(Z_2)^3 Symmetry of the Tripartite Model

TL;DR

This paper derives the $(Z_2)^3$ symmetry underlying the tripartite neutrino mixing model, showing its compatibility with lepton mass patterns and baryon asymmetry generation in seesaw frameworks.

Contribution

It provides a simple derivation of the $(Z_2)^3$ symmetry and explores its implications for lepton masses and baryogenesis within neutrino mass models.

Findings

$(Z_2)^3$ symmetry uniquely characterizes the tripartite mixing.

The symmetry can accommodate all lepton mass patterns.

Potential for generating baryon asymmetry through lepton asymmetry.

Abstract

We derive in a simple way the $(Z_2)^3$ symmetry which characterizes uniquely the phenomenologically successful tripartite form leading to the tribimaximal mixing in the neutrino mass matrix. We impose this symmetry in a setup including the charged leptons and find that it can accommodate all the possible patterns of lepton masses in the framework of type-I and type-II seesaw mechanisms. We also discuss the possibility of generating enough baryon asymmetry through lepton-lepton asymmetry.