Probing light charged Higgs bosons in the 2-Higgs doublet model Type-II with vector-like quarks

Abstract

We show how the presence of Vector-Like Quarks (VLQs) with quantum numbers identical to the top-quark ones alongside a Type-II 2-Higgs Doublet Model (2HDM-II) (pseudo)scalar sector can remove the stringent constraint on the mass of the charged Higgs boson H± (of some 580 GeV) emerging in such a scenario from B-physics results. We prove this to be the case for two representations of such VLQs, both a singlet and a doublet one, wherein the the lowest allowed mH± value can be 80 GeV. This is due to cancellations onsetting in b→sγ topologies between VLQ and H± contributions. Furthermore, in order to enable one to probe the regions of, as it were, this `2HDM-II+VLQ' parameter space where this mechanism is most effective, we present several results on production cross sections and decay rates involving a top-quark companion (T) with VLQ nature and the 2HDM-II Higgs bosons, chiefly the H± state, which can then guide the search for both extended Higgs and quark sectors at the Large Hadron Collider (LHC) at CERN. Specifically, we highlight the case of VLQ pair production pp→TT¯ followed by T→H±b decays, where the H± state may in turn decay into τν or tb pairs, depending on whether mH±<mt or mH±>mt, respectively.

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

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