The Banks-Zaks Expansion and "Freezing" in Perturbative QCD

Details The Banks-Zaks Expansion and "Freezing" in Perturbative QCD The Banks-Zaks Expansion and "Freezing" in Perturbative QCD

1997-05-15

arxiv.org/abs/hep-ph/9705319v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

19 pages, LaTeX, including 3 figures using epsf

Scientific paper

The recent calculation of the four-loop beta function in QCD provides further
evidence that the Banks-Zaks expansion in 16half-n_f is sufficiently well
behaved to be useful even for n_f=2 light flavours. This expansion inherently
predicts "freezing" of the QCD couplant at low energies as a perturbative
effect. We consider the e+e- and Bjorken-sum-rule cases as examples.

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