Search for Baryon and Lepton Number Violating Z0 Decays                        
  
Using data collected with the OPAL detector                                    
at LEP, we have searched for the                                               
decays of Z to a proton plus an electron or                                    
protron plus a muon.                                                           
These would                                                                    
violate the conservation of the baryon-number B,                               
lepton-number L and the fermion-number n = (B+L).                              
No evidence for such decays has been found, and the                            
95% confidence level upper limits                                              
on the respective partial widths                                               
are found to be 4.6 and 4.4 keV.                                               
  
 Parallel session :11                  
 Plenary  session :7a