Distribution amplitude for the photon-pion transition
Abstract
The exclusive production of ππ and π in hard γγ scattering in the forward kinematical region where the virtual photon is highly off-shell are studied through the γπ- Transition Distribution Amplitudes. The calculation is based on a covariant Bethe-Salpeter approach, applied to the Nambu - Jona-Lasinio model, for the determination of the pion bound state. In particular it is shown that the pion pole contribution produces a large enhancement of the differential cross section for the pion pair production with respect to previous estimates.
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