Measurements of the t t-bar charge asymmetry using the dilepton decay channel in pp collisions at sqrt(s) = 7 TeV

S. Chatrchyan , S. Baffioni (1) , F. Beaudette (1) , P. Busson (1) , C. Charlot (1) , N. Daci (1) , T. Dahms (1) , M. Dalchenko (1) , L. Dobrzynski (1) , A. Florent (1) , R. Granier de Cassagnac (1) , P. Mine (1) , C. Mironov (1) , I.N. Naranjo (1) , M. Nguyen (1) , C. Ochando (1) , P. Paganini (1) , D. Sabes (1) , R. Salerno (1) , J.B. Sauvan (1) , Y. Sirois (1) , C. Veelken (1) , Y. Yilmaz (1) , A. Zabi (1) , J.-L. Agram (2) , J. Andrea (2) , D. Bloch (2) , J.-M. Brom (2) , E.C. Chabert (2) , C. Collard (2) , E. Conte (2) , F. Drouhin (2) , J.-C. Fontaine (2) , D. Gele (2) , U. Goerlach (2) , C. Goetzmann (2) , P. Juillot (2) , A.-C. Le Bihan (2) , P. van Hove (2) , S. Gadrat (3) , S. Beauceron (4) , N. Beaupere (4) , G. Boudoul (4) , S. Brochet (4) , J. Chasserat (4) , R. Chierici (4) , D. Contardo (4) , P. Depasse (4) , H. El Mamouni (4) , J. Fan (4) , J. Fay (4) , S. Gascon (4) , M. Gouzevitch (4) , B. Ille (4) , T. Kurca (4) , M. Lethuillier (4) , L. Mirabito (4) , S. Perries (4) , J.D. Ruiz Alvarez (4) , L. Sgandurra (4) , V. Sordini (4) , M. Vander Donckt (4) , P. Verdier (4) , S. Viret (4) , H. Xiao (4)

1 LLR - Laboratoire Leprince-Ringuet
2 IPHC - Institut Pluridisciplinaire Hubert Curien
3 CC-IN2P3 - Centre de Calcul de l'IN2P3
4 IPNL - Institut de Physique Nucléaire de Lyon

The t t-bar charge asymmetry in proton-proton collisions at sqrt(s)=7 TeV is measured using the dilepton decay channel (ee, e mu, or mu mu). The data correspond to a total integrated luminosity of 5.0 inverse femtobarns, collected by the CMS experiment at the LHC. The t t-bar and lepton charge asymmetries, defined as the differences in absolute values of the rapidities between the reconstructed top quarks and antiquarks and of the pseudorapidities between the positive and negative leptons, respectively, are measured to be Ac = -0.010 +/- 0.017 (stat.) +/- 0.008 (syst.) and Ac[lep] = 0.009 +/- 0.010 (stat.) +/- 0.006 (syst). The lepton charge asymmetry is also measured as a function of the invariant mass, rapidity, and transverse momentum of the t t-bar system. All measurements are consistent with the expectations of the standard model.

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

S. Chatrchyan, S. Baffioni, F. Beaudette, P. Busson, C. Charlot, et al.. Measurements of the t t-bar charge asymmetry using the dilepton decay channel in pp collisions at sqrt(s) = 7 TeV. Journal of High Energy Physics, 2014, 04(2014), pp.191. ⟨10.1007/JHEP04(2014)191⟩. ⟨in2p3-00948260⟩