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Charged lepton flavour violating radiative decays ℓ i → ℓ j + γ in see-saw models with A 4 symmetry

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Abstract

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 A 4 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 M X ≈ 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.

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Authors and Affiliations

  1. SISSA and INFN-Sezione di Trieste, via Beirut 2–4, Trieste, I-34151, Italy

    C. Hagedorn, E. Molinaro & S. T. Petcov

  2. IPMU, University of Tokyo, Tokyo, Japan

    S. T. Petcov

  3. Institute of Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, 1784, Sofia, Bulgaria

    S. T. Petcov

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  1. C. Hagedorn
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  2. E. Molinaro
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  3. S. T. Petcov
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Hagedorn, C., Molinaro, E. & Petcov, S.T. Charged lepton flavour violating radiative decays ℓ i → ℓ j + γ in see-saw models with A 4 symmetry. J. High Energ. Phys. 2010, 47 (2010). https://doi.org/10.1007/JHEP02(2010)047

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