QCD Perturbation Theory at Low Energies
A. C. Mattingly, P. M. Stevenson
Abstract
We apply the optimization procedure based on the Principle of Minimal Sensitivity to the third-order calculation of . The effective couplant remains finite, freezing to a value αs/π= 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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