New constraints and discovery potential for Higgs to Higgs cascade decays through vectorlike leptons

Understand

One of the cleanest signatures of a heavy Higgs boson in models with vectorlike leptons is $H\to e_4^\pm \ell^\mp \to h\ell^+\ell^-$ which, in two Higgs doublet model type-II, can even be the dominant decay mode of heavy Higgses.

• Among the decay modes of the standard model like Higgs boson, $h$, we consider $b \bar b$ and $\gamma \gamma$ as representative channels with sizable and negligible background, respectively.
• We obtained new model independent limits on production cross section for this process from recasting existing experimental searches and interpret them within the two Higgs doublet model.
• In addition, we show that these limits can be improved by about two orders of magnitude with appropriate selection cuts immediately with existing data sets.