Measurement of the charge asymmetry in top quark pair production in pp collisions at √(s)=7 TeV using the ATLAS detector

A measurement of the top-antitop production charge asymmetry AC 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 anti t event topology. After background subtraction, a Bayesian unfolding procedure is performed to correct for acceptance and detector effects. The measured value of AC is AC= -0.019 ±0.028 (stat.) ±0.024 (syst.), consistent with the prediction from the MC rate at NLO Monte Carlo generator of AC =0.006 ±0.002. Measurements of AC in two ranges of invariant mass of the top-antitop pair are also shown. (orig.)