Search for Chargino and neutralino Production at sqrt(s)=189 GeV at LEP        
  
A search for charginos and neutralinos,                                        
predicted by supersymmetric theories, is                                       
performed using a data sample of 182.1 inverse pico-barns                      
taken at a centre-of-mass energy of 189 GeV                                    
with the OPAL detector at LEP.                                                 
No evidence for chargino or neutralino production is found.                    
Upper limits on chargino and neutralino pair production                        
cross-sections are obtained                                                    
as a function of the chargino mass,                                            
the lightest neutralino mass                                                   
and the second lightest neutralino mass.                                       
Limits on the chargino and neutralino masses                                   
are inferred                                                                   
within the Constrained Minimal Supersymmetric Standard Model                   
framework.                                                                     
  
 Parallel session :11                  
 Plenary  session :7a