A model for tri-bimaximal mixing from a completely broken A4

We propose a new A4 model in which both the right-handed neutrinos and right-handed charged leptons transform as A4 singlets. We reproduce tri-bimaximal mixing pattern exactly although the A4 symmetry is broken completely at leading order in both the neutrino and charged lepton sectors. The charged lepton mass hierarchies are controlled by the spontaneous breaking of the flavor symmetry. The light neutrino spectrum is predicted to be of normal type and the lightest neutrino is massless at leading order. Although the reactor angle θ13 is expected to be of order λc2 from the next to leading order corrections, this model cannot be ruled out by current experimental data including the latest T2K results. Leptogenesis is realized via the resonant leptogenesis of the second and the third heavy right-handed neutrinos which are degenerate at leading order. The phenomenological consequences for lepton flavor violation are discussed in detail.