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Lepton flavor violation in complex SUSY seesaw models with nearly tribimaximal mixing

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Abstract

We survey the lepton flavor violation branching ratios Br(μ → eγ), Br(τ → μγ), and Br(τ → eγ) in mSUGRA for a broad class of lepton mass matrix textures that give nearly tribimaximal lepton mixing. Small neutrino masses are generated by the type-I seesaw mechanism with non-degenerate right-handed neutrino masses. The textures exhibit a hierarchical mass pattern and can be understood from flavor models giving rise to large leptonic mixing. We study the branching ratios for the most general CP-violating forms of the textures. It is demonstrated that the branching ratios can be enhanced by 2-3 orders of magnitude as compared to the CP-conserving case. The branching ratios exhibit, however, a strong dependence on the choice of the phases in the Lagrangian which affects the significance of flavor models. In particular, for general CP-phases, the lepton flavor violating rates appear to be essentially uncorrelated with the possible high-and low-energy lepton mixing parameters, such as the reactor angle.

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Authors and Affiliations

  1. School of Physics and Astronomy, University of Manchester, Manchester, M13 9PL, United Kingdom

    Frank F. Deppisch

  2. SISSA and INFN-Sezione di Trieste, via Bonomea 265, 34136, Trieste, Italy

    Florian Plentinger

  3. Institut für Theoretische Physik und Astrophysik, Universität Würzburg, 97074, Würzburg, Germany

    Gerhart Seidl

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  1. Frank F. Deppisch
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Correspondence to Florian Plentinger.

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Deppisch, F.F., Plentinger, F. & Seidl, G. Lepton flavor violation in complex SUSY seesaw models with nearly tribimaximal mixing. J. High Energ. Phys. 2011, 4 (2011). https://doi.org/10.1007/JHEP01(2011)004

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