The strong coupling from tau decays without prejudice
Abstract
We review our recent determination of the strong coupling αs from the OPAL data for non-strange hadronic tau decays. We find that αs(m2τ) =0.325+-0.018 using fixed-order perturbation theory, and αs(m2τ)=0.347+-0.025 using contour-improved perturbation theory. At present, these values supersede any earlier determinations of the strong coupling from hadronic tau decays, including those from ALEPH data.
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