Neutrino mass matrix in triplet Higgs models with A4 symmetry

We consider triplet Higgs model with A4 symmetry to generate the neutrino mass matrix. The tribimaximal form of the neutrino mixing matrix can be naturally obtained. Imposing the neutrino oscillation data, we show that 1) both normal and inverted mass hierarchy are allowed, 2) there is a lower bound on the lightest neutrino mass and the effective mass for neutrinoless double beta decay, 3) the non-vanishing θ13 can be accommodated by considering small perturbation, 4) θatm should be very close to π/4 even after perturbation.