Charged lepton flavour violating radiative decays ℓi → ℓj + γ in see-saw models with A4 symmetry
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- Hagedorn, C., Molinaro, E. & Petcov, S.T. J. High Energ. Phys. (2010) 2010: 47. doi:10.1007/JHEP02(2010)047
The charged lepton flavour violating (LFV) radiative decays, μ → e + γ, τ → μ + γ and τ → e + γ are investigated in a class of supersymmetric A4 models with three heavy right-handed (RH) Majorana neutrinos, in which the lepton (neutrino) mixing is predicted to leading order (LO) to be tri-bimaximal. The light neutrino masses are generated via the type I see-saw mechanism. The analysis is done within the framework of the minimal supergravity (mSUGRA) scenario, which provides flavour universal boundary conditions at the scale of grand unification MX ≈ 2 × 1016 GeV. Detailed predictions for the rates of the three LFV decays are obtained in two explicit realisations of the A4 models due to Altarelli and Feruglio and Altarelli and Meloni, respectively.