CHARGED KAON IDENTIFICATION WITH THE RICH IN TAU-DECAYS

Kaon production in the decay of the tau lepton has been studied with t he data collected by the DELPHI detector at LEP. Charged kaons were id entified by the DELPHI barrel ring imaging Cherenkov detector with two techniques, ''ring'' and ''veto'' identification. Both inclusive and exclusive branching ratios of charged kaon production in single-prong tau decay were measured. The kaon identification techniques were exten ded to the case of multi-prong tau decays, which provides the possibil ity to measure the kaon production in multi-prong tau decay and the ta u neutrino mass.