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VOLUME 77 (2003) | ISSUE 2 | PAGE 68
Pion distribution amplitudes within the instanton model of QCD vacuum
PACS: 13.40.Gp
Abstract
Pion transition form factor for the process \gamma ^{\star }\gamma ^{\star}\rightarrow \pi ^{0} at space-like values of photon momenta is calculated within the effective quark-meson model with the interaction induced by instanton exchange. The leading and next-to-leading order power asymptotics of the form factor and the relation between the light-cone pion distribution amplitudes of twists 2 and 4 and the dynamically generated quark mass are found.