An A4 model for neutrinos

TL;DR

This paper explores an A4 flavor symmetry extension of the standard model, focusing on neutrino masses and mixing angles, with specific predictions for reactor and atmospheric angles.

Contribution

It introduces a three-Higgs-doublet A4-invariant model with detailed scalar potential analysis and phenomenological implications for neutrino mixing.

Findings

Reactor angle could be as large as 0.03

Atmospheric mixing angle is close to maximal

Provides a framework for neutrino mass and mixing predictions

Abstract

The study of an extension of the standard model based on the flavor symmetry A4 is presented. Neutrino Majorana mass terms arise from dimension five operator and charged lepton masses from renormalizable Yukawa couplings. We introduce three Higgs doublets that belong to one triplet irreducible representation of A4. We study the most general A4-invariant scalar potential and the phenomenological consequences of the model. We find that the reactor angle could be as large as 0.03, while the atmospheric mixing angle is close to maximal.