Abstract
The theoretical predictions for the semi-inclusive hadronic τ decays into an even/odd number of pions (and kaons) are updated, and compared with the corresponding sums of exclusive τ-decay modes. The value of α s ( M 2 τ ) obtained from these semi-inclusive widths agree with the one obtained from the total inclusive hadronic width. The experimental e + e −→hadrons data are also used to perform additional tests in the vector sector. Using the e + e − data and varying the value of M τ , we show that there is a good agreement among the results obtained at different mass scales. This work has been supported in part by CICYT (Spain) under grant No. AEN90-0040.
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