Soft Leptogenesis

Details Soft Leptogenesis Soft Leptogenesis

2003-08-04

arxiv.org/abs/hep-ph/0308031v2

Phys.Lett. B575 (2003) 75-84

Physics

High Energy Physics

High Energy Physics - Phenomenology

13 pages, 5 figures, uses axodraw.sty

Scientific paper

10.1016/j.physletb.2003.09.037

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.

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