New constraints on lepton nonconserving R-parity violating couplings

Strong upper bounds are derived on certain product combinations of lepton nonconserving couplings in the minimal sypersymmetric standard model with explicit R-parity violation. The input is information from rare leptonic decays of the long-lived neutral kaon, the muon and the tau as well as from the mixings of neutral K- and B-mesons. One of these bounds is comparable and another superior to corresponding ones obtained recently from neutrinoless double beta decay.