Investigating the 95 GeV Higgs Boson Excesses within the I(1+2)HDM

Abstract

In this work, we explore how the 2-Higgs Doublet Model (2HDM) Type-I, extended by an inert doublet, can provide an explanation for the recently observed excesses at the Large Hadron Collider (LHC) in the ${\hat{I}}^3{\hat{I}}^3$ and $\ddot{I}{„}^{+}\ddot{I}{„}^{-}$ final states. Hence, by imposing theoretical constraints and experimental bounds on the model parameter space, our findings show that a light CP-even Higgs boson, $h$, with a mass around 95 GeV, can account for these anomalies. This result aligns with the excess in $b\bar{b}$ signatures reported in earlier data from the Large Electron-Positron (LEP) collider.

18 pages, 6 figures, 4 tables, references updated and version improved; accepted for publication in PRD