Flavored Leptogenesis and Neutrino Mass with $A_4$ Symmetry

TL;DR

This paper introduces a minimal $A_4$ flavor symmetric model that explains neutrino masses and mixing, predicts a normal hierarchy, and successfully accounts for leptogenesis through renormalization effects.

Contribution

It presents a novel $A_4$ symmetric framework with $Z_2 imes Z_3$ symmetry that links neutrino phenomenology with leptogenesis, emphasizing flavor structure effects.

Findings

Favors normal hierarchy of neutrinos

Predicts a correlation between atmospheric angle and CP phase

Achieves successful leptogenesis via RG running

Abstract

We propose a minimal $A_4$ flavor symmetric model, assisted by $Z_2 \times Z_3$ symmetry, which can naturally takes care of the appropriate lepton mixing and neutrino masses via Type-I seesaw. It turns out that the framework, originated due to a specific flavor structure, favors the normal hierarchy of light neutrinos and simultaneously narrows down the range of Dirac CP violating phase. It predicts an interesting correlation between the atmospheric mixing angle and the Dirac CP phase too. While the flavor structure indicates an exact degeneracy of the right handed neutrino masses, renormalization group running of the same from a high scale is shown to make it quasi-degenerate and a successful flavor leptogenesis takes place within the allowed parameter space obtained from neutrino phenomenology.