A model of a transition neutral pion formfactor measured in annihilation and scattering channels

Abstract

We consider an alternative explanation of newly found growth of neutral pion transition form factor with virtuality of one of photon. It is based on Sudakov suppression of quark-photon vertex. Some applications to scattering and annihilation channels are considered including the relevant experiments with lepton-proton scattering.

arXiv comment5 pages, 4 figure

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• Axial anomaly and mixing: from real to highly virtual photons
• Pion transition form factor in the constituent quark model
• Pion-Photon Transition Form Factor and Pion Distribution Amplitude in QCD: Facing the Enigmatic Behavior of the BaBar Data
• EKHARA - new gamma gamma generator