Distinctive Heavy Higgs Decays

For a heavy Higgs boson above the $t\bar{t}$ threshold we consider three decay modes that could compete with decay to $t\bar{t}$, even in the alignment limit of a 2-Higgs doublet model. The decays $H\to AZ$, $Z^{\mathrm{\prime }}{Z}^{\mathrm{\prime }}$ and ${\tau }^{\mathrm{\prime }}{\tau }^{\mathrm{\prime }}$ show that heavy Higgs decays can be an effective probe of new physics both within and beyond this model.