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Leptogenesis in unified theories with type II see-saw

Leptogenesis in unified theories with type II see-saw
Leptogenesis in unified theories with type II see-saw
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.
117
Antusch, Stefan
6a8c0380-78ea-4bcb-afad-4348d84eafba
King, Steve F.
f8c616b7-0336-4046-a943-700af83a1538
Antusch, Stefan
6a8c0380-78ea-4bcb-afad-4348d84eafba
King, Steve F.
f8c616b7-0336-4046-a943-700af83a1538

Antusch, Stefan and King, Steve F. (2006) Leptogenesis in unified theories with type II see-saw. The Journal of High Energy Physics, 1, 117. (doi:10.1088/1126-6708/2006/01/117).

Record type: Article

Abstract

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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Published date: 20 January 2006

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Local EPrints ID: 56980
URI: https://eprints.soton.ac.uk/id/eprint/56980
PURE UUID: ae7e1252-0e97-4472-bcfa-48c65b6abe70

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Date deposited: 13 Aug 2008
Last modified: 13 Mar 2019 20:34

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Author: Stefan Antusch
Author: Steve F. King

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