Supersymmetric leptogenesis with a light hidden sector
- Center for Theoretical Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts (United States)
- Physik-Department T30d, Technische Universität München, James-Franck-Straße, 85748 Garching (Germany)
- Deutsches Elektronen-Synchrotron DESY Hamburg, Notkestraße 85, 22603 Hamburg (Germany)
Supersymmetric scenarios incorporating thermal leptogenesis as the origin of the observed matter-antimatter asymmetry generically predict abundances of the primordial elements which are in conflict with observations. In this paper we propose a simple way to circumvent this tension and accommodate naturally thermal leptogenesis and primordial nucleosynthesis. We postulate the existence of a light hidden sector, coupled very weakly to the Minimal Supersymmetric Standard Model, which opens up new decay channels for the next-to-lightest supersymmetric particle, thus diluting its abundance during nucleosynthesis. We present a general model-independent analysis of this mechanism as well as two concrete realizations, and describe the relevant cosmological and astrophysical bounds and implications for this dark matter scenario. Possible experimental signatures at colliders and in cosmic-ray observations are also discussed.
- OSTI ID:
- 22273369
- Journal Information:
- Journal of Cosmology and Astroparticle Physics, Vol. 2010, Issue 07; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
- Country of Publication:
- United States
- Language:
- English
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