Highly predictive and testable A4 flavor model within type-I and II seesaw framework and associated phenomenology

Abstract

We investigate neutrino mass model based on A4 discrete flavor symmetry in type-I+II seesaw framework. The model has imperative predictions for neutrino masses, mixing and CP violation testable in the current and upcoming neutrino oscillation experiments. The important predictions of the model are: normal hierarchy for neutrino masses, a higher octant for atmospheric angle (θ23>45°) and near-maximal Dirac-type CP phase (δ≈π/2 or 3π/2) at 3σ C.L. These predictions are in consonance with the latest global-fit and results from Super-Kamiokande (SK), NOνA and T2K. Also, one of the important feature of the model is the existence of a lower bound on effective Majorana mass, |Mee|≥0.047 eV (at 3σ) which corresponds to the lower part of the degenerate spectrum and is within the sensitivity reach of the neutrinoless double beta decay (0νββ) experiments.