Production of heavy Higgs bosons and decay into top quarks at the LHC. II: Top-quark polarization and spin correlation effects

摘要

We analyze, within several parameter scenarios of type-II two-Higgs doubletextensions of the standard model, the impact of heavy neutral Higgs-bosonresonances on top-quark pair production and their subsequent decay todileptonic final states at the LHC (13 TeV). In particular, we investigate theeffects of heavy Higgs bosons on top-spin observables, that is, thelongitudinal top-quark polarization and top-quark spin correlations. We takeinto account NLO QCD as well as weak interaction corrections and show thattop-spin observables, if evaluated in judiciously chosen top-quark pairinvariant mass bins, can significantly enhance the sensitivity to heavy Higgsresonances in top-quark pair events.