Measuring $α_s(Q^2)$ in $τ$ Decays

Details Measuring $α_s(Q^2)$ in $τ$ Decays Measuring $α_s(Q^2)$ in $τ$ Decays

1996-05-10

arxiv.org/abs/hep-ph/9605274v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, 7 figures appended, to appear in the Proceedings of Les Rencontres de Physique de la Vall\'ee d'Aoste (La Thuile, It

Scientific paper

The decay rate of the $\tau$ lepton into hadrons of invariant mass smaller than $Q\gg\Lambda_{\rm QCD}$ can be calculated in QCD using the OPE. Using experimental data on the hadronic mass distribution, the running coupling constant $\alpha_s(Q^2)$ is extracted in the range $0.85~\mbox{GeV}

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