ep - p h / 99 08 43 6 v 1 2 3 A ug 1 99 9 SO ( 3 ) Gauge model for neutrino masses and oscillations
نویسنده
چکیده
I mainly describe neutrino masses and oscillations in the gauge model with SO(3) F lepton flavor symmetry and with two Higgs triplets. It is shown how the maximal mixing between ν µ and ν τ neutrinos comes out naturally after spontaneous breaking of the symmetry. The nearly two-flavor mixing scenario is resulted naturally from an approximate permutation symmetry between the two Higgs triplets. The hierarchy between the neutrino mass-squared differences, which is needed for reconciling both solar and atmospheric neutrino data, leads to an almost maximal mixing between ν e and ν µ neutrinos. Thus the model favors the intriguing bi-maximal mixing scenario. The three Majorana neutrino masses are allowed to be nearly degenerate and large enough to play a significant cosmological role. The model can also lead to interesting phenomena on lepton-flavor violations via the SO(3) F gauge interactions.
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