[i��5�f� � �[i��5n5n^£ ± �lim�5�f�5�#%$'&)( £lim£ � ê |5\&`[b�Sáv s U+W5XZY[SZ\/SZY^]_T;v�efY[T o s efY�e o d�T�S

ee { |5c[b o S�Ta��c�Y�Ta�t�je � S�Y � efcl] �S�]/���(` � S�YÈ`�efT �&{ |5c�b;à o S�T/v[|5Y�Y�U�SZT � ��eq]_e � ¤ o eºT�|5\/\/Sa]_|5c�T o SZT7`�b�c[rL]_T7v�S h |5Y[v � ��owo` � � � ¤ o S&`[b�c�r�]�v�S h |5Y[vî� � � � ¨ c o ]�r }tS+] � ¤ o S�T�v�r*�íU�b�SZY^]�T8`�b�c�r�]_T�v[S h |5Y�v¶T�U { efbtUZ\/SZY^]y¤S+]o S�Ttrw�5Y�e o

ZHTtrw\&c o U { |5c�b>c�Y�S°\1efT�TtS°v�S �5�~¦ �8S²± i ©(�(Y g o c�T�r�W5S+� g |5btb�S�T { |5Y�v�efc;Y�|5\&`�btS

v�SZTpU+W5XZY[SZ\/SZY^]_T>e { b�X�T�¥zc�S o S�T g |5c { c�b�S�T¢v�S o e { b�U+u²T�U o S g ]_rL|5Y/efrwS�Yz]�U+]_UOe {�{ o rw¥zc�U�SZTå^r o Y s de { efT�v�S g |5Y[v�rL]�rw|5Y�T�c�b o S&Y�|5\�`�b�Sªv�S�}tS�]�TZ¤íY[r¾T�c[b o e1\1efTtT�S&v�c¶`¸|5T�|fYî½ i © k }ju(\&c o ]_rð}tS�]@�g |5btb�S�T { |5Y�v$efcVY�|5\&`�btS�v[SZT®U+W5XZY[SZ\/SZY^]_T>v�S o e { b�U�u(T�U o S g ]_rL|5Yaeyd5efY^]�efca\/|5rwY[T�v[SZclµ°}tS�]�Tår o Y s d1e { eqT�v�S g |5Y�v[rL]_rL|5Y/T�c�b o e°\VefTtT�S�v�ca`¸|5T�|5Ya½ i © k }ju { b�S+]�ef�q� g |5btb�SZT { |fY�v$efc1Y�|5\&`�btSv�SZT�U+W5X�Y�SZ\/SZY^]_T1v�S o e { b�U+u²T�U o S g ]_rL|5YÛeyd^efY^]1efcÛ\1|frwY�T&v[SZclµá}tS+]_T�¤»S�]7|5YÛv�S�\VeqY�v�S$¥zc�S60 < Mee < 150

�8S²± i © � ±�¬��&SZT@] o S&Y�|5\�`�b�S7v�S�T­U+W5X�Y�SZ\/SZY^]_TªY s e¡d5efY^]­¥�c s c�Y�T�S�c o }tS�]U�]�rw¥zc�S�]�U�±pSZbtd°¬>rL� � ]0S�]¾efc g c�Y�eqc[]_btS�U+]_rL¥�c[S�]_U¢R-|l|fT�S i © k Rí��S�Tt] o SpY�|5\�`�b�Spv�S�T=U+W5XZY[SZ\/SZY^]_Teyd^efY^]�efc;\1|frwY�T>v�S�clµ�}tS+]_TOU�]_rL¥zc�S�]�UZTOR-|l|5TtS i

�~kf�

Page 128: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

� Y�e o d�T�Seeicr �Oc[Y��t�je

�(Y g o c�TtrLWfS k }ju²\&c o ]�r }tS+] k }ju { btS�]_ef� � ±�¬ k R��eq]_e k5£fn[�5� �¡�^¦f� � n5¦ kf� n��oLo ` � � kf�5� � � ± �5¦ � ¦l�5i � ± � i � �5� �[im¦ ± £li�� � � i ¦5k ± �[imkl� � i�� � ± �[i��y�¨ c o ]_rð}tS�] � � ¦q� ± � � � �[imk ± £�iL� �z£li � ± ¦lim¦ �[i��^k5£ ± �[i��^£5£ �[im¦f�^¦ ± �[i��5�f�Zjj kq�zkfn � ± �f� £f¦f�[i�� ± ¦li�n £5kfn[im¦ ± ¦li�� ��i � £q� ± �lim�5nl� klimkf� � ± �[i��[�y�Zbb �y� � im� ± �fi k nf�[i ¦q� ± �li ¦ � k � i��y� ± �[im¦f� £�i ¦5k ± �[i��~£ n[i´�5� ± �[i��¡�Zcc �^�f�[i � ± klim� £f�[im¦ ± �5imk �^£�imn ± �5imk n[i � � � ± �[im� � � �5im£5¦fn ± �[i��f� �ZZ

� i´�^� ± �[i��¡� �[i kf� ± �liL�~k ��i��5� ± �[i��~k �[i�n^k5¦ ± �lim�^kq� �[i�nf� � ± �[i��^k5£WZ �5�fi � � ± �[imk � �[i � ¦ ± �liL� � ��i��^£ ± �[i�� � �[i��¡�^kf� ± �lim�5� � n �[i��^¦fn^£ ± �[i��5�^k �WW �~k�im�^£ ± �[imk5£ �[i��f�z¦ ± �lim�5�fn �[i��^k � ± �[i��^¦5k �[i��[� � n ± �lim�5�5¦f� �[i��[�~k5£ ± �[i��5�5�^£tt �[imkq� � ± �[i�� � k ��i � �^¦ ± �[i��^£5k nli ¦fn5k ± �[i��5�[� �5i��5�5� ± �lim�[� � �5i�n5�5n ± �[i��^kf�ZH

� �f�~¦5� �[i kq�5n � ± �[i��5�^k � �[i��¡�5�5� ± �[i��5�^kf¦ �[i��~¦q�^¦ ± �[i��5�^kq� �[im�q�^nf�zk ± �lim�5�f�^£5k �lim�^¦qn5n5� ± �[i��5�5� � £

� Y�e o d�T�Seeicr ��c�Y�T����(`

�(Y g o c�TtrLWfS k }ju(\�c o ]�r }tS�] k }ju { btS�]_ef� � ±�¬ k R��eq]_e �5¦l�5� � � � � n �¡�^£f� � � n^£��oLo ` � � �f�5n^k � ± �¡� � �~£l�~k ± � � �~¦f�5£ ± � � ���5i��¡� ± �[im¦l� k5£li�� � ± �[i�n^£¨ c o ]_r }tS+] �q���¡� ± �5n kfn5£li � ± � i � �~¦5¦li´� ± £li�� ��i��5� ± �[imkf� kli��~£ ± �[i��¡�Zjj ¦q�^¦l�¡� ± �~¦q� �~k5¦ � ± �¡� �~kq� � ± �¡� � imkl� ± �[i��~k £li�n5�5� ± �lim� � �Zbb n^¦l�5i � ± kli � ¦ � i £ ± �5i�n ¦f�[i�n ± �5imn �~¦li´�z£ ± �[i�n � � im¦q� ± �[i�n[�Zcc

� ¦5£�im� ± �li ¦ �¡kf�[im£ ± kli�� �~kf�lim� ± klim¦ � i��[� ± �[imkl� ��i £�� ± �liL�¡nZZ kf�[i��y� ± �[i´�zk £lim£f� ± �li kf� £li�n5� ± �[i kq� �[i ¦ � n ± �[i��f�zk �[i�� � � ± �[i��5�^kWZ k � i � � ± �[im£l� � im£f� ± �li���� � i�n[� ± �[i��5� �[imn5£f� ± �[i��^k5k �[i��~¦f�5� ± �[i��5� � �WW k � i � ± �5imk �5im¦fn ± �limn5n �[i � � ± �[i kq� �[im�5kl� ± �[i��[�5� �[i��5�5�^¦ ± �[i��5�^kf¦tt �~¦limk5k ± �[imkl� �5�fiL�y� ± �[i�� � � iL�yn ± �[iL�¡¦ klimn5kfn ± �[i��f�z¦ n[i��5�~£ ± �[i��5�f�ZH

� �5�¡¦5� �li ¦5kq�f� ± �[i��5� � ¦ �[i�n5�^£ � ± �[i��5�^£fk �[i�n^¦fn5� ± �[im�f�^£l� �liL�¡�f� � ± �[i��5�^kl� �[i��~k � � ± �[i��5�^k �#%$'&)( £li � � ê |5\&`�btSáv s U�WfXZY�S�\1S�Yz]�T$v�efY�T o s efY�e o dlTtS

ee { |5c�b o S�Ta��c�Y�Ta�t�je � S�Y � efc[] �S�]/���(` � S�YÈ`�eqT �&{ |fc�b;à o SZT7v�|fY�Y�UZS�T � ��eq]_e � ¤ o e¶Tt|5\/\1SV]�|5c�T o S�T�`�b�c�r�]_T7v�S h |5Y�v � ��owo` � � � ¤ o S&`�btc�rL]�v�S h |5Y�vî� � � � ¨ c o ]�r }tS�] � ¤ o S�T�v�r���UZbtSZY^]_T8`[b�c�r�]_T�v�S h |fY�v¹T�U { efb�U�\1S�Y^]y¤S+]o S�Ttrw�5Y�e o

ZHT�rL\&c o U { |5c[b>c�Y�S8\1efT�TtS­v[S �f�~¦ �°S²± i ©j�(Y g o c[T�rLWfS+� g |5btb�SZT { |fY�váeqcxY[|5\&`�btS

v�SZT�U�WfXZY�S�\1S�Yz]�T®e { b�XZTp¥zc�S o S�T g |5c { c[b�SZT�v�S o e { btU+u²T�U o S g ]_rw|fY1eqrwSZY^]�U�]�UOe {�{ o rw¥zc�UZS�Tåzr o Y s de { efT8v�S g |5Y�v[rL]_rL|5YáTtc�b o SªY�|5\&`[b�S&v�S�}tS�]_T�¤íY�r¾T�c�b o eV\1efT�TtS&v�c¹`¸|5T�|5Yî½ i © k }ju(\&c o ]_rð}tS�]t�g |5btb�SZT { |fY�v$efcaY[|5\&`�btS�v�S�T�U�WfXZY�S�\1S�Y^]_T�v�S o e { b�U+u²T�U o S g ]_rL|5Y$eyd^efY^]®efca\/|5rwY�T�v�S�clµ­}tS+]_Tår o Y s d1e { efT�v�S g |5Y�v�r�]_rL|5Y1Ttc�b o e­\1efTtT�S�v[ca`�|fT�|5Ya½ i © k }ju { b�S�]_ef�q� g |5b�btSZT { |5Y[v$efcVY[|5\&`�btSv�SZT7U�WfXZY�S�\1S�Y^]_T/v�S o e { btU+u²T�U o S g ]_rw|fYÛe¡d5efY^]1efcÛ\1|5rLY�T&v�S�clµá}tS+]_TZ¤¾S�]7|5YÛv�S�\VefY[v�S$¥zc�S60 < Mee < 150

�8S²± i © � ±�¬��&SZTt] o S�Y�|5\&`�btS�v�SZT°U+W5XZY[SZ\/SZY^]_TªY s eyd5efY^]�¥zc s c�YîT�SZc o }tS�]U�]_rL¥zc�S�]�Up±pS�btd°¬>rL� � ]=S+]=efc g c[Y�efcl]_b�S�U�]�rw¥zc�S+]_U�R-|l|5TtS i © k Rí��SZT@] o S�Y�|5\&`[b�Spv�SZTÑU�WfXZY�S�\1S�Y^]_Te¡d5efY^]�efc�\/|5rLY�T®v�S�clµ&}tS�]�TOU+]_rL¥�c[S�]_U�TOR0|�|5TtS i

�¡k5£

Page 129: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

[GeV]jjM0 20 40 60 80 100 120 140 160 180 200

Even

ts /

Bin

0

20

40

60

80

100

120

[GeV]jjM0 20 40 60 80 100 120 140 160 180 200

Even

ts /

Bin

0

20

40

60

80

100

120

DataZ+jetsZ+HFTopDibosonMultijetZH x100

´*µl¶M

jet1,2

1V T

[GeV]jjM0 20 40 60 80 100 120 140 160 180 200

Even

ts /

Bin

0

10

20

30

40

50

60

70

80

90

[GeV]jjM0 20 40 60 80 100 120 140 160 180 200

Even

ts /

Bin

0

10

20

30

40

50

60

70

80

90 DataZ+jetsZ+HFTopDibosonMultijetZH x100

´b·k¶M

jet1,2

2L

[GeV]jjM0 20 40 60 80 100 120 140 160 180 200

Even

ts /

Bin

-110

1

10

210

[GeV]jjM0 20 40 60 80 100 120 140 160 180 200

Even

ts /

Bin

-110

1

10

210DataZ+jetsZ+HFTopDibosonMultijetZH x100

´*À°¶M

jet1,2

1V T

[GeV]jjM0 20 40 60 80 100 120 140 160 180 200

Even

ts /

Bin

-110

1

10

210

[GeV]jjM0 20 40 60 80 100 120 140 160 180 200

Even

ts /

Bin

-110

1

10

210DataZ+jetsZ+HFTopDibosonMultijetZH x100

´*Áp¶M

jet1,2

2L

�% u¡¢( £li��~¦ � ��rLTt]�b�rw`[c[]_rL|5Y7v�S o e­\1efT�TtS�rLY^Wfeqb�r eqYz]�S�v�SZT¢v�SZclµ°}tS�]�T¢v�efY�T o s U g�� efY^]_r owo |5Y � ±�¬£li��~¦ � e � S+] £li��~¦ � g¡� ¤�S+]av�eqY�T o s U g�� efY^]_r owo |fY k R £�iL�~¦ � ` � S�] £liL�¡¦ � v � ¤�v�efY�T o S g efTV|fÚ o S�T¥zc�eq]_btS�efY�e o d�T�S�T

ee¤eeicr ¤ µµ

S�]µµtrk |fYz]�U�]_U g |5\&`[rwY�U�SZT i R-SZT�Þ��fc�b�S�T�v�c � efcl] � btSZT {i`�efT � T�|fYz]7S�Y�U g�� S owo S o rLY�Uyeqrwb�S � b�SZT {i o |5�^efbtrL] � \1rL¥�c[S �+i R0SVT�rw�fY�e o

ZHT�rL\&c o U { |5c�bªc�Y�S

\VeqT�T�S8v[S �f�~¦ �°S²±�¤�S�]�\&c o ]_r { o rLU { efb>c[Y h e g ]_S�c�b �¡�5� ¤lSZTt]�b�S { b�U�T�S�Yz]�U�S�Y { |5rwY^]�r owo U i

�~k �

Page 130: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

� ù0× ØÒ��;ý6�0ü�� ü����Ĺ%��$þ�� ���H�¼~�$üX�+wÙ�+M/ Å�58;03B^Q;«ÆyA

£ Y�SºrL\ { eqb h efr�]_S;v�U�]�SZbt\1rLY�eq]_rL|5Y v[S o s UZY�S�b��5rLSáv�S�T o S { ]_|fY�TaS�]av�SZT­}tS+]_TaS�Y^]_b_eÒã Y�Sºv[So s UZY�S�b��5rLS�]_b�efY�T@W5SZbtT�S¶\1efY�¥zc�efY^]_Sáv�efY�T o SZTaU+W5X�Y�SZ\/SZY^]_T i �=|5c[b$b�UZTt|5c�v�btS g S { b�|5` o XZ\/Sf¤S�]�eyW5|5rLb o eÛ\/SZr owo SZc�btSºrwY h |fb�\1eq]_rL|5Y { |5T�Ttrw` o SîTtc�b o SZT$Wqefbtr ef` o SZT g rwY�U�\Veq]�rw¥zc�S�TZ¤>|5Y h efrL]c�YÜe~}tc[Tt]_S�\1S�Y^] g rwY�U�\Veq]�rw¥zc�S7T�c[b o ex\/SZTtc�b�S/v�S o s UZY�S�b��5rLS/S+]�v[SZT&eqY�� o S�T°v�SZT o S { ]_|5Y�T°S+]v�SZT>}tS�]_T�¤Ñe¡WqefY^]�S�]�e { b�X�T o s U+]�e { S/v�c�`lu ]�ef�f�5rwY�� i R s e~}tc[Tt]_S�\1S�Y^] g rLY�UZ\1eq]�rw¥zc�S g |5Y[T�rwT@]_SV¯\1rLY�rw\/rwTtSZbOc�Y

χ2 ¤S�Y { SZbt\1S+]�]�eqYz]­eqclµ¶UZY[SZb��frwSZT°S+]�eqclµîefY�� o SZT8v[SZT o S { ]_|5Y�T8S+]­v�SZT®}tS�]�Tv�S�Ú�c g ]�c�SZb�Tt|5c�T o SZT g |5Y^]_b�efrwY^]_S�T�T�c�r�WfeqYz]�SZT­à

• o e&\1efT�TtS°v�SZT�v�S�clµxU o S g ]�b�|5Y[TOv[|5rL]>Ö+]_btSªU��^e o S�¯ � �fi k ± klim¦ �°S²±�å• o S�T¾T�|f\1\/SZT=v�SZT»rL\ { c o Ttrw|5Y�T0v�c

ZS�]�v[SZT»v�S�clµ�}tS�]_T�¤fTtc�rLWqefY^] o SZT¾eÒµlSZT

xS�]

yv[|5rLWfSZY^]

Ö�]�b�S°UZ�^e o S°¯ � ± £ �°S²± i

�=|5c�b¾T_eq]�rwT h eqrwb�S g S�T g |5Y^]_b�efrwY^]_S�TZ¤q|5Y7c[]_r o rwTtS o e�b�U�T�| o c[]_rL|5Y�efY[�5c o eqrwb�Sq¤ÒefrwY�Ttr[¥zc�S o e h |5Y g ]_rw|fYv�S°b�UZTt| o cl]_rw|fY$v�S o s UZY�S�b��5rLS8v�SZT o S { ]_|fY�T�S�]Ov�SZT¾}tS+]_T { |fc�b g |5Y^]�b_efrLY�v�b�S o s e~}tc[Tt]_S�\1S�Y^] i��ÌîÄWalÙ�Î�Ów�-Å~Ê"θËÐÌ�Ëd�É�ÑÓ"Ì�Ê"Ä~úÇ0Ã�Ù1ÓGÃzÏÑÅyÎ�ËÑÙ�Ã^ÅVÇ0Ã�ÙB}�ÃzÅ¡ÙRÑe�btUZT�| o c[]�rw|5Y$Ttc�b o SZTOefY[� o S�T>v�SZT o S { ]_|fY�T�S�]Ov�SZT¾}tS+]_T�SZT@]�\/|5Y^]_btUZS°v�efY[T o S�]�ef` o Syeqc £�i � i��ÌîÄWalÙ�Î�Ów�-Å~Ê"θËÐÃlËÛalË0ÃzÄW��ÊGúÇd�:Í5Ì�ÓGΠÄqÊwevf^Å¡Ä~ÃRÑe/b�U�T�| o c[]_rL|5Y�v[c g e o |5btrw\/X�]_btS8SZY h |fY g ]�rw|5Y�v�S o s U�Y�SZbt�5rwS­\/SZT�c[b�UZS

ES�Y¶�8S²±&¤ T s S+µ { btrw\/S

v�S o e&\1efY�rwX�b�S8Ttc�rLWqefY^]_S�àσ(E)

E=

(

S√E

)2

+

(

N

E

)2

+ C2� £�i ¦5�

NS�Tt]»c[Y�]_S�b�\/S�v�S¢`�b�c�r�]¾btS o rwU¢¯ o s U o S g ]_b�|fY�rw¥zc�S�v s e g ¥zc�rLT�rL]�rw|5Yí¤¡v�SZT»SV�íS+]_T»v[S o s SZ\ { r o SZ\/SZY^]

v�SZT®U+W5X�Y�SZ\/SZY^]_T�¤�S�]>v[S o e�b�efv�rL|^e g ]�rLW�rL]�U�v�S o s c�b�efY�rwc[\NåC

S�Tt]>c[Ya]_SZbt\1S g |5Y[Tt]�eqYz]�v[S g eÒuo rw`[b_eq]�rw|5Y¹¥zc�rp]_rLSZY^] g |5\ { ]_S/v�SZTªY�|5Ylu²c�Y�r h |fb�\/rL]_U�T8\1U g efY[rw¥zc�SZTªS�]�U o S g ]�b�|5Y�rL¥zc�SZTåS

SZT@]c�Y�]�SZb�\/S7v s U g�� efY^]�r owo |5Y�ef�fSf¤-r o btS { btUZTtSZY^]_S o SZTxÚ�c g ]_c�eq]�rw|5Y[T­v s U�Y�SZbt�5rwS1v�U { |5T�U�Sf¤ÑS�]ªb�S�Y�vg |5\ { ]_SVv�S o eáY�|fYlu(c�Y[r h |5bt\1r�]_U/v�S o s U g�� eqYz]�r oLo |5Y�Y�ef�5SVv[c g e o |fb�rw\/X�]�b�Sq¤=v�c[S;¯¶v[SZT�Sl��S�]�Tv s rLb�btUZ�5c o efb�r�]_U�T��5U�|5\1U+]_btrw¥zc�SZT iR0S�T { efb_eq\1X+]_b�S�T

C¤S

S�]N

|5Y^]ªU+]_U/SZT@]_rw\/UZT { |5c�b o SZT­�Oc[Y�T°���je;S�]­���(` { |fc�b o e { efb@]_rLSU o S g ]�b�|5\1ef�5Y�U+]_rL¥�c[S � U o S g ]�b�|5Y�T�S�] {[� |f]_|fY�T � ¤íS�] { |5c[b o e { efb@]_rwS � efv[b�|5Y�rL¥zc�S � }tS+]_T � ¤ { |5c�bo SZT>v[r���UZb�S�Y^]_SZTOb�U��5rw|fY�T>v�cxv�U�]�S g ]�SZc�b i�=|5c�b o e { efb@]_rLSºU o S g ]�b�|5\1ef�5Y[U�]_rL¥zc�S S �5�5�lU ¤ o SZTa]_S�b�\/SZT$Tt|5Y^];rwv�S�Yz]�rw¥zc�S�T { |5c[b o SZTVv�SZclµ�Oc�Y[TZ¤

Cem

Wqefc[]°btSZT { S g ]_r�W5SZ\/SZY^]0.020

¤0.027

S�]0.032

v�efY�T o SZT �>� ¤ § � Y[|5b�v¶S�] § �T�c�v;v�c g e o |5btrw\/X�]�b�Sf¤zS+]

N = 0.4 i RÑe�Wqe o SZc�b¢](d { rw¥zc�S8v�SS { |fc�b®c�Y$U o S g ]_bt|5Y$v�S �z¦ �8S²±

{ |5c[bηdet = 0

SZT@]�v[S �liL�~¦f£li�=|5c�b o e { efbt]�rwS � efv�bt|5Y�rL¥�c[S S �5�~ksU ¤ o SZT { efb�ef\/X�]_btSZT�T�|fYz]�b�S��5b�|fc { U�T�v�efY�T o S8]�eq` o SZefc £liL�y�{ |5c[b o SZT���c�Y�TO���je�S+]��t�(` i

�¡k �

Page 131: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

η φR-S { ]_|5Y �[im�f�^k �[i��5�[�«fS�] �[im� � �[i�� �#%$'&)( £li � � ��UZTt| o c[]�rw|5Y;eqY��5c o efrwbtS�v�SZT o S { ]�|5Y�T�S�]�v�S�T�}tS+]_T i

��c�Y;���jeNhad Shad ChadÜ

ηdet

Ü æ �[i � n[i kq�[� �fi k5k � �[i��f� ��[i �$æ Ü

ηdet

Ü æ �5im� ��imn � k �fi kq�^k �[i�� �5��5i�� æ Ü

ηdet

Ü æ kli�� n[i � �zk �fi k � n �[i��^k �kli´� æ Ü

ηdet

Ü æ n[im� ¦lim� � k �fimn5�5k �[i���Oc[Y�T����(`

Nhad Shad ChadÜηdet

Ü æ �[i � nli ¦5¦q� �5i��y�5� �[i��5�^k�[i �;æ Ü

ηdet

Ü æ �5i�� �limn^kfk �[i � �y� �[i��5�¡��5i�� æ Ü

ηdet

Ü æ kli´� k�i � kq� �5i�n5�^k �[i��kli´� æ Ü

ηdet

Ü æ n[i�� �lim�^£f¦ �5i��¡� � �[i��5�5n#%$'&)( £liL�y� � R-SZT g |�S�Ý g rLSZY^]_T

Nhad

¤Shad

¤�S�]Chad

v[S o e h |fY g ]�rw|5Y³v�Sîb�U�T�| o c[]_rL|5Y³v�So s UZY�S�b��5rLS­]�b_efY[TtW5S�b�TtS/v[SZT�}tS+]_T { |5c�b o S���c�Y¹�t�je � S�Y � efc[] � S�] o SZT��Oc�Y[T����(` � SZY¹`�efT � ¤�SZYh |5Y g ]_rw|fY$v�S o e�b�U��5rw|5Y$v[c�v�U+]_S g ]_S�c�b i��ÌîÄWa�ÙZθÓ.�-Å~ÊGÎ�ËÐÃ�ËÝa�ËÑÃzÄW�¸Ê"ÃáÇÑùÓjÉba�Ó"Ã�ÍfÅ¡Ä~θËÈÇ0Ì�ËÑÙVÓjÉbn `yoR0eºb�UZTt| o cl]_rw|fYÜSZYÛUZY[SZb��frwS$v�S o s U o S g ]_bt|5YÜv�efY[T o s � � � SZT@]7v�U�]�SZb�\/rwY[UZS$¯ { efb@]_rLb�v�S o s rL\7u{ c o T�rw|fYÈ]_b�efY�T@W5SZbtT�S

pTS+]av�S o e�btUZTt| o c[]�rw|5YÈefY��fc o efrLb�Sxv�S o eî]�b_e g Sáv�S o s U o S g ]_bt|5Y i�§ owo S

T s S+µ { btrw\/S8SZY h |5Y g ]�rw|5Y;v�Sηdet

v[S o e h ekÑZ|5Y;Ttc�rLWqefY^]_S7à

σ(1

pT

) =

σ0 + σ1

pT|ηdet| ≤ 1.28

(σ0 + σ1

pT)2 + ((c0 + c1

pT) ∗ (|ηdet| − |η0|))2 |ηdet| > 1.28

η0

Wfeqc[] �fi k �l¤σ0

SZT@] o e/btUZT�| o c[]�rw|5Y;v�Sª`�efT�Sq¤�]�efY�v[rwTO¥�c[Sσ1

{ b�SZY[vºSZY g |5\ { ]_S o e7v�U { S�Yluv�efY g S®T�c[b �~ì pT

i �=|5c[b |ηdet| > 1.3¤qr o d&e�\/|5rLY�T=v[S g |5c g�� SZTpv�S®Ttr o r g rLc�\Kv�efY�T o S�� ¨ ¬8¤ g S¥zc�r-SZY^]_b�eqã Y[S8c�Y�S { o c[T>�5b_efY[v�S { S�bt]_S°v�S°btUZT�| o c[]�rw|5Y¹à o SZT®]�SZb�\/SZT

ci{ b�S�Y�Y�SZY^]OSZY g |f\ { ]�S

g S+]ªSV�íS+] i R-SZT g |�S�Ý g rwSZY^]�T­Tt|5Y^] o SZT8\/ÖZ\/SZT { |5c�b o S�T­�Oc�Y[T­�t�je$S�]­���(`îS�]­Y�S7v�U { S�Y�v�SZY^]{ efT�v�S o e­btUZ�5rL|5YVv[cav�U�]�S g ]_SZc[b i σ0

S�]σ1

Wfe o SZY^]¢b�S�T { S g ]�rLWfSZ\/SZY^] �[i��5�^k S�] �[im�l�¡� åc0

S�]c1Wqe o S�Yz]�btSZT { S g ]_r�W5S�\1S�Yz] �[i��5�^£ S+] �lim�f� � i

X,+.Ù�+ZY ÞÝ2CLN4P�9J7Í9JC� |5\1\/Sa|5Y { SZc[] o SaW5|5rLb&T�c�b o eáÞ��5c�btS £�iL�¡� ¤pe { btXZT o s e~}tc�T@]_SZ\/SZY^] g rwY�U�\Veq]�rw¥zc�Sq¤ o S�T

`�b�c[rL]_T¾v�S h |5Y�v�Tt|5Y^]¢v[U { o e g U�T»W5SZbtT o SZT { S�]�rL]�SZT¾Wqe o SZc�btTZ¤ g S>¥�c[r { S�b�\/S�]�c[Y�SOefc��5\/SZY^]�eÒ]_rw|fYv�c;b_e {[{ |5b@]�T�rL�5Y�e o Ttc�b�`�b�c[rL]�v�S h |5Y�v i

�¡n5�

Page 132: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

� ùlßmà Ø����x VáVý-üÃ���ýd¹®�)l� ����»���0ü� { b�X�T o s U�]_e { Sªv�S o e { b�U�u(TtU o S g ]�rw|5Y¤�v�c¹`lu ]�ef�5�frwY���¤ S+]8v�S o s e~}tc[Tt]_S�\1S�Y^] g rLY�UZ\1eq]_rL¥zc�Sf¤

{ |5c[b=v�eyWqefY^]�eq�5S®efc[�5\1S�Y^]_SZb o e�T�U { efb_eÒ]_rw|fY�v�c&Ttrw�5Y�e o S�]»v[c&`�b�c[rL]=v�S h |5Y[v�¯ o s efrLv�Spv�SZT¾v�r h uh UZb�S�Y^]_SZT�rLY h |5b�\1eq]�rw|5Y�T g rLY�UZ\1eq]�rw¥zc�SZT�¤[|5Y;c[]�r o rwT�S�c�Y;|5c[]�r o e {�{ S o U°�OefY�v[|5\ � |5btSZT@] � � � � ¤v�c { e g�� ef�5S�rLY h |5b�\1eq]�rw¥zc�S­Y�|5\/U&¬ ¨ ± � � { |5c�b�¬Ñ|l| o � rL] h |5b ¨ c o ]_r�Wfeqb�r eÒ]_Sª��eq]�e � Y�e o dzuT�rwT � S �5�¡n�U i R-S$� � S�Tt]7c�Y�S�Y�T�S�\&` o SVv s eqb�`�btSZT�v�Sav[U g rLT�rL|5Y�v�SV](d { S$`�rwY�eqrwb�Sq¤ g |5Y�T@]_btc�rL]�Tv�S h ekÑZ|fY�e o UyeÒ]_|5rLb�S i � o TtSZbt]�¯ g o efTtT�rLÞ�SZb o S�T>U�WfXZY�S�\1S�Yz]�T�S�Y$©(T�rL�5Y�e o �O|5cV©j`�btc�rL]>v[S h |5Y�vl�8¯o s efrwv�S�v�S o SZc[b�T>rwY h |5b�\1eq]_rL|5Y�T g rwY[UZ\1eq]_rL¥�c[SZT i

X�+0/Hâ�+M/ [\<>34Cr9L5]NB^É9J;=<®3�?4ACK7Í58ÊB5]ACR-S�� � c[]�r o rwT�Uªv�efY�T g S�]t]_S7efY�e o d�T�S�T�S g |5\ { |5TtS&v�S kf�f� efb�`[b�SZT i � � ef¥zc�S7eqb�`�btS�eaU�]�U

g |5Y�T@]_btc�rL] � |5c;SZY^]_b�eqã Y�U � v�S o e&\1efY�rwX�b�S8Ttc�rLWqefY^]_Sq¤ � Wf|5rwb®Þ�� i £li��~£5� àT�|5r�]ªc[Y o |f]­v s SZY^]�b_eqãwY�SZ\/SZY^] g |5\ { |fT�U/v s U+W5X�Y�SZ\/SZY^]_T�Ttrw\&c o UZT­v�S1T�rw�fY�e o S�]�v�S/`�b�c�r�]�v[Sh |5Y�v¤�r o T h |5bt\1S�Yz] o eVb�e g rLY�S�v�S o s eqb�`�btS i �¾efb@]�efY^]8v s c�Y�S o rwT@]_S�v[S kf� Wqefb�rwef` o SZTZ¤ g�h�£li��¡�[imk ¤]_|5c�T o SZT�U�WfXZY�S�\1S�Yz]�T�Tt|5Y^]O]�b�rLUZT�T�S o |5Y �¡� Wqefb�rwef` o S�T g�� |5rLT�rwS�T�efc � efT_eqb�vxv�efY�T g S+]�]_S o rwTt]�S i�=|5c�b g�� e g c�Y[Sªv�S�T �¡� Wqefb�rwef` o S�T g�� |5rLT�rLSZTZ¤ o s e o �5|fb�rL] � \/SOU+Wqe o c�S o e�Wqe o S�c�b®v�S8v�U g rLT�rw|fYx¥zc�rv�|5Y�Y�S o e&\1S�r owo SZc�btS�TtU { efb�eq]_rL|5Y$v�S�TOU+W5X�Y�SZ\/SZY^]_T�SZYxv�SZc�µ;Y]ã°c�v�T>Þ o TZ¤�c�Y g |fYz]�SZY�eqYz]Ov�S�TU�W5X�Y�SZ\/SZY^]�TOv[S8T�rw�fY�e o � Y�|f]�U°� { |5c�b®�¾efTtT � S�] o s eqc[]_btS�v�S�T>U�W5X�Y�SZ\/SZY^]�T�v�S�`�b�c�r�]>v�S h |fY�v� Y�|f]�U � { |5c�b � efr o �+i R-S g b�r�]_XZbtSVv�S1v�rLW�rLT�rw|fY�c[]�r o rLT�U7SZT@] o S h e g ]_SZc[b�v�S

GiniS �5�y�kU S �5�~¦WUv�U�Þ�Y[r { eqb

Gini = 2 . SB/(S + B)¤¸|fÚ¹�xS+] � T�|5Y^]�b�SZT { S g ]�rLW5S�\1S�Y^] o S°Y�|5\�`�b�S­v s U�W5X�u

Y�SZ\/SZY^]_T�v�S°Ttrw�5Y�e o S�]Ov�S°`�btc�rL]�v�S h |5Y[v g |5Y^]_S�Y�c[T�v�efY[T o S8Y]ã°c�v iR s e o �5|5b�r�] � \/S7SZT@]1r�]_U�b�U$efc�µ�v�S�clµ�Y]ã°c�v[T7Þ o T&v�S$\1efY�rLXZbtSab�U g c�btT�rLWfSf¤�S+] o eºv�r�W�rwT�rL|5YÜTtS]_SZbt\1rLY�S�¥zc�efY[v o S�Y�|5\&`[b�S8v s U�WfXZY�S�\1S�Yz]�T�v�rLT { |5Y�rL` o S�v�efY�T>c�YxY]ã°c�v;SZT@]�rLY h UZbtrwS�c�b>¯ kf� ¤|5c ¥zc�efY[v o S;Y�r�W5Syeqcøv�S o s eqb�`�btSxS�µ g XZv[S �~¦ U+]�ef�fSZT i ��efY[T g S g efT o S;Y]ã°c�vøS�Tt]ae {�{ S o Uh SZc�r owo S i R s S�Y^]_b_eÒã Y�S�\1S�Yz]Ov�S o s efb�`[b�S°T�S { |fc�b�Ttc�rL]»}tc�Tt¥�c s ¯ g Sª¥zc�S g�� ef¥zc�SªY]ã°c�váv�S+W�rwSZY[Y�Sc�Y�S h SZc�r owo S i� � ef¥zc�S h SZc�r owo S1SZT@]VS�Y�T�c�r�]_S;U�]�rw¥zc�S+]_UZSxT�rL�5Y�e o � |5cÛ`�btc�rL]7v�S h |5Y�v � T�r�T_e { c�btS�]�U�v�U+Þ�Y�rLS{ efb

P = S/(S + B)¤�S�Tt]�T�c { UZbtrwSZc[b�S � |5cárLY h UZbtrwS�c�b�S � ¯ �[i ¦�i R-S�T kf�5� efb�`[b�SZT�v�cº� � |5Y^]

U�]_U1SZY^]_b�eqã Y[UZT�v[S o e�\/ÖZ\/S h epÑZ|5Y¤0\1efrwT­eyW5S g v�S�T g |f\&`�rwY�efrwTt|5Y�T­v�S �¡� Wqefb�rwef` o SZT°v�r���U+ub�SZY^]�SZT g�� |5rLT�rwS�T>efc � eqT_efbtvxv�efY�T o e o rwT@]_S i�· Y$rwY~}tS g ]�S8SZY�Ttc�rL]�S o e�]�|f]�e o rL]�U�v[SZT>U�WfXZY�S�\1S�Y^]_Tv�S�v�|fY�Y�UZS�T8S�]�v�S&`�btc�rL]�v�S h |5Y[vº\&c o ]_r }tS+]_T�¤ efrwY�Ttr=¥zc s c�Y�S { efbt]�rwS � o e7\/|5rL]�rwU � v�S�T�U�WfXZY�S�u\1S�Yz]�T�Ttrw\&c o UZT�¯ o e­b�e g rLY�S�v[S o s efbt`�b�S i � S+]�]�S�| { UZb_eÒ]_rw|fY1S�Tt]®SV�íS g ]�c�UZS�Ttc�b o SZT kf�5� eqb�`�btSZT i�lc�rLWqefY^]8TtSZT°rwY h |5b�\1eq]_rL|5Y�T g rLY�UZ\1eq]�rw¥zc�SZT�¤ o SZT8U�WfXZY�S�\1S�Y^]_T­b�Sj}t|frwY�v�bt|5Y^]8c�Y�S h S�c�r oLo Sq¤¸S+]°r oT�SZb�eºeq]t]_b�rL`�c�U1¯ o s U�WfXZY�S�\1S�Y^] o e { c�b�S+]_U1v�S g S+]�]�S h SZc[r owo S i R0e { c[b�S�]�UV]_|q]�e o S/v[S o s U�WfXZY�S�u\1S�Yz] g |5btb�S�T { |5Y�v�b�e�e o |5btT�¯ o eª\/|¡d5S�Y�Y�S�v�S�T { c�btS�]_U�T g e o g c o UZS�T { |5c�b g S�]®U�W5X�Y�SZ\/SZY^] { efbg�� ef¥zc�S­efb�`[b�Sf¤[S�] { |5Y�v�U�b�UZS8v[S o SZc�b { S�b h |5bt\VefY g S i R0e { S�b h |5bt\VefY g S8v s c�Yxefb�`[b�S8SZT@]�v�U�ÞluY�rwS { efb

Perf = N ∗ (1−N)¤N

U+]�efY^]�UZ�^e o efcaY[|5\&`�btS�b�S o eq]�r h v�SZT®U+W5X�Y�SZ\/SZY^]_T>¥zc�r�|5Y^]g |5btb�S g ]_S�\1S�Yz]ªU�]�U1TtU o S g ]�rw|5Y[Y�UZT { S�Y�v�efY^] o s SZY^]_b�eqã Y�S�\1S�Y^] i �lrpc�Y�efb�`[b�S g o eqT�T�S/c�Y��5b_efY[vY�|5\&`�btS°v s U+W5X�Y�SZ\/SZY^]_T�SZYá`[b�c�r�]�v[S h |5Y[v¤ e o |fb�T�¥zc s r o T s ef�5r�]�v s U+W5X�Y�SZ\/SZY^]_T8v[S­Ttrw�5Y�e o � S+]b�U g r { bt|l¥zc�S�\1S�Y^] � ¤ g S�]�efbt`�b�S°efc[b_e7c�Y�S°\Veqc[WqefrwTtS { S�b h |5bt\VeqY g S iR0SV� � eáU�]�UVS�Yz]�b_eqãwY�UVTtU { eqb�UZ\/SZY^] { |5c�b o S�T&��c�Y�T��t�jeáS�]����(`¤ { |5c�b o SZT �5� \1efT�TtSZT&v[Sç rw�f�5T g |5\ { b�rLT�SZT­SZY^]�b�S �¡�f� �8S²±ÔS+] �~¦f� �°S²± � { eqb { eqT�v�S ¦ �°S²± � ¤0S�] { |fc�b o SZT­v�SZclµo |f]�T�v s U�WfXZY�S�\1S�Y^]_T � ±�¬KS�] k R i R-S&� � e1UZ�^e o SZ\/SZY^]�U�]_UªSZY^]_b�eqã Y[UªTtU { efbtUZ\/SZY^] { |5c�b o S�T

�yn[�

Page 133: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

¥zc�eq]_btS­efY�e o dlTtSZTee

¤eeicr ¤ µµ

¤�S+]µµtrace ¤�eqrwY�Ttr¥zc�S { |5c�b>v[r���UZb�S�Y^]_SZT g |5\&`�rLY�efrwTt|5Y�T®v[SZT

g efY�efclµ�S�]&v[SZT7��c�Y�T i R-Sa� � eáU�]�UaSZY^]�b_eqãwY�U$eyW5S g c�Y�¥zc�efbt]�v�SZT�U g�� efY^]_r owo |5Y�T­T�rw\�c o U�Tv�S7T�rL�5Y�e o

ZHS+]�v[SZT°`�b�c[rL]_T°v�S h |5Y[vÜ� ¨ å0c�Y�efc[]�b�S7¥zc�efb@]ªv[SZT­U�W5X�Y�SZ\/SZY^]�T�T�rL\&c o UZT°e

T�S�btW�r0¯ o S�]_S�Tt]_S�b�S�]�¯�v�U�]�SZb�\/rwY[SZb>T�|fY�S+Ý g e g r�]_Uq¤ g�hji Þ�� i�£liL� �®å�S�] o e�\/|5rL]�rwU�b�SZT@]�efY^]�S­v[SZTU�WfXZY�S�\1S�Yz]�TªTtrw\&c o UZT°eqrwY�Ttr¾¥zc�S o eV]_|q]�e o rL]_Uªv�SZT°v�|fY�Y�UZS�TªS+]°v�S7`�b�c[rL]8v�S h |5Y[v�� � � |5Y^]{ S�b�\/rwT®v[S { b�|�v�c�rwbtS o S�T>v�rwT@]_b�rL`�c[]�rw|5Y�T�¥�c[rÑTtSZb@WlrLb�|5Y^]O¯7U�]_ef` o rLb o S�T o rL\1r�]_SZT iR-S&� � h |5c�btY�rL]�c�Y�S­Wqefb�rwef` o S8Þ�Y�e o Sªv�rwT g b�rL\1rLY�efY^]_S � � �

out�Og |f\ { btrwTtSªS�Yz]�b�S � S�] �ª{ |fc�b

o S�T�v�|5Y[Y�UZS�T8S�] o eVT�rL\&c o eÒ]_rw|fY i � SZT8v�S�b�Y�rLXZbtSZT�btSZT�TtSZ\&` o SZbt|5Y^]°v s efc[]�eqYz] { o c�T�¯av�c¹T�rL�5Y�e o� `�btc�rL]�v�S h |fY�v � ¥zc�S o SZc[b�T�Wqe o SZc�btT�v�eqY�T o e/v�rwT@]_btrw`�c[]�rw|5Yxv�S o e/Wqefbtr ef` o S8Þ�Y�e o S�v�rLT g btrw\/r�uY�efY^]_SªT�S�b_e { bt| g�� S�v�S � � �5�+i R0ea� �

out{ SZb�\/S�]�efrLY�T�r0v�S&btS g�� S�b g�� S�b o S­T�rL�5Y�e o v�cá`�|5Tt|5Y

v�S ç rw�5�fT i RÑeá� �out

SZTt]&c[]_r o rwTtUZS { efb � · R0R-� §ô{ |5c[b�c�Y�SaefY�e o dlTtSVT@]�eq]�rwTt]�rw¥zc�Sq¤¾eqÞ�Y�v�Sv�U�]�SZbt\1rLY�SZb o e&T�S g ]_rL|5Y�S+Ý g e g Sªv�S { bt|lv[c g ]�rw|5Y$v�cx`¸|5T�|5Yxv�S ç rL�5�5T�¤[W5|5rLb g�� e { r�]_btS°� i

X,+M/Hâ�+�Y äå7Í5];=7ÍÊÔP=ACÛN�9J;0P=;=CL2ACR0S�T �y� Wqefb�rwef` o SZT�¥zc�r |5Y^]�TtSZb@Wlr�¯ªS�Y^]_b_eÒã Y�S�b o S�� � |5Y^]�U+]_U g�� |5rwTtrwS�T�efc � efT�efb�v { efbt\1rLT

o S�T kf� Wfeqb�r eq` o S�T®T�c�r�WqefY^]_SZT°àÓ"Ã�ÙBz[Ì�ÄÒÊ"Ì8�¾ÓGÃ�Ù�ÇÑÃ�Ù>}ZÃ^Å~Ùch o e�v�rLTt]_btrw`�cl]_rw|fY&v�S o e�\1efT�TtS>rwY^Wqefb�rwefY^]_S®v[SZTpv�SZc�µ�}tS�]�T � ¨ j1j2 � ¤o e$T�|f\1\/S7v�S o s rL\ { c o Ttrw|5Yá]�b_efY[TtW5S�b�TtSav�SZT­v�S�clµ$}tS�]_T � { j1j2

T� ¤-S�] o s rw\ { c o T�rL|5Yá]_b�efY�T@W5SZbtT�S

v�SZTªv�SZc�µx}tS+]_T � { j1T

S�] { j2T

��i R-S�T&efY�� o SZT∆φ

S+]∆η

SZY^]_btS o S�Tªv[SZclµ;}tS�]�T i=§ YlÞ�Y¤ o SZT­WqeÒub�rwef` o S�T ¨ j1j2 ¤ { j1

T

S+] { j2T

¤5e { b�X�T o e g |5b�btS g ]�rw|5Y7v�S o s e¡}tc�Tt]�SZ\/SZY^] g rLY�UZ\1eq]_rL¥zc�S iq§ Y1�5U�Y�UZb�e o ¤o S�T®Wfeqb�r eq` o S�T>¥�c[rÑTt|5Y^] g |5b�btU o UZSZT�Y�S­T�S�btWfSZY^] { eqT�¯ o s SZY^]�b_eqãwY�SZ\/SZY^]Ov�c�� � ¤�\1efrLT g |5\/\/Sg S�TªWqefb�rwef` o SZT°v�SZT>}tS�]�Tª|5Y^]�v�SZTªv�rwT@]_b�rL`�c[]�rw|5Y�T8Ttc[Ý/T_ef\/\/SZY^]&v�r*�íU�b�S�Yz]�SZT�e¡WqefY^]ªS�]�e { btXZTo s e~}tc�T@]_SZ\/SZY^] g rwY�U�\Veq]�rw¥zc�Sq¤ � g+hji Þ�� i¸£li��¡�f� ¤�S oLo S�T>|5Y^]�U�]_U­c[]�r o rLT�U�SZT iÓ"Ã�Ù�z�Ì�ÄÒÊGÌ]�¾ÓGÃ�Ù�Ì�ÙZÙZÎ-Í^Ê�a�Ã�Ù�Ì]�\��θÙZθËÜó"h o s rw\ { c o Ttrw|5Y°]_b�efY�T@W5SZbtT�S>v�c7`¸|5T�|fY7½¾¤ o SZT�efY[� o S�T∆φ

S+]∆η

SZY^]_btS o SZT�v[SZclµ o S { ]_|fY�TZ¤�efrwY[T�r0¥zc�S o e g | o rLY�UyefbtrL]�U­S�Y^]_b�S o S�T�v�S�clµ o S { ]_|5Y�TO¥zc�rSZT@] o S g |5TtrwYzc�T�v�S o s efY�� o S�S�Yz]�b�S o S�T�v�SZclµ o S { ]�|5Y�T iÓ"Ã�ÙÔz�Ì[ÄqÊGÌ]�=Ó"Ã�Ù8Ì�ÙyÙ�Î-Í^ÊwazÃ�Ù°Ì��ÛÙlæ0Ù�ÅsfLe�Ã;ó,çÔ}ZÃ^Å~Ù½h o e8T�|5\/\1S�v�S o s rw\ { c o T�rL|5Y�]_b�efY�T@W5SZbtT�Sv�SZT�v�S�clµ o S { ]_|5Y[T�S+]�v�SZT�v�SZc�µ�}tS�]_T � {

T (l1l2, j1j2) � e { b�XZT o e g |5b�btS g ]�rw|5Y7v�S o s e~}tc�T@]_S�\1S�Yz]g rLY�UZ\1eq]_rL¥zc�Sf¤[efrwY�Ttr¥zc�S o s efY�� o S

∆φSZY^]_btS o SZT o S { ]_|fY�T�S�] o S�T�v�SZclµª}tS�]_T

∆φ� ½¾¤

j1j2 ��iÓ"Ã�Ùèz�Ì[ÄqÊGÌ]�=Ó"Ã�Ù�šΠÏ�θÓ"Î �¸Ê.éQ�ÑÃ�Ùêh g |fT � θ �q� ¤ θ � S�Tt] o s efY�� o SáS�Y^]_b�S o e�v�rwbtS g ]_rw|fY:v�c h efrwTjug SZefc1v[S { b�|f]�|5Y7S�] o SO½$v�efY[T o S>b�S { X�b�S�|5Ú o s rw\ { c o Ttrw|5Y­]_b�efY�TtWfSZbtT�SOSZTt]�Yzc oLo Sf¤fr o { SZbt\1S+]pv�Sv�r���UZbtSZY g rwS�b o SZT�½ { b�|�v�c�r�]_T>SZYáefT�Tt| g r eq]�rw|5Y;eyWfS g v[SZclµ&}tS+]_TOv�S°`�rLT�T�c[T�v�c ç rL�5�5T�v�S°T { rwYYzc o ¤-v�S�T�eqc[]_btSZT�½ÐefTtT�| g rLUZTª¯xv�S�T>}tS+]_T­v�S/`�rLT�T�c[Tªv�S/� o c�|5Y¶v�S/T { rLY�S�Yz]�rwS�b S �5�¡�WU S �5�¡£WU iR0e�\1efT�TtSVrwY^Wqefbtr efY^]_S ¨ �

l1l2, j1j2 � S�] o exT�|5\/\1S/T g e o eqrwb�S/v�S o s UZY�S�b��5rLS ç T

�l1l2, j1j2 �efT�Tt| g rwU�Sªeqclµxv�SZc�µ o S { ]�|5Y�T

l1S+]

l2S�]�efclµxv�S�clµ�}tS�]�T i¸§ Y[Þ�Y¤ o e�\1efT�TtSªrLYzWqefbtr efY^]�S­S+] o e

T�|5\/\/S­v[S o s rw\ { c o T�rL|5Y$]_b_eqY�TtWfSZb�TtS&v�S­]_|5c�T o S�Tp}tS�]�T { btUZTtSZY^]_T8v�eqY�T o SZTOU�W5X�Y�SZ\/SZY^]�T­Tt|5Y^]efc�TtT�r-c[]�r o rLT�U�SZT i� o SZTt]ª]_btXZT�rL\ { |5b@]�efY^]­v s e¡Wf|5rwb­c�YÜ`¸|5Y�e gZg |5b�vÜS�Y^]_b�S o S�T�v�|5Y[Y�UZS�T&S�] o exT�rw\�c o eq]�rw|5Y¹v[SZTWqefb�rwef` o S�T0T�SZb@WqefY^]p¯�SZY^]�b_eqãwY�SZb o S�� � iq· Y g |5\ { b�SZY[v&v�|5Y g ¥zc�S o s U�]_e { S�v�S o e { b�U+u²T�U o S g ]_rL|5YSZT@] g b�c g r e o S { |5c�b g S+]�]�S { efb@]_rLS�v�S o s efY�e o d�T�Sq¤�S+] { efb g |5Y�TtUZ¥zc�SZY^] { |5c�b o s U�]_ef` o rLT�TtSZ\/SZY^]�v�S

�¡n^k

Page 134: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

o e o rw\/rL]�S i � s efc[]�b�SZT8v[rwTt]�b�rL`�c[]_rL|5Y�TOY�|5Y¹S�Y g |5btS&\/|5Y^]_b�U�SZT8v�eqY�T o S�T g�� e { rL]_btSZT { b�U g UZv�S�Y^]_Tg |5\/\1S o e g | o rwY�UZefb�r�]_U7SZY^]_btS o S�T�v�S�clµ�U o S g ]_bt|5Y�TZ¤ o ex\VefTtT�SarLY^Wfeqb�r eqYz]�S1v[Sa]_|5c�T o S�TO}tS�]�TS�] g S owo S8v�c�T@d�Tt]_X�\1S

(l1l2, j1j2)|fcxS�Y g |fb�S o e&T�|f\1\/S8v�S o s UZY�S�b��5rLS�T g e o eqrwb�S�v�c�T@d�Tt]_X�\1S

(l1l2, j1j2)¤ { |5c[b o S g efT�|5Ú o S�T>efY�e o d�T�SZT

eeS�]

eeicr T�|5Y^] g |f\&`�rwY[UZSZT�¤�T�|fYz]O\/|5Y^]_btUZSZT>S�YS+µlSZ\ { o S8Ttc�b o e&Þ��5c[b�S £li�� � i

�yn5n

Page 135: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

[GeV]jjM0 20 40 60 80 100 120 140 160 180 200

Even

ts /

Bin

0

10

20

30

40

50

60

70

80

[GeV]jjM0 20 40 60 80 100 120 140 160 180 200

Even

ts /

Bin

0

10

20

30

40

50

60

70

80 DataZ+jetsZ+HFTopDibosonMultijetZH x100

´�µl¶M

jet1,2

2L

´bëWìZí=îðïWñ�¶ [GeV]jjM

0 20 40 60 80 100 120 140 160 180 200Ev

ents

/ Bi

n0

10

20

30

40

50

60

[GeV]jjM0 20 40 60 80 100 120 140 160 180 200

Even

ts /

Bin

0

10

20

30

40

50

60DataZ+jetsZ+HFTopDibosonMultijetZH x100

´b·p¶M

jet1,2

2L

´bëkòlówñwîðïWñ«¶

[GeV]jjM0 20 40 60 80 100 120 140 160 180 200

Even

ts /

Bin

0

20

40

60

80

100

120

[GeV]jjM0 20 40 60 80 100 120 140 160 180 200

Even

ts /

Bin

0

20

40

60

80

100

120 DataZ+jetsZ+HFTopDibosonMultijetZH x100

´*ÀM¶M

jet1,2

1V T

´*ëWì.í0î�ï�ñ�¶ [GeV]jjM

0 20 40 60 80 100 120 140 160 180 200

Even

ts /

Bin

0

20

40

60

80

100

120

[GeV]jjM0 20 40 60 80 100 120 140 160 180 200

Even

ts /

Bin

0

20

40

60

80

100

120 DataZ+jetsZ+HFTopDibosonMultijetZH x100

´*Á�¶M

jet1,2

1V T

´bëkòlówñwîðïWñ«¶�% u¡¢( £li��¡� � ��rwTt]�b�rL`�c[]_rL|5Yáv[S o e/\VefTtT�S&rLY^Wfeqb�r eqYz]�Sªv[SZT8v�S�clµ/}tS+]_T�¤ { |5c�b o S o |q] k RÛeyWqefY^]£li��¡� � e � S�]ªe { btXZT £li��¡� � ` � e~}tc�Tt]�SZ\/SZY^] g rwY[UZ\1eq]_rL¥�c[Sf¤S+] { |5c�b o S o |f] � ±�¬ eyWqefY^] £liL�y� � gy�S�]�e { b�X�T £li��¡� � v � e~}tc�Tt]�SZ\/SZY^] g rwY�U�\Veq]�rw¥zc�S i R-S�T�¥zc�eq]_btS&efY�e o d�T�S�T

ee¤eeicr ¤ µµ

S+]µµtrk|5Y^]­U�]_U g |f\&`�rwY[UZSZT i R-S1Ttrw�5Y�e o

ZHT�rw\�c o U { |5c�b°c�Y�S7\1efT�TtS1v[S �5�¡¦ �8S²±&¤-S+]�\�c o ]�r { o rwU

{ efb>c�Y h e g ]_SZc[b �y�5� ¤[S�Tt]�b�S { b�U�T�SZY^]�U�SZY { |5rwY^]_r owo U i

�¡nf�

Page 136: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

�% u¡¢( £�iL�~£ � � g�� U�\Ve>v s c�Y­v�SZTÑefbt`�b�S�T0v�c�� � i R0S�T0Y]ã°c�v�T0T�|5Y^]Ñb�S { b�U�T�S�Yz]�UZT { efb-v�S�T g SZb g o S�T� SZYx` o SZc�T � S�] o S�TOY8ã­c[v�T>]_SZbt\1rLY�efclµaT�|5Y^]Ob�S { b�U�T�S�Yz]�UZT { efb>v�S�T h S�c�r oLo SZT � SZY;W5S�bt]�SZT ��i

�yn^¦

Page 137: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

�% u¡¢( £li�� � � § Ý g e g rL]�U&v�cºTtrw�5Y�e o S�Y h |5Y g ]_rw|fYáv�c¹`�btc�rL]�v�S h |5Y[v { |fc�b o S&� � i R-S�T�v�SZc�µg |5c[b�`¸SZT�eqclu(v�S�T�Ttc�T�b�|fc��5S�S+]�` o SZc[S�T�|fYz]�b�S�T { S g ]�rLWfSZ\/SZY^] o S�T�S+Ý g e g rL]_U�T { |5c�b o SZT�U g�� eqYlu]_r owo |fY�T k R { |5c�b o SZT��Oc�Y[T��t�je � {�~£/k R � S+]��t�(` � { kf�1k R �+i R-SZTOv�SZc�µ g |5c�bt`�S�T�v s S�Ý g e g r�]_Uefclµzu(v[SZT�Tt|5c�T�Y[|5rwbtS­S+]�WfSZbt]�S&T�|fYz]�b�S�T { S g ]�rLWfSZ\/SZY^] { |5c�b o SZTOU g�� efY^]_r oLo |5Y[T � ±�¬Kv�S�T8�Oc[Y�T���je � {í�~£a� ±�¬ � S�]O�t�(` � { kf�$� ±�¬ �+i

�¡n5�

Page 138: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

Colinearity-1 -0.8 -0.6 -0.4 -0.2 -0 0.2 0.4 0.6 0.8 1

Even

ts /

Bin

0

200

400

600

800

1000

1200

Colinearity-1 -0.8 -0.6 -0.4 -0.2 -0 0.2 0.4 0.6 0.8 1

Even

ts /

Bin

0

200

400

600

800

1000

1200DataZ+jetsZ+HFTopDibosonMultijetZH x100

´*µl¶Colinearity (ee + eeicr)

[GeV]jetsM0 20 40 60 80 100 120 140 160 180 200

Even

ts /

Bin

0200400600800

10001200140016001800200022002400

[GeV]jetsM0 20 40 60 80 100 120 140 160 180 200

Even

ts /

Bin

0200400600800

10001200140016001800200022002400 Data

Z+jetsZ+HFTopDibosonMultijetZH x100

´*·p¶M jets (ee + eeicr)

[GeV]ZHM0 100 200 300 400 500 600

Even

ts /

Bin

0

500

1000

1500

2000

2500

[GeV]ZHM0 100 200 300 400 500 600

Even

ts /

Bin

0

500

1000

1500

2000

2500

DataZ+jetsZ+HFTopDibosonMultijetZH x100

´*ÀM¶M l1l2,j1j2 (ee + eeicr)

(llbb) [GeV]TH0 100 200 300 400 500 600

Even

ts /

Bin

0

500

1000

1500

2000

2500

3000

3500

4000

4500

(llbb) [GeV]TH0 100 200 300 400 500 600

Even

ts /

Bin

0

500

1000

1500

2000

2500

3000

3500

4000

4500 DataZ+jetsZ+HFTopDibosonMultijetZH x100

´*Á�¶H

l1l2,j1j2T (ee + eeicr)

�% u¡¢( £liL� � � ��rwT@]_b�rL`�c[]�rw|5YÈv�S o e g | o rLY�Uyeqb�rL]�UáS�Yz]�b�S o SZTav�S�clµ³U o S g ]_bt|5Y�T £li�� � � e � ¤®v�S o e\VefTtT�S­rwY^Wqefb�rwefY^]_S°v�S°]_|5c[T o SZT»}tS�]_T £li�� � � ` � S+]�v[cáTtd�T@]_XZ\/S

(l1l2, j1j2) £li�� � � gy� ¤ S+]�SZYlÞ�Yo e�v[rwTt]�b�rL`�c[]_rL|5Y v[S o e�Tt|5\/\1Sxv�S o s UZY[SZb��frwSxT g e o efrLb�SºeqT�T�| g rLUZS¹eqcøTtd�Tt]�XZ\/S

(l1l2, j1j2)£liL� � � v ��i R-SZT­efY�e o d�T�S�Tee

S�]eeicr |5Y^]°U�]�U g |5\&`�rLY�UZS�TZ¤v[S { o c�T�¤|5Y¶v�S�\VefY[v�S7efc¶\1|frwY�T

v�SZclµ&}tS+]_TOv�efY�T o S�T�U�W5X�Y�SZ\/SZY^]�T�S�] o e�\1efT�TtSªv�cZ

v[|5rL]�Ö+]_b�S g |f\ { btrwTtS­S�Y^]_b�S �5� �°S²±èS+]�~¦f� �°S²± i

�yn^£

Page 139: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

X,+M/Hâ�+.- äå7Í5];=7ÍÊÔP=AO?4;=CL^�5];0GI;=347>3%9JAOôÔ3B7>P0ARÑe�Þ��5c[b�S £limkf� \/|5Y^]_btS o e&Wqefb�rwef` o S8v�S°T�|5b@]_rwS°v�c�� � { |5c�b o S�T o |f]�T � ±�¬éS�] k R�¤ { |fc�b

o S g efT�|5Ú o S�T�¥zc�eq]�b�S�eqY�e o d�TtSZT�Tt|5Y^] g |5\�`�rwY�U�SZT�S+] { |5c�b o s efY�e o dlTtSeeicr T�SZc o S i R0e1Þ��5c�btS

£limkl� \/|5Y^]_b�S o eVv�rLTt]_btrw`�cl]_rw|fYºv�S o e1v�r���UZbtSZY g S�SZY^]_btS o SZT�v[|5Y�Y�U�SZT°S�] o SZT8`�btc�rL]�T�v�S h |5Y�ví¤|5`[]�SZYzc�S�e¡WfS g o S;� � { |5c�b�c[Y ç rL�5�5T�v�S �5�¡¦ �8S²±&¤ o SZT7¥zc�eq]�b�SxefY�e o d�T�SZT1efrLY�T�r®¥zc�S o S�T�Oc[Y����jexS�]ª���(`�|fYz]ªU�]�U g |5\&`�rLY�UZT i¾· YîW5|5r�]�¥zc�S1Y�|5T­v�|5Y�Y�U�SZT&Tt|5Y^] g |5\ { eq]_rL` o S7eyWfS g o S`�b�c[rL]8v�S h |5Y�v i � |5\/\1S�r o Y s d¶e { efT°v s S+µ g X�T�v�S7v�|5Y[Y�UZS�Tªv�eqY�T o e$b�U��5rw|5Y¹v[c�Ttrw�5Y�e o ¤ o eWqefb�rwef` o S�v�rwT g btrw\/rwY�efY^]�S�v�c�� � SZT@]Oc[]_r o rwTtUZS { |5c�b o s U+]�ef` o rwTtT�S�\1S�Yz]�v[S o e o rL\1r�]_S i� ùlßyß õö�y��¹, l�xýV���

� S g�� e { r�]_b�S�v[U g btrL] o eab�S g�� SZb g�� S1v[cî`¸|5Tt|5Y¶v�S ç rL�5�5T�v�c¶\/|lv[X o SªTt]_efY�v�efbtv { b�|�v�c�r�]SZY�efT�Tt| g r eq]�rw|5YîeyW5S g c�Yî`�|fT�|5Yܽ¾¤-|5Ú o S ç rw�5�fT­TtS1v[UZT�rLY^]_XZ�fb�S/SZY { efrwbtS/v[S8}tS+]_T

bbS+] o S

½¶S�Y�U o S g ]_bt|5Ylu { |5TtrL]�b�|5Y i R-SZTO�5b_efY[v�SZT�U�]_e { SZT�v�S o s efY�e o dlTtS8¥zc�r-T�|5Y^] o e { btU+u²T�U o S g ]_rw|fYxv[SZTv�|5Y�Y[UZSZT­S�]°v[SZT­`�b�c�r�]_T8v�S h |5Y[v¤ o s U�]�rw¥zc�S�]_ef�5S�v�S�T�}tS�]_T°v�S

b¤ o S�T°v�r���UZbtSZY^]_S�T g |5b�btS g ]_rw|fY�T

e {�{ o rw¥zc�U�SZTÑefclµ­U+W5XZY[SZ\/SZY^]_T»Ttrw\&c o UZT�¤yS�]¾efrLY�T�r^¥zc�S o e>T�U o S g ]_rL|5Y°Þ�Y�e o S�v[SZTÑU�W5X�Y�SZ\/SZY^]�T»|5Y^]U�]�U8v�U�]_efr oLo UZS�T i[§ YlÞ�Y¤ o SZT>v�rLTt]_btrw`�cl]_rw|fY�T�v�S g |5Y^]_b ÷ o S�S�Yz]�b�S o S�T>v�|5Y�Y[UZSZT�S+] o e&T�rL\&c o eq]_rL|5Y¤{ b�U�T�S�Yz]�UZS�T�¯ g�� ef¥zc�S­U�]_e { S°v�S o s efY�e o d�T�Sq¤�|5Y^]O\1|fYz]�b�U�SZT�c�Yx`�|5Yxe g�g |5btv i

�¡n �

Page 140: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

RF Output0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1

Even

ts /

Bin

0

20

40

60

80

100

120

140

RF Output0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1

Even

ts /

Bin

0

20

40

60

80

100

120

140

DataZ+jetsZ+HFTopDibosonMultijetZH x100

´*µ�¶RF 1V T

out all

RF Output0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1

Even

ts /

Bin

0

20

40

60

80

100

120

RF Output0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1

Even

ts /

Bin

0

20

40

60

80

100

120

DataZ+jetsZ+HFTopDibosonMultijetZH x100

´b·k¶RF 2L

out all

RF Output0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1

Even

ts /

Bin

0

5

10

15

20

25

RF Output0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1

Even

ts /

Bin

0

5

10

15

20

25

DataZ+jetsZ+HFTopDibosonMultijetZH x100

´�ÀM¶RF 1V T

out eeicr

RF Output0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1

Even

ts /

Bin

0

2

4

6

8

10

12

14

16

RF Output0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1

Even

ts /

Bin

0

2

4

6

8

10

12

14

16

DataZ+jetsZ+HFTopDibosonMultijetZH x100

´*Áp¶RF 2L

out eeicr

�% u¡¢( £li kq� � ±�efbtr ef` o SZT�v�S&T�|fbt]_rLSZT�v[c¶� � { |5c�b�c�Y ç rL�5�5T�v[S�\VefTtT�S �f�~¦ �8S²±&¤ { |5c�b o S�T¥�c�eq]_btS;efY�e o dlTtSZT

ee¤eeicr ¤ µµ

S+]µµtrk g |5\&`[rwY�U�SZTZ¤ { |5c[b o S�T o |f]�T � ±�¬ £limkf� � e � S+] k R

£li kq� � ` � ¤�S�] { |5c�b o s efY�e o d�T�Seeicr TtSZc o Sf¤ { |5c�b o SZT o |f]�T � ±�¬ £limkf� � g¡� S�] k R £limkf� � v �+i

�yn �

Page 141: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

�% u¡¢( £li k�� � ��rwTt]�b�rL`�c[]_rL|5Yºv�S o eVv�r���UZbtSZY g S7SZY^]_btS o SZT8v�|fY�Y�UZS�T°S�] o S�T�`�b�c[rL]_T8v[S h |fY�v¶SZYh |5Y g ]_rw|fYxv[S&� �

out{ |5c�bOc�Y ç rw�f�5T�v�S �f�~¦ �8S²± i R-SZT { |5rwY^]_T�Tt|5Y^] o S�T�v�|5Y�Y�U�SZT�|5`[]_S�Yzc�SZT

e { btXZT o e8T�|fc�Tt]�b_e g ]_rw|fY1v�S�T�`�btc�rL]�Tpv�S h |5Y�v i R0e°`�efY�v�SO` o SZc�S�b�S { b�U�T�S�Yz]�S o s SZbtb�S�c�bpTtd�Tt]�UZ\1eÒu]_rL¥�c[S�e { b�X�T�]�b_efr�]_S�\1S�Yz]Z¤ g�hji � i klimk ¤^S+] o e o rL�5Y�S>bt|5c��5S>btS { btUZT�S�Y^]_S o e8v�rwT@]_b�rL`�c[]�rw|5Y�v�c/T�rL�5Y�e oZH

\&c o ]_r { o rwU�S { efb>c�Y h e g ]�SZc�b ¦li

�y�^�

Page 142: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

÷ ø²ù�ú¿ûÉü�ý�þ ÿ

� û�� ûÉü�þ�� ��� ý �ù ��þ��güiû�� þ� �_ù��Dþ � þú²ý�������güiû�� ��� � ����� � þ � û�����

[\<®3®98A3®98C����� � ��!#"$�%"'&(!#"'&()�*,+.-/+0"$+1!#"2�3�3�4�3�5�3�4�3�3�4�3�5�4�3�3�4�3�3�5�4�5�76,�

8%9;:<9;: =,>3?A@CBEDGFIHKJCLs

9L9M9L9M9N9L9M9L9M9L9M9M9L9N9L9M9M9L9M9L9M9L9�:COG:8%9;:<9QP =�JLRKS;TUJ$>WV0HKJLX#FYR%Z[>WRGX#J

CLs9M9L9M9L9M9M9L9N9L9M9M9L9M9L9M9L9�:CO<O

���]\ � +1!A+7^_^W+7*/^_!4!$`�!#"$a7bc�%"'&d)�*/+1! �3�5�3�4�3�3�4�3�5�4�3�3�4�3�3�5�4�5�76[68%9QP%9;: e�fEfgJCVKfghihgjIhEBg@C?k>WBESml7VGJ#hnHG>WRGhporqQ>WRs>Wo;j%hgJ

ZH9L9M9M9L9M9L9M9L9�:CO<O

8%9QP%9QP t�fu>WS;BgJC?AJCR7BvHKJ#hnJCfEfgJCVKfghwhEj%hEBg@C?k>WBESml1VGJ#h39M9L9N9L9M9M9L9M9L9M9L9�:CO1x���my zN�G{(|1*}{ -}+~{(��{�&�bc&d"$+��3�4�3�3�4�3�5�3�4�3�3�4�3�5�4�3�3�4�3�3�5�4�5�76��

8%9Q�%9;: ��?4�Kom@C?AJCR7Bu>WBESmFYR.HKJ�o]>4o;S;?4S;BgJ�9M9L9M9L9M9M9L9N9L9M9M9L9M9L9M9L9�:CO1x8%9Q�%9QP =�S;?4S;BgJMFY�KBgJCR7VGJ�9M9L9M9L9M9N9L9M9L9M9L9M9M9L9N9L9M9M9L9M9L9M9L9�:CO1x

���;6 zN���,|1{�*/!'&(�[�~�4�3�3�4�5�3�4�3�3�4�3�5�3�4�3�3�4�3�5�4�3�3�4�3�3�5�4�5�%�s�� a1!_*/bca��3�4�5�3�3�4�3�3�4�5�3�4�3�3�4�3�5�3�4�3�3�4�3�5�4�3�3�4�3�3�5�4�5�%�[�

�����_�%�0���I�C�7�(���I� �W�K¡�����¢(�_�¤£¥�I�¥�¥¦W�_���_¡�¢d�W�§£¥���/¦W�¨�W�K¡C�ª©���«¥�]¡C�¤£��.¬r�%�¥£­®�¯°���~�I�G¡���¦_��I«¥�W«��±�$²��_³W��£¯°¦'´%³_�¥�W�0�W�K¡C���W�%�0���7¡��(©¥¢d�µ�Y´%�_�¶¢(������¦W�¨�W�¥�_� £¯·«¥�¸���d¹%���I¢

ZH£¥�I�¥��¢(�_�

£¥�%�¥�¥¦_�W�_º¼»5�d�¥���½­�£��I�¥�§�W�.�#¾¥�I�¥�d¡����~�¥�%«¥�§�Y�I¢d�W«¥¢d�%�¥�k¢���¢(�(�0�d¡��ª��«��/¦_���(�_«¥���.��«¥�§¢������W�'¡C�d�%���Ý0�Y�I�_�¿£¥�¿�����s£¥«¥�_¡��(�%�À£¥«�©,�%���I��£¥� ç �(¹%¹%�0�W��¬r�I�¥�_¡��(�%�À£¥�¿�C�¶�.�I�¨����£��I�¥��¢d���W�I���I¢ZH → e+e−bb

º ê �%«�� ¦'¡C«¥£��(�W�¨�%�¥��¢��L�u¡#�7¡��(�¨¡��(ÁG«¥�n£¥�p¡C�_�¨¡®«�¡C�d¢(�d��¦W�7­W�¥�I«¥� ´I�W�¨���%�¥� ¦W¹%�I¢(�_�~�_�G¡¢(�A¡C�C�7�d¡C�_�~�_�K¡Â£��W�5�_���¨�W«¥�¨�3�¨Ãs�¨¡�¦W�~�7¡C�dÁG«¥�W�_­}�_¡Â�W�lÞ��µ¢(�_�¢d�(�0�d¡C�_�L��«¥�,¦W�¨�(�_«¥���_�5¦_¡C�I©¥¢d�(�W�N��«��¢��ª���_�_¡��(�%�c��Ý0�Y�7�W�k£¥�A�¥���s£¥«¥�'¡C�(�I��£¥«�©,�%�¨�%��£�� ç �(¹%¹I�L���W�¨�%�K¡N�¥��¦_���W�K¡�¦W�W�_º

ÕVùlß ûg� ý6�d�x�H�ý6�H�¼~�$ü �;ü²�0ü�ý6�Ä +0/>+M/ ¥c7IGI2Q9�ÅB<¢?4A

CLs���¿¢d�(�0�d¡C�~�¿¦_¡�¦��Y�I¢d�W«¥¢d¦W��Ƶ���7�¨¡C�d�¤£¥��¢(���0¦_¡C¾��[£¥��£��W���¥�]´%�Y�7«[²�£¥���_�%�[Þ��I���W�CLsÇÉÈ �%�[Þ¥£¥�W�¥�_�¤���'´%�W¢d�#Ê S]ËIË<Ì U ­��(�0�¥¢(¦_�~�_�K¡C¦W�5£��I�¥�N«¥�c���I�#Í1�I¹%�A�(�[¬r�%���~�7¡C�dÁG«¥�3�I���/�_¢(¦ ÈLÎ �Ï��ÐgÑ ÇÉÈLÎ �[Þ�£¥�_�¥�W�.���_´%�_¢i��ÐE�0�d¡4Ñp´7�I¢d«��7¡��%�#Ê SmË%Ë<Ò U S]ËUÓ7Ô U SmËUÓ[Ë U º È �_¡¨¡C�0�~¦'¡C¾¥�s£¥�Õ��¦W¹K�I¢d�'Ï�~�_�G¡M¦'¡C¦A«�¡��(¢(�d��¦_�3���I�M¢(�_�L�W�%¢d¢��I©,�%���7¡C�d�%�¥����ÑnÖ SmËUÓ%Ó U S]ËUÓ7× U º

ËWØ¥Ë

Page 143: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

Ù �%�]¡�«¥�Ú¦W�#¾��7�G¡��(¢d¢(�%�øÞ��¥�I¢3�5Ús�¨�W�¥�¨¦W�¨�W�K¡C�¶¢(�¿�¥�I�ª©¥���µ£}¯°¦'´%³W���W�0�W�K¡C��£¥�Û���(¹I���I¢É­

b¢d�

�¥�%�ª©����N£¥�3©¥�¨«¥�d¡��w£¥�N¬r�%�¥£­s�_¡d¢(�N�¥�%�ª©����5£}¯°¦'´%¦W���W�0�W�K¡C�L�%©����W�u´%¦_�W­��I¢d�%���i¢��k�¨¡C�7¡C�d�¨¡C�dÁG«¥�

£¥�4¡C�_�¨¡Q�W�u¡N¢(�4�C�7�¥�/�I�¨¡M£¥�_�N�����%©��7©¥�(¢d�d¡C¦_� Ç ¢d�(Í7�W¢(�d¾¥�s�[£~�C�7¡��(�ª¡C�_�¨¡N�¨¡C�7¡C�d�¨¡��(�<Êi��«¥�]´I�7�G¡��W�­à

Q =L(s + b)

L(b),

Ç Ì º Ë Ê£��I�¥�4�_�_¡¨¡C�Õ¦WÁG«��7¡��(�%�

L(s + b)�W�u¡A¢����¥�¨�%©��I©��(¢(�]¡C¦§�/�%�d���¨�%�¥�(�_�¥�¥�ªÁG«¥�Õ¢½¯°¦_�#¾��I�K¡C�d¢(¢(�I��¡C�_�¨¡C¦

�W�%�K¡��(�W���¥�¿£¥«��¨�(¹%���7¢Â�'¡�£¥«�©¥�¨«¥�d¡.£¥��¬r�%�¥£}­v�_¡L(b)

�W�_¢(¢d��ÁG«¯·�(¢5���¿�W�%�K¡��(�W���¥�¿ÁG«¥�µ£¥«©¥��«��d¡w£¥�5¬r�%�¥£}º¥Ñp���W�%�����(£�¦W�C�7�G¡

L(s + b)�_¡

L(b)�W�%�0�~�N£¥�_�L�'²[�/¦_���d�W�¥�_�W�L£¥�3�_�%�0��¡#�I¹I�I­

¢É¯·�'²[�¥�¨�W���¨�(�%��£¥�Q�����W��£�¢��¤¬r�I���0�A�I£¥¦WÁG«��1¡C�7à

Q =e−(s+b)(s + b)d/d!

e−b(b)d/d!.

Ç Ì º Ó Ê���%���¨Ás«��¢½¯°�%�0���_�#¾¥�W�¨�#¾¥�3«¥�.���(¹I���I¢�£��I���w«¥���N´7�I�¨���I©¥¢d�®Þ����I¢d�Â�,�%«¥�n£¥�*�}¦_���_�G¡��w�W�I���I«s²

i­Q�W�u¡Â�W�I¢(�_«¥¢(¦_�4£��I�¥�M�#¾��7Ás«��§©¥�d�

j£¥�_�¾¥�d�¨¡��%¹%�C�7�~�0�W���¨«¥�d´7�I�K¡M¢(�Õ�_�%�ª©¥�d���I�d���%���¨«¥�d´7�I�K¡��/à

Q =canaux∏

i=1

bins∏

j=1

e−(sij+bij)(sij + bij)dij/dij!

e−bij (bij)dij/dij!

Ç Ì º × Ê

Q =

canaux∏

i=1

bins∏

j=1

e−(sij)

(

sij + bij

bij

)dij

.Ç Ì º Ø Ê

Ö®�%«��3���_�¥£¥����¢½¯°�$²[�¥���_�����d�%�µ£¥�Q¢(�d�¥¦Y�7�(���7­��_¡4£¥�I�¥�ª���d�~��¢(�LÞ¥�W�N¢É¯°�Uܨ�%«�¡5£¥�W�4�W�I���I«[²��_¡3£¥�W�

©¥�(���W­¥�%�c«�¡��(¢(�d���¢(�4¢(�I¹7ÏE¢d�(ÍI�_¢(�d¾¥�[�s£0�C�7¡��(� ÇLLR

Ê$­��¥�I¡C¦χ�_¡N£¥¦�Þ¥�¥�����I�°à

χ = −2ln(Q) = 2canaux∑

i

bins∑

j

(sij − dij ln(1 + sij/bij)).Ç Ì ºÞÝ%Ê

Ù �%�d�W�K¡dPb/dχ

�_¡dPs+b/dχ

­s¢d�W�w£¥�W�¥�¨�d¡�¦W�v£��5�¥�¨�%©��I©¥�d¢(�]¡C¦L£¥�_�LLR

�/�%«��w¢d�W�v¾KÃs�,�I¡C¾¥³_���_�©¥��«��d¡�£¥��¬r�%�¥£��¨�W«¥¢ Ç

LLRbʪ�_¡Õ�¨�(¹%�¥�I¢��¥¢d«¥�Õ©¥��«¥�]¡Õ£¥��¬r�%�¥£ Ç

LLRs+bÊ��¨�W�¨�/�_�_¡C�]´%�_�~�_�G¡Wº

Ñp¢(¢(�_�¤�¨�%�K¡��Y�I¢d�W«¥¢d¦W�_��Æ����I�u¡C�d�¤£¥�������W«�£¥�7ÏE�$²[�/¦_���(�_�¥�W�_�Õ�5Úߢ(�_�ª£ij���I�G¡�¡��(�¨¦W�ª�7«à¾��I�C�7��£

���_¢(�%��«¥�¥�A�u¡#�7¡��(�¨¡��(ÁG«¥�4�,�%�(�¨���%���(�W���¥�A£¥�4´I�7¢(�W«����~�<ÃI�W�¥�¥�b�'¡

s + b���_���,�W�_¡��d´I�W�0�W�K¡Yº

s�_¡

b£¥¦W�,�W�¥£��W�K¡�£¥�~���I�C�7�~³'¡C���_�§£��d¡§£¥�~�G«¥�d�C�I���W�W�_ºá���W�§���I���I�~³'¡C�¨�W�k£¥�.�G«¥�d�C�I�¥�_�W�

£��I�¥�M�_�_¡�¡��¤�7���I¢dÃs�¨�k�¨�%�K¡5¢d�W�M���I���I�0³_¡C�¨�W�MÁG«¥���(�K¡C�_�¨´s�(�_�¥�¥�_�G¡Â£��I���N¢d�A�Y�I¢d�W«¥¢�£¥�A¢(�Õ¢d�(�0�d¡��I­�W�%�0�0�c�¥�I�.�$²��_�~��¢(��¢(�¶¢d«¥�~�d�¥�%�¨�d¡C¦��I«�¢(�_�~�+Ý~�W�I�W�]¡C¦_�Wº����_�����I���I�~³'¡C�¨�W�.£����G«¥�(���I�¥�_�W��W�%�0�,�%�¨¡��W�K¡n£¥�W�i�W�¨���_«¥���v�I�¥�,�W¢(¦_�W�n�W�¨���_«¥���w�¨Ãs�¨¡�¦W�~�7¡C�dÁs«��W�Wº Î �0�/�_«�¡w¡��W�¥�d�p�W�%�0��¡��N£��Â�_�W��W�¨���W«����¤�_�à�W�%�K´I�%¢(«��7�G¡¤¢(�_«¥���k£¥�(�u¡C�¨�(©¥«�¡��(�%���¤�Y´%�_��¢(�_�§¢d�%�(�A£¥�.�/�%�d���¨�%�º È �W�ª£��W�����(³W�¨�W�§���¡C�¨�%«�´%�_�K¡~¦_¢��I�¨¹%�(�_���_¡0�%���,�W��£â£¥��¢��µ�¨�W�¥�¨�(©¥�d¢(�d¡�¦Iº¼� �µ£¥¦_¹%�C�7£��7¡C�d�%����«¥�Õ¢d����¦W�¨«¥¢d¡C�7¡�Þ����7¢���_�C��£¯Þ�7«�¡#�I�K¡§�¥¢(«��k�d�~�,�%�u¡#�I�K¡C��ÁG«¥�0¢(�_�A�W���¨�W«¥�¨�¤�¨«¥�

b�_¡

s + b�¨�W�¨�%�K¡ª�(�0�,�%�¨¡C�I�K¡C�W�_ºÐE¢

ËYØGÓ

Page 144: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

ã% u¡¢( Ì º Ë � Ѽ²[�W�0�¥¢(�A£¥�k£¥�(�u¡C�¨�(©¥«�¡��(�%���L£¥�W� LLR�/�%«��N¢d�W�M¾KÃs�/�I¡�¾¥³W�¨�W�3�¨�(¹%�¥�I¢��¥¢(«��N©���«¥�]¡

£¥��¬r�%�¥£ Ç £¥�(�u¡C�¨�(©¥«�¡��(�%�À£¥�¿¹K�7«¥�#¾¥�µ�W�Ú�¨�%«¥¹%�YÊ0�_¡�©���«¥�]¡�£¥��¬r�I�¥£����_«¥¢ Ç £��(�¨¡����d©¥«�¡C�d�%�ä£��£¥���%�]¡C�§�W�¿´%�_�¨¡��<Ê'º���§¡C�C�7�d¡Â���%«¥¹I�¤´%�_�¨¡C�d�Y�I¢ Ç Æ.¹%�I«¥�#¾¥�YÊ5���W����¦W�¨�W�K¡C�Õ¢(�0´7�I¢(�_«¥�5�_�W�K¡C���I¢(�¤£¥«LLR

�,�%«¥��¢É¯·¾KÃs�/�I¡�¾¥³W�¨�����d¹%���I¢w�¥¢(«¥��©���«¥�]¡�£¥��¬r�%�¥£}­¼¢(�~¡C�C�7�d¡��¥�I�(�§´I�W�u¡C�(�W�I¢ Ç �I«à�~�d¢(�d�W«�Ê���W����¦W�¨�W�K¡C�k¢��¤´7�I¢d�W«¥�v£¥�A¢É¯·�%©¥���_�¨´7�7¡��(�%�­s�_¡M¢d�3¡C���I�d¡w´%�W�u¡M´%�W�u¡C�d�Y�I¢ Ç Æª£¥���%�]¡C�YÊw���_�¥��¦_���W�K¡��¤¢��´I�7¢(�W«��L�W�W�K¡��C�I¢d�4£¥�A¢É¯·¾GÃs�,�I¡C¾�³W���k©¥�¨«¥�d¡M£¥�4¬r�%��£c�¨�W«¥¢½º

�W�¨¡v£¥�%�¥�N�(�0�,�%�¨¡C�I�K¡n£¥�5�_�%�K¡C� ÷ ¢(�W�i�W�_�v�_�����_«¥���w�_¡v�¥�I¡#�7�~�0�W�K¡i¢(�_�w�_�����_«¥���w�¨Ãs�¨¡�¦W�~�7¡C�dÁG«¥�W�_º���_�Â�_���¨�W«¥�¨�5�¨Ãs�u¡C¦W�~�7¡��(ÁG«¥�W�Â�¥���d���_�Â�_���W�I�~��¡��§£¥�I�¥�N�W�_¡¨¡C�§�I���I¢]Ãs���k���%�K¡Â¢(�(�u¡C¦_�W�N�W� Ì º Ó º Ë ­�_¡N¢(�_«¥���L�V�}�'¡C�N�%�K¡M¦_¡C¦A�0�(�¥�d�~�d��¦_�v�W�I�~�0�4�'²[�¥¢d�(ÁG«¥¦4�W� Ì º Ó º Ó º

���à���_�¥���d©¥�(¢d�d¡�¦¿�W�u¡��W�I�C�I�'¡C¦_���(�¨¦W�Û���I��¢(�ߣ¥�(�u¡#�I�¥�_�Û�W�K¡C�¨�¶¢d�W���0¦W£¥�(�I�¥�W�����7���C�7�G¡����I�¢(���¨�%�~�0�_¡¤£¥�W�Õ£¥�_«[²�£¥�d�¨¡����(©�«�¡C�d�%�¥�

LLRb

�_¡LLRs+b

­á£¥�d´s�d��¦W�.���I��¢É¯·¦W�W�I�¨¡¤¡EÃ[�,��£¥��¢��£¥�(�u¡C���d©¥«�¡��(�%�ࣥ�

LLRb

ºn���c¡��W�¨¡~���_�C�Û£¯°�I«�¡#�7�G¡~�¥¢d«¥�Õ�/�_�¨¬r�%�¨�.�I�K¡ÕÁG«¥�c�W�c�C�I���/�%�u¡0���W���¹%�C�I��£­¥�_¡M�I��ܨ«¥¹I�4Ás«}¯°«¥���4åE©/�%���¥�'æ5���_�¥���d©¥�(¢d�d¡C¦5£¥�%�d¡L�<´I�%�(�L«������I�¥�,�%�¨¡ ≥ 2

­¥´%�%�d��Þ�¹¥º Ì º Ë ºÖ®�%«¥�wÁG«��I�K¡C��Þ��W�i¢(�_�%Ú�«¥�'¡C«��1¡C�(�I�¥�w£�«

LLR�%©¥���_�¨´I¦W� Ç

LLRobs

Ê'­G£¥�W�v©��I�¥£¥�_�v�¨�W�¥�¨¦W���_�K¡#�I�K¡£¥�W�§¦W�Y�7�¨¡C�§£¥� Ë Ç Ó Ê4£¥¦_´s�(�7¡C�d�%� Ç �CÊ3�¨¡#�7�¥£��I�¨£ Ç �CÊ Ç ���I¡C¦_�

σÊA���%�K¡ª£�¦_¡C�_���0�(�¥¦_�W�¤�I«�¡C�I«¥�§£��

¢��k´7�I¢d�W«¥�w�Y�I¢d�W«¥¢d¦W�£��I�¥�w¢É¯·¾GÃs�,�I¡C¾�³W���4©���«¥�]¡v£¥�¬r�%�¥£����_«¥¢(�_�~�_�K¡Yº¥���¤����¦W�¨�W�¥�_�4£¯·«¥�����d¹%���I¢�W�¨¡5�Y�I���I�_¡�¦W�¨�(��¦_�¤���7�«¥���§£¥¦'´s���7¡��(�%���¥¦W¹K�1¡C�d´I�§£�� Ó �I« ×

�

LLRobs

���I�N�C�7�¥�/�I�¨¡5Æ~¢���~¦_£¥���I���3£¥�

LLRb

º

ËWØK×

Page 145: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

Ä +M/>+ZY ¥cAÒ34;«E>A7>N@?BA�^�<®3môÔ7>34^�ACLs�����¥�d´I�Y�I«�£¥�µ�_�%�[Þ��7�¥�W�µ�_�¨¡��W�I¢(�_«¥¢(¦�Æß���I�¨¡��(�~£¥�W�

LLRº Ù �%�d¡

CLs+b

¢½¯°¾KÃs�/�7¡C¾¥³_������d¹%���I¢/�¥¢(«¥�M©¥�¨«¥�d¡M£��A¬r�I�¥£��_¡

CLb

¢É¯·¾KÃ[�,�I¡�¾¥³W�¨�§©¥�¨«¥�d¡�£¥�k¬r�I�¥£����W«�¢É­��I¢d�%����à

CLs+b = Ps+b(χ ≥ χd) =

∫ ∞

χd

dPs+b

dχdχ

Ç Ì º°çKÊ

CLb = Pb(χ ≥ χd) =

∫ ∞

χd

dPb

dχdχ.

Ç Ì ºÞè%Ê

Ñp�[Þ��­/¢(�¤���d´%�W�I«µ£¥�ª�_�%�[Þ��7�¥�W�CLs

­/�W�u¡4¢(�§�C�I�¥�,�%�u¡3£¥�_�3£¥�W«s²µ�¥�¨¦W�W¦_£¥�W�K¡��A¡��W�¨�~�_�W­�Y´I�W����I�L�_�%�K´%�W�K¡��(�%��¢(�

CLs+b�I«��G«¥�0¦W���7¡C�_«¥� S]Ë<Ó7Ø U à

CLs =CLs+b

CLb.

Ç Ì º Ì Ê

ÕVù�é ûîü�ýÿü��d�¾ü����¾ý ý6áaý6�0þ�� ���H�¼~�$ü�ýÄ +�Y�+0/ ê�5J5]ANm5]C_CLª¢Cr9J2HGI7:98;=Ó�NBACK?47>34CKPV©w7>3B7®P«ª¢CLA

ZH

ê �%«¥�5£¥�(�u¡C�(��¹%«¥�%�¥�£¥�W«s²¿¡EÃs�/�_�4£¯·�W���¨�W«¥�¨�4�¨Ãs�¨¡�¦W�~�7¡C�dÁG«¥�W��à,¢(�_�3�W�¨���W«����4£¥�]¡C�W�Låg�¥¢(�7¡C�_�uæ�%« åg¢d�(���¨�W�gæ Ç Ú��7¡0�¨Ãs�¨¡��W�~�7¡C�d�W�#ʪ�¨�%�K¡~¢d�W�Õ�W�¨���_«¥���0£¥�W�ÕÁG«��I�K¡��d¡C¦_�~�_�%�0�~��¢d�W�ª¬��I�'¡C�W«����0£¥��¥�%�¨�.�I¢d�(���7¡C�d�%�­��%«Û¢(�_�3���_�_¡��(�%�¥�A�+Ý~�W�I�W�_�W­��_¡���ºdº]º]­ÁG«¥�p�¥���#¾��I��¹%�W�K¡§¢(�W�5£¥�(�u¡C���d©¥«�¡��(�%�¥�5£¥�ëÂìíÁG«¯Þ�Y´I�W�A«¥��¬��I�'¡C�W«��v�W�I�¥�¨¡C�I�K¡-å¥�_¡v¢(�_���W�¨���W«�����£¥�]¡C�_�v£¥�Nåî¬r�%���0�'æ Ç ��¾��7�/�3�uÃs�¨¡C�_�.�1¡C�(�_�#Ê$­���%�K¡v¢(�W�w�W�¨���W«����L£¥�_��ÁG«��I�K¡C�]¡C¦W�vÁs«��}���I�G¡v��«¥�¨�W�_��¡C�d©¥¢(�_�L£¥�5�#¾��7�¥¹%�W�v¢��k¬r�I���0�£¥�_�L£¥�(�u¡C�¨�(©¥«[Ï¡C�d�%�¥��£¥�§ëNìvº ÈLÎ ����ÐgÑâ¡C�C�7�d¡C�5�W�W�N£¥�_«[²�¡EÃs�/�_�£¯·�W�¨���_«¥�M£¯°«��¥�A�.�I���(³W�¨�4£¥���/¦W�¨�W�K¡C�7ºÎ �í£��(�¨¡��(�¥¹I«¥��¦W¹K�7¢(�W�0�W�K¡k¢(�_�4�W�¨���W«����3åg�W�I����¦_¢(¦_�W�uæ��_¡3åg�d�¥£¥¦W�,�W��£��I�K¡C�_�uæ;à�¢d�W�A�W�¨���W«����k�W�%�gÏ��¦_¢(¦W�_�5�¨�%�K¡4¢(�_�5�W�¨���_«¥���4£¥�_�3���I���I�0³_¡C�¨�W�ÂÁs«��¼���I�G¡3�W�%�0�ª«¥�¥�Â�/�I«¥�5¢d�W�5£����/¦W���_�K¡C�5�W�I���I«s²�W�%�0�0�w¢(�5¢(«¥�0�(���%���]¡C¦I­<¢d�W�á�¨�W�'¡C�(�I�¥�á��Ý0�W�I�W�_�W­K�%«ª¢d�W�¼¬��7�_¡C�_«¥���p£����¥�%�¨�.�I¢d�(���7¡C�d�%�

kjZ

åI�'¡p¢(�_��W�¨���W«����p�(��£¥¦W�,�W�¥£¥�I�K¡C�W�n�¨�%�K¡n���I�p�'²[�_�~�¥¢d��¢(�_�á¬��I�_¡��W«¥�¨�p£¯·¦W�#¾¥�_¢(¢(�L£��W�p��Ý0�W�I�W�]¡C¦W�

kiε

­%�%«�¢(�_��W�s��Ý0�W�d�W�K¡C�5£¥«¿©¥�¨«¥�d¡5£¥�¤¬r�%�¥£��ª«¥¢d¡��Qܨ�'¡

αij

­}�'¡3�_¢(¢(�_�5�¨�%�K¡4�I�¥��¢(�(ÁG«¥¦_�W�3�d�¥£¥¦_�/�_�¥£��I�0�~�_�K¡�I«[²��Y�I���7«[²/º

�3ïUï1ðL��ïÒÙ/ÙVæ0Ù_ñsaLe�Ì�ñ¡Ê.é6��ð�Ù7Ó Ê"ÙyÙWð�Ù− ���_�¤�_�¨¡C�d�.�1¡C�(�I�¥�A£¥�W�ª�_���¨�W«¥�¨�ª�¨Ãs�¨¡�¦W�~�7¡C�dÁG«¥�W�ª�_�%�0�ª«¥�¥�_�¤���I�G¡¤�~�I�G¡���¦_�W�¤£¥�I�¥�ª¢d�0¡C�1Ï©¥¢(�W�I« Ì º Ë ºp�3�I�¥�0¢��µ£¥�_���¥�d³W�¨���_�%¢(�%���¥���W�u¡.�d�¥£¥�(ÁG«¥¦_��¢��¿¬r�C�I�'¡C�d�%�����I�Õ�C�I���/�%�u¡~�I«À©���«¥�]¡£¥�ª¬r�%�¥£¿¡��I¡#�7¢Éº/Ö¼�I�4�$²��_�~��¢(�I­/«¥�¥�Õ�W�¨���_«¥�4£¥� ÓIÔ ï ÁG«¥�p�p�/�W�'¡C��£¥� ËYÔ ï ¢d�¤©¥�¨«¥�d¡4£��ª¬r�%�¥£�W�%�¨���_���,�%�¥£¶Æ Ó ï º σCOR

ε

�W�u¡§�_���¨�W�K¡C�d�W¢(¢d�W�0�W�K¡A¢É¯·�W�¨���_«¥�A��«¥�4¢d�ª¬��I�_¡��W«¥�kL ∗ k0

Z

­´%�I�(�4ÑpÁ�ºè[º Ó ºp�p¯·�W���¨�W«¥��� Ç » ì � Ê Ç � Ç Ñ È Ê¤�,�%«¥�ª¢(��¡C�%�,�%¢d�%¹%�(� ÈLÈ ÏgÑ È Ê¤¡C�d�W�K¡��_�%�~�[¡C��£¯·«¥�¥���W�¨���_«¥�£¥�%�K¡4¢½¯°�%�¨�(¹%�d�¥�k�W�¨¡A¢(�.¢(«��~�d�¥�%���]¡C¦§�I�W�_��«¥���,�%«¥�5¢(�W�AëM«¥�¥�4ШÐE©µ�_¡AÁG«¥�¼¬��7�d¡3ÁG«¥��¢d�W�5´7�I¢d�W«¥�¨�£¥�

k2Z

£¥¦_¡��W�¨�~�d�¥¦W�_�3��¦_���I��¦_�~�_�K¡4�/�I«¥�5¢d�W�4ëM«¥�¥�3ШÐg�.�_¡5Ð�ÐE©­/���%�K¡4£����/¦W���_�K¡C�W�3�I«[ÏE£��W¢�Æ~£¥�¢É¯·�W�¨���W«��L�¨¡#�1¡C�(�u¡C�dÁs«��Iº− ���W�k�W�u¡C�(�~�7¡��(�%�¥�4£��W�k�W���¨�W«¥�¨�¤�uÃ[�u¡C¦_�.�7¡��(ÁG«¥�_�¤�I���¥¢(�dÁs«�¦W�W�k��¦_���I�¨¦W�0�W�K¡¤£¥�I�¥�k¢(�W�A£¥�*�}¦$Ï���_�G¡��~�W�I���I«s²â���%�K¡��0�%�K¡C�¨¦W�_�~£��7�¥�~¢d��¡#�I©¥¢d�Y�I« Ì º Ó ºi�p¯°�d�K¡C�W�u´%�_�G¡��(�%�À£¥�W�0�W�¨���_«¥���~�¨Ãs�¨¡�¦'Ï�.�1¡C�(ÁG«¥�_�4£��I�¥�A¢d�W�A£¥���/¦W�¨�W�K¡C�k�Y�7���I«[²Û�_�¨¡§�~�I�G¡���¦_�0£¥�I�¥�A¢(��¡#�7©¥¢(�W�I« Ì º × º Î �íõ�0�%�K¡C�¨�

ËYØ%Ø

Page 146: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

Ù Ãs�¨¡��W�~�7¡C�d� £ �¥�_�W�¨¡C�I�(�K¡EÃ Ç ï Ê ©¥ÍG¹ Ç ï ÊσCOR

ε

ç Ô ºÞèk2

Z

Ç ëM«¥��ШÐg�KÊ Ë º Ë Ô º Òk2

Z

Ç ëM«¥��Ð�ÐE©�Ê Ô º Ò Ô ºÞèk2

Z

ÇÉÈLÈ ÏEÑ È Ê Ë º Ì� Ç » ì � Ê è Ô º Ì� Ç Ñ È Ê Ë<×

Z + HF²[���_� ÓIÔ Ë<Ô º Ò

tt²[���W� Ë<Ô Ô º Ò

�5�d©/�I���%��²[���_� è ï Ô º Ó ïZH

²��¨�W� ç#%$'&)( Ì º Ë � Ñp�¨���W«����p�¨Ãs�u¡C¦W�~�7¡��(ÁG«¥�W�¼�W���,�%«¥���_�W�K¡#�7¹%�I­1��«¥�¼¢��Â���%���~�I¢(�d�C�7¡��(�%�4�'¡p¢(�_�¼�¨�W�_¡��(�%�����Ý0�Y�I�_�W�_­,�_�%�0�ª«¥�¥�_�N�,�%«¥��¡��%«¥�M¢(�_�L�Y�I�¥�I«[²/º

ëM«¥��Ð�Ðg�

i eeÇ ©¥ÍG¹GÊ Ç ï Ê eeicr

Ç ©�Ís¹KÊ Ç ï Ê µµÇ ©�Ís¹KÊ Ç ï Ê µµtrace

Ç ©¥ÍG¹GÊ Ç ï Êσi,IND

ε

Ó Ç Ë º Ì Ê Ø Ç × º°çKÊ Ó Ç Ó º Ô Ê × Ç Ó º Ø Êò�«¥¢]¡C�Qܨ�'¡ ÓIÔ Ç Ó ºóÝIÊ ç Ô Ç ç�º Ë Ê Ý Ô Ç Ë º Ë Ê Ý Ô Ç ËYÔ Ê

ëN«¥���NШÐE©

i eeÇ ©¥ÍG¹GÊ Ç ï Ê eeicr

Ç ©¥ÍG¹GÊ Ç ï Ê µµÇ ©¥ÍG¹GÊ Ç ï Ê µµtrace

Ç ©�Ís¹KÊ Ç ï Êσi,IND

ε

Ó Ç Ë º°çKÊ Ø Ç Ë º Ò Ê Ó Ç Ë º Ò Ê × Ç Ë º Ò Êò�«¥¢d¡��Qܨ�'¡ ÓIÔ Ç Ø º Ó Ê ÓIÔ Ç Ë%Ë Ê ×%Ô Ç Ô º Ò Ê ÓIÔ Ç è[º Ô Ê

#%$'&)( Ì º Ó � Ñp���¨�W«¥�¨���¨Ãs�u¡C¦W�~�7¡��(ÁG«¥�W�L�_���,�%«¥���_�W�K¡#�7¹%�I­[��«¥��¢(�§�¥�I���~�I¢(�d�C�7¡��(�%�Õ�,�%«¥�v�#¾¥�IÁG«¥��Y�I���7«[²/­��_¡N�/�I«¥�L¢(�_�ÂëM«¥�¥�MШÐg� Ç �W�c¾��I«�¡#Êv�_¡NÐ�ÐE© Ç �_��©¥�I�#Ê$º

¦W¹K�I¢d�W�0�W�K¡Â��� ¢É¯·�W���¨�W«¥�Â�W�u¡4�I�¥��¢(�(ÁG«¥¦_�¤�d�¥£¥¦W�,�W��£��I�0�~�_�G¡Â�%«����¼�_¢(¢d�k�_�¨¡4�_�%���¨¦W¢d¦W�¤�_�K¡C���§¢(�_�ëN«¥���NШÐg���_¡NÐ�ÐE©º

�5ï1ïUðL��ïqÙ7Ùlæ-Ù_ñsaLe�Ì�ñ~Êwé6��ð�Ù/Ç�ðå� Î,ï�e ð���_�ª�W�¨���_«¥�����uÃ[�u¡C¦_�.�7¡��(ÁG«¥�_����«¥�ª¢(��¬r�%�¨�~�~£¥��¢���£¥�(�u¡C���d©¥«�¡��(�%�í£¥«�ëNìô���%�K¡��_�¨¡C�d�~¦_�W�ª�_�¬��I�(���I�K¡L´I�7���(�_�L¢(�_�N�¥�I�C�I�0³_¡����_�N�$²[�/¦_���(�0�W�K¡C�I«[²�£¥� ±1σ

­��'¡Â�_���0�W�¨«¥�C�7�G¡N¢½¯°�V�}�'¡Â£��§�_�_¡�¡��´I�7�����1¡C�(�I�.��«��N¢(�§´7�I���(�I©¥¢d��Þ����7¢(�Iº¥�n¯°�I�0�¥¢(�]¡C«¥£��5£¥«��#¾��I��¹%�W�0�W�K¡N£¥�4�W�'¡�¡��k£��W�����(³W�¨�4£¥�%�¥���¢É¯·�W���¨�W«¥�n�uÃ[�u¡C¦_�.�7¡��(ÁG«¥�7º[���_�i´7�I¢d�W«¥�¨�i�_�.�0�<Ã%�W���¥�N¡����%«[´%¦W�_�v�,�%«¥�n¢(�_�iëN«¥���wШÐg�k�'¡wШÐE©.�¨�%�K¡���W¹I���%«¥�,¦W�_�M£��I�¥�M¢(�_��¡#�I©�¢(�Y�7«[² Ì º Ø �/�I«¥�L¢É¯·¦W�#¾��7�G¡��(¢d¢(�%� ËWõ ­¥�_¡ Ì ºÞݪ�/�%«��L¢É¯·¦W�#¾��I�K¡��(¢(¢d�%� Ó �pºÎ ���_�%�¥���d£¥³W�¨�7à

� �p¯°�d£¥�W�K¡C��Þ��Y�1¡C�(�I�k£��W��ܨ�'¡C� ÇÉö �_¡®Ðj�4Ê$­7¢½¯°�d�~���7�_¡�£¥�_�¼�d�¥�W�_�¨¡C�]¡C«¥£��W� £¥�v¢½¯°¦_�#¾¥�W¢d¢(�n£¯·¦W�¥�_��¹%�d�£¥�W�¼Ü¨�'¡C� ÇÉö Ñ Ù Ê$­��_¡N¢��ª�¨¦W���I¢(«�¡��(�%���W�c¦W���W��¹I�(�4£¥�_�pܨ�'¡C� Ç ëNÑ Ù Ê�å

�¸÷PT

àK¢��4���_�/�I�¥£¥¦W���7¡C�d�%�Õ£¥�N¢É¯·�(�0�¥«¥¢(�¨�(�%�k¡C���I�¥�¨´I�W�¨���3£¥«0©,�%���%� ÷ �,�%«¥�n¢d�W�n�¥���s�W�_���¨«¥�Z + jets

å

ËWØ Ý

Page 147: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

ò�«¥¢d¡��Qܨ�'¡Z + LP Z + HF

�5�(©,�%���I�tt ZH

ëM«¥��ШÐg� ì ШÐE©ò�«¥¢]¡C�øܨ�_¡ ù ÐE�¥£¥�W�,�W��£¥�W�K¡k2

Z

ù ù ÐE�¥£¥�W�,�W��£¥�W�K¡σi,IND

ε

ù ù ù ù ù ÐE�¥£¥�W�,�W��£¥�W�K¡σCOR

ε

ù ù ù È �%���¨�W¢(�7¡C�_£� Ç » ì � Ê ù ù ù ÐE�¥£¥�W�,�W��£¥�W�K¡� Ç Ñ È Ê ù ù ù ÐE�¥£¥�W�,�W��£¥�W�K¡

Z + HF²[���_� ù È �%�¨���W¢(�7¡C�_£

�5�d©/�%�¨�%��²[���W� ù È �%���¨�W¢(�7¡C�_£tt²��¨�W� ù È �%���¨�W¢(�7¡C�_£

ZH²[�¨�W� ù È �%���¨�W¢(�7¡C�_£

#%$'&)( Ì º × � »Â�¥�¥¢d�(�Y�7©¥�(¢d�d¡C¦®£¥�W� �W�¨���_«¥���®�¨Ãs�¨¡�¦W�~�7¡C�dÁs«��W�¼�¨«¥� ¢��L�¥�%�¨�.�I¢d�(���7¡C�d�%�3�_¡®¢(�_�®�¨�W�'¡C�(�I�¥���Ý0�Y�7�W�W�M�,�%«¥�L�#¾��7Ás«��k¦_�#¾��I�K¡C�d¢(¢d�%�­��'¡M�W��¬r�%�¥�'¡C�d�%��£¥�A¢��¤�_�%���¨¦W¢(�7¡C�d�%���W�K¡����A¢(�_�MëN«¥���LÐ�Ðg��_¡MШÐE©º

� Öp�3ì à�¢É¯·�l�/�_¡�£�«±�#¾¥�I�]²�£��W��¬r�%�¥�_¡��(�%����£¥�Û£¥�W�����d¡�¦Û£¥�Û���I�¨¡��%�¥� Ç Ö��5ì�àLÖ®�I�¨¡��%��5�_�¥���]¡EÃ�ì�«¥�¥�'¡C�d�%��Êi£��W�®Ü¨�_¡�����«���¢É¯°�I�W�_�W��¡C�I�¥�_�3£¥«����d¹%���I¢/�ª¦_¡�¦3�0�W��«���¦ SmËUÓ Ý U SmËUÓ ç U å

� õ ëNì ç ì:à�¢��¤´7�I¢(�_«¥�M�7¡¨¡C���d©¥«¥¦_�AÆÕ¢½¯°�+Ý0�Y�I�_�d¡C¦4£}¯°¦'¡C�(ÁG«¥�'¡#�I¹I�k£��W�áܨ�_¡C�M£¥�A©8å� õ ëNìÀ��ì:ॢ(��´7�I¢d�W«¥�M�1¡�¡C�¨�(©¥«�¦W�AÆ�¢É¯·��Ý0�Y�7�W�d¡�¦4£¯·¦_¡C�dÁG«¥�_¡C�I¹%�A£¥�W�áܨ�_¡��M¢(¦W¹I�W���íå� õ �I¹%¹K�7©¥�(¢d�d¡EÃx६��I�_¡��W«¥�M£¥�A�_�%���¨�W�_¡��(�%��£¥�A¢(�¤¡#�I¹%¹%�I©¥�(¢d�d¡�¦5£¥�_�áܨ�'¡C�å��ú ܨ�_¡¤ë! à��W�¨���W«��k�uÃs�¨¡C¦_�.�1¡C�(ÁG«¥�0£¥�Õ¢����¨�W�¥�%�¨�.�7¢(�(���7¡C�d�%�¿£¥�_�§�����s�W�W�¨��«¥�

Z + jets�¨�(�ª«¥¢d¦W�å� õ ���d¹xà�¢(�¤´7�I¢(�_«¥�M�7¡�¡����d©¥«¥¦W�A�7«c¬��I�'¡C�_«¥�L£¥�A�W�%�¨���_�_¡C�d�%��£¥«�¡C���d¹%¹%�_�å� ò�� ò à¥�W�¨���W«��N�uÃs�¨¡C¦_�.�1¡C�(ÁG«¥�§�I�¨���s�W�(¦_�A�I«c�.�7¡��#¾¥�(��¹>å� »Â¢(�¥¹%�_� Ù �Y�7¢(�&ॢ(�¤���_�/�I�¥£¥¦W���7¡C�d�%��£¥�3¢(�ª���d�ª«¥¢��1¡C�(�I�~»Â¢(�¥¹%�_���/�I«¥���W�I�����d¹%�W�v¢��¤�_�(�¥¦$Ï�~�7¡C�dÁG«¥�4£¥�W�¼Ü¨�'¡C�N�W�¨¡Â�I���¥¢(�dÁs«�¦W�A�I«��¥�¨�[�_�W���¨«¥�

Z + jetså

� »Â¢(�¥¹%�_� £ Ñâà}�W���¨�W«¥�A�uÃ[�u¡C¦_�.�7¡��(ÁG«¥�Õ�I�¨���s�W�d¦W�Õ�I«[²µ���I�C�7�~³'¡C���_�3«�¡��(¢(�d��¦_�3£��I�¥�4¢(�����mÏ�ª«�¢��7¡��(�%���,�%«¥�M¹%¦_�¥¦W�¨�W�M¢(�_�M�(�K¡C�_�C�I�'¡C�(�I�¥��£¥�_�Â���7�¨¡C�I�¥�M���,�W�_¡C�7¡C�_«¥���_º

ËYØ ç

Page 148: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

ëM«¥��Ð�Ðg�

ZHÇ Ë%Ë ÝIÊ Ç ï Ê Z + LP

Ç ï Ê Z + bbÇ ï Ê Z + cc

Ç ï Ê �5�(©,�%�¨�%�tt

ò�«¥¢]¡C�øܨ�_¡ö Ñ Ù Ó º Ø Ë º Ô × ºÞÝ Ë ºóè × ºÞÝ Ø º ÔëÂÑ Ù × º × × º Ò Ì º Ò è[º Ì Ý[º Ø Ý[ºÞÝö �_¡NÐj� Ë º Ô Ô º°ç Ô ºÞÝ Ô º Ø Ô º°ç Ô ºÞè÷ � õ Ó º Ó Ó º × Ó º ËÖp�3ì Ô º Ò Ô º°ç Ë ºÞè Ô º Ò Ô º Ó Ô ºÞè

õ ëNì ç ì Ë º Ô Ó º × Ø º Ô Ô º Øõ ëÂì���ì Ë ç × º Ì Ë º°ç¡#�7¹%¹K�I©¥�d¢(�]¡EÃ Ó º Ø Ó º Ó Ó ºÞÝ Ó ºóÝ Ó º Ø Ó ºÞÝú ܨ�_¡Âë6! Ô º Ò Ô º Ò Ô º Òµµ

õ ���d¹ Ë º Ò Ë º Ò Ó º Ô Ó º Ë Ó º Ó Ë º Òµµtrace õ �¨�(¹ Ø º Ì Ø º°ç Ø º Ì Ø º Ò × º Ì Ý[º Ø

ò�� ò Ô º Ë»5¢(��¹%�W� Ù �W�I¢(� Ô º ÔIØ Ô º Ë Ô º ÔIØ»5¢d�¥¹%�W� £ Ñ Ô º Ë Ô º Ë Ô º Ô è

ëN«¥���NШÐE©

ZHÇ Ë%Ë ÝIÊ Ç ï Ê Z + LP

Ç ï Ê Z + bbÇ ï Ê Z + cc

Ç ï Ê �5�(©,�%�¨�%�tt

ò�«¥¢]¡C�Qܨ�'¡ö Ñ Ù Ë º Ò Ô º Ò Ó º Ø Ó º Ì × º Ë × º ÌëÂÑ Ù Ë º × Ó º Ó Ø º Ò × º × Ë ºÞÝ Ó º Øö �_¡MÐj� Ó º Ò Ô º Ó Ë º Ó Ô º Ó Ý[ºÞÝ × ºÞÝ÷ � õ Ó º Ø Ó º°ç Ó º ×Öp�3ì Ë º Ô Ô ºÞè Ë º°ç Ë º Ô Ô º Ó Ô º ×

õ ëNì ç ì Ô º Ô%× Ó º × × ºÞç Ô º Øõ ëÂì���ì ËYÒ Ø º Ô Ø º Ó¡#�7¹%¹K�I©¥�d¢(�]¡EÃ Ô ºÞç Ô º Ø Ô º Ø Ô ºóÝ Ô ºÞè Ô ºÞèú ܨ�_¡Âë6! Ô º Ò Ô º Ò Ô º Ò

µµõ ���d¹%¹%�W� Ë º Ì Ë ºÞè Ë º Ì Ë º Ì Ë º Ì Ë ºÞè

µµtrace õ �¨�(¹%¹I�W� × ºÞç × º°ç × º × × ºÞç × º × × º Øò�� ò Ô º Ô%×

»5¢(��¹%�W� Ù �Y�7¢(� Ô º Ô�Ë Ô º Ô è Ô º ÔIØ»5¢d�¥¹%�W� £ Ñ Ô º Ô%Ì Ô º Ë Ô º Ô è

#%$'&)( Ì º Ø � Ñp�¨���W«����i�¨Ãs�¨¡�¦W�~�7¡C�dÁs«��W�i�W�.�,�%«¥�¨�W�_�G¡C�I¹%�7­s�¨«¥�i¢(�W�n£¥�*�}¦_���_�G¡��w�¥�I�C�I�0³_¡����_�i�,�%«¥��#¾��IÁG«¥�k¦W�#¾��I�K¡��(¢(¢d�%��£¥«c¢(�I¡ Ë ú õ ­��,�%«¥�L¢d�W�NëN«��¥�MÐ�Ðg� Ç �_��¾��7«�¡$Ê��_¡MШÐE© Ç �W�c©��I�CÊ'º

ËWØ è

Page 149: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

ëM«¥��Ð�Ðg�

ZHÇ Ë%Ë Ý%Ê Ç ï Ê Z + LP

Ç ï Ê Z + bbÇ ï Ê Z + cc

Ç ï Ê �5�(©,�%���I�tt

ò�«¥¢d¡��Qܨ�'¡ö Ñ Ù × º Ë Ë º Ô × º Ô × º Ó × ºÞè × º ØëÂÑ Ù × ºÞÝ Ø º Ò ËUÓ Ë<Ô × º Ì × º Òö �_¡NÐj� Ë º Ë Ô ºÞè Ô ºóè Ô º Ì Ô º°ç Ô º Ì÷ � õ Ó º Ó Ó º Ë Ë º ÒÖp�3ì Ô ºÞè Ô º°ç Ë ºóÝ Ô ºÞç Ô º × Ô ºóè

õ ëÂì ç ì Ý[º°ç Ø ºÞç Ýsº × ç�ºóÝõ ëÂì���ì Ø º Ò Ø ºÞÝ Ô º Ø¡#�I¹I¹K�I©¥�d¢(�d¡EÃ Ø º Ò × º Ò Ø ºÞç Ø º Ë Ø ºÞÝ Ý[ºóÝú ܨ�'¡Në6! Ô º Ì Ô º Ò Ô º Òµµ

õ ���(¹ Ó º Ô Ó º Ë Ó º Ë Ó º Ë Ó º Ó Ó º Ôµµtrace õ ���d¹ × º Ì Ý[º Ô Ø º Ò Ø ºóè Ø º Ø ç�º Ø

ò�� ò Ô º ӻ¢(�¥¹%�_� Ù �Y�I¢d� Ô º Ë Ô º Ô[Ë Ô º Ô ç»5¢(��¹%�W� £ Ñ Ô º Ë Ô º Ë Ô º ×

ëN«��¥�MÐ�ÐE©

ZHÇ Ë%Ë Ý%Ê Ç ï Ê Z + LP

Ç ï Ê Z + bbÇ ï Ê Z + cc

Ç ï Ê �5�(©,�%���I�tt

ò�«¥¢d¡��Qܨ�'¡ö Ñ Ù Ó ºÞè Ô º Ø Ó ºóÝ × º Ô Ý[º Ë × º ËëÂÑ Ù Ó º Ô Ë º × è[º Ò × ºóè Ø º Ó Ô º Òö �_¡NÐj� × º°ç Ô º Ó Ô ºóÝ Ô ºóè Ó º Ì Ø º Ø÷ � õ Ó ºÞÝ Ó º × Ó º ËÖp�3ì Ô ºÞè Ô ºÞè Ë ºóÝ Ë º × Ô º Ë Ô º Ø

õ ëÂì ç ì Ý[º Ô Ø º Ë Ø ºóÝ ç�ºóèõ ëÂì���ì Ø º Ì Ø º Ø Ë º Ô¡#�I¹I¹K�I©¥�d¢(�d¡EÃ Ô º Ò Ô º Ì Ô º Ò Ô º Ì Ë º Ô Ë º Óú ܨ�'¡Në6! Ô º Ò Ë º Ô Ô º Òµµ

õ ���(¹ Ë º Ì Ó º Ë Ë º Ò Ë º Ì Ó º Ó Ë º ̵µtrace õ ���d¹ × ºÞÝ Ø º Ø × º Ì × º Ô × ºÞè × ºóè

ò�� ò Ô º ˻¢(�¥¹%�_� Ù �Y�I¢d� Ô º Ô ç Ô º Ô%Ó Ô º ÔKÓ»5¢(��¹%�W� £ Ñ Ô º Ô�Ë Ô º Ë Ô º Ó

#%$'&)( Ì ºóÝ � Ñp�����_«¥���w�¨Ãs�¨¡�¦W�~�7¡C�dÁG«¥�W�i�W�~�/�%«����W�_�K¡#�I¹%�7­G��«¥�n¢(�_�w£����/¦W���_�K¡C�n���I���I�~³'¡C�¨�W�n�/�I«¥��#¾��IÁG«¥�k¦W�#¾��7�G¡��(¢d¢(�%��£¥«c¢(�7¡ Ó �p­¥�,�%«¥�L¢(�_�NëN«¥���NШÐg� Ç �W�c¾��I«[¡$Ê��_¡NÐ�ÐE© Ç �W�c©��I�#Ê$º

ËYØKÌ

Page 150: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

Ä +ZY�+�Y û�587®;�9JAHGIA3%9_?BAC_A65J5]ANm5]CKCLª�C¨9J2HGI7:9J;0Ó,N4AC���0¡C�W�u¡ª�u¡#�7¡��(�¨¡��(ÁG«¥�

QÇ �'¬gº Ì º Ë Ê4£¥¦W�,�W�¥£ £¥�W�ª�_���¨�W«¥�¨�¤�¨Ãs�u¡C¦W�~�7¡��(ÁG«¥�W�_º È �_�ª£¥�W�¨�¥�(³_���_�

¦W¢��7��¹%�d�����_�K¡A¢(�W�3¬r�I�¥�_¡��(�%�¥�4£���£¥�W�¥�¨�d¡�¦0£��0�����%©��7©¥�(¢d�d¡C¦§�_¡A�¨¦W£¥«¥�d���_�G¡§£¥�%����¢(�W�A£¥�_�¥���]¡C¦_�k£���¥���%©¥�I©¥�(¢d�d¡�¦Iº È �W�W���4�,�%«¥�p�V�}�'¡w£��L��¦W£�«¥�(�¨�N¢d���,�%«�´%�I�(�p£¥�d���W�¨�(�0�(���7�G¡¼�W�K¡C�¨�M���(¹I���I¢¥�'¡n©¥��«¥�]¡YºÖ®�%«¥�Õ�0�(�¥�d�~�d���_�¤¢É¯·�(�0���I�'¡ª£¥�_�~�_���¨�W«¥�¨�~�uÃ[�u¡C¦_�.�7¡��(ÁG«¥�_�W­n�%�â«�¡C�d¢(�(�¨��¢��µ�0¦_¡�¾¥�[£���£¥�d¡��c£��Ön�¨�fÞ�¢d�A���dÍI�_¢(�(¾��[�s£ SmËUÓ è U S]ËUÓ7Ì U ÁG«¥���_�%�¥���d�¨¡��§Æ�£¥¦'¡C�_���0�(�¥�_��¢(�4�0�W�d¢(¢(�_«¥�w�Uܨ«¥�¨¡��W�0�W�K¡N�W�K¡C�¨�¢(�W��©¥�¨«¥�d¡���£¥�p¬r�%�¥£k�_¡®¢(�W��£¥�I�¥�¥¦W�_�Wº1�p¯Þ�<ܨ«¥�¨¡��W�0�W�K¡®´7�M�.�U²��d�~�d���_�«¥�A¡C�W�u¡¼£��i´s�C�7�(���_�ª©¥¢(�I�¥�W�Ç �%«ª¢d�(Í7�W¢(�d¾¥�s�[£�Ê}�_�K¡C���v¢(�W�¼£¥�%�¥�¥¦_�W�p�'¡á¢(�_�¼©¥�¨«¥�d¡��ᣥ�v¬r�I�¥£­1�W��¦_¡C�I�K¡p���I���I�0¦_¡C�¨¦w�_�ª¬r�%�¥�'¡C�(�I�£¥�W�4���7�C�I�0³_¡����W�5£¥���G«¥�(���I�¥�W�_�4�_¡A£¥�¤¢(�W«��3�(�¥�_�W�u¡C�d¡�«¥£¥�_�W­}�_��ÁG«¥�¼´7����¦_£¥«¥�(�¨�ª¢(�_«¥���5�W���¨�W«¥�¨��_¡Â�I�(�����¢½¯°¦_¢��I�¨¹%�(�¨���W�0�W�K¡L£��W�M£¥�(�u¡C�¨�(©¥«�¡��(�%����£¥�W�

LLRº

ÕVù@ú õö�» l¹��� _�$ü l� ll� ��0üÄ +w-�+M/ ü G�ÆÔP=2HGIA3%9J7:98;=<>3 ?4A�P=7 P=;0GI;�98A

���_�¢d�(�0�d¡C�_�����I�G¡5�Y�I¢d�W«¥¢d¦W�_�ÂÆÕ���I�u¡C�d�N£��§£¥�_«[²��W�u¡C�(�~�7¡��W«¥�¨�N£��CLs

­CLexp

s

�'¡CLobs

s

­£¥�W��¦_Ás«¥�7¡C�d�%�¥� Ç Ì ºÞçIʧ�_¡ Ç Ì ºóèIÊ'º

CLexps

Ç ¢d�(�0�d¡��~�1¡�¡C�_�¥£¥«¥�Yʤ�W�u¡Õ¢(���W�I���5Úà¢��c´I�7¢(�W«��ª£¥��¢���W�%«¥��«¥���

χd

�W�I�����_���,�%�¥£ Æ�¢(���~¦_£¥���I����£¥«LLR

£¥�I�¥�k¢É¯·¾GÃs�,�I¡C¾�³W���0©¥�¨«¥�d¡A£¥��¬r�%��£¶�¨�W«¥¢½­�_¡

CLobss

Ç ¢d�(�0�d¡C�.�%©¥���_�¨´I¦W�<Ê.�_�¨¡.¢(���Y�I�~�5Ú�¢(�Û´7�I¢d�W«¥�Õ£¥��¢��Û�W�%«¥��«¥���χd

�_�%���¨�W���,�%�¥£�Ƣɯ·�%©¥���_�¨´7�7¡��(�%�º È �%�0�~�§£¥�d¡3�¥��¦_�W¦W£��W�0�~�_�G¡W­¢��~£¥¦_¡��W���0�(�¥�7¡C�d�%�¿£¥��¢(�.¢(�d�~�]¡C�A���ª¬��I�]¡4�Y´%�_�¢É¯·�(�0�¥¢(¦_�~�_�G¡C�7¡C�d�%�¤£��N¢(�4�~¦'¡C¾¥�s£¥�

CLs

ÁG«¥���¨�N¡����%«�´I�M£��I�¥� ÈLÎ � ��ÐgÑLº È �M£¥�W�¨�¥�(�_�i�W�I¢(�_«¥¢(�¢��.¢d�(�0�d¡C�k��«��/¦_���(�_«¥�����¨«¥�4¢��~���W�'¡C�d�%�Û��Ý0�Y�I�_�Õ£¥���¥���s£¥«¥�'¡C�d�%�µ£¥«Û©/�I���%�µ£¥� ç �(¹%¹%�5Æ Ò Ý ïÈ �n­��7¯°�_�¨¡ÂÆÕ£¥�(�¨�4¢��ª¢(�d�~�]¡C�NÁG«¥���W�%�¨���W�¨�/�I�¥£�Æ

CLs ≤ Ý ï º

���0���d¹%���I¢s�_�¨¡ª�¨�W¢d�(¦ÕÆ�¢(�c�¨�W�'¡C�(�I� ��Ý0�W�I�W�~£¥�~�����s£¥«¥�_¡��(�%�Û¡C¾�¦W�%�¨�(ÁG«¥�

σSM

­ Æc¢���¢(«[Ï�~�d�¥�%���]¡C¦

L�'¡AÆ����%�Û�7�W�W�_��¡#�7�¥�W�

εs

���I�&às = R . σSM . L . εs

­/�5ÚR�_�¨¡A«¥�¿¬��7�_¡C�_«¥�Wº

Ö®�%«¥�4£�¦_¡C�_���0�(�¥�_�3¢���¢d�(�0�d¡��¤Æ Ò Ý ï È �p­R�W�¨¡§�I«�¹%�~�_�K¡C¦Âܨ«¥�¨ÁG«¯ÞÆ��_�0ÁG«¥�

CLs

£¥�(�0�(�G«¥��_¡5�7¡�¡��W�(¹I�¥�ªÝ ï º

R�_�¨¡3�I¢(�%�¨�M¢��Õ¢(�(�0�d¡��3��«��/¦_���(�_«¥�¨�ªÆ Ò Ý ï È � Ç �¥�I¡�¦

R95

ÊL£¥�§¢��Õ���W�'¡C�d�%���Ý0�Y�I�_�§�_��«��¥�d¡�¦4£¥�A¢��ª���_�_¡��(�%�c��Ý0�Y�7�W�k£¥« Ù ò¶º

Ä +w-�+�Y ¥c;0GI;�9JAÒ<ÍÊB9JA3�NBAÑá¡C�I�K¡M£¥�%�¥�¥¦AÁG«¯°�I«¥�_«¥���$²[�W³W�M£¥�4£��%�¥�¥¦_�W�N�W�%�0���7¡��(©¥¢d�5�Y´%�_�A¢��ª�¥�¨¦W���_�¥�W�k£¯·«¥�����d¹%���I¢

£¥« ç �d¹%¹%�i�¯Þ�ª¦'¡C¦3�I©¥���_�¨´%¦A£��7�¥��¢��A´7�I���(�I©¥¢(�N£¥�3�¨�%�¨¡��(�£¥«�ëÂì¶�/�%«��v¢(�_��£¥�_«[²�¢d�I¡C� Ë ú õ �'¡Ó �p­/�_�W�3£¥�_���¥�d�W�¨�3�%�K¡3�¨�W�¨´s�á£��¤´7�I���(�I©¥¢(�A£¯·�W�K¡���¦W��£¥�I�¥� ÈLÎ ����ÐgÑM­/�/�I«¥�5¦'¡#�I©¥¢d�(�M¢��~¢(�(�0�d¡����«¥�,¦W�¨�(�W«����¤�¨«¥�N¢��Õ���W�'¡C�d�%���+Ý~�W�I�W�¤£¥�¤�¥�¨�[£�«¥�_¡��(�%�c£¥« ç �(¹%¹%�_­�£��I�¥�¢ɯ·«¥�¥�]¡C¦A£¥�k¢��Õ���W�'¡C�d�%���Ý0�Y�I�_�4£¥�4�¥�¨�[£¥«��_¡C�d�%��£¥« Ù ò¶º��5�_�L¢(�(�0�d¡��W�n�%�K¡L¦'¡C¦4�Y�7¢(�W«�¢(¦W�_���,�%«¥�v¢(�¤�W�I�ª©¥�(�¥�I�(�¨�%�.£¥�_�ëN«¥���3Ð�Ðg�.�'¡3ШÐE©­}�,�%«¥�¢(�W� Ë%Ë �~�I���¨�W�3£�« ç �(¹I¹%�Â�_�%�0�¥���d���W�Â�W�K¡C�¨� Ë<Ô%Ô.ý � ú �_¡ Ë Ý Ô�ý � ú���I�5�¥�I�3£¥�ÕÝ ý � ú ­,�,�%«¥�3¢d�W�3�7���I¢dÃs�¨�W� eeicr �'¡ ee

���_«¥¢(�_�3�_¡3�W�%�ª©��(�¥¦_�W�W­}�I�(����� Ás«����/�%«��¢(�W�LÁG«��1¡C���k�I�¥�I¢dÃs���_�

eeicr ­ ee ­ µµ�'¡

µµtrace �_�%�ª©¥�d�¥¦W�_�Wº

���Û¡#�I©�¢(�Y�7« Ì º°çÀ�0�%�K¡C�¨�Û¢(�W�c¢(�d�~�]¡C�_���7¡�¡��W�¥£�«¥�W���_¡��%©¥���_�¨´I¦W�W���/�%«���¢d�W��£¥���/¦W�¨�W�K¡C�_��.�I�¨���_��£¥« ç �d¹%¹%�_­[�,�%«¥�w£¥���/¦W�¨�W�K¡C�_�L�W�%�ª©��(���I�d���%���w£¥�_�LÁG«��7¡C�¨�4�I���7¢dÃs���_�Wº¥���_��Þ�¹%«¥�¨�W� Ì º Ó ­

ËWØKÒ

Page 151: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

eeicr ee eeicr, ee eeicr, ee, µµ, µµtrace

MHý � ú Ѽ²[� ì Ù ò Î ©¥� ì Ù ò Ѽ²[� ì Ù ò Î ©¥� ì Ù ò Ѽ²[� ì Ù ò Î ©�� ì Ù ò Ѽ²[� ì Ù ò Î ©�� ì Ù ò

Ë<Ô%Ô Ó%Ó ºÞè%Ý ÓsË º ËIË Ò º Ë<Ì ç�º Ì è Ì º Ë è ç�º Ô Ý Ýsº ×%Ô Ó º Ò%ÒË<Ô Ý Ó ç�ºÞÝ Ó Ó1Ø º Ì%Ó Ë<Ô º Ô è Ì ºÞÝ Ì Ò º Ô%Ò è[º × ç Ýsº ÒKÓ × ºÞÝ ÓË%Ë<Ô ÓIÒ ºÞÝ%Ý Ó[Ë Ý Ë Ë<Ô º Ì%Ò Ò º Ô%Ì Ò º Ì Ý è[º × ç ç[º Ø%Ø × º Ì èË%Ë Ý × Ý[º Ø è Ó è[º Ë è ËUÓ ºÞÝ Ø Ë<Ô º Ô%Ì Ë%Ë ºóÝ Ô Ì º Ó%Ó èsºóÝ Ó Ø º Ì%×ËUÓIÔ ×%Ò º Ì è Ó7Ì º Ô%Ó ËYØ º Ò è Ë è[º Ô è Ë<× º ×%Ô ËUÓ º°ç%ç Ì ºóè Ë Ì º°çKÝËUÓ Ý ØKÒ º Ô ç ×I× º Ò Ý Ë è[º Ë<Ô ËYØ º ×%Ò Ë ÝsºÞç Ô Ë%Ë º ×IØ Ë<Ô º Ó7Ø Ì º Ô%×Ë<×%Ô ç Ë º ÌIØ Ø%Ò ºóÝ Ô Ó%Ó º°ç Ó ÓIÔ º × Ý ÓIÔ ºóÝ Ô Ë Ý[ºÞÝ Ì Ë<× º Ô%Ì Ë%Ë º Ô%×Ë<× Ý Ì ç�º Ó è Ý Ì º Ø è ÓIÌ º Ó[Ë Ó7Ø º Ë ç Ó Ýsº Ì è Ë<Ì º ÓIÌ Ë ç[º Ò%Ì Ë ç�º Ø%ØËYØKÔ Ë%ËYØ º Ø è è Ò º ÓIÓ ØKÔ º Ò%× Ó ç�º ÓI× × ç[º ×KÓ ÓIÔ º Ó è ÓI× ºóè Ô Ë<Ì º ÒIØËYØ Ý Ë ç Ë º Ë ç Ë Ý Ë º ÓIÒ Ý Ì ºÞÝ Ó Ø¥Ë º Ì�Ë Ý × º Ô è × è[ºÞè × ×%× º Ì ç × Ý[ºÞè ÌË Ý Ô Ó è Ô º ÌIØ Ó Ý%è[ºÞè Ò Ì%Ì º Ò%Ô ç Ò ºÞè%Ý Ì�Ë ºÞçKÝ Ý Ò º Ì%Ì Ý × º Ó[Ë ØKÌ º Ì ç#%$'&)( Ì º°ç � ���d�~�]¡C�A�%©¥�¨�W�u´%¦W� ǽΠ©¥�#ÊM�_¡4�1¡�¡C�_�¥£¥«¥� Ç Ñ¼²[��ÊÂ�W�µ«��¥�d¡�¦§£¥�¤¢��~�¨�W�'¡C�(�I�¿��Ý0�Y�7�W�£¥« Ù ò¶­��W�í¬r�%�¥�_¡��(�%�Û£¥�Õ¢(���~�I�¨���0£¥« ç �(¹%¹I�W­�£��I���§¢d�W�k�I���I¢]Ãs���W�A�¨¦W���I�¨¦W�_� Ç eeicr �'¡ ee

Ê$­£��I�¥�k¢(�_�A£¥�W«[² �I�¥�I¢dÃs���_�§�_�%�ª©¥�d�¥¦W�_� Ç

eeicr, eeÊA�'¡k�/�%«��§¢d�W�AÁG«��7¡C�¨�.�7���I¢dÃs�¨�W�k�W�%�ª©��(�¥¦_�W�

Çeeicr, ee, µµ, µµtrace Ê'º����W�ÂëM«¥�¥�MÐ�Ðg���_¡NШÐE©��%�K¡M¦'¡C¦k�W�%�ª©��(�¥¦_�L�/�%«��L�#¾��IÁG«¥�k�Y�I���7¢Éº

Ì º × ­ Ì º Ø ­K�_¡ Ì ºÞÝk�0�%�K¡C���_�K¡w¢(�k�_�%«¥�¨©/�N£¥�R95

�W�0¬r�%�¥�'¡C�(�I�~£¥�N¢��A�~�I���¨�£¥« ç �d¹%¹%�i�I�(������ÁG«¥�¢���£¥�d�¨¡C�¨�(©¥«[¡C�(�I�µ£¥�W�LLR

�I���¨�[�_�(¦W�_�¤�7«[²Û£¥�*�}¦_���W�K¡��W�¤¾KÃs�,�I¡C¾¥³_���_�W­¼�¨�W�¨�/�_�_¡C�]´%�_�~�_�G¡§�,�%«¥�¢(�_�¼�I�¥�I¢dÃs���_�

eeicr �_¡ ee��¦W�¥�I��¦_�W�á�'¡á�W�I�ª©¥�(��¦W�W�_­7�'¡á�_�[Þ��ª�,�%«¥�®¢(�W� ÁG«��7¡����L�I�¥�I¢dÃs���_�¼�_�%�ª©¥�mÏ

�¥¦W�_� Ç �_¬gº Ì º Ë �'¡ Ì º × º Ë Ê'º%»Â«¥�W«¥���N�d�K¡C�W�¨�/�I¢��7¡��(�%�§�¯°�_�¨¡i�l�/�W�'¡C«¥¦_�M�W�K¡C�¨�N�_�W�n�,�%�(�K¡C�¼£¥�M�.�I�¨���7­�_¡¼¢(�W�¼�/�%�d�K¡C�¼�,�%«¥�¼¢(�W�¨ÁG«¥�W¢d�á¢��N¢(�(�0�d¡��p�W�u¡n�Y�I¢d�W«¥¢d¦W�v�¨�%�K¡p���d�~��¢(�W�0�W�K¡®���_¢(�(¦_�¼���7�á«¥�¥��£����%�]¡C�Iº

ÕVù�� õ��y��¹% ��;ýl�y�È �§�#¾��7�¥�d¡����k��£¥¦W�_���d¡N¢(�Õ�0¦_¡�¾¥�s£¥�A«�¡C�d¢(�(�¨¦W�3�,�%«¥�M¦'¡#�I©¥¢d�(��¢(��¢(�(�0�d¡��5�¨«¥�M¢������_�_¡C�d�%�c��Ý�Ï

�Y�I�_�4£¥�3�¥�¨�[£�«¥�_¡��(�%��£¥«�©,�%�¨�%��£¥� ç �d¹%¹%�_­¥�I�d�¥���/Ás«}¯°«¥���4�~¦'¡C¾¥�s£¥�3�,�W�¨�~�'¡�¡#�7�G¡�£¥�4��¦_£¥«¥�(�¨�¢É¯·�(�0���I�'¡L£¥�W�Â�W�¨���W«����5�uÃs�¨¡C¦_�.�1¡C�(ÁG«¥�_�5�¨«¥�¢(�0¢d�(�0�d¡��Iº¥���_�Â�_�����_«¥���Â�¨Ãs�¨¡�¦W�~�7¡C�dÁG«¥�W�«�¡C�d¢(�(�¨¦W�_��%�K¡p¦_¡�¦L¦W�G«¥�0¦W�¨¦W�W�_­G�_¡n�W�lÞ��Õ¢��3¢(�d�~�]¡C�n��«��p¢��5�¨�W�_¡��(�%�Õ�+Ý~�W�I�W�M£¥�L�����s£¥«¥�_¡��(�%��£�«0©,�%�¨�%�Õ£¥�ç �d¹%¹%�W­7�/�I«¥�p«¥�¥�M¹K�I�0�0��£¥�L�~�I���¨�N�_�%�0�¥���d�����_�G¡���� Ë<Ô%ÔAý � ú �_¡ Ë Ý ÔAý � ú �4¦_¡�¦N�0�%�K¡C�¨¦W�7ºÖ®�%«��3«¥� ç �d¹%¹%�3£�� Ë%Ë Ý ý � ú ­,¢��.¢d�(�0�d¡��k�I©¥���_�¨´%¦_� Ç ���_���º�7¡�¡��W�¥£¥«��<Ê5�,�%«¥�3¢½¯Þ�I�¥�I¢dÃs��� eeicr�W�u¡5£¥�

Robs95 Õ Ó è[º Ë è Ç ���_���º

Rexp95 Õ × Ý[º Ø è%Ê'­��,�%«¥�N¢É¯°�I���I¢]Ãs���

ee�W¢d¢(�A�W�u¡3£¥�

Robs95 Õ Ë<Ô º Ô%Ì

Ç �¨�W���}ºRexp

95 Õ ËUÓ ºÞÝ Ø Ê$º�Ö®�%«¥�A¢(���_�%�ª©¥�d���I�d���%�µ£¥�0�W�_�§£��W«[²¶�I�¥�I¢dÃs���_�A�W¢(¢d���W�u¡¤£¥�Robs

95 ÕÌ º Ó%Ó Ç ���_���ºRexp

95 Õ ËIË ºóÝ Ô Ê'­��_¡5�W�[Þ¥�¿�/�I«¥�¢(�0�_�%�ª©¥�d���I�d���%�c£¥�W�ÂÁG«��7¡C�¨�ª�I�¥�I¢dÃs���_�5�_¢(¢(�A�_�¨¡£¥�

Robs95 Õ Ø º Ì%× Ç ���_���º

Rexp95 Õ èsºóÝ Ó Ê'ºs�p¯Þ�I�¥�I¢dÃs���

eeicr �¨�W«¥¢d�5�,�W�¨�~�'¡�«¥�¥�5�I�0¦W¢(�d�%�C�1¡C�(�I��£¥��¥��³_�M£¥� Ò ï ��«��N¢(�ª¢(�d�~�]¡C�Â�7¡�¡��W�¥£¥«��§¦'¡#�I©¥¢d�(�3£¥�I�¥�M¢(�4�W�I���I¢ee

���_«¥¢Éº

Ë Ý Ô

Page 152: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

)2 (GeV/cHm100 105 110 115 120 125 130 135 140 145 150

LLR

-1

-0.8

-0.6

-0.4

-0.2

-0

0.2

0.4

0.6

0.8

1

´*µ�¶þsþsÿeeicr

)2 (GeV/cHm100 105 110 115 120 125 130 135 140 145 150

)bb→

BR(H

×ZH

)→p

(pσLi

mit

/

0

20

40

60

80

100

b ll b→ZH

Observed LimitExpected Limit

´b·k¶þ������ ñeeicr

ã% u¡¢( Ì º Ó � ���(�0�d¡��§�¨«¥�4¢��~���W�'¡C�d�%�µ��Ý0�Y�7�W�Õ£¥���¥�¨�[£¥«��_¡C�d�%�µ£¥«Û�¥�¨�[�_�W���¨«¥� ZH → l+l−bb£��I�¥�¢ɯ°�I���I¢]Ã[�¨�eeicr º Ì º Ó Ç �KÊM£��(�¨¡����d©¥«�¡C�d�%�c£¥«µ����ë �_��¬r�%�¥�'¡C�(�I��£¥�ª¢(�~�~�I���¨�¤£¥« ç �(¹I¹%�ªà

¢���¢(�d¹%�¥�Õ�¥�%�d���Õ�¥¢(�_�(�¥�Õ�¨�W�¥�¨¦W���_�K¡C��¢(��´7�I¢d�W«¥�A£¥«ß� ��ë��%©����W�u´%¦7­¼¢���¢d�(¹%�¥�Õ�¨�%«¥¹%�Õ�,�%�(�K¡C�d¢(¢d¦W�¢���´7�I¢d�W«¥�§£¥«â� ��ë �7¡�¡��W�¥£¥«à£¥�I�¥��¢É¯·¾KÃs�/�I¡�¾¥³W�¨�����d¹%���I¢�� ©¥�¨«¥�d¡¤£¥��¬r�%�¥£}­¼¢���¢(�(¹I�¥�.�¥�I�(����/�%�d�K¡C�(¢d¢(¦_�¤¢���´7�I¢(�_«¥�A£¥«ß����ë �7¡¨¡C�W��£¥« £��7�¥�§¢½¯°¾KÃs�,�I¡C¾¥³_���0©¥��«��d¡k£¥�Õ¬r�%�¥£ �¨�W«¥¢½­�¢���©��I�¥£��´%�W�u¡C� Ç ¬r�I�¥�W¦_�<ʤ�_¡NÜ��I«¥�¥� Ç �W¢��7�(���YÊk�¨�W�¥�¨¦W���_�K¡C�W�K¡~���_���,�W�_¡��d´I�W�0�W�K¡0¢É¯·�(�K¡C�_�¨´7�I¢(¢d�.Æ Ë �'¡ Ó

σ�I«�¡C�I«¥�Õ£¥��¢(�¿´I�7¢(�W«��0�0¦W£����I�¥��£¥«ä��� ë £¥�I�¥�0¢É¯·¾GÃs�,�I¡C¾�³W����©¥��«��d¡0£¥��¬r�%�¥£â���W«�¢Éº Ì º Ó Ç ©�Ê���W����¦W�¨�W�K¡C�µ¢d�c¬��7�_¡C�_«¥�

R95

�W��¬r�%�¥�'¡C�d�%�䣥��¢��í�.�I�¨����£¥« ç �d¹%¹%�W­n¢(�¶¢(�d¹%�¥���¥¢d�W�(�����¥�I�(���Ç ���_���º��_���,�%�d�G¡��(¢d¢(¦W�Â���%«�¹%�<Êv�¨�W�¥�¨¦W���_�K¡C�¤¢(�ª¢(�d�~�]¡C�5�I©¥���_�¨´%¦_� Ç ���_���º,�7¡¨¡C�W��£¥«¥�<Ê$º

Ë Ý Ë

Page 153: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

)2 (GeV/cHm100 105 110 115 120 125 130 135 140 145 150

LLR

-1

-0.5

0

0.5

1

´*µl¶þ[þsÿee

)2 (GeV/cHm100 105 110 115 120 125 130 135 140 145 150

)bb→

BR(H

×ZH

)→p

(pσLi

mit

/

0

20

40

60

80

100

b ll b→ZH

Observed LimitExpected Limit

´b·k¶þ������ ñ.íee

ã% u¡¢( Ì º × � ���d�~�]¡C�k��«¥�4¢(�����_�_¡C�d�%�µ��Ý0�W�I�W�Õ£¥���¥�¨�[£�«¥�_¡��(�%�µ£¥«Û�¥�¨�[�_�W�¨��«¥� ZH → l+l−bb£��I�¥��¢½¯Þ�7���I¢dÃs�¨�eeº Ì º × Ç �%ʧ£¥�(�u¡C�¨�(©¥«�¡��(�%�¶£¥«â��� ë �W�à¬r�%�¥�'¡C�d�%�ࣥ��¢����.�I�¨����£¥« ç �(¹%¹%�Và

¢���¢(�d¹%�¥���¥�I�(���Õ�¥¢d�W�d�¥�Õ���W����¦W�¨�W�K¡C��¢(��´I�7¢(�W«��k£�«ß����ë��I©¥���_�¨´%¦7­®¢(�c¢d�(¹%�������%«¥¹I�~�,�%�(�K¡��(¢(¢d¦W�¢���´7�I¢d�W«¥�§£¥«â��� ë �7¡¨¡C�W��£¥«�£��I�¥��¢½¯°¾KÃs�/�7¡C¾¥³_�������d¹%���I¢�� ©���«¥�]¡ª£¥��¬r�%��£­¼¢(��¢(�d¹%�¥�.���%�(�¨��/�I�(�K¡C�d¢(¢(¦_�¤¢(��´7�I¢d�W«¥�4£¥« ��� ë �1¡�¡C�_�¥£¥«¶£��I�¥�§¢É¯·¾GÃs�,�I¡C¾�³W���0©¥�¨«¥�d¡k£¥�Õ¬r�%�¥£í���_«¥¢É­�¢���©��I��£¥�´%�_�¨¡C� Ç ¬r�%�¥�_¦W�<ʤ�'¡5Ü��I«¥�¥� Ç �W¢(�I�(�¨�<Êk�¨�W�¥�¨¦W�¨�W�K¡C�_�G¡~���_���,�W�'¡C�d´I�W�0�W�K¡0¢É¯·�(�K¡C�_�¨´7�I¢d¢(�~Æ Ë �_¡ Ó

σ�I«�¡��%«¥�Õ£¥�c¢��¿´7�I¢(�_«¥�Õ�~¦_£¥���I���c£�«�����ë £��I�¥�0¢É¯·¾KÃ[�,�I¡�¾¥³W�¨��©¥�¨«¥�d¡0£¥��¬r�%�¥£À���_«¥¢Éº Ì º × Ç ©�Ê���_�¥��¦_���W�K¡��µ¢(��¬��I�_¡��W«¥�

R95

�W��¬r�%���_¡C�d�%�ä£���¢��í�.�7������£¥« ç �(¹%¹%�_­w¢(�í¢d�(¹%�����¥¢d�W�d�¥�����%�(�¨�Ç �¨�W���}º��W�c�/�%�d�K¡C�(¢d¢(¦_�5���I«¥¹%�<Êv�¨�W�¥�¨¦W�¨�W�K¡C�§¢��ª¢(�d�~�]¡C�Â�%©¥���_�¨´I¦W� Ç ���_���º,�7¡¨¡C�_�¥£¥«¥�YÊ'º

Ë Ý Ó

Page 154: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

)2 (GeV/cHm100 105 110 115 120 125 130 135 140 145 150

LLR

-1

-0.5

0

0.5

1

´�µl¶þsþ[ÿiÀ0ò��%·�����íee, eeicr

)2 (GeV/cHm100 105 110 115 120 125 130 135 140 145 150

)bb→

BR(H

×ZH

)→p

(pσLi

mit

/

0

20

40

60

80

100

b ll b→ZH

Observed LimitExpected Limit

´b·p¶þ���� ñ.í>À=ò��®·����Wíee, eeicr

ã% u¡¢( Ì º Ø � ���(�0�d¡��§�¨«¥�4¢��~���W�'¡C�d�%�µ��Ý0�Y�7�W�Õ£¥���¥�¨�[£¥«��_¡C�d�%�µ£¥«Û�¥�¨�[�_�W���¨«¥� ZH → l+l−bb£��I�¥��¢(�§�W�I���5Ú�¢d�W���7���I¢dÃs�¨�W�eeicr �'¡ ee

�%�K¡�¦'¡C¦4�_�%�ª©¥�d�¥¦W�_�Wº Ì º Ø Ç �KÊn£��(�¨¡����d©¥«�¡C�d�%�.£�«�� ��ë�W��¬r�%�¥�'¡C�(�I��£¥�4¢��ª�~�I���¨�4£¥« ç �d¹%¹%��ॢ(�¤¢(�d¹%�¥�3���%�(�¨�3�¥¢(�_�(�¥�5���W����¦W�¨�W�K¡C�k¢��k´I�7¢(�W«��L£¥«c� ��ë�%©¥���_�¨´I¦I­¢(�~¢(�d¹%�¥�A���I«¥¹%�¤�,�%�d�G¡��(¢d¢(¦W�A¢(�0´7�I¢(�_«¥�N£¥«Û��� ë��7¡¨¡C�_�¥£¥«µ£��I���3¢É¯·¾KÃ[�,�I¡�¾¥³W�¨�ª���d¹%���I¢� ©���«¥�]¡�£¥�3¬r�%��£­�¢(�§¢(�d¹%�¥�N�¥�%�d���3�,�%�(�K¡��(¢(¢d¦W�L¢(�§´7�I¢(�_«¥�v£¥«�����ë �1¡�¡C�_�¥£¥«�£��7�¥��¢É¯·¾KÃs�/�I¡�¾¥³W�¨�©¥��«¥�]¡¼£��v¬r�%�¥£ª�¨�W«¥¢½­7¢(�©��7�¥£¥�v´I�W�¨¡�� Ç ¬r�I�¥�W¦_�<Ê®�'¡/Ü��I«¥�¥� Ç �_¢��I�d���<Ê����_�¥��¦_���_�G¡��L���_���,�W�_¡��d´I�W�0�W�K¡¢É¯·�(�K¡C�_�¨´7�I¢(¢d�ªÆ Ë �_¡ Ó

σ�7«�¡C�%«��k£��0¢(�.´7�I¢(�_«¥�4�~¦_£¥���7�¥��£¥«¶� ��ë�£¥�I�¥�A¢É¯·¾KÃ[�,�I¡�¾¥³W�¨�~©¥�¨«¥�d¡

£¥�0¬r�I�¥£ �¨�W«¥¢½º Ì º Ø Ç ©�Ê3���W����¦W�¨�W�K¡C�_�K¡Õ¢(�Õ¬��I�_¡��W«¥�R95

�_� ¬r�%�¥�'¡C�(�I�¶£¥�0¢����~�I���¨�.£¥« ç �(¹I¹%�W­¢���¢(�d¹%�¥�Õ�¥¢(�_�(�¥�Õ�¥�I�(��� Ç ���W�¨�º �W� �,�%�d�G¡��(¢d¢(¦W�¤���%«¥¹I�<Ê4���W����¦W�¨�W�K¡C�.¢���¢(�(�0�d¡��¤�%©����W�u´%¦_� Ç �¨�W���}º�7¡�¡��W�¥£¥«��<Ê'º

Ë Ý ×

Page 155: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

)2 (GeV/cHm100 105 110 115 120 125 130 135 140 145 150

LLR

-2

-1.5

-1

-0.5

0

0.5

1

1.5

´�µl¶}þsþ[ÿåÀ0ò��%·�����íee, eeicr, µµ, µµtrace

)2 (GeV/cHm100 105 110 115 120 125 130 135 140 145 150

)bb→

BR(H

×ZH

)→p

(pσLi

mit

/

0

10

20

30

40

50

60Observed LimitExpected Limit

´*·p¶þ�����ÐñdÀ0ò��®·����Wíee, eeicr, µµ, µµtrace

ã% u¡¢( Ì ºÞÝ � ���d�~�]¡C�k��«¥�4¢(�����_�_¡C�d�%�µ��Ý0�W�I�W�Õ£¥���¥�¨�[£�«¥�_¡��(�%�µ£¥«Û�¥�¨�[�_�W�¨��«¥� ZH → l+l−bb£��I�¥�¢��0�Y�I�3�fÚ¿¢(�_�5ÁG«��7¡������I�¥�I¢dÃs���_�eeicr ­ ee ­ µµ

�'¡µµtrack �I�G¡3¦_¡C¦§�W�%�¤©¥�(�¥¦_�W�_º Ì ºÞÝ Ç �%Ê£¥�(�u¡C�¨�(©¥«�¡��(�%�c£¥«µ����ë �W�¿¬r�%���_¡C�d�%��£��ª¢��Õ�.�7�����¤£¥« ç �d¹%¹%�­à/¢(�~¢d�(¹%�¥�A�¥�I�(���§�¥¢(�_�(�¥�k���_�¥��¦$Ï

���_�G¡��ª¢��Õ´7�I¢(�_«¥�5£¥«¿� ��ë��%©¥�¨�W�¨´I¦I­¢(�~¢d�(¹%�¥�k���I«¥¹%�¤�,�%�d�G¡��(¢d¢(¦W�4¢(�0´7�I¢d�W«¥�N£¥«Û����ë��7¡¨¡C�_�¥£¥«£��I�¥�4¢½¯°¾KÃs�,�I¡C¾¥³_���Õ���d¹%���I¢:� ©¥�¨«¥�d¡3£¥��¬r�%�¥£­¢(��¢(�d¹%�¥�¤���%�(�¨�ª�/�I�(�K¡C�d¢(¢(¦_�§¢(�.´7�I¢(�_«¥�3£¥«¶��� ë�7¡�¡��W�¥£�«~£��7�¥�n¢É¯·¾GÃs�,�I¡C¾�³W���N©¥�¨«¥�d¡n£¥�L¬r�%��£~�¨�W«¥¢½­K¢��4©��I�¥£��M´I�W�u¡C� Ç ¬r�%�¥�_¦W�YÊn�'¡�Ü��7«¥�¥� Ç �_¢��I�d���<Ê���_�¥��¦_���W�K¡��W�K¡ª�¨�W���,�W�'¡C�]´%�W�0�W�K¡§¢É¯·�(�K¡C�_�¨´7�I¢d¢(�ªÆ Ë �_¡ Ó

σ�7«�¡C�%«��4£¥�Õ¢���´7�I¢(�_«¥�4�~¦_£¥���7�¥��£¥«

��� ëâ£��I�¥�n¢½¯°¾KÃs�/�7¡C¾¥³_���M©¥��«��d¡p£¥�L¬r�%��£0�¨�W«¥¢½º Ì ºÞÝ Ç ©�ʼ���W����¦W�¨�W�K¡C�N¢(�w¬��I�_¡��W«¥�R95

�W��¬r�%�¥�'¡C�d�%�£¥��¢��~�.�I�¨����£¥« ç �(¹%¹%�_­}¢(�.¢(�d¹%�¥�¤��¢(�W�d�¥�ª�¥�I�(��� Ç ���_���º}�W�Û�/�I�(�K¡C�d¢(¢(¦_�§�¨�%«¥¹%�YÊÂ���_�¥��¦_���_�G¡��~¢(�¢(�d�~�]¡C�N�%©¥���_�¨´I¦W� Ç ���_���º��7¡¨¡C�_�¥£¥«¥�YÊ'º

Ë Ý Ø

Page 156: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

� ����� �

È �L�0¦W�0�%�d���i£¥¦W�_���d¡¼¢(�_�ᣥ���/¦W�¨�W�K¡C�®¡C�C�Y´7�I«[²��I«[²[ÁG«¥�W¢d�,Ü_¯°�I�����7�¨¡C�d�W�d�/¦_�¼£¥«¥���I�K¡p�~�¡C¾¥³_���7ºÈ �_¡�¡��§£��W�����(³W�¨�§�_¯°�_�¨¡5£¥¦W�¨�%«¥¢(¦_�§�¨«¥�d´7�I�K¡N£¥�_«[²�¹%�C�I��£¥�W�N¦_¡C�I�/�_�Wº��¤¯°�I©/�I��£ªÜ_¯Þ�I���V�}�_�_¡�«¥¦¤£¥�_�¡C�C�Y´7�I«[²�£¯·�(�K¡C¦_���_¡�¹%¦W�¥¦_�C�I¢}��«¥�L¢d�3�Y�I¢d�%���d�~³'¡C�¨�I­G�¥«¥�d� Ü_¯Þ�7�}���I�u¡C�d�W�(�,¦3ƪ¢(�ª���_�#¾¥�W�¨�#¾¥�§£�«�©/�7Ï���%�c£¥���Â�d¹%¹%�L�I« õ �_´7�7¡C�¨�%�º�ið���������� ñ<ïUð��µ���(�K¡����s£¥«¥�d¡A¢d�~�0�s£¥³W¢d�0�u¡#�I��£��I��£¶£¥�.¢(�c��¾GÃs�¨�(ÁG«¥�.£��W�¤�¥�I�¨¡��(�W«�¢(�W�k�_¡§¢(��~¦_�Y�I�¥�d���0�ª£¥���Â�d¹%¹%�_º Î �í��´s«í¢����_�%¾¥¦W�¨�W�¥�_�~�_�K¡C���Õ¢d� Ù ò2�_¡k¢(�_�4�%©¥���_�¨´7�7¡��(�%�¥�4�$²[�/¦_���]Ï�~�_�G¡C�I¢(�_�W­[�_¡N¢É¯·�(�0�/�I�¨¡#�7�¥�W�N£¥�A¢��¤�¨�W�#¾¥�_���#¾¥�§£¥«�©/�I���%�¥�L£����N�(¹%¹I��£��I�¥�L�_�A�~�s£¥³W¢d�Iº[ÐE¢�W�u¡¢��A�W¢(¦N�~�I�¥ÁG«��I�K¡C�ÂƧ�_�5£¥�_���¥�d�W�i�Y�I�i�(¢��,�W�¨�~�'¡�¡��C�I�]¡w£}¯°�$²���¢(�(ÁG«¥�_�w¢½¯°�I���(¹I�(�¥��£��5¢��A�~�I���¨�£¥�_����I�¨¡��(�_«¥¢(�_�Wº�ið ���!���"� ñ<ïUð #í���¥��¦_���W�K¡�¦~¢d���W�%�0�¥¢(�$²[��£¯Þ�7�W�W¦_¢(¦_�C�7¡��(�%�µ£¥« õ �_´7�7¡C�¨�%�Û�_¡A£¥«í£¥¦'¡C�W�'¡C�_«¥�����Æ~ì��_���0�(¢��7©º����_�5£¥�*�}¦_���W�K¡��W�N¦_¡#�7�/�_�5�I¢d¢��I�K¡M£¥�k¢��ª¬��I©����(�W�7¡C�d�%��£¥�_�¬��I�d���W�W�I«[²��,�%«¥�N¢���W�%¢d¢(�(�¨�(�%�}­#ܨ«¥�¨ÁG«¯ÞƧ¢��A���W�_�%�¥�u¡C��«��_¡C�d�%�.£��W�i¦_´%³_�¥�W�0�W�K¡��MƧ�I�¥�I¢dÃs���_�W­G�W�~���I�¨�C�I�K¡��¥�I�n¢��A£¥�W�gÏ�W���d��¡C�d�%�.£��W�L£¥�*�}¦_���W�K¡��W�����7�¨¡C�d�W��£�«�£¥¦_¡��W�_¡��W«¥�_­¥�%�K¡L¦'¡C¦3£¥¦_�W�¨�d¡C�_�Wº%$N�%«¥�L�Y´I�%�¥�L¦W¹%�I¢(�_�~�_�G¡´[«c¢(�_�L�~�<ÃI�W�¥�N�~�d���W��ãA«�´s���k�/�I«¥�L¢��ª�¨�W�#¾¥�_���#¾¥�§£¥«�©,�%�¨�%��£����N�(¹%¹I�Wº�ið&��������� ñ<ïUð('µ�~�(�K¡����s£¥«¥�d¡M¢d�W�N�%©sܨ�'¡C�3�¥¾KÃs���dÁG«¥�W�3ÁG«¥� �%�K¡3¦'¡C¦k«�¡C�d¢(�d��¦W�L¡��%«�¡4�7«�¢(�I�¥¹~£���W�_¡¨¡C�5¡�¾¥³W�¨�Iº����_���%©sܨ�'¡C�L¦W¢d�W�'¡C���I�.�I¹I�¥¦_¡��(ÁG«¥�W�w�_¡L¢d�W��ܨ�_¡C�_­�£¥¦'¡C�_���0�(���I�K¡v£��I�¥��¢(�¤���_�#¾¥�W�¨�#¾¥�£¥«�©,�%�¨�%��£¥���Â�(¹I¹%�L£¥�A�W�'¡�¡C�4¡�¾¥³W�¨�I­��%�K¡M¬��I�d¡L¢½¯°�I©sܨ�_¡M£¯·«¥�¥�§�7¡¨¡C�W�K¡��(�%�����I�u¡C�d�W«¥¢d�(³W�¨�Iº�ið)�*�!�����rñYï1ð(+À�.��¦_��«¥�0¦ª�0�%�¿�¥�¨�W�0�(�_�N¡��C�Y´7�I�(¢ £¯·�(�K¡C¦_���_¡3¹%¦W�¥¦_�C�I¢½º ö ¯°�I��¬��I�d¡Â«¥�¥�¤¦_¡C«�£¥���«¥�®¢É¯·¦W�¥�_��¹%�d�v�0�W��«���¦W�v£��I�¥�®¢(�v�W�I¢(�I���(�0³_¡����7­<�_¡,Ü_¯°�I�s£¥¦_¡��W�¨�~�d�¥¦w£��W�¼¬��I�'¡C�_«¥���á£����W�%�¨���_�_¡C�d�%�º�n¯·¦_¡�«¥£¥�L�3�0�%�K¡C�¨¦W��ÁG«¥�v¢(�W�®¬��I�_¡��W«¥�¨�ᣥ�L�W�I�����_�_¡��(�%�ª�¨�%�K¡á¬��I�d©¥¢(�_�¼�_¡á�¨¡#�7©¥¢(�_�á£��I�¥�¼¢(�w¡��W�0�¥�WºÈ �_¡�¡����I�¥�I¢dÃs���.�c¬��I�]¡k¢É¯·�%©sܨ�_¡§£¯·«¥�¥�����I¡C�0�(�K¡C�_���¥� S Ý Ò U £¥�%�K¡Nܨ�~��«¥�d�¤«¥�¶£¥�W�ª�����(���W�(�¥�I«[²�I«�¡C�_«¥���_º�ið,���!���"� ñ<ïUð.-â�¿�¨¦W��«��~¦��0�%�ࣥ�_«[²[�(³W�0�.¡��C�Y´7�I�(¢i£¯·�(�K¡C¦_���_¡Õ¹I¦W�¥¦_�C�I¢½º ö ¯°�I�v���7�¨¡C�d�W�d�/¦.Æ¢��¿�W�_�¨¡��0/��W�7¡C�d�%�ࣥ��¢É¯·�(£¥�_�K¡C�0/¥�Y�7¡��(�%�ߣ��W�0¦W¢(�_�_¡����%�¥�Õ£��7�¥�Õ¢(���W�I¢(�%�¨�(�0³_¡����Iº È �_¡¨¡C��¦_¡�«¥£¥����/�_���0�(�v£��4£¥¦_¡��W���0�(���W��£¥�_�L�W�%«��¥«¥���_�N�I�¥�¥�¨�%�¥���d¦W�_�L�/�%«����(£¥�_�K¡C�0/¥�W��¢d�W��¦_¢(�W�'¡C�¨�%�¥�L£��I����¢(�_�£¥���/¦W�¨�W�K¡C�_�0�¨¦W¹%�d�%�¥��£¥«â�Y�7¢(�%�¨�(�0³_¡C�¨��Ƶ¾��I«[¡C��¢(«¥�0�(���%���]¡C¦Iº È �_¡¨¡C�c�I���7¢dÃs���c�¿¬��I�d¡ª¢É¯·�%©sܨ�_¡£¯°«��¥�A�¥�I¡C�A�d�G¡��W�¨�¥� S ç%ç U £¥�%�K¡áܨ�A��«¥�d�L«¥��£��W�N�¥���d�¥�W�d���I«[²��I«�¡C�_«¥���_º�ið1�*�!�����rñ<ïUð12c£¥¦_�W�¨�d¡M¢É¯·¦_¡�«¥£¥�4ÁG«¥�vÜ_¯°�I�}¬��I�]¡C�3�,�%«¥�L£¥¦'¡C�_���0�(�¥�_��¢(�_�L��30�Y�I�_�d¡�¦W�M£¯·�(£¥�_�G¡��0/�Ï�Y�7¡��(�%�ª£��W�p¦W¢d�W�'¡C���I�¥�p�I�d�¥���[Ás«��L£¥�W�á¬��I�'¡C�_«¥���p£¥�L�_�%���¨�W�'¡C�(�I�­7£¥�I�¥�p¢��Â��¦W¹I�(�%�ª�d�K¡C�W�gÏE�_�¨Ã%�I�¨¡#�1¡£¥«§�W�I¢(�I���(�0³_¡����7º ö ¯°�I�K�0�%�K¡C��¦pÁG«¥�i¢(�_���W�%«��¥«¥���_�®�¨�/¦_�W�4/�ÁG«¥�W� «�¡C�d¢(�d��¦W�_���/�_���0�_¡¨¡#�I�d�W�K¡�£¯°�<´I�%�(�«¥�¥�5�$²[�W�W¢d¢(�_�G¡��5��3~�W�I�W�]¡C¦N£¥�5£�¦_¡C�_�_¡��(�%�~�_¡�ÁG«¥�¢(�_�i¬��I�'¡C�_«¥���w£¥�5�_�%���¨�W�_¡��(�%�~¦_¡C�I�(�_�G¡i¬��I�d©¥¢(�_�WºÈ �_¡�¡��3¦_¡�«¥£¥�4�§¦W¹K�I¢d�W�0�W�K¡v¬��7�d¡i¢É¯·�%©sܨ�'¡�£¯·«¥�¥�4�¥�7¡C�5�d�K¡C�W�¨�¥� S·Ì ç U £¥�%�K¡®Ü¨�Â��«¥�d��«¥��£��W�L�¥�¨�(�[Ï�W�(�¥�I«[²��7«�¡C�_«¥���_º�ið���������� ñ<ïUð.5Û£¥¦_¡C�I�(¢d¢(��¢½¯Þ�I�¥�I¢dÃs���Õ�¨«¥�§¢(�c�¨�W�#¾¥�_���#¾¥�.£¥«6�N�(¹%¹%�A�¥�¨�[£�«¥�d¡k�W� �I���¨�[�_���7¡��(�%��<´I�W�4«¥��©,�%�¨�%�

Z£��I�¥�v¢(�W�v£¥�%�¥�¥¦_�W�L£¥«�£¥¦'¡C�_�_¡C�_«¥����� �W�%�¨���_���,�%�¥£��I�K¡NƤ«��¥�4¢(«¥�0�(���%���]¡C¦

�(�K¡C¦_¹%��¦_��£¥� Ø º Ó ¬r© −1 º ö ¯Þ�I��¡��C�Y´7�I�(¢d¢(¦~£��I�¥�բɯ°�I���7¢dÃs��� ZH → e+e−bb­p�I«â�¥�d´I�Y�I«â£¥��¢��

�¥��¦$ÏE��¦_¢(�_�_¡C�d�%� £��W�¤¦_¢(�_�_¡C�¨�%�¥�§£��I�¥�§¢(�Õ�Y�I¢d�%���d�~³'¡C�¨�I­��_¡§�W� ���I�¨¡��(�_«¥¢(�d�W�4£��I���¤¢(�0�Y�7�¤�87¶«¥�£¥�W�N¦W¢d�W�_¡����%���N�¨�k¡����%«[´%�k£��I�¥�N¢�����¦_¹%�(�I�c�d�K¡C�W�gÏE�_�¨Ã%�I�¨¡#�1¡Yº È �_¡¨¡C�§�I���I¢]Ãs���k�0¦'¡C¦A��¦W�I¢(�d��¦_�k�_��W�%¢d¢��I©,�%�C�1¡C�(�I�~�Y´I�W�4¢É¯°�I���7¢dÃs���

ZH → µ+µ−bbº��5�3©,�%�¥���I�W�_�%��£¥�v�W�K¡C�¨�4¢(�W�w£¥�%�¥��¦W�W�L�'¡L¢��

���(�¤«¥¢��7¡��(�%�k�%�K¡p¦'¡C¦L�%©¥�¨�W�u´%¦W�n¢d�%���á£���¢��5����¦'Ïî��¦_¢(�W�'¡C�d�%�­I�'¡p�W�'¡�¡��L¦_¡#�7�/�7­I�W�¨«¥�W�(�I¢(�7­%�5�¨�W�u´[��£��©��I����Æ3¢��5�¨«¥�d¡���£¥��¢½¯Þ�I�¥�I¢dÃs���7º7»Â«¥�W«��0�$²[�W³W�n£¥�v£¥�%�¥�¥¦_�W�n�W�I�~���1¡C�(©�¢(�w�<´I�W�L¢d�v���d¹%���I¢[���_�#¾¥�W�gÏ�#¾¥¦ª�¯°�.¦_¡�¦¤�%©����W�u´%¦�£��7�¥�5¢½¯Þ�I�¥�I¢dÃs���k£¥�d���W�¨�(�0�(���7�G¡��9/����I¢d�I­,�_¡3£��W�3¢d�(�0�d¡C�_�L��«¥�5¢��Õ���W�'¡C�d�%���30�Y�I�_�3£¥�N�¥���s£¥«¥�'¡C�d�%�.£¥«.©/�%�¨�%�.£��:�Â�d¹%¹%�n��«��v¢É¯·�(�K¡��W�¨´7�I¢d¢(�L£¥�Â�.�7�����N�W�I�~�¥�¨�(�i�W�K¡C�¨� Ë<ÔIÔý � ú �'¡ Ë Ý ÔÕý � ú ­¥�I�G¡����I�L�W�I�¥��¦_Ás«��W�K¡5¦'¡C¦4¦'¡#�I©¥¢d�(�_���/�I«¥��¢(�_�L£¥���/¦W�¨�W�K¡C�L�W�I���I«s²}­��W�%�0�~�

Ë Ý%Ý

Page 157: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

£¥¦W�_���]¡M�I«;��������� ñ<ïUð1<º È �_�M�I���I¢]Ãs���W�L�I�G¡M�0�%�K¡C�¨¦W�_�LÁs«��4�/�%«���«¥�=�Â�d¹%¹%�v£�� Ë%Ë Ý ý � ú ­�¢(�¢(�d�~�]¡C�M�%©¥�¨�W�¨´I¦W� Ç �¨�W���}º��7¡�¡��W�¥£¥«��<Êv�,�%«¥�L¢É¯°�I���7¢dÃs���eeicr ���W«�¢(�4�W�u¡N£¥� Robs

95 > Ó è[º Ë è Ç �¨�W�¨�ºRexp

95 > × Ý[º Ø è%Ê'­¥�,�%«¥�L¢½¯Þ�7���I¢dÃs�¨�ee

�¨�W«¥¢d�4�W¢d¢(�4�W�u¡N£¥�Robs

95 > Ë<Ô º Ô%Ì Ç ���_���ºRexp

95 > ËUÓ ºÞÝ Ø Ê'­�/�I«¥�A�W�W�¤£¥�W«[² �I�¥�I¢dÃs���_�¤�_�%�ª©¥�d�¥¦W�_�§�_¢(¢(�Õ�_�¨¡ª£��

Robs95 > Ì º Ó%Ó Ç ���_���º

Rexp95 > Ë%Ë ºÞÝ Ô Ê'­��'¡

�W�?/¥�c�,�%«¥�v¢��ª�W�I�ª©¥�(�¥�I�(�¨�%��£¥�_�LÁs«¥�7¡C�¨�A�I���I¢]Ã[�¨�W�_­¥�W¢d¢(�3�_�¨¡M£¥�Robs

95 > Ø º Ì%× Ç ���W�¨�ºRexp

95 >è[ºÞÝ Ó Ê'º¥�n¯°�Uܨ�%«[¡M£¥�W�N¦W¢d�W�_¡����%���N£��k¢(�ª��¦_¹%�(�%���d�G¡��W�gÏE�W�uÃ%�%�u¡#�7¡Â�����I�M�_�%�¥��¦_ÁG«¥�W�K¡4�7�~¦_¢(�(�I��¦5¢(�¢(�d�~�]¡C�Â�7¡�¡��W�¥£¥«��k£¥�I�¥�M¢É¯°�I���I¢]Ãs���

ee£¥�A�¥��³_�£¥� ÒA@ º

È �W�ª�¨¦W�¨«¥¢d¡C�7¡C�§�%�K¡¤¬��I�]¡§¢½¯°�I©sܨ�_¡¤£¥�.�¥¢d«¥���d�W«¥�¨�¤�¥�7¡C�W�§�(�K¡C�_���¥�_� SmË%Ë<Ô U SmËUÓIÒ U S]ËY×%Ô U S]ËY×�Ë U º®ÐE¢d��%�K¡n¦_¡�¦N����¦W�¨�W�K¡C¦_��Æ4¢��3�_�%��¬r¦_���W���W�5ò��%���d�%�¥£��_� ÓIÔIÔ%Ò�S è%è U ­K�'¡n���%�K¡w�I�'¡C«¥�_¢(¢(�_�~�_�K¡n�W�Õ�W�%«����£¯°�I�¥�¥�¨�%©��7¡��(�%�����7�i¢(�4�W�%¢d¢��I©,�%�C�1¡C�(�I�&���±�,�%«¥�B�'¡C���M�¥«�©¥¢(�d¦W�n�I«3ܨ�%«¥�¨���I¢�Öp¾KÃ[�¨�(�W�I¢,ëN�'´[�d�l{���_¡�¡��W�¨�Wº

Ë ÝIç

Page 158: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

C û� �û��öýåù�ú¿ø²û6þ

S]Ë U åEÐE�K¡C���s£¥«¥�'¡C�d�%��¡C�0Ñp¢(�W�0�W�K¡C�I�¨Ã�Ö®�I�¨¡��(�_¢(�W�gæ°�¤º ý ���]¡C¾¥�_­ ö �%¾���!Ú�d¢(�_ÃED Ù �I�¥�W­ Ë<ÒIÌ è[ºSÞÓ U å ý �7«¥¹%� õ ¾¥�_�%���d�W�M�I¬ ¡C¾¥� Ù ¡����%�¥¹�­]! �W�IÍ�­��I�¥£cÑp¢(�W�'¡C�¨�%�.�7¹%�¥�_¡��(�3ÐE�K¡��W�C�7�_¡C�d�%�¥�gæ#­È ºGF3«¥�(¹I¹¥­J!¶�W�u¡¨Ïî´s�d�l{ Öp�¨�W���_­ Ë<Ò%Ì%× º

S°× U åH$Â�_«�¡C�¨�(�¥�Âò��I�¨���_�®�7�¥£ªòc�]²[�(�¥¹9IYÑp´s�d£¥�W�¥�_�i�I�¥£AÐE�~��¢(�(�W�7¡C�d�%�¥�gæ#­_ò È º ý �%��JY�7¢(�KJ$Ï ý �I���_���D­RªºL$Â�d�W­¥¾¥�_�[ÏE��¾LM ÔKÓIÔ%ÓIÔ Ý Ì ´ ÓÕÓ »Â«¥¹ ÓIÔ%ÔKÓ º

S·Ø U:NO�OAPQ�R�R8S*TUWVGXZYGX[P%S8\LX*]BU�^*_�`�RaVGXZYGX�R�bGX[TL]8_�ced8P�fLghA]8_ ºS Ý U åE»�ò��[£��W¢��I¬¼���W��¡��%�¥�uæC­ Ù º8!¶�W�d�s©,�W�¨¹¥­�Öp¾KÃ[�_º,ëN�'´/º����'¡�¡Yº ËYÒ ­ ËUÓ ç Ø Ï ËUÓ ç%ç Ç ËYÒ çKè%Ê$ºS ç U Ù º��nº ý ¢��7��¾¥�s{A­�Öp¾KÃs�Wº,ëN�'´,º � Ó ­ ËUÓIÌ Ý Ç Ë<Ò è Ô Ê'ºS è U å õ ¾¥�i�Â�(¹I¹%���«¥�K¡C�_�W¯·� ý «¥�d£¥�'æC­ Ù º0�3� {M���%�}­ ö º�ìvº ý «¥�¥�d�%�­!�kº�ÑMº��Â�I©/�_�W­ ý º!jA�I�¥�I­ì����%�K¡��(�W�¨�L�(��Öp¾KÃs���(�_�W­ ú �%¢(«��~� ÌIÔ º

S°Ì U Ö ºL�Â�d¹%¹%�W­¥Ön¾KÃs�Wº,ëM�_´,º,���_¡�¡Wº ËUÓ ­ ËY×KÓ Ç Ë<Ò ç Ø Ê'ºS°Ò U Ö ºL�Â�d¹%¹%�W­¥Ön¾KÃs�Wº,ëM�_´,º ËYØ Ý[­ Ë%Ë ÝIç Ç Ë<Ò ç%çKÊ$ºS]Ë<Ô U ëkº � �¨�%«�¡W­�ìvº�Ñp�¥¹%¢d�W�u¡Y­�Öp¾KÃ[�_º,ëN�'´/º����'¡�¡Yº ËY× ­ ×KÓ[Ë Ç Ë<Ò ç Ø Ê$ºS]Ë%Ë U ý «¥���I¢(���(Í�­��Â�I¹%�W���I�¥£=j4�(©�©¥¢(�AÖp¾KÃs�Wº°ëN�'´/º°���_¡¨¡C�W�¨� Ë<× Ç ËYÒ ç Ø Ê�Ý Ì ÝUÏuÝ Ì è[ºS]ËUÓ U $§º È �I©¥�d©¥©,�¥­��pºNò��I�(�I�¥�½­ ý ºLÖ¼�7���(�¨�4�I�¥£±ëAºLÖ®�'¡C���I��JW�d�¥­k$«��W¢Éº�Ön¾KÃs�Wº � Ë Ý Ì ­ ÓIÒ ÝÇ ËYÒ è Ò Ê$ºS]Ë<× U ý º¥»Â¢d¡C�I���_¢(¢(�/�I�¥£ ý º¥ÐE���d£¥�%���½­¥Öp¾KÃs�Wº/���'¡�¡Wº � ×I× è Ç Ë<Ò%Ò7Ø Ê ËYØ¥Ë ºS]ËYØ U õ º �5�I�ª©KÃI� �I��£ j�º ëM�(�_�����_¢(�~�I�¥�­ Öp¾GÃs�_º ëM�_´,º � Ý%Ý Ç Ë<Ò%Ò è%Ê è Ó ÝIÝS �I�¨ù5�d´lI·¾¥�_�¥�¥¾LM Ò ç Ë<ÔKÓ è Ó U º

S]Ë Ý U ý º¥»Â©¥©¥�d�W�¥£¥���'¡Â�I¢Éº]­�Öp¾KÃ[�_º,���'¡�¡Wº � ºd­�ÝIçKÝ�ç Ë ­ Ó7Ô%Ô%× ºS]Ë ç U ëkº � �7�C�7¡��I­�Öp¾KÃs�Wº,���_¡�¡Wº � ÝIçKÝs­�ç Ë Ç ÓIÔIÔ%× Ê'ºS]Ë è U õ ¾¥� õ Ñ ú $5ÖB�­!¶�%�¨Ís�d�¥¹ ý ���%«¥�}­�ìáÑnë5ò�Ðg��» � ÏgÖ £ � Ï Ô%Ì Ï Ó è Ô ÏEÑ Ç ÓIÔ%ÔIÌ Ê'ºS]Ë<Ì U È �%�ª©¥�d�¥�W£ È �3ìô�I�¥£���� £ ���/�_�ª���(�0�d¡��4�%� Ù ¡C�I�¥£��7��£àòc�[£¥�_¢��N�(¹%¹I�uÏ � �%���%�¶Öp���7Ï£¥«¥�'¡C�d�%��{M�d¡�¾ Ó º Ë ÏvÝ[º Ø ¬r© −1

�I¬¾�3�7¡#�[­ õ ¾¥� õ Ñ ú $ÂÖm�O!¶�%��ÍG�(��¹ ý �¨�%«¥��¬r�%��¡�¾¥� È �3ì�I�¥£x� Ô È �%¢d¢��I©,�%�C�1¡C�(�I�¥�W­ È �3ì�$Â�I¡�� Ò%Ò%Ò%Ì ­����n$Â�7¡C�§Ý Ò%Ì%× º

S]Ë<Ò U:NeO�OAPQoRR�V�V�V�Uqp8T�]egrUq`�^�s%R ºSÞÓIÔ U:NeO�OAPQoRR�P�f�tLg?XAu"UvV?SatU�uaS8_ATU�uZNwR�P�f�twgeXAuAR ºSÞÓ[Ë U ý º�Ö º ö �I�#ÍG���%�}­ � �Y�I�0�uÏ�[�$Ï Ë è Ó Ïî´ Ë ­ ÓIÔ%ÔKÓ ºSÞÓ%Ó U åuÖp���%�¨�/�_�_¡�«¥� ì��I���I�kÑp¢(�W�'¡C�¨�%� È �[�%¢d�(�¥¹ Ù Ãs�¨¡��W�ô¬r�%�}¡�¾¥�nëM�W�_Ãs�_¢(�W�gæ#­ ö º·»¤º<ò��I�Y���I�#¾�¢��I�­ìáÑnëÂò�Ðg��» � Ï õ ò�Ï ÓIÔ ç Ë ºSÞÓI× U å õ ¾¥�­����ëM«¥�cÐ�Ðw��«¥�~�d�¥�%�¨�d¡EÃ�ò��%�¥�]¡C�%�gæ#­ È º,ò��(�I�¥­�ì��_���0�(¢(�I©[Ï È �I��¬�Ï Ò%Ì M ×%Ò ÝUÏEÑLº

Ë Ý%è

Page 159: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

SÞÓ1Ø U ��� È �I¢(¢��7©/�%���7¡C�d�%�­ Ù º¥»Â©��I�#¾¥���'¡N�I¢Éº]­ Î ©����W�u´7�7¡C�d�%���I¬�¡C¾¥� õ �%�xF4«¥�I��Í�­�Öp¾KÃs�Wº�ëM�_´,º���_¡¨¡Yº�è Ø ­ Ó ç ×%Ó Ç Ë<Ò%Ò ÝIÊ'º

SÞÓ Ý U È �3ì È �I¢(¢��7©/�%���7¡C�d�%�­1ìvºK»Â©/�N�_¡w�I¢½ºd­ Î ©¥�¨�W�u´I�1¡C�(�I�~�I¬/¡C¾¥� õ �%�EF3«��7��Í�Öp���s£¥«¥�'¡C�d�%�~�d�pp

È �I¢(¢(�d���d�%�¥�Ô{M�d¡�¾í¡�¾¥� È �I¢(¢(�d£¥�W�°�Â�_¡C�_�_¡��%�ª�7¡¤ì��W�¨�~�d¢��I©­}Öp¾GÃs�_ºáëM�_´,º ���'¡�¡Wºáè Ø ­ Ó ç Ó çÇ Ë<Ò%Ò Ý%Ê$º

SÞÓ ç U õ ¾¥��� Ô ���YÃ%�_� Ô �¨�(¢(�d�W�%��¹I���%«¥�}­^� Ô � �YÃI�W� Ô È �%���W�W�[¡C«��I¢ �Â�W���d¹%��ëM�W�,�%�u¡Y­ ÓIÔIÔIØ ­^���$N�I¡C� Ø%Ø�Ë Ý[º

SÞÓ è U å@��� Ù �(¢d¢(�d�W�%� õ �C�7�#ÍI�W�M¬r�%�MëM«¥�cÐ�Ðg�1æC­�ÑLº%jA�UÜu¬��I��J7­�ìáÑnë5òcÐg��» � Ï ÈLÎ $Âì Ï Ô�Ë Ï ×%ÌKÓ ºåyF4«��W¢(ÁG«¥�_�L�'²[�,¦W���d�W�¥�_�W�¹%�C�Y´s�d¡C�I�K¡N�I«�¡C�I«¥�L£¥«c�¥���%©�¢(³W�0�3£¥�A¹%¦_�¥¦W���7¡C�d�%��£¥�A�.�7�����_�uæC­ÑLº%jA�UÜu¬��I�oJI­ õ ¾¥³_���§£¥�����3ëA­ È ÖnÖwòí­,�~�I� ÓIÔ%ÔKÓ º

SÞÓ7Ì U å@�5�_���d¹%�0ëN�_�/�%�u¡á¬r�%�¼¡�¾¥� È �W�K¡��C�I¢�ì¼�d©/�_� õ �C�I�#Í7�W�gæ#­%¡C¾������¸�_�%¢(¢½ºd­7ìáÑnë5òcÐg��» � ÏgÖ £ � ÏÒ%Ì Ï Ô%Ò Ý<ÏgÑL­[¾��W�[Ïî�'²�M Ò%Ì%ÔI×%ÔKÓI× ºSÞÓ7Ò U:NOOAPQoR�R*V�V�VGzA\e{mUWp8T�]eg|UW`�^�s%R*}AfT�~8�AN?c%heXAuhAR�����LRa_eS�hZfGg�OGhARapLXZT�]?g�Ra�L�Z�LRa�w��{abLRS°×IÔ U:NOOAPQoR�R*V�V�VGzA\e{mUWp8T�]eg|UW`�^�s%R*}AfT�~8�AN?c%heXAuhAR�����LRa_eS�hZfGg�OGhARapLXZT�]?g�Ra�L�Z�LRa�e{�abLRS°×[Ë U:NOOAPQoR�R*V�V�VGzA\e{mUWp8T�]eg|UW`�^�s%RehA^g8SaTL^?X�\%R ºS°×%Ó U å õ �W�#¾¥���(�Y�7¢��5�W�¨�(¹%�ÕëM�W�,�%�u¡á¬r�%�®¡�¾¥� È �W�K¡��C�I¢�Öp�¨�W��¾��W{w�W�gæ#­sò¶º7»L£��I�0�á�_¡p�I¢Éº]­5�����¥�I¡��×%Ô[ËYØ º

S°×I× U å õ �W�#¾¥���(�Y�7¢p�5�W�¨�(¹%� ëN�_�/�%�u¡4¬r�%�3¡C¾��.ì��%�0{��I�¨£íÖn�¨�W�¨¾¥�s{v�_�uæ#­ »¤º ý �%�¨£¥�W�'´Û�_¡§�I¢Éº]­-����¥�7¡C� ×IØ%Ø Ý[º

S°×7Ø U åu���_´I�W¢ Ë.õ ���d¹%¹%�W��{M�]¡C¾í�¥���_«¥£¥�¿»�$��9M Î ë õ �W���0�uæC­Ñ�¤º¼Ñp£¥�¤«¥�¥£¥�§�_¡¤�I¢Éº]­0��� �¥�I¡��× ç Ì%× º

S°× Ý U å � Ön¾KÃs���d�W�4{M�]¡C¾�¡C¾¥������£¥�'¡C�W�'¡C�%� £ �¥¹I�C�I£¥�§�(��ëN«��¿Ð�ÐÉæC­�»¤º/��«��W�I¡¨¡C�I­G$N«¥�W¢½º,ÐE���¨¡C�_ºò��'¡C¾º�» Ø%Ø ç Ç Ë ç Ò Ï Ë è%Ý%Ê$­ Ó7Ô%Ô%Ô ºS°× ç U å õ ¾¥�a��� �5�_¡��W�_¡��%�uæC­ Ù º »5©¥�I�#¾¥�v�'¡Õ�I¢½ºd­�$«��W¢Éº ÐE�¥�u¡C�Wº®�I�¥£âòc�_¡C¾��[£¥�_­¼» ×%×%Ì Ç Ë<Ò%ÒIØ ÊË<Ì Ý[ºå õ ¾¥�°��� £ �¥¹%�C�7£¥�I­ Ù º�»Â©��I�#¾¥���'¡Â�I¢Éº�ì¼ÑiëÂò�Ðg��» � Ï ÈLÎ $5ì Ï Ò ÝUÏ Ë è%èUÏEÑMºøæS°× è U å õ �W�#¾¥���(�Y�7¢í�5�_���d¹%��ëM�W�,�%�¨¡i¬r�%�n¡C¾¥� £ �¥¹%���I£¥�Â�I¬¡C¾��5Ð È � ¬r�%�¢��� ëN«���Ð�ÐÉæC­ej�º��5�3�'¡�I¢½º���� �¥�I¡C� Ó ç Ì ç�º

S°×IÌ U å@��� È �I¢(�I���(�0�_¡��W� £ �¥¹%���I£¥�_�M¬r�I� õ �'´I�1¡C���I��ëM«¥��Ð�ÐÉæC­����W�¨¢(�(� ý �¨�[�_��¬r�%�v¡C¾��ª�Ô� È �%¢mÏ¢(�I©/�I�C�7¡��(�%�­���� �¥�I¡C� ØGÓ1ØKÔ º

S°×IÒ U å õ �W�#¾¥���(�Y�7¢¾�5�_���d¹%�¿ëM�W�,�%�¨¡N¬r�%�M¡C¾¥� È �W�K¡C���I¢¼ò�«¥�%� Ù Ã[�u¡C�_�ÕæC­ � º � �7¢(£¥�d���'¡3�I¢½ºd­¸����¥�7¡C� ×%× ç%Ý Ç Ë<ÒIÒ è%Ê'º

S·Ø%Ô U å õ �W�#¾¥���(�Y�7¢®�5�_���(¹I�àëN�_�/�I�¨¡¤¬r�I�§¡C¾���ì��%�M{v�I�¨£�ò�«¥�%� õ �I�#ÍG�(��¹7æ#­ ý º�»Â¢(�'²[�_�_´ß�'¡��I¢½ºd­�����¥�I¡�� ×I× ç%ç�º

S·Ø�Ë U ò¶º�»5©,�%¢d�(�¥���'¡Â�I¢É­[ÐgÑiÑnÑ õ �C�I���WºL$«��W¢Éº Ù �W�(�_�¥�W�§Ý Ë �d����«�� × ­ ×IØKÔ Ç Ó7Ô%ÔIØ Ê$ºS·ØKÓ U ö º � Ãs�¨¡����(�#ÍKÃ��'¡5�7¢É­�ÐgÑnÑnÑ õ �C�I�¥�_ºL$«¥�_¢Éº Ù �W�(�_�¥�W�¤Ý Ë �(�¨��«¥� × ­ × Ý Ë Ç ÓIÔIÔIØ Ê'ºS·Ø%× U ý Ñp»�$ õ Ï È Ñië�$ �����%¹%���I� ¢(�d©¥�C�7�¨Ãà¢d�%�¥¹Ï{M���d¡��W«¥�Û!±Ý Ô�Ë<× ­iòíº ý �[�I�����_�¥�.�'¡��I¢½ºd­NO�OAPkQoR�R�V�VVGX[Tep�^|U�uaS8_8TkU�uZNLR8]�h�\�^uR�Pe\�pe\LX�_�R8`eS�]*T?O�U�Pe\ep º

S·ØIØ U:NOOAPQoR�R*V�V�VGzA\e{mUWp8T�]eg|UW`�^�s%ReuA^��PfOwX[T?`�R��L^�TO�SA�e]8_%g�^RheXK�efLgA]aOwX8^�TLRa\e{�hX[�kUvNOA�Gg ºS·Ø Ý U:NOOAPQoR�Ra_�^�^�O�U�uaS8_8TU�uZNLR*\�_Af�P�]egeR º

Ë Ý Ì

Page 160: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

S·Ø ç U:NeO�OAPQoRR�V�V�VGzA\?{BUWp8T�]?grUW`�^�sLR�}AfT%~a��NecLhX�u�h�RuhAReua]Ap�R ºS·Ø è U åy� õ ì�I}¾¥�(�u¡C�%¹%���I�0�~�d�¥¹~�0�_¡�¾¥�s£�¬r�%��/���£¥�(�¥¹�¡��C�I�#ÍG�_º õ ¾¥�Õ�I¢(¹I�%���]¡C¾¥��£¥�_���_���(�[¡C�(�I�[æ#­»¤º�jA¾¥�I�¥�<´,­ Ó7Ô%Ô%Ô ­[���n$Â�7¡C� × è%è Ì º

S·ØKÌ U å È �W�K¡��C�I¢á¡��C�I�#Í��'²s¡C���I�/�I¢��7¡��(�%��¡�¾¥���I«¥¹%¾µ¡C¾¥�/� Ô £¥�'¡C�_�_¡C�I�uæ#­ ý º��N�W�¨ÍI�_¡�¾­ ÓIÔ%Ô%× ­���$Â�7¡C� ØKÔ è Ò º

S·ØKÒ U åuÖp���d�.�I�uà ú �_�¨¡��'² ëM�W�_�%�¥�¨¡���«¥�'¡C�d�%��©GÃ�ò��Y�I���í�7¬.»L£��7��¡C�]´%� ú �W�u¡C�'²�ì¼�d¡¨¡C�(��¹7æ#­M»¤ºÙ �#¾r{v�I�¨¡�JW�~�I���7�¥£ È º õ «¥¢d¢dÃ%­ ÓIÔ%Ô Ý[­[�����¥�7¡C� ØKÌ�Ë<Ò º

S Ý Ô U:NeO�OAPQoRR�V�V�VGzA\?{BUWp8T�]?grUW`�^�sLR�P�N?cLhad%X�\%R8S*��X�\�Ra\e{d*P?_LX�s?]8O?S?R8S*��X�\ed%X[TeO_%^rUvNOA�Gg ºS Ý Ë U å¨ò È �¨¡�«¥£¥�(�_�4�I¬Ü¨�_¡k�I¢d¹%�%�¨�d¡C¾��~�M�(�¿¡�¾¥�Õë £ $�Ð�ÐL¬r�C�I�0�l{w�%�¨ÍKæC­ ÓIÔIÔ%Ô ­�pºí�5«8Ú��I¡k�7�¥£ëAº%�Â�d���%�¨ÍGÃI­ �����¥�7¡C� × è Ø ç�º

S Ý Ó U åg» È �%�0���I���d���%�c�I¬ È �%�¥�§�I�¥£lj õ »Â¢(¹%�I���d¡�¾¥�0�v¬r�%�L¡C¾¥�§ëM�W�W�I�¥�¨¡���«¥�'¡C�(�I���I¬á�i�N�(¹%¹%�� �%�¨�%�c�7¡ Ë%Ë<ÔÕý � ú æC­ Ë<Ò%Ò%Ì ­¥»¤º�Öp�(�_���_�I­ ���n$N�I¡C� ×7ØKÌ ç�º

S Ý × U:NeO�OAPQoRR�V�V�VGzA\?{BUWp8T�]?grUW`�^�sLR�P�N?cLhad%X�\%R8S*��X�\�Ra\e{d*P?_LX�s?]8O?S?R�s�]8_GX*]atLgAS?hrU�NeO8�wg ºS Ý Ø U å ö �_¡��L�(��ëM«¥�¥Ð¨ÐÉæ#­ ÓIÔ%ÔKÓ ­ õ ¾¥� ö Ñ õ ò�Ñ õ ¹%�¨�%«¥�.Ï ý º � �W�¨���I��£���_¡M�7¢É­l����$N�I¡C� ×IÒ%Ì Ý[ºS Ý%Ý U å ö �_¡ÂÑp�¥�_��¹Ià ٠�Y�I¢d�A�7¡�� Ô ­ � º�»5©¥©,�I¡¨¡N�I�¥£��I¢(¢½ºd­ Ë<Ò%Ò ès­����n$N�I¡C� ×KÓ7Ì è[ºS ÝIç U:NeO�OAPQoRR�V�V�VGzA\?{BUWp8T�]?grUW`�^�sLR*��A�e\e]aTwXaSegR8�S?h*`�_%^�fPLRA��S�h�`_�^�f�PkU�NeO8�wg ºS Ý%è U å È �%�¨���W�'¡C�d�%�¥��¬r�%�L�ª«��%�¥�(�4©sÏdܨ�_¡��M�(�cÖ Ë èUæ#­ ÓIÔ%Ô è[­ ö º����W¢(¢d�%«¥�#¾­����n$Â�7¡C�kÝ ØKÌ ç�ºS Ý Ì U å õ �W{v�I�¨£¥�3òc�(���¨�(�¥¹%Ñ õ �W�_�¨¡��(�Y�1¡C�(�I���7�¥£�«¥�¥�W¢d«¥�¨¡��W�¨�W£��_�¥�W�¨¹IÃ��¨¡�«¥£¥�d�W£[æC­ ÓIÔ%Ô Ýs­Ù º È �I¢]´%�'¡N�I�¥£��I¢Éº[���n$Â�7¡C� ØKÒKÓ èsº

S Ý Ò U å õ ���(��¢(� õ �d�~�d�¥¹�»5���7¢dÃs���d�L�I¬ È �7¢(�%�¨�(�0�_¡C�_��ëM�Y�I£sÏE�%«�¡uæ#­%$kº � «¥�#¾¥�I���I�­ � º È �7¢(���I�_­!�º ý �W�(�u¡Y­�ëkºL$Â�<ÃGÃ%�I�W­¸�¤º Ù �#¾¥�I�ª©,�W��¹I�W�W­ Ó7Ô%Ô è[­[�����¥�I¡��§Ý ØKÒIØ ºS ç Ô U å Î ��¡C�d�~�d�C�7¡��(�%�~�I¬ ¡C¾¥�­��� Î �¥¢d�(�¥� È �I¢(�%�¨�(�0�_¡��W� È �7¢(�(©��C�7¡��(�%�.¬r�I�MëN«¥��Ð�ÐÉæ#­ ÓIÔ%Ô�Ë ­ëAº È ¾¥�(�#¾��§�7�¥£��7¢Éº]­����n$N�I¡C� ×%Ò[ËYØ º

S ç Ë U å Ù ¡�«¥£�Ãí�I¬L¡C¾��E$Â�I�à���(�¥�W�I���]¡Eõ�I¬L¡C¾��a� Ô È �7¢(�%�¨�(�0�_¡C�_�AëN�W�I£¥�%«[¡ È ¾��I�d�íæC­¼ëM�%©,�W�¨¡÷ �d¡��%«¥�­ ÓIÔ%ÔKÓ ­����n$N�I¡C� ×%ÒIÒ è[º

S ç Ó U åuÑp�¥�W�¨¹Ià ٠�Y�I¢d�¿�¨¡�«¥£¥�d�W���I��£��Y�I¢d�(©¥���7¡C�d�%���I¬A¡C¾¥�¹� Ô �W¢(�_�_¡����%�~�I¹%�¥�'¡C�d���W�I¢(�%�¨�(�0�_¡��W�«¥�¨�(�¥¹

Z0 �I��£ J/Psi → e+e−ëM«¥��ШÐ��_´I�W�K¡C�gæ#­ Ù �.�7�(�xjA�_���0�(�#¾¥�7­�»5«¥�¨¦W¢d�(�W��ò��_�¥£¥³W�_­

ò��I�¨�(�$Ï È ¢��7«¥£¥� È �%«����(���%«­�»5¢d�'²[�(� È �7¡C¾¥�_�¥�_¡W­ Ó7Ô%Ô Ý[­[�����¥�I¡�� ØKÒIØ Ý[ºS ç × U å õ ���(��¢(� Ù �7�~�¥¢d� Ù ¡C«�£¥�(�_�uæ#­ � º È �I¢(�¥�I�W­NO�O�PQoR�R�VV�VGzA\e{BUvN�S8p�UvY�f�TU�TLgR�R�RapAfLg�ga�`eSaTe\?]BUvP�NPL�?X�\?]A�e]�{��G�Z�e�~8�?~�{{A�Lz{A�Lze~A� ºS ç Ø U:NeO�OAPQoRR*\e{8\8teV?S*tUWpAT�]egrUW`%^�s%RhA]��%d8\�]aO?]�d8te_�^�VwhX[Te`LR��_�^���S?u�Oe�?S8pLX�TwXZOGX�^�TGh"UWNO8�Gg ºS çKÝ U ¾G¡¨¡C�&I�MaM�{¢{¢{�ÏE£ Ô º°¾¥�'¬gº°ÍG«¥�}º°�¥¢�M8MI�I�¨ÍG»5���#¾��d´%�7º°��¾¥�� Y©��I��� > �I¹%�W��£��8D4�Y�7¡��W¹ > � Ô è Ë%Ë%ËYØD4�(£ > � Ô è Ë%Ë%ËYØ � Ë ¡ Ë M1¡C���I�¥�¨���I���_�¥�W�d�W��M[ºS ç%ç U åuÑp¢(�_�_¡C�¨�%�c�I�¥£�Öp¾¥�I¡C�I��ÐE£¥�_�K¡C�0/¥�Y�7¡��(�%��{M�]¡C¾c� ÓIÔ £��7¡C�1æ#­ Ó7Ô%Ô%Ì ­ Î º�»�¡��C�I�0�W�K¡��U´,­

�¤º � �I�¥£�«¥���d�­sù¤º � «}­ � º È �I¢(�¥�I�W­sÑLº È �I�¨���_�C��­l�¤º��«¥¹%¹K�I�}­�»¤º[ì��W���I�/�I�G¡��<´/­�ò¶º õ �IÍ1�1Ͼ��I�¨¾¥�É­ õ º £ JW©KÃ%�IÍI�<´7��­w�§ºJR3�(�­��Ô���¥�I¡��¤ÝIèIç Ë º

S çKè U å Ù �d�¥¹%¢(�¶Ñp¢(�_�_¡C�¨�%��Ñr30�W�(�_�¥�W�d�W�¿�d�ô� Ë èÈ�3�7¡#���7�¥£�ò��%�K¡��'Ï È �7��¢(� £ ���d�¥¹�� ËYÌ º Ô Ý[º ÔIÔ£ Ô �_�%���¨�W�'¡¨æ#­ ö ºL�5�YÃs�Â�'¡N�I¢Éº]­��������I¡C�§Ý Ë<Ô Ý[º

S ç Ì U åuÑp¢(�_�_¡C�¨�%�c���(ÍI�_¢(�d¾¥�[�s£��d�c� ÓIÔ æ#­ ÓIÔ%Ô%Ò ­�ò¶º�»L�%ÍG�É­��Ô�n$Â�I¡��kÝIçKè%ÝsºS ç Ò U åg»5�u¡C�d�W���7¢�¥�W«��C�I¢��¥�'¡«{v�%�¨Í�«����(��¹~�_�W�K¡C���I¢®�����W�¨¾¥�s{v�_�3£¥�'¡C�W�'¡C�%�Â�(��¬r�I���~�7¡C�d�%�.¬r�%�N�W¢d�W�'Ï¡C�¨�%�c�I�¥£c�¥¾¥�I¡��%�����_¢(�W�'¡C�d�%�[æ#­ ÓIÔ%Ô%Ì ­[ùªº � «��I�¥£��I¢½ºd­[���n$Â�7¡C�§ÝIçKÝ Ô º

Ë Ý Ò

Page 161: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

S è Ô U å Ù ¡�«¥£�ÃÕ�I¬}�W¢d�W�_¡����%�Õ¡C���I�#Í��~�7¡C�#¾¥�d�¥¹A���I���I�~�'¡C�_���>{M�d¡C¾~ëM«¥�~ШÐE©.£��1¡#�1æC­ Î ºK»�¡��C�I�0�W�sÏ¡��U´��I�¥£��I¢Éº]­������¥�I¡��¤Ý7ç × Ý[ºS è Ë U å £ ¡C�(¢d�¡J_�(�¥¹ È ì õ �I�¥£ Ù ò õ ¾¥�d¡��ª�W�%«��G¡¤¬r�%�¤�¥¾��I¡C�%���7�¥£à�W¢d�W�_¡����%� ���W�_�%�¥�u¡C��«��_¡C�d�%�[æC­ÓIÔIÔIØ ­ Î º�»�¡��C�I�0�W�K¡C�<´,­8R�º�ò��I�C�Y´s�(�}­ �����¥�I¡�� Ø%Ø%Ø%Ø º

S è Ó U:NOOAPQoR�R*V�V�VGzA\e{mUWp8T�]eg|UW`�^�s%R�P�N?c%h8d�X�\�R*O?]afwX�\�R*O?]afwX�\�UvNOA�Gg ºS è × U åuëM�W�_�%�¥�¨¡���«¥�'¡C�d�%���I¬ τ

¢d�W��¡��%�¥�N�(��¾¥�I£¥���I�¥�(�9/����7¢®�u¡#�7¡��W�3�1¡�����ëM«¥� Ó æ#­ ÓIÔ%ÔI× ­ õ ¾¥����

τÏî�(£�¹%���I«¥�­ �¤º È ¾��7Ís���I©,�%�¨¡EÃ��7�¥£��7¢Éº]­����n$N�I¡C� ØGÓsË<Ô º

S è Ø U å Ù �d�¥¹%¢d� Ñp¢(�_�_¡����%� Ñr30�W�d�W�¥�_�(�_�µ�(�ô� Ë è �3�7¡C���I�¥£ ò��I�G¡��'Ï È �I��¢d� £ �¨�(�¥¹�� Ë<Ì º Ô Ý[º Ô%Ô£ Ô �W�%�¨���W�'¡¨æC­ ö ºL�5�YÃs�N�I�¥£��I¢Éº]­ ÓIÔ%Ô ç�­�����$Â�I¡��¤Ý Ë<Ô Ý[º

S èIÝ U Ù �%¾¥���I©x�Â�%�¨�C�I�d��åg� ×Õõ �I« õ ���(¹I¹%�W�gæ#­NO�OAPkQoR�R�V�VVGzA\e{BU�N%S8p�UvYAfTU�TLg�RR*pAfLgg*�`eSaTe\?]BUvP�NPL�?X�\?]A�e]�{��A�?{e¢a£�pGX�\e���� º

S è7ç U å τ �d£¥�W�K¡��(�Y�1¡C�(�I��{M�d¡C¾��¥�_«¥�C�7¢ ���_¡«{w�%��ÍG�¬r�I�L� Ë èª£��7¡C�1æ#­ ÓIÔIÔ ç�­ Ù º�Öp�¨�I¡C�%�,�%�,�W�¨�W«��I�¥£Ö º Ù ´%�I�(��ÍKÃI­��Ô�n$Â�I¡��§Ý Ô%ÒIØ º

S èIè U å Ù �W�I���#¾ ¬r�%�ZH → e+e−bb

�I�¥£ZH → µ+µ−bb

Öp���s£¥«¥�$Ï¡��(�%� �(� Ø º Ó ¬r©

−1

�7¬ £��7¡C� {M�]¡C¾ ¡�¾¥� �Ô� �5�_¡��W�_¡��%� �d�pp

È �%¢d¢(�mÏ�¨�(�%�¥� �1¡ √

s = 1.96õ � ú æ#­ È �I��¬r�W�¨�W�¥�_� $N�I¡C� Ý Ì èIç1Ï ÈLÎ $Âìv­ ÓIÔIÔ%Ò ­

NO�OAPkQoR�R�V�VVGzA\e{BUWpAT�]egrUW`%^�s%R�}AfT�~8�AN?c%heXAuhAR�����LRa_eS�hZfGg�OGhAR�Pe_?Seg?XK�wR�¤w��¥¥¦?R�¤?�G�aR ºS è Ì U {¢{¢{�ÏE£ Ô º·¬r���7¢Éº·¹%�<´�M1�W�%�0�¥«�¡��(�¥¹�M1£��7¡#�JjNÁG«��7¢(�d¡EÃIºS è Ò U � Ô �3�7¡#��F3«��I¢d�d¡EÃ È �[�I��£¥�d���7¡C�d�%�­NO�OAPkQoR�R�V�VVGzA\e{BUWpAT�]egrUW`%^�s%RuA^��PfOwX[T?`�Ra\e]8O?]dA§8f�]?geX�Oc%R*\?{�daPe_GXZs�]aO�SeRap�^a_8fwhaSA_%hrU�NeO8�wg º

S°ÌIÔ U ægÖ)R õ �NÐE» ç[º Ó Öp¾KÃ[�¨�(�_���I�¥£.ò��I�G«��7¢]æ#­ õ º ٠ܨ�%�¨¡��C�I�¥£0�_¡v�I¢½ºd­K�7�u²[�d´¨I°¾¥�_�[ÏE��¾LM Ô�Ë<ÔIÌKÓ ç Ø ºS°Ì[Ë U ò¶º°�nº¼ò��I��¹K�I�¥�¿�'¡Õ�I¢½ºd­�»3��Ö ý Ñm$k­¼��¹%�W�¥�_�C�7¡��%�§¬r�I�§¾��7��£ß�ª«�¢d¡C�d���I�u¡C�%�í�¥���s�W�_���ª�d�¾��7£¥���%���(�3�_�%¢(¢d�(���d�%�¥�_­ ö �ÂÑiÖ Ô è[­ Ô%Ô�Ë Ç ÓIÔ%Ô%× Ê$º

S°Ì%Ó U å¨ò��1¡C�#¾¥�d�¥¹ ���I�u¡C�%� �¨¾¥�s{v�_��� �I�¥£ �~�7¡C�¨�]² �W¢d�W�0�W�K¡C�[©7­ Ù ºª�Â�s�#¾¥� �_¡ �I¢½ºd­�I�uù3�]´1I·¾¥�W���¥¾LM Ô ç ÔKÓIÔ%×�Ë Ç ÓIÔ%Ô çKÊ$º

S°ÌI× U åy�N�Y�Y´GÃ��Y´%�%«¥�µ�¨�W�0�<´I�7¢��I�¥£�£¥�'¡C�W�¨�~�d���7¡��(�%�ô�7¬~{w�W�d¹%¾K¡C�d�¥¹�¬��I�_¡��%���¿¬r�I��!�� ܨ�_¡��ò��I�G¡��'Ï È �I��¢d�7æ#­[�¤º ý �d¢(¢d©/�_�¨¡Y­ ÓIÔ%Ô ç�­�����$Â�I¡��¤Ý ËUÓIÒ º

S°Ì7Ø U ò��(Í1� ú �W�u¡C�W�¨�(�¥�_�­ åuÑiò �_�¥�W�¨¹Ià �Y�I¢d�(©¥���7¡C�d�%� �I��£ ���0�Y�UÏ�¨�(�¥¹7æC­ Ñiò�Ðj� �0�W�_¡��(�¥¹ £�«¥���d�¥¹ �W�%¢d¢��I©,�%���7¡C�d�%� {w�W�_Í�­ ì��$Ï©¥�¨«��I�uà ÔIØ ­ ÓIÔ�Ë<Ô ­ ¾K¡�¡��¥� I�M8M1�¥¢(�%��� Ø ºQ¬r���I¢½º°¹%�<´?MIÖ Ë Mf� Ô !Ú�(ÍG�«M1�%©sܨ�W�'¡¨Ï�d£LM7�W�0�(£%M7�W�¤¡��[�I¢«M7�_�~�¨�W���I¢(«�¡��(�I�QjN�W�7¬r�ZM7Ñwòc���W�¨�%¢(«[¡C�(�I�6jM�Y�7¬r�pjM´ Ô%Ô Ï Ô è<Ï ÔKÓ º

S°Ì Ý U:NOOAPQoR�RAS*TUvVGX�YGX[P�S8\GX*]BUo^*_`�R�VGX�YGX8Ra�_�c%h�O%]eg8dab%]eg�g8d�p8f�TGu*OGX8^�T ºS°Ì ç U ågÐ È ë�Ñp¢d�W�_¡����%�ÕÑr30�W�d�W�¥�_�(�_�n¬r�I�pëN«��¥Ð�Ðg�1æC­ � º È �7¢(���I�_­ ö º�j4�C�I«¥�_­ õ ºkRw�I�¨«¥£���­^�Ô�¸�¥�I¡��Ý ÒI×%Ò º

S°Ì è U åg� Ó7Ô Ð È ë Ñp¢d�W�_¡����%��ÐE£¥�_�K¡C�0/¥�Y�7¡��(�%�[æC­ ö º%j4�C�7«¥�M�_¡Â�I¢Éº]­��Ô���¥�I¡��¤Ý7ç Ò�Ë ºS°ÌIÌ U å ý �W�¥�_�C�7¡��%�A���_´I�W¢iëN�V{v�_�(¹%¾K¡��(�¥¹��I¬w� õ �7¬ ÷ � �%���I�[æ#­�òíº Ù ¾��I�0�(� �I�¥£ õ º � �%¢]¡C�%�­���¬$Â�I¡��§Ý%ÝIçKÝ[ºS°ÌIÒ U å õ ¾¥�¤ëN�_¢��7¡��d´I�ª�5�7¡#�1Ïgò��%�K¡C� È �I�¨¢(� ö �_¡4Ñp�¥�_��¹Ià ٠�W�I¢(�$æ#­L$kº}ò��IÍI�<´%�_�I­ ö ºøÏgìwº ý �¨�d´7�aJI­

���¬$Â�I¡�� ØKÌ%Ô è Ç Ó7Ô%Ô Ý%Ê$ºS°ÒIÔ U å Ù ¾��d¬ ¡C�d�¥¹¥­ Ù �0�Y�I�¨�(�¥¹Õ�I��£�ëM�W�0�<´[�d�¥¹ Ù �d�ª«¥¢��1¡C�W£ ö �'¡C�gæ#­%$kº,ò��IÍI�<´I�W�ª�7�¥£ ö ºQÏEìvº ý ���]Ï´7�aJ7­����n$N�I¡C� ØKÒ�ËWØ Ç ÓIÔ%Ô Ý%Ê'º

Ë ç Ô

Page 162: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

S°Ò�Ë U å Ù ¡�«¥£¥�(�_�M�I¬¼»Â¢(�¥¹I�W�����I���I�~�'¡C�_�W­��W�I�����_�_¡��(�%�¥�M�7�¥£��7�����s�W�(�7¡C�_£�«¥�¥�W�_�¨¡C�I�(�K¡C�d�W�gæ#­!�º�ì¼�d��¾¥�_�W­ ö º%�Â�I¢(�'Ã%­ �¤º�Öp�¨�(�W�7­����n$N�I¡C�§Ý Ò ç%ç�ºS°ÒKÓ U ò¶ºsëÂ�I��¹%�W¢½­1å ú �_�¨¡C�$² È �%�?/��¨�.�1¡C�(�I� Ù ìÛ¬r�%� ö �'¡C�gæ#­ È »3� ý Î ò��W�'¡C�d�¥¹¥­sò��Yà ÓIÔ ­ Ó7Ô%Ô%Ò ­NO�O�PQoR�R�VV�VGzA\e{BUvN�S8p�UvY�f�TU�TLgR�R*pAfGg�g*�`?S*T?\e]mU�PN�PG�eX�\e]��]{����~�� º

S°Ò%× U ö Ïgìvº ý ���]´7�aJI­ õ �I¢dÍ5�d�3¡C¾¥�iì��W©¥�¨«��I�uà ËUÓ ­ ÓIÔ%Ô%Ì ú ö �'¡C�{w�%��ÍG�(��¹N�0�W�'¡C�d�¥¹¥­W¾K¡¨¡C��I�M8MW{¢{¢{�Ï£ Ô º·¾¥�'¬gº°ÍG«¥�º·�¥¢�M8MI�I�¨Ís»Â���#¾¥�]´%�7º°�¥¾��� <©¥�I��� > �7¹%�W�¥£¥�8D4�Y�7¡��W¹ > � Ô%Ì%Ó ç%ç8D4�(£ > � Ô%ÌKÓ ç%ç7� Ë ¡ Ø M¡C���I�¥�¨���I���_�¥�W�d�W��Maj5Ïî¬��I�'¡C�%�¨�Wº·�/£�¬gºS°ÒIØ U ö º È �7�~�¥©,�W¢d¢É­�ëAº­j�º Ñp¢d¢(�(�_­�Öp¾KÃ[� ëN�'´ �¤­ ú �I¢ ç Ô ­ Ë%Ë<×%ÔIÔ ç Ç Ë<Ò%ÒIÒ Ê'ºNO�O�PQoR�RZ��u�pa�kUWpAT�]egrUW`%^�s%R º

S°Ò Ý U ò¶º��pº È �(�W�_�%¢(�d�¥�É­ Ù º®�5�]¡�¡��.�I�d�W�0�I�¥£�ò¶º�j4�¨�~�_�W­wÖn¾KÃs�Wº�ëN�'´/º��¤º ú �%¢5ç Ì ­ Ô è ×%Ô%Ô%×Ç Ó7Ô%Ô%× Ê$ºS°Ò ç U:NeO�OAPGh"Q�R�R�PLg�^�T�S8��UWpAT�]egrUW`%^�s%R����*R��?{8�wXZYGX�RuA^Z�?PLRua]�p�Rua]�p�pe]A§%R*®8fA��XZ}?S*�LS�X�`8N?O ºS°Ò è U å õ ¾¥�N¢(�%��¹%�d¡�«¥£¥�(�¥�I¢[�¨¾��I�,�M�I¬}¡�¾¥�M¢(«¥�0�(�¥�I«¥�á���_¹%�(�I�~�1¡��Ô��¯¯]­��§º Ù �#¾¥�W¢d¢(�~�I�­^���°$Â�I¡��Ý ËYØKÓ º

S°Ò%Ì U:NeO�OAPGh"Q�R�R�PLg�^�T�S8��UWpAT�]egrUW`%^�s%R����*R��?{8�wXZYGX�R�O\e]§?R�OLha`�Rua]�pAO_LX*`�`eS8_LRhX[T�`�g8S�SAO_LX�`e`eS8_%h ºS°Ò%Ò U åuëM�l{w�W�(¹I¾G¡��(�¥¹Õ�I¬ »Â¢(�¥¹%�_�¯·� ÷ ©,�%���%��¡��C�I�¥�u´%�_�����§�~�I�~�_�G¡�«¥� �d���ª«¥¢]¡C�Qܨ�'¡�¡C�I�/�%¢d�%¹%�d�W��(��� Ë èUæ#­ Ù º È �I¢d´I�_¡Â�I�¥£��I¢½­����n$N�I¡C�§Ý × çKè[º

S]Ë<ÔIÔ U å õ �I¹%¹K�7©¥�(¢d�d¡EÃ��d��Ö ËYØ ���I�¨� Ó £��7¡C�1æ#­ È º ý �W�¨©/�_�W­¥ÑLº Ù ¾��I©��7¢(�(�¥��­ ý º Î ¡��W�¨�¤Ã ý �I��J_�%�­ÓIÔ%Ô ç�­�����$Â�I¡�� Ø%Ò%Ò Ý[ºS]Ë<Ô[Ë U å Ù ¡�«¥£¥�d�W�L�I¬ õ �7¹%¹K�I©¥�d¢(�]¡EÃ~´s�Wº��¥Ö ú ¬r�%�L� Ë èUæ#­�Ð#º�»5�¥¹%¾��W¢É­����n$Â�7¡C�§Ý Ó7ØKÔ ºS]Ë<Ô%Ó U åg»±$N�W«¥���I¢!$Â�'¡«{v�%�¨Í�©[Ïî¡C�I¹%¹%�d�¥¹ õ �[�%¢mæ#­ õ º Ù �Y�7�¥¢(�%�}­����n$N�I¡C� ØKÌ%ÌIÒ ºS]Ë<ÔI× U åuÖ �W�¨¬r�I���~�I�¥�W�§�I¬á¡�¾¥�&��J_�W�¨� ØK×%Ò $²$�©[ÏÉ¡#�I¹I¹%�(�¥¹ õ �[�%¢��%��� ÓIÔ �3�1¡#�%©7­ õ º ý �I£[¬r�%�¨¡�I�¥£c�I¢½ºd­�� Ô $N�I¡C�kÝIÝ%Ý Ø ­��Â�W�W�_�ª©,�W� Ë<Ò ­ ÓIÔIÔ è[º

S]Ë<Ô7Ø U å £ �/£��1¡C�í�%� ©[ÏîÁG«��I��͠ܨ�'¡¿�(£��W�K¡C�d�Y�7¡��(�%�"{M�d¡�¾ Ù �_�W�%��£��I�¨Ã ú �W�u¡C�$² �¨�W�_�%�¥�¨¡���«¥�'¡C�d�%�«¥�¨�(�¥¹/� Ô �¨�W�_�0´I�W���¨�(�%�c� Ë<× æ#­ ÓIÔIÔ%× ­��pº�ì��W¢d�(¹%�d�%�¥�/�I�¥£c�I¢½ºd­��Ô�n$Â�I¡�� Ø¥Ë<ÌKÓ º

S]Ë<Ô Ý U åuÖ �W�¨¬r�I���~�I�¥�W�4�7¬¼¡C¾�� Ù ú õ ©sÏî¡#�7¹%¹%�(��¹Õ�I¢(¹%�I���d¡�¾¥���%��Ö Ë è�£¥�7¡#�1æC­ ÓIÔ%Ô è[­ ö º È ¢d«�¡�¡��W�W­���n$N�I¡C�kÝ ×%Ì Ý[º

S]Ë<Ô ç U å £ �/£��1¡C�c�I¬3¡C¾�� ö ��ÐgÖ ©[Ïî¡C�I¹%¹%�_�0Ö®�W�u¬r�%���~�I�¥�_���d�ä� ËWØ M7���I�¨� Ó {M�d¡C¾ ö Ñ Ù Ý[º × æ#­��¤º� ¢d�[�#¾­ � º È ¢(�_�~�_�K¡Y­ ���n$N�I¡C� Ø%ÌKÓ7Ø º

S]Ë<Ô è U å ö �'¡N���]¬r�_¡��(�0�3©[Ïî¡C�I¹%¹%�d�¥¹7æC­[�¤º � ¢d�[�#¾c�I�¥£��I¢½º����n$N�I¡C� ØKÔ ç Ò ºS]Ë<ÔIÌ U ò��Y�7��«¥�¨�W�0�W�K¡á�I¬[©[ÏÉ¡#�I¹%¹I�(�¥¹L��3~�_�(�_�¥�_ç�I�¥£k�0�(�uÏÉ¡#�I¹I¹%�(�¥¹v�C�7¡��W�{M�d¡�¾ È Ù ÐgÖ¿�0�_¡�¾¥�s£[æ#­ëAºm�5�_�~�d�����I�¥£��I¢½ºd­[���n$Â�7¡C� Ø%ØK×KÓ ºS]Ë<ÔIÒ U åg©[ÏÉ¡#�I¹I¹%�(�¥¹~{M�d¡�¾ È �%«¥�K¡C�d�¥¹ Ù �(¹I�¥�W£µÐE�0���I�'¡AÖ¼�I���I�0�_¡C�_�4�~�'¡C¾¥�s£[æC­}ëAºm�Â�W�0�(�����7�¥£�I¢½ºd­[���n$Â�7¡C� ØKÔIØKÒ ºS]Ë%ËYÔ U å Ù �W�I���#¾�¬r�I�

ZH → l+l−bb�(� Ø º Ó ¬r© −1

�I¬­�5�7¡#� £ ���(��¹à�àëÂ�7�¥£¥�%� ì��%���_�¨¡��d��5�d�ª«¥�%�c�I�¥£x�5�d�W¢d�W�_¡����%��Ñá´%�_�G¡��Wºøæ#­,�pº�»5�¥�_«­ ö º � �I�#ÍG«¥�Cò��YÃ%�W�_­ � º È �7¢(���I�_­%j�º È ¾��I�­Ù ºz�5�_�C�I�½­sò¶º�j4�(�¨©GÃI­Gò¶ºsò�«�¢(¾¥�W�I���­GÑLº�$Â�I¹IÃ%­sòíº�$5�I�d�ª«¥£¥£¥�d�­%ÑLº Ù ¡��C�I«����W­ õ ºkRw�I�¨«¥£���­ÓIÔ�ËYÔ ­¾K¡�¡���I�M8M�{¢{¢{�Ïî£ Ô ºQ¬r���I¢½º°¹%�<´?MIëM«¥� Ó Öp¾KÃs���d�W�³M1¾¥�(¹%¹I�³M*J_¾6jM¢(¢(©�©LM7£ Ô jM�¥�¨�d´7�7¡��ZM7£¥���7¬ ¡C��M7�a30�W�(�I¢«MJW¾QjN¢d¢(©¥©QjÂ�7���I¢dÃs�¨�(��jL´ Ë º Ø º·�/£�¬gº

S]Ë%ËIË U Ù º È ���_�/�$ÏgëM�W���7«¥£¥�(�}­ ÓIÔ%ÔKÓ ­[���n$N�I¡C� ØKÔKÓ7× ºË ç Ë

Page 163: Recherche du boson de Higgs du modele standard dans le ... · Recherche du boson de Higgs du modele standard dans le canal de ppbarZH -> e+e-bbar, avec le d etecteur D0 aupr es du

S]ËIËUÓ U ò¶º�»Â¹%�W¢d�%«­ ö ºøÏg�pº¥»Â¹%�C�I� �_¡ È º�ëM�UÃI�%�­ ÓIÔIÔ Ý[­�����$Â�I¡�� Ø è%è%Ý[ºS]ËIË<× U õ �[�%¢dÍG�d¡ ¬r�I� ò�«¥¢d¡��d´7�I�¨���7¡�� �3�7¡C� »Â���I¢]Ã[�¨�(� {M�]¡C¾ ë ÎAÎ õ ­NO�OAPkQoR�R�O8�?s?]BU�hA^�fe_%uaS8p%^*_�`eSBUvT�SaO%R º

S]ËIËYØ U åuÑá´s�(£��W�¥�_�0¬r�%�A�¥�¨�[£�«¥�_¡��(�%�í�I¬L�¨�(�¥¹%¢d�ª¡C�s�%�íÁs«¥�I��ÍG�ª�1¡&��� ¯¯ ú º òíº®»Â©��aJW�<´Û�'¡ª�I¢½ºd­��� È �%¢(¢(�I©,�%�C�7¡��(�%�}­[Öp¾KÃs�Wº/ëN�'´,º ��è Ì Ç ÓIÔ%Ô%Ì Ê Ô�ËUÓIÔ%Ô Ý S �I�uù3�d´xI Ô%Ì%ÔI× º Ô è ×%Ò�S ¾¥�W�[Ïî�'² U*U ºS]ËIË Ý U ¾K¡�¡��)I�M8M�{¢{¢{�Ïî£ Ô ºQ¬r���I¢Éº·¹%�<´?MIëM«¥� Ó Öp¾KÃs���(�_�³M1¡��%�LM7��«¥©¥¢(�d�ZM1¬��7¢(¢ Ô çAM7���d�¥¹%¢d�_¡C�I�LM� õ jM�¥«�©¥¢(�d�kj¢{v�_©¥���I¹I�ZMf�5�_�W�d���(�I� õ �¨�W�_�Wº·¾G¡��~¢�´ª£�¡YºS]ËIË ç U Ù º}Ö¼�I�¨ÍI�Õ�I�¥£ Ù º ú �_���W¢d�É­�å@�5�d�¨¡C�d�¥¹%«¥�d��¾¥�d�¥¹�!µ���I�¥£å!Ú©�©í�����s£¥«¥�_¡��(�%���7¡3¡�¾¥��ì��W�gÏ�0�(¢(�I© õ �_´7�7¡����%�!©AÖp¾KÃ[�ÂëM�_´;� ú �%¢�ç Ô Ç ËYÒ%Ò%Ò Ê ÔIÒ%×%Ô%Ô%× º Ç ¾��W�[Ïî�¥¾LM Ò%ÒIÔ%×KÓI×�Ë Ê'º

S]ËIË è U j�º%�Â�_���¥�_�W­ × ì��W©º ÓIÔIÔ%Ò º�¾K¡¨¡C�&I�M8MW{¢{¢{�ÏE£ Ô º·¾¥�'¬gº°ÍG«¥�º·�¥¢M8M7�I��ÍG»5�¨�#¾¥�d´I�Iº·�¥¾¥�� Y©��I�¨� > �I¹%�_�¥£��8D4�W�7¡C�_¹ > � Ô%ÒKÓIÔ ÝaD4�(£ > � Ô%Ò%ÓIÔ Ý7� Ë ¡ Ô MU¡C�C�7�¥�����7���W���W�(�_�WºS]ËIË<Ì U ëAºm�¤º È �I«¥���d�¥�W­ ý º ö º¥ì��_¢(£¥�~�I�­�Öp¾GÃs�_º}ëM�_´,º �4Ý%ès­ ×%Ì è × Ç Ë<Ò%Ò%Ì Ê$º

S]ËIË<Ò U å Ù Ã[�u¡C�_�.�7¡��(�_�M�I�¥£����d�~�]¡ È �I¢d�W«¥¢(�7¡C�d�%�¥�gæ#­ ÓIÔ%Ô ç�­L!�º�ì¼�(�¨¾¥�W�_­����n$N�I¡C�§Ý ×IÔ%Ò ºS]Ë<ÓIÔ U å È �7¢(�W«�¢��7¡��(�¥¹§¢(�(�0�d¡��w¬r�%�L�_�%�ª©¥�d�¥�W£c�I�¥�I¢dÃs���d�uæC­ ÓIÔ%Ô ç�­8!�º�ì¼�d��¾¥�_�W­�����$Â�I¡�� Ø%Ò è%Ý[ºS]Ë<Ó[Ë U å ÈLÎ ����ÐgѵI¥�ª�W�%�¥£��W�¥�_�k¢d�_´I�W¢¢d�(�0�d¡i�_´7�I¢d«��7¡C�I�uæ#­ ÓIÔ%ÔIÌ ­J!�º�ì¼�(�¨¾¥�W�_­����±$Â�I¡��kÝ ×%Ò Ý[ºS]Ë<Ó%Ó U õ º ö «¥�¥Í�­L$N«¥�W¢½º�ÐE�G¡���«¥�cº�ò��'¡C¾º�» ØK×7Ø Ç Ë<Ò%Ò%Ò Ê'ºS]Ë<ÓI× U »¤º�ëM�Y�7£­ ö º�Öp¾KÃ[�_º ý IL$«¥�_¢Éº�Ö®�I�¨¡Wº�Öp¾GÃs�_º Ó7Ì Ç ÓIÔ%ÔKÓ Ê'­ Ó ç Ò%× ºS]Ë<Ó7Ø U »¤º�ëM�Y�7£­�ì¼�d���¨¡¢{w�%�¨Ís�¨¾¥�%���%���W�%�?/¥£¥�W�¥�_�¤¢d�(�0�d¡C�_­ ÓIÔ%Ô%Ô ­ È Ñië�$§­ ý �W���_´7��ºS]Ë<Ó Ý U ö º�Öp«¥�0�¥¢(�d���_¡Â�I¢½ºd­ ö �ÂÑnÖ ÔKÓIÔ è Ç ÓIÔ%ÔKÓ Ê Ô�ËUÓ ºS]Ë<Ó ç U �¤º Ù ¡�«¥�0�c�'¡Â�I¢Éº]­ ö �ÂÑiÖ ÔI×�Ë<Ô Ç Ó7Ô%Ô%× Ê ÔIØ ç�ºS]Ë<Ó è U õ º ö «¥��Í,­ � «¥�(¢d£¥�(�¥¹v���~�I���á¹%�_�¥�W���I¢ χ2 ­ È �3ìrMf� ÎAÈ M Ù õ » õ Ð Ù õ Ð È Ù MIÖ £ � ��Ð È M%è Ò%ÔIØ ºS]Ë<ÓIÌ U õ º ö «¥�¥Í�­L$N«¥�W¢½º�ÐE�¥�¨¡Wº,ò��_¡�¾º�» ØK×7Ø ­ ØK× Ý Ç Ë<Ò%Ò%Ò Ê$ºS]Ë<ÓIÒ U å Ù �Y�I�¨�#¾¤¬r�%� ZH → l+l−bb

�(� Ø º Ë ¬r© −1 �I¬�� Ë èÂ�I��£¤� ÓIÔ £��7¡C�«¥�¨�(�¥¹4� � �s�%�¨¡��W£&�Â�W�W�mÏ�¨�(�%� õ �¨�W�N�(�0£¥�(�¤«¥�%�~�I�¥£.£��(�W¢d�W�'¡C���I�0�'´%�_�G¡��Wºøæ#­��nºG»Â�¥�W«­ ö º � �I�#ÍG«¥�Cò��YÃ%�_�W­ � º È �I¢d���I�_­j�º È ¾��I�}­ Ù º��5�W���I�É­sò¶ºj4�(�¨©KÃ%­sò¶º[ò�«¥¢d¾¥�Y�7���­GÑLº$5�I¹7Ã%­GÑLº Ù ¡C���I«¥�¨�W­ õ ºkRw�I��«¥£¥��­ ÓIÔ%Ô%Ò ­�����¥�I¡��¤Ý Ì ç Ó º

S]ËY×%Ô U å Ù �Y�I�¨�#¾�¬r�%� ZH → e+e−bb�I��£

ZH → µ+µ−bbÖp���s£¥«¥�_¡��(�%�c�(� Ø º Ë ¬r© −1 �I¬nëM«¥�ШР£¥�7¡#�4{M�]¡C¾ª¡C¾��>� ÷ �W�¨�­�5�_¡��W�_¡��%�p�(���sÏE�¥©��7� È �%¢(¢d�(�¨�(�%�¥� �7¡ √

s > Ë º Ò ç õ � ú ºøæ#­%�nº7»5�¥�_«­ö º � �I�#ÍG«¥�Cò��YÃ%�W�_­ � º È �I¢d���I�_­�j�º È ¾¥�I�­ Ù º��5�_�C�I�½­�ò¶º?jA�d��©KÃ%­�ò¶º¥ò�«¥¢(¾��Y�I�¨�­¥ÑLº�$Â�I¹IÃI­ÑLº Ù ¡��C�I«����W­ õ º8Rw�I�¨«¥£���­ Ó7Ô%Ô%Ò ­��Ô� �¥�I¡��§Ý Ì èIç�º

S]ËY×�Ë U å Ù �Y�I�¨�#¾¤¬r�%� ZHÖp�¨�[£¥«��_¡C�d�%�¤�d�§¡�¾¥�

e+e−bbì¼�d���I¢ Ù ¡C�7¡C�pÏ�Öp�¨�W���_¢(�_�_¡C�d�%�[æC­ � º È �I¢d���I�_­j�º È ¾��I�­ Ù º��5�_�C�I�½­,ò¶ºóòc«¥¢(¾¥�W�I���}­�ÑMº�$5�7¹IÃ%­ õ º Rw�I��«�£���­ ÓIÔ%ÔIÒ ­��������I¡C�kÝ ÒI×%Ô º

Ë ç Ó