New ways to soft leptogenesis

Yuval Grossman, Tamar Kashti, Yosef Nir, Esteban Roulet

Research output: Contribution to journalArticlepeer-review

45 Scopus citations


Soft supersymmetry breaking terms involving heavy singlet sneutrinos provide new sources of lepton number violation and of CP violation. In addition to the CP violation in mixing, investigated previously, we find that 'soft leptogenesis' can be generated by CP violation in decay and in the interference of mixing and decay. These additional ways to leptogenesis can be significant for a singlet neutrino Majorana mass that is not much larger than the supersymmetry breaking scale, M ≲ 102mSUSY- In contrast to CP violation in mixing, for some of these new contributions the sneutrino oscillation rate can be much faster than the decay rate, so that the bilinear scalar term need not be smaller than its natural scale.

Original languageEnglish
Pages (from-to)1893-1908
Number of pages16
JournalJournal of High Energy Physics
Issue number11
StatePublished - 1 Nov 2004
Externally publishedYes


  • Baryogenesis
  • CP violation
  • Neutrino Physics
  • Supersymmetric Standard Model


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