TAU-DECAYS INTO KAONS

Predictions for semi-leptonic decay rates of the tau lepton into two m eson final states K(-)pi(0) nu(tau), K-0 pi(-)nu(tau) K-0 K(-)nu tau, and three meson final states K(-)pi(-) K(+)nu(tau), K-0 pi(-) K-0 nu(t au), K-S pi(-)K(S) nu(tau), K-S pi(-)K(L) nu(tau), K-L pi(-)K(L) nu(ta u), K-pi(0) K-0 nu(tau), pi(0) pi(0) K(-)nu(tau), K(-)pi(-)pi(+)nu(tau ),pi(-) K-0 pi(0) nu(tau) are derived. The hadronic matrix elements ar e expressed in terms of form factors, which can be predicted by chiral Lagrangians supplemented by informations about all possible low-lying resonances in the different channels. Isospin symmetry relations amon g the different final states are carefully taken into account. The cal culated branching ratios are compared with measured decay rates where data are available.