Abelian family symmetries and Leptogenesis

TL;DR

This paper investigates how Abelian and discrete horizontal symmetries influence leptogenesis, simplifying parameter descriptions and potentially enhancing baryon asymmetry production.

Contribution

It provides a new framework linking Abelian family symmetries to leptogenesis parameters and explores the effects of discrete symmetries on leptogenesis efficiency.

Findings

Abelian symmetries simplify leptogenesis parameter space

Discrete symmetries can enhance leptogenesis

Spontaneous symmetry breaking introduces a small expansion parameter

Abstract

We study the impact of a set of horizontal symmetries on the requirements for producing the baryon asymmetry of the universe via leptogenesis. We find that Abelian horizontal symmetries lead to a simple description of the parameters describing leptogenesis in terms of the small expansion parameter that arises from spontaneous symmetry breaking. If the family symmetry is made discrete, then an enhancement in the amount of leptogenesis can result.