Abstract
where R(t) is e i ther a cons tan t or a l inear funct ion, is appl ied to the charged-pion photoproduct ion processes ,/p -> u+n and yn -~ ~-p . We consider the z~, A s and p Regge exchanges and the appropr ia te absorpt ion cuts, s t rongly enhanced by coherent inelast ic factors ~'s. Our ampl i tudes are wr i t t en in the s-channel hel ic i ty formalism of COnENTANNOUDJI et al. (~). The A factors appear expl ic i t ly in the following formula for the full ampl i tude :
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