Fermiophobia in a Higgs Triplet Model

TL;DR

This paper explores a Higgs triplet model where a fermiophobic Higgs boson naturally occurs, predicting distinctive signals at the LHC that differ from the Standard Model, especially in decay modes and branching ratios.

Contribution

It demonstrates that fermiophobia in a Higgs triplet model is naturally realized without fine-tuning and identifies unique experimental signatures for LHC detection.

Findings

Fermiophobia is naturally achieved in the model without fine-tuning.

Distinctive decay patterns for different Higgs mass regimes are predicted.

Large differences in decay branching ratios from the Standard Model are identified.

Abstract

A Fermiophobic Higgs boson can arise in models with an extended Higgs sector, such as models with scalars in an isospin triplet representation. In a specific model with a scalar triplet and spontaneous violation of lepton number induced by a scalar singlet field, we show that fermiophobia is not a fine-tuned situation, unlike in Two Higgs Doublet Models. We study distinctive signals of fermiophobia which can be probed at the LHC. For the case of a small Higgs mass a characteristic signal would be a moderate B(H ->\gamma\gamma) accompanied by a large B(H -> JJ) (where J is a Majoron), the latter being an invisible decay. For the case of a large Higgs mass there is the possibility of dominant H -> ZZ, WW and suppressed H -> JJ decay modes. In this situation, B(H -> ZZ) is larger than B(H -> WW), which differs from the SM prediction.