Pion form factor and QCD sum rules: case of axial current

Abstract

We present an analysis of QCD sum rules for pion form factor in next-to-leading order of perturbation theory for the case of axial-vector pion currents. The theoretical predictions for Q^2-dependence of pion form factor are in good agreement with available experimental data. It is shown, that NLO corrections are large in this case and should be taken into account in rigorous theoretical analysis.

LaTeX file, 10 pages, 5 figures, v2: added check of Ward identity constrains at Q^2=0, the continuum thresholds are determined to satisfy F_π(0)=1 condition with NLO accuracy, what led to \approx 10% reduction of our numerical estimates, references added

References in corpus (1)

• Pion form factor and QCD sum rules: case of pseudoscalar current

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