QCD and QED renormalization group functions - a large N_f approach

Abstract

The large N_f self-consistency programme is reviewed. As an application the QCD beta-function is computed at O(1/N_f) and the anomalous dimensions of polarized twist-2 singlet operators are determined at the same order.

Comments: Talk given at DESY workshop QCD and QED in higher order; 8 pages latex plus 1 figure