Is spontaneous breaking of R-parity feasible in minimal low-energy supergravity? |
| |
Authors: | B Gato J León J Pérez-Mercader M Quirós |
| |
Institution: | Instituto de Estructura de la Materia, Serrano 119, 28006 Madrid, Spain |
| |
Abstract: | Spontaneous violation of lepton number without breaking Lorentz invariance can, in principle, be incorporated in models with softly broken supersymmetry. We study the situation for minimal low-energy supergravity models coming from a GUT (hence not having hierarchy destabilizing light singlets) and where the SU(2) × U(1) breaking is radiative. It is found that for this type of model, R-parity breaking requires either too heavy a top quark for a realistic superpartner spectrum or too light a superpartner spectrum for a realistic top quark, making the spontaneous violation of lepton number in the third generation incompatible with present experimental data. We do not discard the possibility of having it in a fourth, heavier, generation. |
| |
Keywords: | |
本文献已被 ScienceDirect 等数据库收录! |
|