Light Higgs bosons in Two-Higgs-Doublet Models

Understand

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.