Constraints on R parity and B violating couplings in gauge-mediated   supersymmetry breaking models
  We consider the proton decay involving a light gravitino or axino in gauge-mediated supersymmetry breaking models to derive constraints on the $R$ parity and baryon number violating Yukawa couplings. Bounds on all nine coupling constants are obtained by considering the decay amplitudes at one-loop order. 
Kiwoon Choi, Kyuwan Hwang and Jae Sik Lee