Soft Leptogenesis
High Energy Physics - Phenomenology
2010-04-05 v2
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
Cite
@article{arxiv.hep-ph/0308031,
title = {Soft Leptogenesis},
author = {Giancarlo D'Ambrosio and Gian F. Giudice and Martti Raidal},
journal= {arXiv preprint arXiv:hep-ph/0308031},
year = {2010}
}
Comments
13 pages, 5 figures, uses axodraw.sty