Effective axial-vector coupling of the gluon and top-quark charge asymmetry at the LHC

We study the top quark charge asymmetry induced by an effective axial-vector coupling of the gluon at the LHC experiments. We showed that rapidity cut-dependent asymmetries are more sensitive to the new physics than the independent ones. We also study the dependence of the asymmetries and variations of the total tt-bar cross sections on the invariant mass of the tt-bar system and show that it would be necessary to measure those quantities as functions of mtt at the LHC. If this is done, in the context of the considered new physics scenario, the 7 TeV LHC has enough sensitivity either to confirm the Tevatron top charge asymmetry anomaly or to rule it out. In the latter case the LHC will be able to put stringent constraint on the new physics scale Λ in this framework. (authors)