Purely Flavored Leptogenesis at the TeV Scale

TL;DR

This paper explores a modified leptogenesis model that operates at the TeV scale, emphasizing the role of flavor effects and an additional symmetry-breaking scale, offering a potential explanation for baryon asymmetry.

Contribution

It introduces a novel leptogenesis scenario with an extra symmetry-breaking scale below the lightest neutrino mass, enabling TeV-scale baryogenesis through flavor effects.

Findings

Leptogenesis can occur at the TeV scale with the new scheme.

Flavor effects are crucial for baryon asymmetry in this model.

The model provides a viable alternative to high-scale leptogenesis.

Abstract

I study variations of the standard leptogenesis scenario that can arise if an additional mass scale related to the breaking of some new symmetry is present below the mass $M_{N_1}$ of the lightest right-handed Majorana neutrino. I present a particular realization of this scheme that allows for leptogenesis at the TeV scale. In this realization the baryon asymmetry is exclusively due to flavor effects.