The paper reviews the 1/L-expansion of analytic QCD coupling from the authors' earlier work and demonstrates that it can describe pion-photon transition form factor data without reporting fit statistics.
Pion-photon transition form factor with analytic coupling
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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.
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QCD analytic coupling
The paper reviews the 1/L-expansion of analytic QCD coupling from the authors' earlier work and demonstrates that it can describe pion-photon transition form factor data without reporting fit statistics.