Gauged B-L Leptogenesis

TL;DR

This paper introduces a novel leptogenesis mechanism within a supersymmetric gauged B-L model at TeV energies, utilizing gauge interactions of singlet neutrinos instead of tiny Yukawa couplings, contingent on specific scalar interactions being absent.

Contribution

It presents a new leptogenesis scenario that leverages B-L gauge interactions and avoids the need for resonance enhancement of Yukawa couplings.

Findings

Leptogenesis can occur via B-L gauge interactions without tiny Yukawa couplings.

Successful leptogenesis depends on forbidding a particular scalar bilinear term.

The model operates effectively at TeV energy scales.

Abstract

We propose a new leptogenesis scenario in a gauged $B-L$ model with supersymmetry at the TeV energy scale. Instead of relying on the very small Yukawa couplings of the singlet neutrinos $N^c$ to generate the observed baryon asymmetry of the Universe, which requires a very large resonance enhancement, their $B-L$ gauge interactions are invoked. Successful leptogenesis is then possible if a particular scalar bilinear $\tilde N^c \tilde N^c$ term is disallowed.