Enhanced four-body decays of charged Higgs Bosons into off-shell pseudoscalar Higgs and W± Boson pairs in a lepton-specific 2-Higgs Doublet Model

Abstract

We study the time-honoured decay H±→AW± but for the first time, we do so for the case of both A and W± being off-shell, therefore computing a 1→4 body decay. We show that the corresponding decay rate not only extends the reach of H± searches to small masses of the latter but also that the results of our implementation differ significantly from the yield of the 1→3 body decay over the phase space region in which the latter is normally used. We show the phenomenological relevance of this implementation in the case of the so-called lepton-specific 2-Higgs Doublet Model (2HDM) over the mass region wherein the aforementioned 1→4 body decay can dominate just beyond the top (anti)quark mass. This mass region is accessible in the lepton-specific 2HDM as the Yukawa couplings are such that limits from b→sγ and τ→μντνμ¯ observables on MH± are rather mild. However, we emphasise that similar effects may occur in other 2HDM types, as the W±H∓A vertex is 2HDM type independent.

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ORCID for Stefano Moretti: orcid.org/0000-0002-8601-7246

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