Unflavored Leptogenesis and Neutrino Masses in Flavored SUSY SU(5) model

TL;DR

This paper presents a supersymmetric SU(5) model with D4 flavor symmetry that explains neutrino masses and mixing, predicts normal hierarchy, and accounts for the baryon asymmetry via unflavored leptogenesis.

Contribution

It introduces a novel D4 flavor symmetric SU(5) model that links neutrino properties with baryogenesis through unflavored leptogenesis mechanisms.

Findings

Predicts normal hierarchy for neutrino masses.

Effective neutrino mass range testable in future experiments.

Baryon asymmetry generated via corrections to the Dirac operator.

Abstract

We propose a model with $D_4$ flavor symmetry for leptogenesis in the framework of supersymmetric $SU(5)$ grand unified theory. Neutrino masses arise from the type I seesaw mechanism where the spontaneous symmetry breaking of the flavor symmetry leads to the well-known trimaximal mixing ($TM_2$). We find that this model predicts the normal hierarchy (NH) for neutrino masses. We also find that the predicted range of the effective neutrino mass $m_{\beta\beta}$ can be tested at future neutrinoless double beta decay experiments. For the generation of the baryon asymmetry of the Universe (BAU), we consider the unflavored leptogenesis regime and we take into account the decay of the three righ-handed neutrinos $N_i$. We conclude that the BAU originates from a correction to the Dirac operator giving rise to a new coupling and a $CP$ phase which both play an important role in generating the observed BAU.