Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2001-05-16
Phys.Rev.D64:114017,2001
Physics
High Energy Physics
High Energy Physics - Phenomenology
latex file, 16 pages, 14 ps figures, formulae corrected, small improvements in the text
Scientific paper
10.1103/PhysRevD.64.114017
The NLO QCD calculation for the photoproduction of the isolated photon with a large pT at the HERA ep collider is presented. The single resolved photon contribution and the QCD corrections of order alpha_s to the Born term are consistently included. The NNLO contributions, the box and the double resolved photon subprocesses, are sizeable and are taken into account in addition. The importance of the isolation cut, as well as the influence of other experimental cuts on pT and final photon rapidity distributions are discussed in detail. The investigation of the renormalization scale dependence is performed in order to estimate the size of missing higher order QCD corrections. Results are compared with experimental data and with the prediction of a different NLO calculation.
Krawczyk Maria
Zembrzuski Andrzej
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