Quasi-degenerate neutrinos and tri-bi-maximal mixing

TL;DR

This paper investigates how high-energy tri-bi-maximal mixing and a non-Abelian discrete family symmetry can lead to quasi-degenerate neutrino masses and consistent leptonic mixing angles through radiative running.

Contribution

It presents a model linking non-Abelian discrete symmetries to quasi-degenerate neutrino masses and near tri-bi-maximal mixing, analyzing the radiative corrections involved.

Findings

Limits on the high-energy scale from mixing angle consistency

A model connecting family symmetry to neutrino mass spectrum

Predictions for neutrino mixing angles and mass hierarchy

Abstract

Assuming high-energy tri-bi-maximal mixing we study the radiative running of leptonic mixing angles and obtain limits on the high-energy scale from requiring consistency with the observed mixing. We construct a model in which a non-Abelian discrete family symmetry leads both to a quasi-degenerate neutrino mass spectrum and to near tri-bi-maximal mixing.