Deviations from tribimaximal mixing due to the vacuum expectation value misalignment in A_4 models

Understand

The addition of an A_4 family symmetry and extended Higgs sector to the Standard Model can generate the tribimaximal mixing pattern for leptons, assuming the correct vacuum expectation value alignment of the Higgs scalars.

• Deviating this alignment affects the predictions for the neutrino oscillation and neutrino mass observables.
• An attempt is made to classify the plethora of models in the literature, with respect to the chosen A_4 particle assignments.
• Of these models, two particularly popular examples have been analyzed for deviations from tribimaximal mixing by perturbing the vacuum expectation value alignments.