A study of spin alignment of rho(770)+/- and                                   
omega(782) mesons in hadronic Z0 decays                                        
  
The helicity density matrix elements, rho(0,0), of rho(770)+/- and             
omega(782) mesons produced in Z0 decays have been measured using               
the OPAL detector at LEP. Over the measured meson energy range,                
the values are compatible with 1/3, corresponding to a statistical             
mix of helicity -1, 0 and +1 states. For the highest accessible                
scaled energy range 0.3 < x_E < 0.6, the measured rho(0,0) values              
are 0.373+/-0.052 and 0.142+/-0.114 for the rho and omega mesons               
respectively. These results are compared to measurements of other              
vector mesons.                                                                 
  
 Parallel session :2                   
 Plenary  session :12