Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1993-10-12
Phys.Rev. D49 (1994) 3783-3786
Physics
High Energy Physics
High Energy Physics - Phenomenology
standard LATEX, 6 pages, 2 figures available from the authors, report No. CMU-HEP93-20 and DOE-ER/40682-45
Scientific paper
10.1103/PhysRevD.49.3783
In the extension of the Dimopoulos--Hall--Raby model of the fermion mass matrices to the neutrino sector, there is an entry in the up-quark and neutrino Dirac mass matrices which can be assumed to arise from the Yukawa coupling of a {\bf 120}, instead of a {\bf 10} or a {\bf 126}, of SO(10). Although this assumption leads to an extra undetermined complex parameter in the model, the resulting lepton mixing matrix exhibits the remarkable feature that the $ \nu_{\tau} $ does not mix with the other two neutrinos. Making a reasonable assumption about the extra parameter, we are able to fit the large-mixing-angle MSW solution of the solar-neutrino problem, and we obtain $ m_{\nu_{\tau}} \sim 10 $ eV, the right mass range to close the Universe. Other possibilities for explaining the solar-neutrino deficit are also discussed.
Lavoura Luis
Silva Joao P.
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