Thermal leptogenesis in the canonical seesaw model in supersymmetry suffers from the incompatibility of a generic lower bound on the mass scale of the lightest right-handed neutrino and the upper bound on the reheating temperature of the universe after inflation. This is resolved by adding an extra singlet superfield, with a discrete Z2 symmetry, to the NMSSM (next to minimal supersymmetric standard model). This generic mechanism is applicable to any supersymmetric model for lowering the scale of leptogenesis. © 2007 IOP Publishing Ltd.

Narendra Sahu

Department of Physics

E. Ma

U. Sarkar

Fulltext

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Journal	Journal of Physics G: Nuclear and Particle Physics
ISSN	09543899