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Article Dans Une Revue European Physical Journal C: Particles and Fields Année : 2012

A search for ttbar resonances with the ATLAS detector in 2.05 fb^-1 of proton-proton collisions at sqrt(s) = 7 TeV

G. Aad , S. Albrand (1) , Q. Buat (1) , B. Clement (1) , J. Collot (1) , S. Crépé-Renaudin (1) , B. Dechenaux (1) , T. Delemontex (1) , P.A. Delsart (1) , M.H. Genest (1) , J.Y. Hostachy (1) , E. Laisne (1) , F. Ledroit-Guillon (1) , A. Lleres (1) , A. Lucotte (1) , F. Malek (1) , F. Polci (1) , J. Stark (1) , X. Sun (1) , B. Trocmé (1) , J. Wang (1) , C. Weydert (1) , C. Biscarat (2) , E. Cogneras (2) , G. Rahal (2) , L. Aperio Bella (3) , B. Aubert (3) , N. Berger (3) , J. Colas (3) , M. Delmastro (3) , L. Di Ciaccio (3) , T.K.O. Doan (3) , S. Elles (3) , C. Goy (3) , L. Helary (3) , T. Hryn'Ova (3) , A. Jérémie (3) , S. Jézéquel (3) , M. Kataoka (3) , J. Labbe (3) , R. Lafaye (3) , J. Leveque (3) , V.P. Lombardo (3) , N. Massol (3) , P. Perrodo (3) , E. Petit (3) , H. Przysiezniak (3) , E. Richter-Was (3) , G. Sauvage (3) , E. Sauvan (3) , M. Schwoerer (3) , T. Todorov (3) , D. Tsionou (3) , I. Wingerter-Seez (3) , R. Zitoun (3) , Y. Zolnierowski (3) , S. Abdel Khalek (4) , H. Abreu (4) , N. Andari (4) , C. Arnault (4) , E. Augé (4) , P. Barrillon (4) , M. Benoit (4) , S. Binet (4) , C. Bourdarios (4) , C. de La Taille (4) , J.B. de Vivie de Regie (4) , L. Duflot (4) , M. Escalier (4) , L. Fayard (4) , D. Fournier (4) , J.-F. Grivaz (4) , S. Henrot-Versillé (4) , J. Hrivnac (4) , L. Iconomidou-Fayard (4) , J. Idarraga (4) , M. Kado (4) , N. Lorenzo Martinez (4) , A. Lounis (4) , N. Makovec (4) , P. Matricon (4) , F. Niedercorn (4) , L. Poggioli (4) , P. Puzo (4) , A. Renaud (4) , D. Rousseau (4) , G. Rybkin (4) , J.B. Sauvan (4) , J. Schaarschmidt (4) , A.C. Schaffer (4) , E. Scifo (4) , L. Serin (4) , S. Simion (4) , R. Tanaka (4) , M. Teinturier (4) , J.J. Veillet (4) , I. Vukotic (4) , F. Wicek (4) , D. Zerwas (4) , Zhiqing Zhang (4) , S. Aoun (5) , C. P. Bee (5) , C. Bertella (5) , N. Bousson (5) , J. C. Clémens (5) , Y. Coadou (5) , F. Djama (5) , F. Etienne (5) , L. Feligioni (5) , D. Hoffmann (5) , F. Hubaut (5) , E. B. F. G. Knoops (5) , E. Le Guirriec (5) , B. Li (5) , J. Maurer (5) , E. Monnier (5) , J. Odier (5) , P. Pralavorio (5) , Z. Qian (5) , A. Rozanov (5) , M. Talby (5) , N. Tannoury (5) , S. Tisserant (5) , J. Toth (5) , F. Touchard (5) , L. Vacavant (5) , D. Boumediene (6) , Emmanuel Busato (6) , D. Calvet (6) , S. Calvet (6) , Reina Coromoto Camacho Toro (6) , Diane Cinca (7) , J. Donini (6) , R. Febbraro (6) , N. Ghodbane (6) , C. Guicheney (6) , H. Liao (6) , D. Pallin (6) , Daniela Paredes Hernández (6) , F. Podlyski (6) , C. Santoni (6) , F. Vazeille (6)
G. Aad
E. Cogneras
N. Berger
C. Goy
T. Hryn'Ova
E. Augé
D. Rousseau
Zhiqing Zhang
  • Fonction : Auteur
  • PersonId : 829631
Y. Coadou
S. Calvet
Diane Cinca

Résumé

A search for top quark pair resonances in final states containing at least one electron or muon has been performed with the ATLAS experiment at the CERN Large Hadron Collider. The search uses a data sample corresponding to an integrated luminosity of 2.05 fb^-1, which was recorded in 2011 at a proton-proton centre-of-mass energy of 7 TeV. No evidence for a resonance is found and limits are set on the production cross-section times branching ratio to ttbar for narrow and wide resonances. For narrow Z' bosons, the observed 95% credibility level limits range from 9.3 pb to 0.95 pb for masses in the range of m_Z' = 500 GeV to m_Z' = 1300 GeV. The corresponding excluded mass region for a leptophobic topcolour Z' boson (Kaluza-Klein gluon excitation in the Randall-Sundrum model) is m_Z' < 880 GeV (m_{g_KK} < 1130 GeV).

Dates et versions

in2p3-00701288 , version 1 (25-05-2012)

Identifiants

Citer

G. Aad, S. Albrand, Q. Buat, B. Clement, J. Collot, et al.. A search for ttbar resonances with the ATLAS detector in 2.05 fb^-1 of proton-proton collisions at sqrt(s) = 7 TeV. European Physical Journal C: Particles and Fields, 2012, 72, pp.2083. ⟨10.1140/epjc/s10052-012-2083-1⟩. ⟨in2p3-00701288⟩
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