Renormalization of quantum chromodynamics in the two-loop approximation in an arbitrary gauge

The Gell-Mann–Low function and the anomalous dimensions of the propagators of quantum ehromodynamics are calculated in the two-loop approximation for arbitrary value of the gauge parameter. A new derivation of the equations of the renormalization group by means of a functional integral is proposed. All the renormalization-group restrictions on the renormalization coefficients are described.