PHOTOPRODUCTION OF LARGE-PT HADRONS BY POLARIZED BEAM AND TARGET

The production at large transverse momentum (p(T)) Of hadrons by a pol arized photon beam on a longitudinally polarized proton target is stud ied. The contributions due to the structure of the photon are taken in to account and discussed. In certain kinematic domains cross sections and event rates sizable enough for successful experiments are predicte d and single hadron production is shown to be a good probe of the size of the polarized gluon distribution. A particularly clean probe is fo und to be a special combination of cross sections for the production o f two large-p(T) hadrons. The feasibility of high-energy polarized pho ton beams is also discussed.