We propose a renormalizable multi-Higgs model with $A_4\otimes Z_2\otimes Z_2^{\prime }$ symmetry accounting for the experimental deviation from the tribimaximal mixing pattern of the neutrino mixing matrix. In this framework we study the charged lepton and neutrino masses and mixings. The light neutrino masses are generated via a radiative seesaw mechanism, which involves a single heavy Majorana neutrino and neutral scalars running in the loops. The obtained neutrino mixings and mass squared splittings are in good agreement with the neutrino oscillation experimental data for both normal and inverted hierarchy. The model predicts an effective Majorana neutrino mass $m_{\beta \beta }=4$ and 50 meV for the normal and the inverted neutrino spectrum, respectively. The model also features a suppression of $CP$ violation in neutrino oscillations, a low scale for the heavy Majorana neutrino (few TeV) and, due to the unbroken $Z_2$ symmetry, a natural dark matter candidate.

• Received 24 July 2013

DOI:https://doi.org/10.1103/PhysRevD.88.076014