The effective exponent gamma(Q) and the slope of the beta function

Abstract

The slope of the beta function at a fixed point is commonly thought to be RG invariant and to be the critical exponent gamma* that governs the approach of any physical quantity R to its fixed-point limit: R*-R proportional to Q^gamma*. Chyla has shown that this is not quite true. Here we define a proper RG invariant, the "effective exponent" gamma(Q), whose fixed-point limit is the true gamma*.

8 pages, no figures. Minor improvements

References in corpus (1)

• Exploring arbitrarily high orders of optimized perturbation theory in QCD with nf -> 16.5

Cited by in corpus (2)

• Renormalization Scheme Dependence and the Renormalization Group Beta Function
• The Banks-Zaks expansion in perturbative QCD: an update