ИСТИНА

The behavior of the pion transition form factor for the processes γ*γ* to pi0 at space-like values of photon momenta is estimated within the nonlocal covariant quark meson model. The nonlocal contributions are important to install the axial anomaly at zero virualitites and give the contributions to the twist-4 power correction to the form factor at large virtualities. The leading and next-to-leading order power asymptotics of the form factor and the relation between the light-cone pion distribution amplitudes and the dynamically generated quark mass function are found.