Soft Leptogenesis

Preprint

21 August 2003

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.hep-ph/0308031

Abstract

We study ``soft leptogenesis'', a new mechanism of leptogenesis which does not require flavour mixing among the right-handed neutrinos. Supersymmetry soft-breaking terms give a small mass splitting between the CP-even and CP-odd right-handed sneutrino states of a single generation and provide a CP-violating phase sufficient to generate a lepton asymmetry. The mechanism is successful if the lepton-violating soft bilinear coupling is unconventionally (but not unnaturally) small. The values of the right-handed neutrino masses predicted by soft leptogenesis can be low enough to evade the cosmological gravitino problem.

Keywords

SOFT LEPTOGENESIS
HANDED NEUTRINOS
RIGHT HANDED
CP VIOLATING
ASYMMETRY
NEUTRINOS
LEPTON

All Related Versions

Version 1, 2003-08-04, ArXiv
Version 2, 2003-08-21, ArXiv
Published version: Physics Letters B, 575 (1-2), 75.

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