Leptogenesis, neutrino masses and gauge unification

Details Leptogenesis, neutrino masses and gauge unification Leptogenesis, neutrino masses and gauge unification

2004-03-19

arxiv.org/abs/hep-ph/0403209v2

JHEP 0408 (2004) 027

Physics

High Energy Physics

High Energy Physics - Phenomenology

11pages, 7 figures. v2: definition of the lepton asymmetry corrected, small numerical changes for the baryon number, conclusio

Scientific paper

10.1088/1126-6708/2004/08/027

Leptogenesis is considered in its natural context where Majorana neutrinos fit in a gauge unification scheme and therefore couple to some extra gauge bosons. The masses of some of these gauge bosons are expected to be similar to those of the heavy Majorana particles, and this can have important consequences for leptogenesis. In fact, the effect can go both ways. Stricter bounds are obtained on one hand due to the dilution of the CP-violating effect by new decay and scattering channels, while, in a re-heating scheme, the presence of gauge couplings facilitates the re-population of the Majorana states. The latter effect allows in particular for smaller Dirac couplings.

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