BARYOGENESIS IN A SUPERSYMMETRIC MODEL WITH Z(3) MATTER PARITY

We analyze a scenario for baryogenesis at low temperature (approximate ly 1 TeV) in supersymmetric extensions of the standard model. These ex tensions contain gauge singlets and discrete symmetries that suppress unwanted baryon- and lepton-number violation, and offer a framework to accommodate nonstandard neutrino physics. In our scenario, the decay of the lightest supersymmetric particle generates a net lepton number that is subsequently converted, via anomalous electroweak processes, i nto baryon number. We find that this possibility could be realized in models incorporating a Z3 discrete symmetry, although it requires a sc alar singlet as the lightest supersymmetric particle and a somewhat co mplicated pattern of couplings and fields in the singlet sector.