Inclusive and differential measurements of the tt̅ charge asymmetry in proton–proton collisions at √s= 7 TeV

Authors

• CMS Collaboration
• Ekaterina Avdeeva, University of Nebraska-LincolnFollow
• Kenneth A. Bloom, University of Nebraska-LincolnFollow
• S. Bose, University of Nebraska-LincolnFollow
• J. Butt, University of Nebraska-Lincoln
• Daniel R. Claes, University of Nebraska-LincolnFollow
• Aaron Dominguez, University of Nebraska-LincolnFollow
• Michael Eads, University of Nebraska-LincolnFollow
• J. Keller, University of Nebraska-LincolnFollow
• Ilya Kravchenko, University of Nebraska-LincolnFollow
• J. Lazo-Flores, University of Nebraska-LincolnFollow
• H. Malbouisson, University of Nebraska-Lincoln
• Sudhir Malik, University of Nebraska-LincolnFollow
• Gregory Snow, University of Nebraska-LincolnFollow

Document Type

Article

Date of this Version

2012

Citation

Physics Letters B 717 (2012) 129–150; http://dx.doi.org/10.1016/j.physletb.2012.09.028

Abstract

The tt̅ charge asymmetry is measured in events containing a charged lepton (electron or muon) and at least four jets, one of which is identified as originating from b-quark hadronization. The analyzed data set corresponds to an integrated luminosity of 5.0 fb⁻¹ collected with the CMS detector at the LHC. An inclusive and three differential measurements of the tt̅ charge asymmetry as a function of rapidity, transverse momentum, and invariant mass of the tt̅ system are presented. The measured inclusive tt̅ charge asymmetry is A_C = 0.004 ± 0.010 (stat.) ± 0.011 (syst.). This result and the three differential measurements are consistent with zero asymmetry as well as with the predictions of the standard model.