Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-07-19
Phys.Rev.D81:094027,2010
Physics
High Energy Physics
High Energy Physics - Phenomenology
22 pages, 13 figures, 2 table
Scientific paper
10.1103/PhysRevD.81.094027
We investigate the prompt photon photoproduction at HERA within the framework of kt-factorization QCD approach. Our consideration is based on the off-shell matrix elements for the underlying partonic subprocesses. The unintegrated parton densities in a proton and in a photon are determined using the Kimber-Martin-Ryskin (KMR) prescription. Additionally, we use the CCFM-evolved unintegrated gluon as well as valence and sea quark distributions in a proton. A conservative error analisys is performed. Both inclusive and associated with the hadronic jet production rates are investigated. The theoretical results are compared with the recent experimental data taken by the H1 and ZEUS collaborations. We study also the specific kinematical properties of the photon-jet system which are strongly sensitive to the transverse momentum of incoming partons. Using the KMR scheme, the contribution from the quarks emerging from the earlier steps of the parton evolution is estimated and found to be of 15 - 20 approximately.
Lipatov A. V.
Zotov Nikolay P.
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