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Measurements of the $\mathrm{t}\overline{\mathrm{t}}$ charge asymmetry using the dilepton decay channel in pp collisions at $\sqrt{s}$ = 7 TeV


CMS Collaboration; Canelli, M F; Chiochia, V; Kilminster, B; Robmann, P; et al (2014). Measurements of the $\mathrm{t}\overline{\mathrm{t}}$ charge asymmetry using the dilepton decay channel in pp collisions at $\sqrt{s}$ = 7 TeV. Journal of High Energy Physics:191.

Abstract

The $\mathrm{t}\overline{\mathrm{t}}$ 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 /pm 0.017 (stat.) /pm 0.008 (syst.) and $A_{\mathrm{C}}^{\mathrm{lep}}$ = 0.009 /pm 0.010 (stat.) /pm- 0.006 (syst). The lepton charge asymmetry is also measured as a function of the invariant mass, rapidity, and transverse momentum of the $\mathrm{t}\overline{\mathrm{t}}$ system. All measurements are consistent with the expectations of the standard model.

Abstract

The $\mathrm{t}\overline{\mathrm{t}}$ 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 /pm 0.017 (stat.) /pm 0.008 (syst.) and $A_{\mathrm{C}}^{\mathrm{lep}}$ = 0.009 /pm 0.010 (stat.) /pm- 0.006 (syst). The lepton charge asymmetry is also measured as a function of the invariant mass, rapidity, and transverse momentum of the $\mathrm{t}\overline{\mathrm{t}}$ system. All measurements are consistent with the expectations of the standard model.

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Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2014
Deposited On:24 Feb 2015 14:03
Last Modified:14 Feb 2018 23:17
Publisher:Springer
ISSN:1029-8479
OA Status:Gold
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1007/JHEP04(2014)191

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