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The strong coupling from tau decays without prejudice

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arxiv 1212.0091 v2 pith:TFBYQ3AV submitted 2012-12-01 hep-ph hep-exhep-lat

The strong coupling from tau decays without prejudice

classification hep-ph hep-exhep-lat
keywords alphacouplingdecaysstrongdatahadronicperturbationtheory
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We review our recent determination of the strong coupling \alpha_s from the OPAL data for non-strange hadronic tau decays. We find that \alpha_s(m^2_\tau) =0.325+-0.018 using fixed-order perturbation theory, and \alpha_s(m^2_\tau)=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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