Measurement of the charge asymmetry in top quark pair production in pp collisions at 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 $$\sqrt{s} = 7$$ 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 $$t\bar{t}$$ event topology. After background subtraction, a Bayesian unfolding procedure is performed to correct for acceptance and detector effects. The measured value of AC is $$A_{C}= -0.019 \pm0.028 \ (\mathrm{stat}.) \pm0.024 \ (\mathrm{syst.})$$, consistent with the prediction from the MC@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.