Probing the Higgs sector of $Y=0$ Higgs Triplet Model at LHC

TL;DR

This paper explores the Higgs Triplet Model with zero hypercharge, analyzing its parameter space, decay modes, and compatibility with LHC data, revealing new insights into Higgs decay correlations and the mass of charged Higgs bosons.

Contribution

It provides a comprehensive analysis of the HTM0, including parameter constraints, decay modes, and the impact of various scenarios on LHC Higgs signals, highlighting novel decay correlations.

Findings

Severe reduction in parameter space when one-loop Veltman conditions are applied.

Favours a light charged Higgs with mass around 176-178 GeV.

Diphoton decay and H→Zγ are not always positively correlated, showing anti-correlation in some scenarios.

Abstract

In this paper, we investigate the Higgs Triplet Model with hypercharge $Y_{\Delta}=0$ (HTM0), an extension of the Standard model, caracterised by a more involved scalar spectrum consisting of two CP even Higgs $h^0, H^0$ and two charged Higgs bosons $H^\pm$. We first show that the parameter space of HTM0, usually delimited by combined constraints originating from unitarity and BFB as well as experimental limits from LEP and LHC, is severely reduced when the modified Veltman conditions at one loop are also imposed. Then, we perform an rigorous analysis of Higgs decays either when $h^0$ is the SM-like or when the heaviest neutral Higgs $H^0$ is identified to the observed $125$ GeV Higgs boson at LHC. In these scenarios, we perform an extensive parameter scan, in the lower part of the scalar mass spectrum, with a particular focus on the Higgs to Higgs decay modes $H^0 \to h^0h^0, H^\pm\,H^\mp$ leading predominantly to invisible Higgs decays. Finally, we also study the scenario where $h^0, H^0$ are mass degenerate. We thus find that consistency with LHC signal strengths favours a light charged Higgs with a mass about $176\sim178$ GeV. Our analysis shows that the diphoton Higgs decay mode and $H \to Z \gamma$ are not always positively correlated as claimed in a previous study. Anti-correlation is rather seen in the scenario where $h$ is SM like, while correlation is sensitive to the sign of the potential parameter $\lambda$ when $H$ is identified to $125$ GeV Higgs.