Tri-bimaximal neutrino mixing and discrete flavour symmetries

Authors

  • G. Altarelli,

    1. Dipartimento di Fisica ‘E. Amaldi', Universit’ di Roma Tre, INFN, Sezione di Roma Tre, 00146 Rome, Italy
    2. CERN, Department of Physics, Theory Division, 1211 Geneva 23, Switzerland
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  • F. Feruglio,

    1. Dipartimento di Fisica ‘G. Galilei’, Università di Padova, INFN, Sezione di Padova, Via Marzolo 8, 35131 Padua, Italy
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  • L. Merlo

    Corresponding author
    1. Physik-Department, Technische Universität München, James-Franck-Strasse, 85748 Garching, Germany
    2. Institute for Advanced Study, Technische Universität München, Lichtenbergstrasse 2a, 85748 Garching, Germany
    • Institute for Advanced Study, Technische Universität München, Lichtenbergstrasse 2a, 85748 Garching, Germany
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Abstract

We review the application of non-Abelian discrete groups to Tri-Bimaximal (TB) neutrino mixing, which is supported by experiment as a possible good first approximation to the data. After summarizing the motivation and the formalism, we discuss specific models, mainly those based on A4 but also on other finite groups, and their phenomenological implications, including the extension to quarks. The recent measurements of θ13 favour versions of these models where a suitable mechanism leads to corrections to θ13 that can naturally be larger than those to θ12 and θ23. The virtues and the problems of TB mixing models are discussed, also in connection with lepton flavour violating processes, and the different approaches are compared.

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