When The Standard Model Higgs Meets Its Lighter 95 GeV Twin

Abstract

Recent reports from the Large Hadron Collider indicate two excesses: one in the lighter Higgs mass region around 95 GeV, and another in the rare $Z\gamma$ final state of the Standard Model (SM) 125 GeV Higgs decay. These anomalies are analyzed within the minimal gauged two-Higgs-doublet model (G2HDM). A viable parameter space in G2HDM is identified that can account for both excesses. Within the viable parameter space, we find a strong correlation between the signal strengths of the SM 125 GeV Higgs decays into $\gamma \gamma$ and $Z\gamma$ modes. However, this correlation does not extend to the lighter 95 GeV Higgs.

Comments: 36 pages, 5 figures, 2 tables; title slightly changed; revised version matched published version