Vector Quarks in the Higgs Triplet Model

TL;DR

This paper explores how adding vector-like fermions to the Higgs Triplet Model affects electroweak precision constraints and Higgs decay processes, potentially aligning theoretical predictions with experimental data.

Contribution

It introduces vector fermions into the Higgs Triplet Model and analyzes their impact on electroweak constraints and Higgs decay phenomenology.

Findings

Vector quarks can relax constraints on the doubly charged Higgs mass.

Vector-like fermions influence loop-induced Higgs decays to gamma gamma and Z gamma.

Model parameter space is restricted by electroweak and decay process considerations.

Abstract

We analyze the effects of introducing vector fermions in the Higgs Triplet Model. In this scenario, the model contains, in addition to the Standard Model particle content, one triplet Higgs representation, and a variety of vector-like fermion states, including singlet, doublet, and triplet states. We investigate the electroweak precision variables and impose restrictions on model parameters. We show that, for some representations, introducing vector quarks significantly alters the constraints on the mass of the doubly charged Higgs boson, bringing it in closer agreement with experimental constraints. We also study the effects of introducing the vector-like fermions on neutral Higgs phenomenology, in particular on the loop-dominated decays H -> gamma gamma and H -> Z gamma, and the restrictions they impose on the parameter space.