New constraints on R-parity violation from proton stability

We derive stringent upper bounds on all the $({\lambda }_{ijk}^{\mathrm{\prime }\mathrm{\prime }}{\mu }_l)$-type combinations from the consideration of proton stability, where ${\lambda }_{ijk}^{\mathrm{\prime }\mathrm{\prime }}$ are baryon-number-violating trilinear couplings and ${\mu }_l$ are lepton-number-violating bilinear mass parameters in a R-parity-violating supersymmetric theory.