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Implications of flavor dynamics for fermion triplet leptogenesis

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Abstract

We analyze the importance of flavor effects in models in which leptogenesis proceeds via the decay of Majorana electroweak triplets. We find that depending on the relative strengths of gauge and Yukawa reactions the B − L asymmetry can be sizably enhanced, exceeding in some cases an order of magnitude level. We also discuss the impact that such effects can have for TeV-scale triplets showing that as long as the B − L asymmetry is produced by the dynamics of the lightest such triplet they are negligible, but open the possibility for scenarios in which the asymmetry is generated above the TeV scale by heavier states, possibly surviving the TeV triplet related washouts. We investigate these cases and discuss how they can be disentangled by using Majorana triplet collider observables and, in the case of minimal type III see-saw models even through lepton flavor violation observables.

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Authors and Affiliations

  1. Universite de Liege, Institut de physique Bat B5, Sart Tilman, B-4000, Liege 1, Belgium

    Diego Aristizabal Sierra

  2. INFN, Laboratori Nazionali di Frascati, C.P. 13, I00044, Frascati, Italy

    Diego Aristizabal Sierra

  3. J. Stefan Institute, 1000, Ljubljana, Slovenia

    Jernej F. Kamenik & Miha Nemevšek

  4. II. Institut für Theoretische Physik, Universität Hamburg, Luruper Chaussee 149, 22761, Hamburg, Germany

    Miha Nemevšek

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  1. Diego Aristizabal Sierra
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  2. Jernej F. Kamenik
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  3. Miha Nemevšek
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Correspondence to Jernej F. Kamenik.

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ArXiv ePrint: 1007.1907

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Aristizabal Sierra, D., Kamenik, J.F. & Nemevšek, M. Implications of flavor dynamics for fermion triplet leptogenesis. J. High Energ. Phys. 2010, 36 (2010). https://doi.org/10.1007/JHEP10(2010)036

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