Search for anomalous top–gluon couplings at LHC revisited

Abstract

Through top-quark pair productions at LHC, we study possible effects of\nnonstandard top-gluon couplings yielded by SU(3)xSU(2)xU(1) invariant\ndimension-6 effective operators. We calculate the total cross section and also\nsome distributions for p p -> t tbar X as functions of two anomalous-coupling\nparameters, i.e., the chromoelectric and chromomagnetic moments of the top,\nwhich are constrained by the total cross section sigma(p pbar -> t tbar X)\nmeasured at Tevatron. We find that LHC might give us some chances to observe\nsizable effects induced by those new couplings.\n