The problem of neutrino masses in extensions of the Standard Model

Details The problem of neutrino masses in extensions of the Standard Model The problem of neutrino masses in extensions of the Standard Model

2001-07-20

arxiv.org/abs/hep-ph/0107220v1

Int.J.Mod.Phys.A16:5101-5200,2001

Physics

High Energy Physics

High Energy Physics - Phenomenology

140 pages, 6 figures; based on PhD thesis work; accepted by Int. Jour. of Mod. Phys. A

Scientific paper

10.1142/S0217751X01005456

We review the problem of neutrino masses and mixings in the context of Grand Unified Theories. After a brief summary of the present experimental status of neutrino physics, we describe how the see-saw mechanism can automatically account for the large atmospheric mixing angle. We provide two specific examples where this possibility is realized by means of a flavour symmetry. We then review in some detail the various severe problems which plague minimal GUT models (like the doublet-triplet splitting and proton-decay) and which force to investigate the possibility of constructing more elaborate but realistic models. We then show an example of a quasi-realistic SUSY SU(5) model which, by exploiting the crucial presence of an abelian flavour symmetry, does not require any fine-tuning and predicts a satisfactory phenomenology with respect to coupling unification, fermion masses and mixings and bounds from proton decay.

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