Tri-Bimaximal lepton mixing with A4 semidirect product Z2 x Z2 x Z2

Understand

We consider a model based on A4 semidirect product (Ze x Zmu x Ztau) flavor symmetry for Tri-Bimaximal lepton mixing with two scalar A4-triplets whose vacuum expectation values have the same alignment.

• Neutrino masses are generated through effective dimension five Weinberg operators.
• Charged leptons mass hierarchies are generated with an additional Froggatt-Nielsen U(1) flavor symmetry under which right-handed leptons are charged.