Regge poles and Drell's production of high-energy particles

About two years ago DRELL proposed a simple mechanism for the production of collimated beams of high-energy particles by photons. In the case of pion production, a photon of high-energy k incident, e. g., on a nucleon target, produces an energetic pion of momentum q essentially in the forward direction. In the present work Drell's production is re-examined under the assumption that the exchanged object is not an elementary particle (i.e. a particle of constant spin), but a number of Regge poles