Tau decays with Neutral Kaons                                                  
  
The branching ratio of the tau lepton to a neutral kaon meson                  
is measured from a sample                                                      
of approximately 200,000 tau decays recorded by the OPAL detector              
at centre-of-mass energies near the Z0 resonance.                              
The measurement is based on two samples which identify                         
one-prong tau decays with K(long) and K(short) mesons.                         
The combined branching ratios are measured to be                               
Br(tau -> pi- K0)          = (9.33 +/- 0.68 +/- 0.49}) x 10^{-3}               
Br(tau -> pi- K0 (>=1pi0)) = (3.24 +/- 0.74 +/- 0.66}) x 10^{-3}}              
Br(tau -> K- K0 (>=0pi0))  = (3.30 +/- 0.55 +/-m0.39}) x 10^{-3}               
where the first error is statistical and the second systematic.                
  
 Parallel session :7                   
 Plenary  session :3