Abstract
Form a sample of about 75000 τ decays measured in the ALEPH detector, 1-prong charged kaon decays are identified by the dE/ dx measurement in the central detector. The resulting branching ratios for the inclusive and exclusive modes are: B( τ → ν τ K − ≥ 0 π 0 ≥ 0 K 0) = (1.60±0.07±0.12)%, B( τ → ν τ K − = (0.64±0.05±0.05)%, B( τ → ν τ − π 0 = (0.53±0.05±0.07)% and B( τ → ν τ K − π 0 π 0) = (0.04±0.03±0.02)%. Exclusive modes are corrected for measured K L 0 production. The rate for τ → ν τ K − agrees well with the prediction based on τ - μ universality.
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