Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2006-03-14
Phys.Rev.D73:053006,2006
Physics
High Energy Physics
High Energy Physics - Phenomenology
21 pages, 5 figures
Scientific paper
10.1103/PhysRevD.73.053006
We investigate a simple model of neutrino mass based on SU(3)_C X SU(3)_L X U(1)_X gauge unification. The Yukawa coupling of the model has automatic lepton-number symmetry which is broken only by the self-couplings of the Higgs boson. At tree level, neutrino spectrum contains three Dirac fermions, one massless and two degenerate in mass. At the two loop-level, neutrinos obtain Majorana masses and correct the tree-level result which naturally gives rise to an inverted hierarchy mass pattern and interesting mixing which can fit the current data with minor fine-tuning. In another scenarios, one can pick the scales such that the loop-induced Majorana mass matrix is bigger than the Dirac one and thus reproduces the usual seesaw mechanism.
Chang Darwin
Long Hoang Ngoc
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