New Simple A_4 Neutrino Model for Nonzero \theta_{13} and Large \delta_{CP}

TL;DR

This paper proposes a simple A_4 symmetry-based neutrino model that explains the nonzero heta_{13} angle and predicts large leptonic CP violation, aligning with current experimental data.

Contribution

It introduces a new A_4 symmetry application that naturally accounts for nonzero heta_{13} and large heta_{CP}, providing a minimal and predictive neutrino mass model.

Findings

Leptonic CP violation is necessarily large for current heta_{13} values.

The model predicts | an heta_{CP}| > 1.3.

The approach aligns with experimental measurements of neutrino mixing angles.

Abstract

In a new simple application of the non-Abelian discrete symmetry $A_4$ to charged-lepton and neutrino mass matrices, we show that for the current experimental central value of $\sin^2 2 \theta_{13} \simeq 0.1$, leptonic CP violation is necessarily large, i.e. $|\tan \delta_{CP}| > 1.3$.