Supersymmetric Leptogenesis with a Light Hidden Sector

Details Supersymmetric Leptogenesis with a Light Hidden Sector Supersymmetric Leptogenesis with a Light Hidden Sector

2010-04-27

arxiv.org/abs/1004.4890v2

JCAP 1007:017,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

27 pages, 6 figures, discussion of LFV in stau decays added, matches the version published in JCAP

Scientific paper

10.1088/1475-7516/2010/07/017

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.

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