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High Energy Physics - Phenomenology

arXiv:hep-ph/0507333 (hep-ph)
[Submitted on 29 Jul 2005]

Title:Leptogenesis in Unified Theories with Type II See-Saw

Authors:Stefan Antusch, Steve F. King
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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.
Comments: 20 pages, 2 figures
Subjects: High Energy Physics - Phenomenology (hep-ph)
Report number: SHEP/0524
Cite as: arXiv:hep-ph/0507333
  (or arXiv:hep-ph/0507333v1 for this version)
  https://doi.org/10.48550/arXiv.hep-ph/0507333
Journal reference: JHEP 0601 (2006) 117
Related DOI: https://doi.org/10.1088/1126-6708/2006/01/117

Submission history

From: Stefan Antusch [view email]
[v1] Fri, 29 Jul 2005 16:16:03 UTC (143 KB)
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