Light Higgs bosons in two-Higgs-doublet models

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Abstract

We explore the possibilities in two-Higgs-doublet models of type I and type II for Higgs states with mass below about 60 GeV, i.e. less than half of the $\ensuremath{\sim}125\text{ }\text{ }\mathrm{GeV}$ mass of the observed SM-like Higgs boson. We identify the latter as either the lighter or the heavier $CP$-even state, $h$ or $H$, and employ scans of the two-Higgs-doublet model parameter space taking into account all relevant theoretical and experimental constraints, including the most up-to-date Higgs signal strength measurements. We find that, in both type I and type II models, such light Higgs states are phenomenologically viable and can lead to interesting signatures. Part of the relevant parameter space may be testable with the existing 8 TeV LHC data, e.g. by looking for direct production of the light state via $gg$ fusion or $b\overline{b}$ associated production using its ${\ensuremath{\tau}}^{+}{\ensuremath{\tau}}^{\ensuremath{-}}$ and ${\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$ decays at low invariant mass.

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