Nonperturbative Power Corrections in ${\bar{\alpha }}_s(q^2)$ of Two-Loop Analytization Procedure

Abstract

The analytization procedure which allows one to remove nonphysical singularities of the QCD running coupling constant ${\bar{\alpha }}_s(q^2)$ in the infrared region is applied to standard as well as to iterative solutions of the two-loop renormalization group equation. Non-leading at large momentum nonperturbative contributions in ${\bar{\alpha }}_s(q^2)$ are obtained in an explicit form. The coefficients of nonperturbative contributions expansions in inverse powers of the squared Euclidean momentum are calculated. For both cases considered there appear convergent at $q^2>{\Lambda }^2$ power series of negative terms with different dependence on term numbers.

Comments: 12 pages, LATEX