Upper bounds on all R-parity-violating \lambda\lambda'' combinations   from proton stability
  In an R-parity-violating supersymmetric theory, we derive upper bounds on all the \lambda''_{ijk}\lambda_{i'j'k'}-type combinations from the consideration of proton stability, where \lambda''_{ijk} are baryon-number-violating couplings involving three baryonic fields and \lambda_{i'j'k'} are lepton-number-violating couplings involving three leptonic fields. 
Gautam Bhattacharyya, Palash B. Pal