Neutrino mass models and leptogenesis
Neutrino mass models and leptogenesis
In this talk we show how a natural neutrino mass hierarchy can follow from the type I see-saw mechanism, and a natural neutrino mass degeneracy from the type II see-saw mechanism, where the bi-large mixing angles can arise from either the neutrino or charged lepton sector.We summarize the phenomenological implications of such natural models, and discuss the model building applications of the approach, focussing on the SU(3) × SO(10) model. We also show that in such type II models the leptogenesis asymmetry parameter becomes proportional to the neutrino mass scale, in sharp contrast to the type I case, which leads to an upper bound on the neutrino mass scale, allowing lighter right-handed neutrinos and hence making leptogenesis more consistent with the gravitino constraints in supersymmetric models.
178-184
King, S.F.
f8c616b7-0336-4046-a943-700af83a1538
2005
King, S.F.
f8c616b7-0336-4046-a943-700af83a1538
King, S.F.
(2005)
Neutrino mass models and leptogenesis.
Physica Scripta, T121., .
Abstract
In this talk we show how a natural neutrino mass hierarchy can follow from the type I see-saw mechanism, and a natural neutrino mass degeneracy from the type II see-saw mechanism, where the bi-large mixing angles can arise from either the neutrino or charged lepton sector.We summarize the phenomenological implications of such natural models, and discuss the model building applications of the approach, focussing on the SU(3) × SO(10) model. We also show that in such type II models the leptogenesis asymmetry parameter becomes proportional to the neutrino mass scale, in sharp contrast to the type I case, which leads to an upper bound on the neutrino mass scale, allowing lighter right-handed neutrinos and hence making leptogenesis more consistent with the gravitino constraints in supersymmetric models.
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Submitted date: 24 November 2004
Published date: 2005
Identifiers
Local EPrints ID: 57369
URI: http://eprints.soton.ac.uk/id/eprint/57369
ISSN: 0031-8949
PURE UUID: 7a227ea9-afa0-4d1b-a74d-8ddbd23b2156
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Date deposited: 14 Aug 2008
Last modified: 11 Dec 2021 17:52
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