Measurement of the charge asymmetry in top quark pair production in pp collisions at $\sqrt{s}=7\ \mathrm{TeV}$ using the ATLAS detector

Abstract

A measurement of the top-antitop production charge asymmetry A C is presented using data corresponding to an integrated luminosity of 1.04 fb -1 of pp collisions at s = 7 TeV collected by the ATLAS detector at the LHC. Events are selected with a single lepton (electron or muon), missing transverse momentum and at least four jets of which at least one jet is identified as coming from a b-quark. A kinematic fit is used to reconstruct the t t event topology. After background subtraction, a Bayesian unfolding procedure is performed to correct for acceptance and detector effects. The measured value of A C is A C = -0.0190.028 (stat.)0.024 (syst.), consistent with the prediction from the MC@NLO Monte Carlo generator of A C = 0.006 0.002.