Neutrino mixing and Leptogenesis with modular $S_3$ symmetry in the framework of type III seesaw

TL;DR

This paper investigates how modular $S_3$ symmetry influences neutrino masses, mixing, and leptogenesis within the type III seesaw framework, offering a minimal scalar setup and explaining baryon asymmetry.

Contribution

It introduces a novel application of modular $S_3$ symmetry to neutrino phenomenology and leptogenesis in the type III seesaw model with fewer scalar fields.

Findings

Neutrino mixing consistent with current observations.

A viable leptogenesis scenario at TeV scale.

Reduced scalar field requirements due to symmetry.

Abstract

Discrete symmetries being preferred to explain the neutrino phenomenology, we chose the simplest $S_3$ group and explore the implication of its modular form on neutrino masses and mixing. Non-trivial transformations of Yukawa couplings under this symmetry, make the model phenomenologically interesting by reducing the requirement of multiple scalar fields. This symmetry imposes a specific flavor structure to the neutrino mass matrix within the framework of less frequented type III seesaw mechanism and helps to explore the neutrino mixing consistent with the current observation. Apart, we also explain the preferred scenario of leptogenesis to explain the baryon asymmetry of the universe by generating the lepton asymmetry from the decay of heavy fermion triplet at TeV scale.