On the Behavior of the Effective QCD Coupling alpha_tau(s) at Low Scales

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dc.creatorBrodsky, Stanley J.
dc.creatorMenke, Sven
dc.creatorMerino, Carlos
dc.creatorRathsman, Johan
dc.date2002-12-05
dc.date2003-01-23
dc.date.accessioned2026-07-07T10:33:12Z
dc.date.available2026-07-07T10:33:12Z
dc.descriptionThe hadronic decays of the tau lepton can be used to determine the effective charge alpha_tau(m^2_tau') for a hypothetical tau-lepton with mass in the range 0 < m_tau' < m_tau. This definition provides a fundamental definition of the QCD coupling at low mass scales. We study the behavior of alpha_tau at low mass scales directly from first principles and without any renormalization-scheme dependence by looking at the experimental data from the OPAL Collaboration. The results are consistent with the freezing of the physical coupling at mass scales s = m^2_tau' of order 1 GeV^2 with a magnitude alpha_tau ~ 0.9 +/- 0.1.
dc.description15 pages, 4 figures, submitted to Physical Review D, added references, some text added, no results nor figures changed
dc.identifierhttps://arxiv.org/abs/hep-ph/0212078
dc.identifierhttp://arxiv.org/abs/hep-ph/0212078
dc.identifierPhys.Rev.D67:055008,2003
dc.identifierdoi:10.1103/PhysRevD.67.055008
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/179026
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectHigh Energy Physics - Experiment
dc.subjectHigh Energy Physics - Theory
dc.titleOn the Behavior of the Effective QCD Coupling alpha_tau(s) at Low Scales
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