Light Higgs in the Georgi Machacek Model: neutral or charged?

TL;DR

This paper investigates the implications of a 95 GeV SM-like Higgs in the Georgi-Machacek model, showing it disfavors additional low-mass Higgs states and suggests a high triplet vev based on collider constraints.

Contribution

It provides a detailed analysis of the Higgs spectrum in the GM model considering recent collider data and theoretical constraints, highlighting the impact of a 95 GeV Higgs on model parameters.

Findings

Presence of 95 GeV Higgs disfavours other low-mass Higgs below 160 GeV.

High triplet vev above 40 GeV is favored.

Constraints from LHC and previous experiments are consistent with the model analysis.

Abstract

The ATLAS and CMS experiments at the LHC, as well as the LEP and Tevatron, observed the existence of a light SM-like Higgs boson with mass about 95 GeV. These experiments also record the evidences of a light charged Higgs boson with mass less than the top-quark mass. The Georgi-Machacek (GM) model consists of six charged Higgs, one CP-odd and one CP-even Higgs besides the SM Higgs and the SM-like Higgs bosons. Considering the theoretical constraints along with the $\sqrt{s} = 13$ TeV Higgs signal strengths, this paper shows that the presence of the 95 GeV SM-like Higgs boson disfavours the presence of the other eight low-mass (below $160$ GeV) Higgs. This also triggers a high triplet vev above $40$ GeV.