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One of the cleanest signatures of a heavy Higgs boson in models withvectorlike leptons is $H\to e_4^\pm \ell^\mp \to h\ell^+\ell^-$ which, in twoHiggs doublet model type-II, can even be the dominant decay mode of heavyHiggses. Among the decay modes of the standard model like Higgs boson, $h$, weconsider $b \bar b$ and $\gamma \gamma$ as representative channels with sizableand negligible background, respectively. We obtained new model independentlimits on production cross section for this process from recasting existingexperimental searches and interpret them within the two Higgs doublet model. Inaddition, we show that these limits can be improved by about two orders ofmagnitude with appropriate selection cuts immediately with existing data sets.We also discuss expected sensitivities with integrated luminosity up to 3ab$^{-1}$ and present a brief overview of other channels.

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