NEUTRINO MASS EFFECTS IN A MINIMALLY EXTENDED SUPERSYMMETRIC STANDARDMODEL

We consider an extension of the supersymmetric standard model which in cludes singlet Higgs superfield representations (in three generations) to generate neutrino masses via the see-saw mechanism. The resulting theory may then exhibit R-parity violation in the couplings of the sin glets, inducing R-parity violating effective interactions among the st andard model superfields, as well as inducing decay of the lightest ne utralino, which otherwise would compose a stable LSP. We compute the r ates for the resulting neutralino decays, depending on the particular superpotential couplings responsible for the violation of R-parity. We compare to astrophysical constraints on the decay of massive particle s.