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[en] The SU(3) beta function is derived from Wilson loops computed to 20th order in numerical stochastic perturbation theory. An attempt is made to include massless fermions, whose contribution is known analytically to 4th order. The question whether the theory admits an infrared stable fixed point is addressed.
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Sep 2013; 10 p; EDINBURGH--2013-18; LIVERPOOL-LTH--983; ISSN 0418-9833; 