Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-01-30
Phys.Lett.B558:92-102,2003
Physics
High Energy Physics
High Energy Physics - Phenomenology
14 pages, 4 figures
Scientific paper
10.1016/S0370-2693(03)00219-3
We study the generation of neutrino masses in the $SU(3)_W$ electroweak unified theory in $M_4\times S_1/(Z_2\times Z'_2)$ spacetime. By appropriate orbifolding, the bulk symmetry $SU(3)_W$ is broken into $SU(2)_L \times U(1)_Y$ at one of the fixed points, where the quarks reside. The leptons form $SU(3)_W$ triplets, localized at the other symmetric fixed point. The fermion masses arise from the bulk Higgs sector containing a triplet and an anti-sextet. We construct neutrino Majorana masses via 1-loop quantum corrections by adding a parity odd bulk triplet scalar. No right-handed neutrino is needed. The neutrino mass matrix is of the inverted hierarchy type. We show that the model can easily accommodate the bi-large mixing angle solution favored by the recent neutrino experiments without much fine tuning of parameters. The constraints from $\mu\ra 3e$ transition and neutrinoless double beta decays are discussed.
Chang Chia-Hung V.
Chang We-Fu
Ng John N.
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