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Lepton mixing parameters from discrete and CP symmetries

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Abstract

We consider a scenario with three Majorana neutrinos in which a discrete, finite flavour group G f is combined with a generalized CP transformation. We derive conditions for consistently defining such a setup. We show that in general lepton mixing angles and CP phases (Dirac as well as Majorana) only depend on one single parameter θ which can take values between 0 and π, if the residual symmetries are G e ⊂ G f in the charged lepton and G ν = Z 2 × CP in the neutrino sector. We perform a comprehensive study for G f = S 4 and find five cases which are phenomenologically interesting. They naturally lead to a non-zero reactor mixing angle and all mixing parameters are strongly correlated. Some of the patterns predict maximal atmospheric mixing and maximal Dirac phase, while others predict trivial Dirac and Majorana phases.

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Authors and Affiliations

  1. Dipartimento di Fisica e Astronomia “G. Galilei”, Università di Padova, Via Marzolo 8, I-35131, Padua, Italy

    Ferruccio Feruglio & Claudia Hagedorn

  2. INFN, Sezione di Padova, Via Marzolo 8, I-35131, Padua, Italy

    Ferruccio Feruglio & Claudia Hagedorn

  3. SISSA, Via Bonomea 265, I-34136, Trieste, Italy

    Claudia Hagedorn

  4. Physik-Department, Technische Universität München, James-Franck-Strasse, D-85748, Garching, Germany

    Robert Ziegler

  5. TUM Institute for Advanced Study, Technische Universität München, Lichtenbergstrasse 2a, D-85748, Garching, Germany

    Robert Ziegler

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  1. Ferruccio Feruglio
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  2. Claudia Hagedorn
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  3. Robert Ziegler
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Correspondence to Claudia Hagedorn.

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ArXiv ePrint: 1211.5560

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Feruglio, F., Hagedorn, C. & Ziegler, R. Lepton mixing parameters from discrete and CP symmetries. J. High Energ. Phys. 2013, 27 (2013). https://doi.org/10.1007/JHEP07(2013)027

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