New Ways to Soft Leptogenesis | Zendy

Yuval Grossman | Zendy; Tamar Kashti | Zendy; Yosef Nir | Zendy; Esteban Roulet | Zendy

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New Ways to Soft Leptogenesis

Author(s) -

Yuval Grossman,

Tamar Kashti,

Yosef Nir,

Esteban Roulet

Publication year - 2004

Publication title -

journal of high energy physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.998

H-Index - 261

eISSN - 1126-6708

pISSN - 1029-8479

DOI - 10.1088/1126-6708/2004/11/080

Subject(s) - leptogenesis , particle physics , physics , majorana , cp violation , supersymmetry breaking , neutrino , lepton number , baryogenesis , supersymmetry , mixing (physics) , neutrino oscillation , gaugino , lepton , nuclear physics , quantum mechanics , electron

Soft supersymmetry breaking terms involving heavy singlet sneutrinos providenew sources of lepton number violation and of CP violation. In addition to theCP violation in mixing, investigated previously, we find that `softleptogenesis' can be generated by CP violation in decay and in the interferenceof mixing and decay. These additional ways to leptogenesis can be significantfor a singlet neutrino Majorana mass that is not much larger than thesupersymmetry breaking scale, $M < 100 m_{SUSY}$. In contrast to CP violationin mixing, for some of these new contributions the sneutrino oscillation ratecan be much faster than the decay rate, so that the bilinear scalar term neednot be smaller than its natural scale.Comment: 18 pages, 3 figure

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