From Minimal to Realistic Supersymmetric SU(5) Grand Unification

Details From Minimal to Realistic Supersymmetric SU(5) Grand Unification From Minimal to Realistic Supersymmetric SU(5) Grand Unification

2000-07-24

arxiv.org/abs/hep-ph/0007254v1

JHEP 0011 (2000) 040

Physics

High Energy Physics

High Energy Physics - Phenomenology

20 pages, LATEX, 2 figures; uses psfig.sty

Scientific paper

10.1088/1126-6708/2000/11/040

We construct and discuss a "realistic" example of SUSY SU(5) GUT model, with an additional U(1) flavour symmetry, that is not plagued by the need of large fine tunings, like those associated with doublet-triplet splitting in the minimal model, and that leads to an acceptable phenomenology. This includes coupling unification with a value of alpha_s(m_Z) in much better agreement with the data than in the minimal version, an acceptable hierarchical pattern for fermion masses and mixing angles, also including neutrino masses and mixings, and a proton decay rate compatible with present limits (but the discovery of proton decay should be within reach of the next generation of experiments). In the neutrino sector the preferred solution is one with nearly maximal mixing both for atmospheric and solar neutrinos.

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