Abstract
The contribution of resolved photons to the photoproduction cross section of direct photons is reexamined. Higher order,O(α 2 α s), QCD corrections to this contribution are calculated and turn out to be important at HERA energies. The observation of direct photons in the medium-p ⊥ range (p ⊥∼5 GeV/c) should provide the opportunity to measure the gluon content of the photon.
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Aurenche, P., Chiappetta, P., Fontannaz, M. et al. Higher order QCD corrections to the photoproduction of a direct photon at HERA. Z. Phys. C - Particles and Fields 56, 589–599 (1992). https://doi.org/10.1007/BF01474732
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DOI: https://doi.org/10.1007/BF01474732