NEW BOUNDS ON R-PARITY VIOLATING COUPLINGS

We use information from rare nonleptonic decays of heavy-quark mesons to put new bounds on the magnitudes of certain product combinations of baryon nonconserving R-parity violating couplings in supersymmetric m odels. Product combinations of lepton and baryon nonconserving R-parit y violating couplings are also considered in the light of existing bou nds on nucleon decay. Contrary to popular impression, a few such combi nations are shown to remain essentially unconstrained.