The special features of forward pion photoproduction at high energies are discussed. It is established that the cross section for single pion production can generally be expected to have a forward dip barring a conspiracy between Regge trajectories. Photo-production of the A₁ (1⁺) meson followed by its decay is suggested as an important source of high-energy forward pions.
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Drell et al. (1967) studied this question.
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