Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-11-30
Phys.Rev. D71 (2005) 015012
Physics
High Energy Physics
High Energy Physics - Phenomenology
Latex, 22 pages, 1 table, references added, version to appear in PRD
Scientific paper
10.1103/PhysRevD.71.015012
We consider various possibilities for generating neutrino masses in supersymmetric models with an additional U(1)' gauge symmetry. One class of models involves two extra U(1)' x U(1)'' gauge symmetries, with U(1)'' breaking at an intermediate scale and yielding small Dirac masses through high-dimensional operators. The right-handed neutrinos N^c_i can naturally decouple from the low energy U(1)', avoiding cosmological constraints. A variant version can generate large Majorana masses for N^c_i and an ordinary see-saw. We secondly consider models with a pair of heavy triplets which couple to left-handed neutrinos. After integrating out the heavy triplets, a small neutrino Majorana mass matrix can be generated by the induced non-renormalizable terms. We also study models involving the double-see-saw mechanism, in which heavy Majorana masses for N^c_i are associated with the TeV-scale of U(1)' breaking. We give the conditions to avoid runaway directions in such models and discuss simple patterns for neutrino masses.
Kang Junhai
Langacker Paul
Li Tiancheng
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