Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-08-07
Phys.Rev.D77:113009,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
15 pages, only typos in table 1 corrected in this replaced version
Scientific paper
10.1103/PhysRevD.77.113009
Majorana features of neutrinos and SO(3) gauge symmetry of three families enable us to construct a gauge model of neutrino for understanding naturally the observed smallness of neutrino masses and the nearly tri-bimaximal neutrino mixing when combining together with the mechanism of approximate global U(1) family symmetry. The vacuum structure of SO(3) symmetry breaking is found to play an important role. The mixing angle $\theta_{13}$ and CP-violating phases governed by the vacuum of spontaneous symmetry breaking are in general non-zero and testable experimentally at the allowed sensitivity. The model predicts the existence of vector-like SO(3) triplet charged leptons and vector-like SO(3) triplet Majorana neutrinos as well as SO(3) tri-triplet Higgs bosons, some of them can be light and explored at the colliders LHC and ILC.
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