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arxiv: 1212.0091 · v2 · pith:TFBYQ3AVnew · submitted 2012-12-01 · ✦ hep-ph · hep-ex· hep-lat

The strong coupling from tau decays without prejudice

classification ✦ hep-ph hep-exhep-lat
keywords alphacouplingdecaysstrongdatahadronicperturbationtheory
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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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