DIRECT PHOTON PRODUCTION IN POLARIZED HADRON-COLLISIONS AT COLLIDER AND FIXED TARGET ENERGIES

Recently determined next-to-leading order sets of polarized parton dis tributions are used to study large-P-T (P) over right arrow (P) over r ight arrow-->gamma + X at root s = 38, 100, and 500 GeV. Certain conve rsion terms, necessary to use the above sets, are determined. It is co ncluded that, to distinguish between the above sets, planned experimen ts at BNL RHIC should be successful, in particular, at a c.m. photon p seudorapidity similar or equal to 1, and that a proposed HERA-(N) over right arrow fixed target experiment should have a rather large accura cy at relatively large x(T) (=2p(T)/root s).