Leptogenesis in Unified Theories with Type II See-Saw

Details Leptogenesis in Unified Theories with Type II See-Saw Leptogenesis in Unified Theories with Type II See-Saw

2005-07-29

arxiv.org/abs/hep-ph/0507333v1

JHEP 0601 (2006) 117

Physics

High Energy Physics

High Energy Physics - Phenomenology

20 pages, 2 figures

Scientific paper

10.1088/1126-6708/2006/01/117

In some classes of flavour models based on unified theories with a type I see-saw mechanism, the prediction for the mass of the lightest right-handed neutrino is in conflict with the lower bound from the requirement of successful thermal leptogenesis. We investigate how lifting the absolute neutrino mass scale by adding a type II see-saw contribution proportional to the unit matrix can solve this problem. Generically, lifting the neutrino mass scale increases the prediction for the mass of the lightest right-handed neutrino while the decay asymmetry is enhanced and washout effects are reduced, relaxing the lower bound on the mass of the lightest right-handed neutrino from thermal leptogenesis. For instance in classes of unified theories where the lightest right-handed neutrino dominates the type I see-saw contribution, we find that thermal leptogenesis becomes possible if the neutrino mass scale is larger than about 0.15 eV, making this scenario testable by neutrinoless double beta decay experiments in the near future.

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