Non-zero θ13 and δCP in a neutrino mass model with A4 symmetry

Abstract

In this paper, we consider a neutrino mass model based on A4 symmetry. The spontaneous symmetry breaking in this model is chosen to obtain tribimaximal mixing in the neutrino sector. We introduce Z2 × Z2 invariant perturbations in this model which can give rise to acceptable values of θ13 and δCP. Perturbation in the charged lepton sector alone can lead to viable values of θ13, but cannot generate δCP. Perturbation in the neutrino sector alone can lead to acceptable θ13 and maximal CP violation. By adjusting the magnitudes of perturbations in both sectors, it is possible to obtain any value of δCP.