Connecting low-energy CP violation, resonant leptogenesis and neutrinoless double beta decay in a radiative seesaw model

TL;DR

This paper explores how a radiative seesaw model with quasi-degenerate neutrinos can explain baryon asymmetry via resonant leptogenesis, linking low-energy CP violation to neutrinoless double beta decay.

Contribution

It demonstrates the connection between low-energy CP phases, resonant leptogenesis, and neutrinoless double beta decay within a specific radiative seesaw framework.

Findings

Normal hierarchy of neutrino masses is favored.

Baryon asymmetry depends on CP phases.

Effective neutrino mass for double beta decay is evaluated.

Abstract

We present a study of resonant leptogenesis in a radiative seesaw model. We consider the case where two quasi-degenerate right-handed neutrinos realize resonant leptogenesis, and the CP violation necessary to achieve leptogenesis occurs through the CP phases present in the neutrino mixing matrix. A numerical analysis is performed by taking the best-fit values from the current global data for three neutrino mixing angles and two mass-squared differences. We have shown how the predicted value of baryon asymmetry depends on the Dirac and Majorana CP phases. With the particular choice for the mass parameters, this model prefers a normal hierarchy of neutrino masses based on the value of baryon asymmetry predicted. Using the constrained CP phases, we evaluate the effective neutrino mass, which is relevant to the neutrinoless double beta decay.