Neutrino phenomenology and stable dark matter with A4

TL;DR

This paper proposes a neutrino mass model based on A4 symmetry that predicts specific mixing angles and a stable dark matter candidate, with implications for neutrinoless double beta decay.

Contribution

It introduces a new A4-based model linking neutrino phenomenology with dark matter stability and makes specific predictions for mixing angles and decay rates.

Findings

Predicts theta_23 ~ pi/4 for small theta_13

Normal neutrino mass spectrum only

Effective mass |m_ee| > 4×10^{-4} eV

Abstract

We present a model based on the A4 non-abelian discrete symmetry leading to a predictive five-parameter neutrino mass matrix and providing a stable dark matter candidate. We found an interesting correlation among the atmospheric and the reactor angles which predicts theta_23 ~ pi/4 for very small reactor angle and deviation from maximal atmospheric mixing for large theta_13. Only normal neutrino mass spectrum is possible and the effective mass entering the neutrinoless double beta decay rate is constrained to be |m_ee| > 4 10^{-4} eV.