LFV and Dipole Moments in Models with A4 Flavour Symmetry

Understand

It is presented an analysis on lepton flavour violating transitions, leptonic magnetic dipole moments and electric dipole moments in a class of models characterized by the flavour symmetry A4 x Z3 x U(1)_FN, whose choice is motivated by the approximate Tri-Bimaximal mixing observed in neutrino oscillations.

• A low-energy effective Lagrangian is constructed, where these effects are dominated by dimension six operators, suppressed by the scale M of new physics.
• All the flavour breaking effects are universally described by the vacuum expectation values of a set of spurions.
• Two separate cases, a supersymmetric and a general one, are described.