Active-Sterile neutrino masses and mixings in $A_4$ minimal extended seesaw mechanism

TL;DR

This paper proposes a minimal extended seesaw model with $A_4$ symmetry to explain active and sterile neutrino masses and mixings, successfully fitting experimental data including non-zero $ heta_{13}$.

Contribution

It introduces a novel $A_4$-based 3+1 neutrino mass model with specific Higgs fields that reproduces observed neutrino mixing parameters within experimental bounds.

Findings

Neutrino mixing parameters fit within 3$\sigma$ bounds.

Active-sterile mixing matrix consistent with experiments.

Model accommodates non-zero $ heta_{13}$.

Abstract

Assuming the existence of an eV or KeV scale sterile neutrino, we develop a 3+1 neutrino mass model using $A_4\times Z_4 \times Z_2$ symmetry group. Three Higgs $H, H^{\prime}$ and $H^{\prime\prime}$ are considered to give a desired neutrino mass matrix which generates non-zero $\theta_{13}$. The model can give neutrino mixing parameters that are well within the experimental 3$\sigma$ bounds. We also calculate the $4\times 4$ active-sterile neutrino mixing matrix, and it is found to be consistent with experimental bounds.