Natural soft leptogenesis

Yuval Grossman, Ryuichiro Kitano, Hitoshi Murayama

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


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.

Original languageEnglish
Pages (from-to)1357-1367
Number of pages11
JournalJournal of High Energy Physics
Issue number6
StatePublished - 1 Jun 2005
Externally publishedYes


  • Baryogenesis
  • Cosmology of Theories beyond the SM
  • Supersymmetry Breaking


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