Leptogenesis, radiative neutrino masses and inert Higgs triplet dark matter

TL;DR

This paper proposes an extended standard model with inert fields that generate neutrino masses, enable leptogenesis, and provide dark matter candidates, analyzing their interactions and phenomenology.

Contribution

It introduces a novel inert field framework with specific symmetries, linking neutrino mass generation, leptogenesis, and dark matter within a unified model.

Findings

Inert Higgs doublet decays can successfully produce leptogenesis.

Interference effects significantly influence inert Higgs triplet dark matter properties.

The model provides viable dark matter candidates consistent with current constraints.

Abstract

We extend the standard model by three types of inert fields including Majorana fermion singlets/triplets, real Higgs singlets/triplets and leptonic Higgs doublets. In the presence of a softly broken lepton number and an exactly conserved Z_2 discrete symmetry, these inert fields together can mediate a one-loop diagram for a Majorana neutrino mass generation. The heavier inert fields can decay to realize a successful leptogenesis while the lightest inert field can provide a stable dark matter candidate. As an example, we demonstrate the leptogenesis by the inert Higgs doublet decays. We also perform a systematic study on the inert Higgs triplet dark matter scenario where the interference between the gauge and Higgs portal interactions can significantly affect the dark matter properties.