Scalar Triplet Flavor Leptogenesis with Dark Matter

TL;DR

This paper explores a variant of type-II seesaw that includes an inert Higgs doublet and a right-handed neutrino, demonstrating how their interactions enable flavored leptogenesis to explain the Universe's baryon asymmetry while also accounting for dark matter.

Contribution

It introduces a minimal model combining type-II seesaw with an inert Higgs doublet and right-handed neutrino, linking neutrino mass, dark matter, and baryogenesis.

Findings

Dark matter is the lightest neutral inert Higgs component.

Leptogenesis is achieved via decay of the scalar triplet.

Model successfully explains baryon asymmetry and dark matter abundance.

Abstract

We investigate a simple variant of type-II seesaw, responsible for neutrino mass generation, where the particle spectrum is extended with one singlet right-handed neutrino and an inert Higgs doublet, both odd under an additional $Z_2$ symmetry. While the role of the dark matter is played by the lightest neutral component of the inert Higgs doublet, its interaction with the Standard Model lepton doublets and the right-handed neutrino turns out to be crucial in generating the correct baryon abundance of the Universe through flavored leptogenesis from the decay of the $SU(2)_L$ scalar triplet, involved in type-II framework.