Dark Matter in the Higgs Triplet Model

TL;DR

This paper explores how adding vectorlike leptons to the Higgs Triplet Model can simultaneously address neutrino masses and dark matter, aligning with experimental constraints and improving model consistency.

Contribution

It demonstrates that vectorlike leptons enable the Higgs Triplet Model to account for dark matter while satisfying experimental and observational constraints.

Findings

Model is consistent with dark matter detection limits

Electroweak precision variables are improved

Mass restrictions on doubly charged particles are relaxed

Abstract

The inability to predict neutrino masses and the existence of the dark matter are two essential shortcomings of the Standard Model. The Higgs Triplet Model provides an elegant resolution of neutrino masses via the seesaw mechanism. We show here that introducing vectorlike leptons in the model also provides a resolution to the problem of dark matter. We investigate constraints, including the invisible decay width of the Higgs boson and the electroweak precision variables, and impose restrictions on model parameters. We analyze the effect of the relic density constraint on the mass and Yukawa coupling of dark matter. We also calculate the cross sections for indirect and direct dark matter detection and show our model predictions for the neutrino and muon fluxes from the Sun, and the restrictions they impose on the parameter space. With the addition of vectorlike leptons, the model is completely consistent with dark matter constraints, in addition to improving electroweak precision and doubly charged mass restrictions, which are rendered consistent with present experimental data.