Resonant Leptogenesis in the Minimal B-L Extended Standard Model at TeV

TL;DR

This paper explores how resonant leptogenesis in a minimal B-L extended Standard Model at TeV scale can explain the observed baryon asymmetry, linking neutrino oscillation data with leptogenesis under specific parameter conditions.

Contribution

It demonstrates that a simplified parameter ansatz allows simultaneous reproduction of neutrino oscillation data and baryon asymmetry within a TeV-scale B-L extended Standard Model.

Findings

Baryon asymmetry can be enhanced or suppressed depending on model parameters.

A single CP-phase can account for both neutrino oscillations and baryon asymmetry.

Resonant leptogenesis is viable at TeV scale in this model.

Abstract

We investigate the resonant leptogenesis scenario in the minimal B-L extended standard model(SM) with the B-L symmetry breaking at the TeV scale. Through detailed analysis of the Boltzmann equations, we show how much the resultant baryon asymmetry via leptogenesis is enhanced or suppressed, depending on the model parameters, in particular, the neutrino Dirac Yukawa couplings and the TeV-scale Majorana masses of heavy degenerate neutrinos. In order to consider a realistic case, we impose a simple ansatz for the model parameters and analyze the neutrino oscillation parameters and the baryon asymmetry via leptogenesis as a function of only a single CP-phase. We find that for a fixed CP-phase all neutrino oscillation data and the observed baryon asymmetry of the present universe can be simultaneously reproduced.