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VOLUME 124 (2026) | ISSUE 7 | PAGE 513
Pion-photon transition form factor with analytic coupling
DOI: 10.7868/S3034576626100013
Abstract
We investigate the pion-photon transition form factor within the framework of analytic QCD. A comparison is performed between experimental data and perturbative QCD based on conventional and analytic versions of perturbation theory with the "massive" form of the twist-four contribution. We show that conventional perturbation theory fails to reproduce the data, while the analytic version demonstrates good agreement with experiment.