When The Standard Model Higgs Meets Its Lighter 95 GeV Twin

TL;DR

This paper explores anomalies in Higgs boson signals at 95 GeV and 125 GeV within the G2HDM framework, identifying parameter regions that explain both excesses and revealing correlations in decay modes.

Contribution

It demonstrates that the minimal G2HDM can simultaneously account for the observed Higgs excesses and details the decay mode correlations within this model.

Findings

G2HDM can explain both the 95 GeV and 125 GeV Higgs excesses.

A strong correlation exists between the 125 GeV Higgs decay modes into γγ and Zγ.

No correlation is found between the 95 GeV Higgs decay modes.

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.