Charged Higgs Signals in $t\,\overline{t}\,H$ Searches

Understand

New scalars from an extended Higgs sector could have weak scale masses and still have escaped detection.

• In a Type I Two Higgs Doublet Model, for instance, even the charged Higgs can be lighter than the top quark.
• Because electroweak production of these scalars is modest, the greatest opportunity for their detection might come from rare top decays.
• For mass hierarchies of the type $m_t>m_{H^\pm}>m_{A^0,\,H^0}$, the natural signal can arise from top quark pair production, followed by the decay chain $t \rightarrow b\,H^+$, $H^+ \rightarrow W^{+(*)} \phi^0$, $\phi^0\rightarrow b\overline{b},\,\tau^+\tau^-$, where $\phi^0=A^0,\,H^0$.