A new A4 model for lepton mixing

TL;DR

This paper introduces a new A4 family symmetry model for leptons that predicts mixing angles and CP phase consistent with experimental data, providing specific bounds on key parameters.

Contribution

The paper proposes a novel A4-based lepton mixing model that yields predictions invariant under flavor permutations, aligning with observed neutrino oscillation data.

Findings

sin^2(theta12) >~ 0.34

|cos(delta)| >~ 0.7

| 0.5 - sin^2(theta23) | >~ 0.08

Abstract

We present a new model of the lepton sector that uses a family symmetry A4 to make predictions for lepton mixing which are invariant under any permutation of the three flavours. We show that those predictions broadly agree with the experimental data, leading to a largish sin^2(theta12) >~ 0.34, to |cos(delta)| >~ 0.7, and to | 0.5 - sin^2(theta23) | >~ 0.08; cos(delta) and 0.5 - sin^2(theta23) are predicted to have identical signs.