Strong coupling constant from τ decay within renormalization scheme invariant treatment
J. G. Koerner, F. Krajewski, A. A. Pivovarov
Abstract
We extract a numerical value for the strong coupling constant αs from the τ-lepton decay rate into nonstrange particles. A new feature of our procedure is the explicit use of renormalization scheme invariance in analytical form in order to perform the actual analysis in a particular renormalization scheme. For the reference coupling constant in the -scheme we obtain αs(Mτ)= 0.3184 0.0060exp which corresponds to s(MZ)= 0.1184 0.0007exp 0.0006hq mass. This new numerical value is smaller than the standard value from τ-data quoted in the literature and is closer to s(MZ)-values obtained from high energy experiments.
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