The t t-bar 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 dataset corresponds to an integrated luminosity of 5.0 inverse femtobarns collected with the CMS detector at the LHC. An inclusive and three differential measurements of the t t-bar charge asymmetry as a function of rapidity, transverse momentum, and invariant mass of the t t-bar system are presented. The measured inclusive t t-bar 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.
|Titolo:||Inclusive and differential measurements of the tt- charge asymmetry in proton-proton collisions at s=7 TeV|
|Data di pubblicazione:||2012|
|Digital Object Identifier (DOI):||10.1016/j.physletb.2012.09.028|
|Appare nelle tipologie:||1.1 Articolo in rivista|