Triplet Scalar Dark Matter and Leptogenesis in an Inverse See-Saw Model of Neutrino Mass Generation

TL;DR

This paper introduces a model combining triplet scalar dark matter and leptogenesis at the TeV scale within an inverse see-saw framework, linking neutrino mass generation, dark matter, and baryogenesis.

Contribution

It presents a UV completion of the inverse see-saw with fermion triplets enabling TeV-scale leptogenesis and a scalar triplet dark matter candidate, connecting neutrino masses and cosmological phenomena.

Findings

Viable TeV-scale leptogenesis with fermion triplets.

Dark matter candidate is the lightest neutral scalar triplet.

Enhanced Higgs decay to gamma gamma and large invisible Higgs branching ratios.

Abstract

We propose a UV completion of the inverse see-saw scenario using fermion SU(2) triplet representations. Within this framework, a variation of the standard thermal leptogenesis is achievable at the O(TeV) scale, owing to the presence of a viable dark matter candidate. This baryogenesis scenario is ruled out if a triplet fermion is observed at the LHC. The dark matter is given by the lightest neutral component of a complex scalar SU(2) triplet, with mass in the TeV range. The scalar sector, which is enriched in order to account for the small neutrino masses, is treated in detail and shows potentially sizable Higgs boson h \to \gamma \gamma\ rates together with large h invisible branching ratios.