Neutrino Mass Models

Physics – High Energy Physics – High Energy Physics - Phenomenology

Scientific paper

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References added, typos corrected. 61 pages, 4 figures, Review article submitted for publication in Reports on Progress in Phy

Scientific paper

10.1088/0034-4885/67/2/R01

This is a review article about neutrino mass models, particularly see-saw models involving three active neutrinos which are capable of describing both the atmospheric neutrino oscillation data, and the large mixing angle MSW solar solution, which is now uniquely specified by recent data. We briefly review the current experimental status, show how to parametrise and construct the neutrino mixing matrix, and present the leading order neutrino Majorana mass matrices. We then introduce the see-saw mechanism, and discuss a natural application of it to current data using the sequential dominance mechanism, which we compare to an early proposal for obtaining large mixing angles. We show how both the Standard Model and the Minimal Supersymmetric Standard Model may be extended to incorporate the see-saw mechanism, and show how the latter case leads to the expectation of lepton flavour violation. The see-saw mechanism motivates models with additional symmetries such as unification and family symmetry models, and we tabulate some possible models, before focussing on two particular examples based on SO(10) grand unification and either U(1) or SU(3) family symmetry as specific examples. The article contains extensive appendices which include techniques for analytically diagonalising different types of mass matrices involving two large mixing angles and one small mixing angle, to leading order in the small mixing angle.

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