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S 3 flavor symmetry and leptogenesis

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Abstract.

We consider leptogenesis in a minimal S 3 extension of the standard model with an additional Z 2 symmetry in the leptonic sector. It is found that the CP phase appearing in the mass matrix of the left-handed neutrinos is the same as that for the CP asymmetries responsible for leptogenesis. Because of the discrete S 3 x Z 2 flavor symmetries, the CP asymmetries are strongly suppressed. To obtain a realistic size of the baryon number asymmetry in the universe, we therefore have to assume that resonant enhancement of the CP asymmetries takes place, and that three degenerate right-handed neutrino masses of O(10) TeV are present.

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Authors and Affiliations

  1. Institute for Theoretical Physics, Kanazawa University, 920-1192, Kanazawa, Japan

    T. Araki & J. Kubo

  2. Institut für Physik, Universität Dortmund, Otto-Hahn-Str.4, 44221, Dortmund, Germany

    E. A. Paschos

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  1. T. Araki
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  2. J. Kubo
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  3. E. A. Paschos
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Correspondence to T. Araki.

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Arrival of the final proofs: 22 November 2005

PACS:

11.30.Hv, 12.15.Ff, 14.60.Pq

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Araki, T., Kubo, J. & Paschos, E.A. S 3 flavor symmetry and leptogenesis. Eur. Phys. J. C 45, 465–475 (2006). https://doi.org/10.1140/epjc/s2005-02434-3

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