Natural soft leptogenesis

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Published 22 June 2005 • Published under licence by IOP Publishing Ltd
, , Citation Yuval Grossman et al JHEP06(2005)058 DOI 10.1088/1126-6708/2005/06/058

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Author affiliations

1 Department of Physics, Technion-Israel Institute of Technology, Technion City, 32000 Haifa, Israel

2 Physics Department, Boston University, Boston, MA 02215, U.S.A

3 Jefferson Laboratory of Physics, Harvard University, Cambridge, MA 02138, U.S.A.

4 School of Natural Sciences, Institute for Advanced Study, Einstein Drive, Princeton, NJ 08540, U.S.A

5 Department of Physics, University of California, Berkeley, CA 94720, U.S.A.

6 Theoretical Physics Group, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, U.S.A.

Dates

  1. Received 23 April 2005
  2. Accepted 9 May 2005
  3. Published

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1126-6708/2005/06/058

Abstract

Successful soft leptogenesis requires small B-terms for the right-handed sneutrinos and a large CP violating phase between the A- and B-terms. We show that this situation is realized naturally within the framework of gauge mediated supersymmetry breaking. The A-term is dominated by contribution from gauge mediation, while supergravity effects are more important for the B-term. The different origins naturally explain simultaneously the smallness of the B-term and the large CP violating phase. The most stringent bounds on the model come from the cosmological gravitino problem. We find a viable parameter region with very light gravitino m3/2 ≲ 16 eV, providing a consistent framework for supersymmetry phenomenology, soft leptogenesis and cosmology.

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10.1088/1126-6708/2005/06/058