Flavor symmetric origin of texture zeros in minimal inverse seesaw and impacts on leptogenesis

TL;DR

This paper explores how flavor symmetry can explain texture zeros in the Dirac mass matrix within the inverse seesaw model, and investigates their implications for neutrino phenomenology and baryon asymmetry via leptogenesis.

Contribution

It introduces a flavor symmetry-based origin for texture zeros in the inverse seesaw model and analyzes their impact on leptogenesis and baryon asymmetry.

Findings

Certain two-zero textures are consistent with cosmological data on BAU.

Flavor symmetry $S_4$ can naturally generate the texture zeros.

Leptogenesis from quasi-Dirac pairs can account for the observed baryon asymmetry.

Abstract

We study the prediction of maximal zeros of the Dirac mass matrix on neutrino phenomenology and baryon asymmetry of the universe (BAU) within the framework of an inverse seesaw ISS $(2,3)$. We try to find the origin of the allowed two zero textures of the Dirac mass matrix from $S_{4}$ flavor symmetry. ISS $(2,3)$ model contains two pairs of quasi-Dirac particles and one sterile state in the keV scale along with three active neutrinos. The decays of the quasi-Dirac pairs create lepton asymmetry that can be converted to baryon asymmetry of the universe by the sphaleron process. Thus, BAU can be explained in this framework through leptogenesis. We study BAU in all the two zero textures of the Dirac mass matrix. The viabilities of the textures within the framework have been verified with the latest cosmology data on BAU.