Softly Broken A₄ Symmetry for Nearly Degenerate Neutrino Masses
Ma, Ernest · Rajasekaran, G.
Original · EN
The leptonic Higgs doublet model of neutrino masses is implemented with an A₄ discrete symmetry (the even permutation of 4 objects or equivalently the symmetry of the tetrahedron) which has 4 irreducible representations: 1, 1', 1'', and 3. The resulting spontaneous and soft breaking of A₄ provides a realistic model of charged-lepton masses as well as a nearly degenerate neutrino mass matrix. Phenomenological consequences at and below the TeV scale are discussed.
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