A study of one-prong Tau decays with a charged kaon.

From an analysis of the ionisation energy loss of charged particles selected from 110326 \({\rm e}^+{\rm e}^- \rightarrow \tau^+\tau^-\) candidates recorded by the OPAL detector at \({\rm e}^+{\rm e}^-\) centre-of-mass energies near the Z\(^0\) resonance, we determine the one-prong tau decay branching ratios: