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Beta-Function in QCD and Gluon Condensate
A. I. Alekseev, B. A. Arbuzov
Under assumption of singular behavior of alpha_s(q^2) at q^2 sim 0 and of large q^2 behavior, corresponding to the perturbation theory up to four loops, a procedure is considered o…
On dependence of nonperturbative contributions in on an initial approximation of perturbation theory in an analytic approach to QCD
Aleksey I. Alekseev
In the framework of analytic approach to QCD, which has been recently intensively developed, the dependence of nonperturbative contributions in a running coupling of strong interac…
Nonperturbative Power Corrections in of Two-Loop Analytization Procedure
Aleksey I. Alekseev
The analytization procedure which allows one to remove nonphysical singularities of the QCD running coupling constant in the infrared region is applied to standard a…
The Model for QCD Running Coupling Constant with Dynamically Generated Mass and Enhancement in the Infrared Region
Aleksey I. Alekseev
Nonperturbative studies of the strong running coupling constant in the infrared region are discussed. Starting from the analyses of the Dyson -- Schwinger equations in the gauge se…
QCD Running Coupling: Freezing Versus Enhancement in the Infrared Region
Aleksey I. Alekseev
We discuss whether or not "freezing" of the QCD running coupling constant in the infrared region is consistent with the Schwinger -- Dyson (SD) equations. Since the consistency of…