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Soft leptogenesis in the inverse seesaw model
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| dc.contributor.author | Garayoa, Julia | |
| dc.contributor.author | González García, Mª Concepción | |
| dc.contributor.author | Rius Dionis, Nuria | |
| dc.date.accessioned | 2015-03-03T09:16:44Z | |
| dc.date.available | 2015-03-03T09:16:44Z | |
| dc.date.issued | 2007 | |
| dc.identifier.citation | Garayoa, Julia González García, Mª Concepción Rius Dionis, Nuria 2007 Soft leptogenesis in the inverse seesaw model Journal of High Energy Physics 2007 2 021-1 021-15 | |
| dc.identifier.uri | http://hdl.handle.net/10550/42580 | |
| dc.description.abstract | We 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 Sigma vertical bar Y-1k vertical bar(2) less than or similar to 10(-7) which generically implies that the neutrino mass spectrum has to be strongly hierarchical | |
| dc.language.iso | eng | |
| dc.relation.ispartof | Journal of High Energy Physics, 2007, vol. 2007, num. 2, p. 021-1-021-15 | |
| dc.subject | Física | |
| dc.title | Soft leptogenesis in the inverse seesaw model | |
| dc.type | journal article | es_ES |
| dc.date.updated | 2015-03-03T09:16:45Z | |
| dc.identifier.doi | 10.1088/1126-6708/2007/02/021 | |
| dc.identifier.idgrec | 043129 | |
| dc.rights.accessRights | open access | es_ES |
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