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We present the azimuthal correlations in the decay products of the top quarkpair created in the process $gg \to t \tbar \to b \bbar \wplus \wminus$calculated in leading-order QCD. We then discuss deviations in thisdistribution that could arise from New Physics contributions, focusing, inparticular, on the case of a new heavy scalar coupling to the top quark andproduced via the gluon fusion mechanism. Within this scenario we consider twocases: one in which the top quark is the only particle with a significantcoupling to the scalar and another in which there are additional heavy fermionsthat modify the effective coupling of the scalar to gluons. We discuss theeffects on the overall cross section and azimuthal correlations of the topquark decay products, with particular emphasis on the effect of interferencebetween the QCD and New Physics contributions and on the existence ofCP-nonconserving couplings.

Azimuthal Correlations in Top Pair Decays and The Effects of New Heavy Scalars