Measurement of top quark charge asymmetry at the LHC using the ATLAS detector

Summary. — Charge asymmetry in top quark pair production at the LHC can be an important window on new physics, as in some theories beyond the Standard Model this asymmetry is significantly enhanced with respect to Standard Model prediction. The measurement performed by the ATLAS Collaboration with 2011 pp collision data corresponding to an integrated luminosity of 0.70 fb−1 is presented. The analysis has been performed selecting signal events in the semileptonic channel. A kinematic likelihood has then been used to reconstruct the top quark pair event topology. After background subtraction, a Bayesian unfolding procedure has been applied to correct for acceptance and detector effects. The final result is shown as well as a comparison between measured and predicted asymmetry.