Scalar Sector Phenomenology of Three-Loop Radiative Neutrino Mass Models

TL;DR

This paper explores the scalar sector in two three-loop neutrino mass models with dark matter candidates, analyzing their impact on Higgs properties and electroweak phase transition.

Contribution

It provides a detailed phenomenological analysis of scalar effects in models generating neutrino mass at three loops, including their influence on Higgs physics and phase transition.

Findings

Extra scalars modify Higgs decay channels, especially $h\rightarrow\gamma\gamma$.

Electroweak phase transition can be strongly first-order in these models.

Observable effects on Higgs couplings and phase transition dynamics.

Abstract

We perform a phenomenological study of the scalar sector of two models that generate neutrino mass at the three-loop level and contain viable dark matter candidates. Both models contain a charged singlet scalar and a larger scalar multiplet (triplet or quintuplet). We investigate the effect of the extra scalars on the Higgs mass and analyze the modifications to the triple Higgs coupling. The new scalars can give observable changes to the Higgs decay channel $h\rightarrow\gamma \gamma$ and, furthermore, we find that the electroweak phase transition becomes strongly first-order in large regions of parameter space.