The ttbar 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 inverse-femtobarns, collected by the CMS experiment at the LHC. The top-antitop 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 C = -0.010 +/- 0.017 (stat.) +/- 0.008 (syst.) and A lep 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 top-antitop system. All measurements are consistent with the expectations of the standard model.

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

CAVALLO, Nicola;FABOZZI, FRANCESCO;
2014

Abstract

The ttbar 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 inverse-femtobarns, collected by the CMS experiment at the LHC. The top-antitop 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 C = -0.010 +/- 0.017 (stat.) +/- 0.008 (syst.) and A lep 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 top-antitop system. All measurements are consistent with the expectations of the standard model.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11563/94925
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