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Higher order QCD corrections to the photoproduction of a direct photon at HERA |
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| Authors: | P. Aurenche P. Chiappetta M. Fontannaz J. P. Guillet E. Pilon |
| Affiliation: | 1. Laboratoire de Physique Théorique, ENSLAPP, BP 110, F-74941, Annecy le Vieux Cédex, France 2. Faculté des Sciences de Luminy, Centre de Physique Théorique, F-13288, Marseille, France 3. Laboratoire de Physique Théorique et Hautes Energies, Université Paris XI, Bat, 211, F-91405, Orsay, France |
| 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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