The 16-Nf Expansion and the Infrared Fixed Point in Perturbative QCD
Abstract
In QCD with 16-epsilon massless quark flavours there is an infrared fixed point with alphas/pi = (8/321)epsilon in the limit epsilon -> 0+. I develop the idea of Banks and Zaks to expand about Nf=16. This expansion is certainly useful for Nf=16, 15, 14, ..., and arguably it can reach the phenomenologically interesting case Nf=2, where it suggests that alphas/pi "freezes" to a value of order of magnitude 0.4 in the infrared.
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