Measurement of the charge asymmetry in top quark pair production in pp collisions at sqrt(s) = 7 TeV using the ATLAS detector

G. Aad , S. Albrand (1) , M.L. Andrieux (1) , Q. Buat (1) , B. Clement (1) , J. Collot (1) , S. Crépé-Renaudin (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) , P. Martin (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) , D. Boumediene (3) , Emmanuel Busato (3) , D. Calvet (3) , S. Calvet (3) , Reina Coromoto Camacho Toro (3) , Diane Cinca (3) , J. Donini (3) , R. Febbraro (3) , C. Guicheney (3) , H. Liao (3) , D. Pallin (3) , F. Podlyski (3) , C. Santoni (3) , L. P. Says (3) , F. Vazeille (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) , L. Aperio Bella (5) , B. Aubert (5) , N. Berger (5) , J. Colas , M. Delmastro (5) , L. Di Ciaccio (5) , T.K.O. Doan (5) , S. Elles (5) , C. Goy (5) , L. Helary (5) , T. Hryn'Ova (5) , A. Jérémie (5) , S. Jézéquel (5) , M. Kataoka (5) , J. Labbe (5) , R. Lafaye (5) , J. Leveque (5) , V.P. Lombardo (5) , N. Massol (5) , P. Perrodo (5) , E. Petit (5) , H. Przysiezniak (5) , E. Richter-Was (5) , G. Sauvage (5) , E. Sauvan (5) , M. Schwoerer (5) , T. Todorov (5) , D. Tsionou (5) , I. Wingerter-Seez (5) , R. Zitoun (5) , Y. Zolnierowski (5) , S. Aoun (6) , C. P. Bee (6) , C. Benchouk (6) , C. Bertella (6) , N. Bousson (6) , J. C. Clémens (6) , Y. Coadou (6) , F. Djama (6) , F. Etienne (6) , L. Feligioni (6) , F. Henry-Couannier (6) , D. Hoffmann (6) , F. Hubaut (6) , E. B. F. G. Knoops (6) , E. Le Guirriec (6) , B. Li (6) , J. Maurer (6) , E. Monnier (6) , J. Odier (6) , P. Pralavorio (6) , Z. Qian (6) , A. Rozanov (6) , M. Talby (6) , N. Tannoury (6) , S. Tisserant (6) , J. Toth (6) , F. Touchard (6) , L. Vacavant (6)

1 LPSC - Laboratoire de Physique Subatomique et de Cosmologie
2 CC-IN2P3 - Centre de Calcul de l'IN2P3
3 LPC - Laboratoire de Physique Corpusculaire - Clermont-Ferrand
4 LAL - Laboratoire de l'Accélérateur Linéaire
5 LAPP - Laboratoire d'Annecy de Physique des Particules
6 CPPM - Centre de Physique des Particules de Marseille

A measurement of the top-antitop production charge asymmetry A_C is presented using data corresponding to an integrated luminosity of 1.04 fb^-1 of pp collisions at sqrt(s) = 7 TeV collected by the ATLAS detector at the LHC. Events are selected with a single lepton (electron or muon), missing transverse momentum and at least four jets of which at least one jet is identified as coming from a b-quark. A kinematic fit is used to reconstruct the ttbar event topology. After background subtraction, a Bayesian unfolding procedure is performed to correct for acceptance and detector effects. The measured value of A_C is A_C = -0.018 +/- 0.028 (stat.) +/- 0.023 (syst.), consistent with the prediction from the MC@NLO Monte Carlo generator of A_C = 0.006 +/- 0.002. Measurements of A_C in two ranges of invariant mass of the top-antitop pair is also shown.

Domaines: Physique des Hautes Energies - Expérience [hep-ex]

G. Aad, S. Albrand, M.L. Andrieux, Q. Buat, B. Clement, et al.. Measurement of the charge asymmetry in top quark pair production in pp collisions at sqrt(s) = 7 TeV using the ATLAS detector. European Physical Journal C: Particles and Fields, 2012, 72, pp.2039. ⟨10.1140/epjc/s10052-012-2039-5⟩. ⟨in2p3-00681364⟩