gSearching for Lepton Flavor Violation Decays

and  at BESh

Guoliang TONG



Using a sample of events, the Beijing Spectrometer experiment

has searched for the decays

and. Four candidates for ,

zero candidate for and one candidate

for  are observed, which consistent

with the estimated background. And upper limits on the branching ratios

of  and of and  

at the 90%C.L. are obtained respectively.