QCD Perturbation Theory at Low Energies
classification
✦ hep-ph
keywords
energiestheoryagreementalphaapplycalculationcouplantdown
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We apply the optimization procedure based on the Principle of Minimal Sensitivity to the third-order calculation of $\R$. The effective couplant remains finite, freezing to a value $\alpha_s/\pi = 0.26$ at low energies. Using Poggio-Quinn-Weinberg smearing we find good agreement between theory and experiment right down to zero energy.
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