Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-01-08
Phys.Lett.B681:37-43,2009
Physics
High Energy Physics
High Energy Physics - Phenomenology
14 pp, LaTeX, 2 eps figures, typos fixed
Scientific paper
10.1016/j.physletb.2009.09.036
We show that in supersymmetric models with gauged B-L symmetry, there is a new source for cosmological lepton asymmetry. The Higgs bosons responsible for B-L gauge symmetry breaking decay dominantly into right-handed sneutrinos \tilde{N} and \tilde{N}* producing an asymmetry in \tilde{N} over \tilde{N}*. This can be fully converted into ordinary lepton asymmetry in the decays of \tilde{N}. In simple models with gauged B-L symmetry we show that resonant/soft leptogenesis is naturally realized. Supersymmetry guarantees quasi-degenerate scalar states, while soft breaking of SUSY provides the needed CP violation. Acceptable values of baryon asymmetry are obtained without causing serious problems with gravitino abundance.
Babu K. S.
Meng Yanzhi
Tavartkiladze Zurab
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