Strong coupling constant from $\tau$ decay within renormalization scheme invariant treatment

Abstract

We extract a numerical value for the strong coupling constant α_s from the τ-lepton decay rate into nonstrange particles. A new feature of our procedure is the explicit use of renormalization scheme invariance in analytical form in order to perform the actual analysis in a particular renormalization scheme. For the reference coupling constant in the \MSsch-scheme we obtain α_s(M_τ)= 0.3184 \pm 0.0060_{exp} which corresponds to \al_s(M_Z)= 0.1184 \pm 0.0007_{exp} \pm 0.0006_{hq mass}. This new numerical value is smaller than the standard value from $\tau$-data quoted in the literature and is closer to \al_s(M_Z)-values obtained from high energy experiments.

8 pages

References in corpus (4)

• Renormalization group analysis of the tau-lepton decay within QCD
• Vacuum Saturation Hypothesis and QCD Sum Rules
• Two-loop corrections to the correlator of tensor currents in gluodynamics
• What QCD Tells Us About Nature -- and Why We Should Listen

Cited by in corpus (22)

• The Physics of Hadronic Tau Decays
• The Determination of alpha_s from Tau Decays Revisited
• A study of the energy evolution of event shape distributions and their means with the DELPHI detector at LEP
• Semileptonic decays of Bc mesons into charmonium states in a relativistic quark model
• On the Behavior of the Effective QCD Coupling alpha_tau(s) at Low Scales
• Tests of Quantum Chromo Dynamics at e^+e^- Colliders
• Bilocal expansion of the Borel amplitude and the hadronic tau decay width
• Towards Order alpha_s^4 Accuracy in tau-decays
• Inclusive weak decays of heavy hadrons with power suppressed terms at NLO
• $B^0-{\bar{B}}^0$ Mixing at Next-to-Leading Order
• Testing the Concept of Quark-Hadron Duality with the ALEPH $\tau$ Decay Data
• Resummation of the hadronic tau decay width with the modified Borel transform method
• Precision Determination of Heavy Quark Masses and the Strong Coupling Constant
• Scale- and scheme-independent extension of Pade approximants; Bjorken polarized sum rule as an example
• Spectral moments of two-point correlators in perturbation theory and beyond
• Remark on the perturbative component of inclusive $\tau$-decay
• Understanding perturbative results for decays of τleptons into hadrons
• Next-to-Leading Order perturbative QCD corrections to baryon correlators in matter
• Running electromagnetic coupling constant: low energy normalization and the value at M_Z
• Spectrality, coupling constant analyticity and the renormalization group
• Disentangling perturbative and power corrections in precision tau decay analysis
• Calculating loops without loop calculations: NLO computation of pentaquark correlators