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

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

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,...

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Bibliographic Details
Main Authors: 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
Other Authors: Massachusetts Institute of Technology. Department of Physics
Format: Article
Language:en_US
Published: Springer-Verlag 2014
Online Access:http://hdl.handle.net/1721.1/88608
https://orcid.org/0000-0002-3831-9071
https://orcid.org/0000-0003-3106-4894
https://orcid.org/0000-0001-6332-5839
https://orcid.org/0000-0001-8983-2169
https://orcid.org/0000-0002-1260-777X
https://orcid.org/0000-0002-6047-4211
https://orcid.org/0000-0002-7945-005X
https://orcid.org/0000-0003-3681-0649
https://orcid.org/0000-0002-9418-6656
https://orcid.org/0000-0003-1486-606X
https://orcid.org/0000-0003-2593-7767
https://orcid.org/0000-0001-9236-6621
https://orcid.org/0000-0002-0869-5631
https://orcid.org/0000-0002-1136-6900
Description
Summary: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.

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