Search

We analyze the impact of effective axial-vector coupling of the gluon on spin polarization observables in tt pair production at the LHC. Working at leading order in QCD, we compute the tt spin correlation and left-right spin asymmetry coefficients in the helicity basis in the laboratory frame as functions of the new physics scale A associated with this coupling. We found that the tt invariant mass dependent asymmetries are more sensitive to the scale A than the corresponding inclusive ones, in particular when suitable cuts selecting high tt invariant mass regions are imposed. In the context of this scenario, we show that the LHC has potential either to confirm or to rule out the Tevatron forward-backward top asymmetry anomaly by analyzing the tt spin correlation and left-right polarization asymmetries. On the other hand, stringent lower bound on the new physics scale A can be set in this scenario if no significant deviations from the standard model predictions for those observables will be measured. [ABSTRACT FROM AUTHOR]