Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2000-12-23
Phys.Lett. B506 (2001) 131-139
Physics
High Energy Physics
High Energy Physics - Phenomenology
LaTeX, 15 pages, 3 eps-files. Some discussion has been added to specify the extra U(1) symmetry
Scientific paper
10.1016/S0370-2693(01)00413-0
We consider the explanation of both data of the atmospheric neutrino and the solar neutrino by the neutrino mass matrix derived from the mixing of neutrinos and gauginos in the extended MSSM with an extra U(1) gauge symmetry. This scenario directly relates the neutrino mass to supersymmetry. The structure of the mass hierarchy and the mixing is determined only by the extra U(1)-charge of neutrinos. Although the model is rather simple, it may be able to realize both the small and large mixing angle solutions for the solar neutrino problem. In particular, the large mixing angle MSW solution for the solar neutrino problem can be easily realized. We discuss the relation between the extra U(1)-charge and four solutions for the solar neutrino problem.
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