An A4 model for lepton masses and mixings

TL;DR

This paper proposes an A4 flavor symmetry extension of the Standard Model with three Higgs doublets, analyzing neutrino masses, mixings, and scalar potential, predicting specific neutrino mixing angles.

Contribution

It introduces a new A4-invariant model with three Higgs doublets for lepton masses, analyzing scalar potential and neutrino mixing predictions.

Findings

Reactor angle could be as large as 0.03

Atmospheric mixing angle is close to maximal

Model's scalar potential is thoroughly studied

Abstract

We study an extension of the standard model based on the flavor symmetry A4 only. 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.