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Quasidegenerate neutrinos and leptogenesis from Lμ−Lτ

E. J. Chun

K. Turzyński

  • Michigan Center for Theoretical Physics, Department of Physics,University of Michigan, Ann Arbor, Michigan 48109, USA and Korea Institute for Advanced Study, 207-43 Cheongryangri-dong, Dongdaemun-gu, Seoul 130-012, Korea

  • Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA

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Phys. Rev. D 76, 053008 – Published 28 September, 2007

DOI: https://doi.org/10.1103/PhysRevD.76.053008

Abstract

We provide a framework for quasidegenerate neutrinos consistent with a successful leptogenesis, based on the Lμ−Lτ flavor symmetry and its breaking pattern. In this scheme, a fine-tuning is needed to arrange the small solar neutrino mass splitting. Once it is ensured, the atmospheric neutrino mass splitting and the deviation from the maximal atmospheric mixing angle Δθ23 are driven by the same symmetry breaking parameter λ∼0.1, and the reactor angle θ13 is predicted to be slightly smaller than λ while the Dirac CP phase is generically of order one. Given that the pseudo-Dirac nature of right-handed neutrinos is protected from the flavor symmetry breaking, a small mass splitting can be generated radiatively. For moderate values of tanβ∼10, this allows for low-scale supersymmetric leptogenesis, overcoming a strong washout effect of the quasidegenerate light neutrinos and evading the gravitino overproduction.

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Phys. Rev. D 76, 053008– Published 28 September, 2007
  • Received 8 May 2007

© 2007 American Physical Society

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