Measurements of the tt¯ charge asymmetry using the dilepton decay channel in pp collisions at √s = 7 TeV

Authors

• CMS collaboration, CMS collaboration
• S. Chatrchyan, Yerevan Physics Institute
• Ekaterina Avdeeva, University of Nebraska-LincolnFollow
• Kenneth A. Bloom, University of Nebraska - LincolnFollow
• S. Bose, University of Nebraska - LincolnFollow
• Daniel R. Claes, University of Nebraska-LincolnFollow
• Aaron Dominguez, University of Nebraska-LincolnFollow
• Rebeca Gonzalez Suarez, University of Nebraska-LincolnFollow
• J. Keller, University of Nebraska-LincolnFollow
• D. Knowlton, University of Nebraska-LincolnFollow
• Ilya Kravchenko, University of Nebraska-LincolnFollow
• J. Lazo-Flores, University of Nebraska-LincolnFollow
• S. Malik, University of Nebraska-LincolnFollow
• F. Meier, University of Nebraska-LincolnFollow
• Gregory R. Snow, University of Nebraska-LincolnFollow

Document Type

Article

Date of this Version

4-30-2014

Citation

JHEP04(2014)191; doi:10.1007/JHEP04(2014)191

Comments

Copyright © 2014 CERN, issued under CC license; published by Springer.

Abstract

The tt¯ charge asymmetry in proton-proton collisions at √s = 7 TeV is measuredusing the dilepton decay channel (ee, eμ, or μμ). The data correspond to a total integrated luminosity of 5.0 fb⁻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_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 tt¯ system. All measurements are consistent with the expectations of the standard model.