New constraints on R-parity violation from proton stability

We derive the first bounds on the $(\lambda''_{lmn} \mu_i)$-type combinations from the consideration of proton stability, where $\lambda''_{lmn}$ are baryon-number-violating trilinear couplings and $\mu_i$ are lepton-number-violating bilinear mass parameters in a R-parity-violating supersymmetric theory.