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

Authors :
Brodsky, Stanley J.
Menke, Sven
Merino, Carlos
Rathsman, Johan
Publication Year :
2002
Publisher :
arXiv, 2002.

Abstract

The 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.<br />15 pages, 4 figures, submitted to Physical Review D, added references, some text added, no results nor figures changed

Details

Database :
OpenAIRE
Accession number :
edsair.doi.dedup.....b48883905f5d1bb68965ee532fb2d8e8
Full Text :
https://doi.org/10.48550/arxiv.hep-ph/0212078