Measurement of the charge asymmetry in top quark pair production in pp collisions at ... formula ... using the ATLAS detector

摘要

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  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  event topology. After background subtraction, a Bayesian unfolding procedure is performed to correct for acceptance and detector effects. The measured value of AC is , 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.