Measurement of the Strong Coupling Constant and the Vector and Axial-Vector Spectral Functions in Hadronic Tau Decays

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dc.creatorThe OPAL Collaboration
dc.creatoral, K. Ackerstaff et
dc.date1998-08-20
dc.date.accessioned2026-07-07T12:02:24Z
dc.date.available2026-07-07T12:02:24Z
dc.descriptionThe spectral functions of the vector current and the axial-vector current have been measured in hadronic tau decays using the OPAL detector at LEP. Within the framework of the Operator Product Expansion a simultaneous determination of the strong coupling constant alpha_s, the non-perturbative operators of dimension 6 and 8 and of the gluon condensate has been performed. Different perturbative descriptions have been compared to the data. The Contour Improved Fixed Order Perturbation Theory gives alpha_s(mtau**2) = 0.348 +- 0.009 +- 0.019 at the tau-mass scale and alpha_s(mz**2) = 0.1219 +- 0.0010 +- 0.0017 at the Z-mass scale. The values obtained for alpha_s(mz**2) using Fixed Order Perturbation Theory or Renormalon Chain Resummation are 2.3% and 4.1% smaller, respectively. The running of the strong coupling between s_0 ~1.3 GeV**2 and s_0 = mtau**2 has been tested from direct fits to the integrated differential hadronic decay rate R_tau. A test of the saturation of QCD sum rules at the tau-mass scale has been performed.
dc.description35 pages, LaTeX, 27 eps figures included, submitted to European Physical Journal C
dc.identifierhttps://arxiv.org/abs/hep-ex/9808019
dc.identifierhttp://arxiv.org/abs/hep-ex/9808019
dc.identifierEur.Phys.J.C7:571-593,1999
dc.identifierdoi:10.1007/s100529901061
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/207426
dc.subjectHigh Energy Physics - Experiment
dc.titleMeasurement of the Strong Coupling Constant and the Vector and Axial-Vector Spectral Functions in Hadronic Tau Decays
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