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Many extensions of the Standard Model contain (pseudo)scalar bosons withmasses in the TeV range. At hadron colliders, such particles wouldpredominantly be produced in gluon fusion and would decay into top quark pairfinal sates, a signal that interferes with the large QCD background $gg \tot\bar t$. This phenomenon is of interest for searches for by the LHCexperiments. Here, we consider the signal and background interference in thisprocess and study it in various benchmark scenarios, including models withextra singlet (pseudo)scalar resonances, two-Higgs doublet models, and theminimal supersymmetric extension of the SM with parameters chosen to obtain themeasured light Higgs mass (the hMSSM). We allow for the possible exchanges ofbeyond the SM vector-like particles as well as scalar quarks. We calculate thepossible interference effects including realistic estimates of the attainabledetection efficiency and mass resolution. Studies of our benchmark scenariosindicate that searches with an LHC detector could permit the observation of the$t\bar t$ final states or constrain significantly large regions of theparameter spaces of the benchmark scenarios.

Interference Effects in $t{\bar t}$ Production at the LHC as a Window on New Physics