Abstract
Using non-local chiral quark model and currents satisfying Ward-Takahashi identities we analyze Distribution Amplitudes (DA) of photon and pion-to-photon Transition Distribution Amplitudes (TDA) in the low energy regime. Photon DA’s are calculated an alytically up to twist-4 and reveal several interesting features of photon structure. TDA’s ca lculated in the present model satisfy polynomiality condition. Normalization of vector TDA is fix ed by the axial anomaly. We also compute relevant form factors and compare them with existing data. Axial form factor turns out to be much lower then the vector one, what indeed is seen in the experimental data.
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