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)′ × 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 ic can naturally decouple from the low energy U(1)′, avoiding cosmological constraints. A variant version can generate large Majorana masses for Nic and an ordinary seesaw. 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 nonrenormalizable terms. We also study models involving the double-seesaw mechanism, in which heavy Majorana masses for Nic 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.
|Original language||English (US)|
|Journal||Physical Review D - Particles, Fields, Gravitation and Cosmology|
|State||Published - Jan 2005|
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics
- Physics and Astronomy (miscellaneous)