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dc.contributor.authorGarayoa, Juliaen_US
dc.contributor.authorGonzález García, M.ª Concepciónen_US
dc.contributor.authorRius, Nuriaen_US
dc.identifier.citationJournal of High Energy Physics 2: 021 (2007)en_US
dc.description29 pages, 1 figure.-- ISI Article Identifier: 000245078200021.-- ArXiv pre-print available at: http://arxiv.org/abs/hep-ph/0611311en_US
dc.description.abstractWe consider leptogenesis induced by soft supersymmetry breaking terms ("soft leptogenesis"), in the context of the inverse seesaw mechanism. In this model there are lepton number (L) conserving and L-violating soft supersymmetry-breaking B-terms involving the singlet sneutrinos which, together with the - generically small - L-violating parameter responsible of the neutrino mass, give a small mass splitting between the four singlet sneutrino states of a single generation. In combination with the trilinear soft supersymmetry breaking terms they also provide new CP violating phases needed to generate a lepton asymmetry in the singlet sneutrino decays. We obtain that in this scenario the lepton asymmetry is proportional to the L-conserving soft supersymmetry-breaking B-term, and it is not suppressed by the L-violating parameters. Consequently we find that, as in the standard see-saw case, this mechanism can lead to sucessful leptogenesis only for relatively small value of the relevant soft bilinear coupling. The right-handed neutrino masses can be sufficiently low to elude the gravitino problem. Also the corresponding Yukawa couplings involving the lightest of the right-handed neutrinos are constrained to be Σ|Y-1k|^2 less than or similar to 10^(-7) which generically implies that the neutrino mass spectrum has to be strongly hierarchical.en_US
dc.description.sponsorshipJ.G. is supported by a MEC-FPU Spanish grant. This work is supported in part by National Science Foundation grant PHY-0354776, by the EC RTN network MRTN-CT-2004-503369, by Spanish grants FPA-2004-00996 and FPA2005-01269 and by Generalitat Valenciana under grants ACOMP06/098 and GV05/264.-
dc.format.extent2373 bytes-
dc.publisherInternational School for Advanced Studiesen_US
dc.publisherInstitute of Physics Publishing-
dc.subjectLepton flavor violationen_US
dc.subjectRight symmetry-breakingen_US
dc.subjectNeutral heavy leptonsen_US
dc.subjectMassless neutrinosen_US
dc.subjectCP violationen_US
dc.subjectMuon decaysen_US
dc.subjectBeyond Standard Modelen_US
dc.subjectNeutrino physicsen_US
dc.titleSoft leptogenesis in the inverse seesaw modelen_US
dc.description.peerreviewedPeer revieweden_US
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