h\to \gamma \gamma In Inert Higgs Doublet Model

TL;DR

This paper explores how the Inert Higgs Doublet Model can explain potential di-photon signals of a Higgs-like boson at the LHC, considering various experimental and theoretical constraints.

Contribution

It analyzes the impact of charged Higgs contributions and invisible decays on the di-photon rate within the IHDM framework, incorporating multiple experimental limits.

Findings

Charged Higgs can enhance or suppress di-photon rate.

Invisible Higgs decays can reduce the di-photon signal.

Constraints from LEP, Tevatron, and LHC are compatible with IHDM.

Abstract

Motivated by the recent result reported from LHC on the di-photon search for a Standard Model (SM) Higgs-like boson. We discuss the implications of this possible signal in the framework of the Inert Higgs Doublet Model (IHDM), taking into account previous limits from Higgs searches at LEP, the Tevatron and the LHC as well as constraints from unitarity, vacuum stability and electroweak precision tests. We show that the charged Higgs contributions can interfere constructively or destructively with the W gauge bosons loops leading to enhancement or suppression of the di-photon rate with respect to SM rate. We show also that the invisible decay of the Higgs, if open, could affect the total width of the SM Higgs boson and therefore suppress the di-photon rate.