Abstract
Power-suppressed corrections ~(1/Q2)p, p = 1,2… to the electromagnetic transition form factor Q2Fπγ(Q2) are estimated using the running coupling constant method. Within this method the renormalization scale in the QCD expression for Fπγ(Q2) is taken to be equal to [Formula: see text] (or to [Formula: see text]) and computation of the form factor with running coupling [Formula: see text] is carried out. In calculations the pion asymptotic and model distribution amplitudes (DAs), as well as DAs found in the context of the "naive non-Abelianization" approximation are employed. Comparisons are made with frozen coupling constant approximation results and with the experimental data.
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