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Title: New ways to leptogenesis with gauged B-L symmetry

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 N~ and N~* producing an asymmetry in N~ over N~*. This can be fully converted into ordinary lepton asymmetry in the decays of 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.
Authors:
; ;
Publication Date:
OSTI Identifier:
1209393
Grant/Contract Number:
FG02-ER46140; FG02-04ER41306
Type:
Published Article
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 681; Journal Issue: 1; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Sponsoring Org:
USDOE; Georgia National Science Foundation (GNSF), Atlanta, GA (United States)
Country of Publication:
Netherlands
Language:
English