Resonant leptogenesis in (2,2) inverse see-saw realisation

TL;DR

This paper explores a (2,2) inverse see-saw model with complex neutrino mass matrices, analyzing its compatibility with neutrino oscillation data, lepton flavor violation constraints, and its potential to explain the universe's baryon asymmetry through resonant leptogenesis.

Contribution

It introduces a comprehensive analysis of a (2,2) inverse see-saw model with complex parameters, linking neutrino masses, lepton flavor violation, and baryon asymmetry.

Findings

Parameter space compatible with neutrino oscillation data identified.

Constraints from lepton flavor violating decays analyzed.

Resonant leptogenesis can produce the observed baryon asymmetry.

Abstract

In this present work, we uphold the standard model (SM) augmented with two right-handed (RH) neutrinos along with two singlet neutral fermions to generate active neutrino masses via (2,2) inverse see-saw mechanism. All entries of the neutrino mass matrix are taken to be complex to make this study a general one. We also investigate if the parameter points compatible with the neutrino oscillation data simultaneously satisfy the experimental bounds coming from the lepton flavour violating (LFV) decays : $\mu \to e \gamma,~ \tau \to e \gamma, ~ \tau \to \mu \gamma$. This study also explores the prospect of producing the baryon asymmetry of the universe through resonant leptogenesis. Here the resonant leptogenesis is induced by the lightest pair of degenerate mass eigenstates. Upon solving the coupled Boltzmann equations, one can divide the multi-dimensional model parameter space into three parts, where the parameter points are compatible with the neutrino oscillation data, constraints coming from the LFV decays and last but not the least, the observed baryon asymmetry of the universe.