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Measurements of the t[bar over t] charge asymmetry using the dilepton decay channel in pp collisions at √s = 7 TeV

Author(s)
Apyan, Aram; Busza, Wit; Cali, Ivan Amos; Chan, M.; Di Matteo, Leonardo; Gomez-Ceballos, Guillelmo; Goncharov, Maxim; Gulhan, Doga Can; Klute, Markus; Lai, Yue Shi; Ma, Teng; Paus, Christoph M. E.; Ralph, Duncan Kelley; Stephans, George S. F.; Velicanu, Dragos Alexandru; Veverka, Jan; Wyslouch, Boleslaw; Yoon, A. S.; Zanetti, Marco; Barbieri, Richard Alexander; Dutta, Valentina; Lee, Yen-Jie; Luckey Jr, P David; Roland, Christof E; Sumorok, Konstanty C; Yang, Mingming; Wyslouch, Victoria; Bauer, Gerry P; Levin, Andrew Michael; Roland, Gunther M; Stoeckli, Fabian; ... Show more Show less
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Abstract
The t[bar over t] charge asymmetry in proton-proton collisions at √s = 7 TeV is measured using the dilepton decay channel (ee, eμ, or μμ). The data correspond to a total integrated luminosity of 5.0 fb[superscript −1], collected by the CMS experiment at the LHC. The tt 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 A [subscript C] = −0.010 ± 0.017 (stat.) ± 0.008 (syst.) and A[lep over C] = 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[bar over t] system. All measurements are consistent with the expectations of the standard model.
Date issued
2014-04
URI
http://hdl.handle.net/1721.1/88608
Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science; Massachusetts Institute of Technology. School of Science
Journal
Journal of High Energy Physics
Publisher
Springer-Verlag
Citation
Chatrchyan, S., V. Khachatryan, A. M. Sirunyan, A. Tumasyan, W. Adam, T. Bergauer, M. Dragicevic, et al. “Measurements of the t[bar over t] charge asymmetry using the dilepton decay channel in pp collisions at √s = 7 TeV.” J. High Energ. Phys. 2014, no. 4 (April 2014). doi:10.1007/jhep04(2014)191.
Version: Final published version
ISSN
1029-8479
1126-6708

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