Combined search for the quarks of a sequential fourth generation

S. Chatrchyan; M. Besancon; S. Choudhury; M. Dejardin; D. Denegri; B. Fabbro; J.L. Faure; F. Ferri; S. Ganjour; A. Givernaud; P. Gras; G. Hamel de Monchenault; P. Jarry; E. Locci; J. Malcles; L. Millischer; A. Nayak; J. Rander; A. Rosowsky; I. Shreyber; M. Titov; S. Baffioni; F. Beaudette; L. Benhabib; L. Bianchini; M. Bluj; C. Broutin; P. Busson; C. Charlot; N. Daci; T. Dahms; L. Dobrzynski; R. Granier de Cassagnac; M. Haguenauer; P. Mine; C. Mironov; I.N. Naranjo; M. Nguyen; C. Ochando; P. Paganini; D. Sabes; R. Salerno; Y. Sirois; C. Veelken; A. Zabi; J.-L. Agram; J. Andrea; D. Bloch; D. Bodin; J.-M. Brom; M. Cardaci; E.C. Chabert; C. Collard; E. Conte; F. Drouhin; C. Ferro; J.-C. Fontaine; D. Gele; U. Goerlach; P. Juillot; A.-C. Le Bihan; P. Van Hove; F. Fassi; D. Mercier; S. Beauceron; N. Beaupere; O. Bondu; G. Boudoul; J. Chasserat; R. Chierici; D. Contardo; P. Depasse; H. El Mamouni; J. Fay; S. Gascon; M. Gouzevitch; B. Ille; T. Kurca; M. Lethuillier; L. Mirabito; S. Perries; V. Sordini; Y. Tschudi; P. Verdier; S. Viret

HAL : in2p3-00730454, version 1

arXiv : 1209.1062

DOI : 10.1103/PhysRevD.86.112003

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Combined search for the quarks of a sequential fourth generation
Chatrchyan S., Besancon M., Choudhury S., Dejardin M., Denegri D. et al
Physical Review D 86 (2012) 112003 - http://hal.in2p3.fr/in2p3-00730454

Thème(s) :

Physique/Physique des Hautes Energies - Expérience

Titre :

Combined search for the quarks of a sequential fourth generation

Auteur :

S. Chatrchyan, M. Besancon¹, S. Choudhury¹, M. Dejardin¹, D. Denegri¹, B. Fabbro¹, J.L. Faure¹, F. Ferri¹, S. Ganjour¹, A. Givernaud¹, P. Gras¹, G. Hamel de Monchenault¹, P. Jarry¹, E. Locci¹, J. Malcles¹, L. Millischer¹, A. Nayak¹, J. Rander¹, A. Rosowsky¹, I. Shreyber¹, M. Titov¹, S. Baffioni², F. Beaudette², L. Benhabib², L. Bianchini², M. Bluj², C. Broutin², P. Busson², C. Charlot², N. Daci², T. Dahms², L. Dobrzynski², R. Granier de Cassagnac², M. Haguenauer², P. Mine², C. Mironov², I.N. Naranjo², M. Nguyen², C. Ochando², P. Paganini², D. Sabes², R. Salerno², Y. Sirois², C. Veelken², A. Zabi², J.-L. Agram³, J. Andrea³, D. Bloch³, D. Bodin³, J.-M. Brom³, M. Cardaci³, E.C. Chabert³, C. Collard³, E. Conte³, F. Drouhin³, C. Ferro³, J.-C. Fontaine³, D. Gele³, U. Goerlach³, P. Juillot³, A.-C. Le Bihan³, P. Van Hove³, F. Fassi⁴, D. Mercier⁴, S. Beauceron⁵, N. Beaupere⁵, O. Bondu⁵, G. Boudoul⁵, J. Chasserat⁵, R. Chierici⁵, D. Contardo⁵, P. Depasse⁵, H. El Mamouni⁵, J. Fay⁵, S. Gascon⁵, M. Gouzevitch⁵, B. Ille⁵, T. Kurca⁵, M. Lethuillier⁵, L. Mirabito⁵, S. Perries⁵, V. Sordini⁵, Y. Tschudi⁵, P. Verdier⁵, S. Viret⁵

Laboratoire :

1 :	IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers (ex DAPNIA)

CEA : DSM/IRFU

France

2 :	LLR - Laboratoire Leprince-Ringuet

http://polywww.in2p3.fr/

CNRS : UMR7638 – IN2P3 – Polytechnique - X

Route de Saclay - 91128 Palaiseau Cedex

France

3 :	IPHC - Institut Pluridisciplinaire Hubert Curien

CNRS : UMR7178 – Université de Strasbourg

France

4 :	CC IN2P3 - Centre de Calcul de l'inst. national de phy. nucléaire et de phy. des particules

http://cc.in2p3.fr/

CNRS : USR6402 – IN2P3

12-14, boulevard Niels Bohr 69622 VILLEURBANNE CEDEX

France

5 :	IPNL - Institut de Physique Nucléaire de Lyon

http://www.ipnl.in2p3.fr/

CNRS : UMR5822 – IN2P3 – Université Claude Bernard - Lyon I

France

Résumé :

Results are presented from a search for a fourth generation of quarks produced singly or in pairs in a data set corresponding to an integrated luminosity of 5 inverse femtobarns recorded by the CMS experiment at the LHC in 2011. A novel strategy has been developed for a combined search for quarks of the up- and down-type in decay channels with at least one isolated muon or electron. Limits on the mass of the fourth-generation quarks and the relevant CKM matrix elements are derived in the context of a simple extension of the standard model with a sequential fourth generation of fermions. The existence of mass-degenerate fourth-generation quarks with masses below 685 GeV is excluded at 95% confidence level for minimal off-diagonal mixing between the third- and the fourth-generation quarks. With a mass difference of 25 GeV between the quark masses, the obtained limit on the masses of the fourth-generation quarks shifts by about +/- 20 GeV. This result significantly reduces the allowed parameter space for a fourth generation of fermions.

Collaboration/Projet :

CMS

Type de publication :

Articles dans des revues avec comité de lecture

Date de publication
ou d'écriture :

2012

Nom du périodique :

Physical Review D (Phys. Rev. D)
Publisher	American Physical Society
ISSN	1550-7998 (eISSN : 1550-2368)

Volume :

Page/Article :

112003

Commentaire :

Submitted to Phys. Rev. D, see paper for full list of authors

Lien vers le texte intégral :

http://fr.arXiv.org/abs/1209.1062


in2p3-00730454, version 1
http://hal.in2p3.fr/in2p3-00730454
oai:hal.in2p3.fr:in2p3-00730454
Contributeur : Dominique Girod <>
Soumis le : Lundi 10 Septembre 2012, 12:16:12
Dernière modification le : Jeudi 13 Décembre 2012, 09:03:03