Measurements of the production of high transverse momentum direct photons by a 515 GeV/c π^- beam and 530 and 800 GeV/c proton beams in interactions with beryllium and hydrogen targets are presented. The data span the kinematic ranges of 3.5<pT<12 GeV/c in transverse momentum and 1.5 units in rapidity. The inclusive direct-photon cross sections are compared with next-to-leading-order perturbative QCD calculations and expectations based on a phenomenological parton-kT model.
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Apanasevich et al. (2004) studied this question.