Light Higgs bosons in Two-Higgs-Doublet Models

Abstract

We explore the possibilities in two-Higgs-doublet models (2HDMs) of Type I and Type II for Higgs states with mass below about 60 GeV, i.e. less than half of the ~125 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 2HDM 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 bb-associated-production using its τ^+ τ^- and μ^+ μ^- decays at low invariant mass.

arXiv comment19 pages, 15 figures, references and a short comment added

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• Interference effect on heavy Higgs resonance signal in γγand ZZ channels
• Testing CP-Violation in the Scalar Sector at Future $e^{+}{e}^{-}$ Colliders
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• The 30 GeV Dimuon Excess at ALEPH
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• Two Higgs doublet model fitting and $t\bar{t}b\bar{b}$ signal at the ILC
• Phenomenology of the Sterile Neutrinos