Leptogenesis in the E$_6$SSM: Flavour Dependent Lepton Asymmetries

TL;DR

This paper explores how the E6SSM model can generate significant lepton asymmetries through right-handed neutrino decays, even at relatively low energy scales, impacting leptogenesis theories.

Contribution

It introduces a detailed analysis of flavour-dependent lepton asymmetries within the E6SSM, highlighting mechanisms that produce substantial asymmetries at low scales.

Findings

Leptogenesis can occur at scales as low as 10^6 GeV in the E6SSM.

Right-handed neutrino decays contribute to lepton asymmetry without gauge interaction participation.

New particles and interactions enhance lepton asymmetry generation.

Abstract

We discuss flavour dependent lepton asymmetries in the Exceptional Supersymmetric Standard Model (E$_6$SSM). In the E$_6$SSM, the right-handed neutrinos do not participate in gauge interactions, and they decay into leptons and leptoquarks. Their Majorana nature allows violation of lepton number. New particles and interactions can result in substantial lepton asymmetries, even for scales as low as $10^6 {\rm GeV}$.