Study of non-collinear parton dynamics in the prompt photon photoproduction at HERA - High Energy Physics - PhenomenologyReport as inadecuate




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Abstract: We investigate the prompt photon photoproduction at HERA within the frameworkof kt-factorization QCD approach. Our consideration is based on the off-shellmatrix elements for the underlying partonic subprocesses. The unintegratedparton densities in a proton and in a photon are determined using theKimber-Martin-Ryskin KMR prescription. Additionally, we use the CCFM-evolvedunintegrated gluon as well as valence and sea quark distributions in a proton.A conservative error analisys is performed. Both inclusive and associated withthe hadronic jet production rates are investigated. The theoretical results arecompared with the recent experimental data taken by the H1 and ZEUScollaborations. We study also the specific kinematical properties of thephoton-jet system which are strongly sensitive to the transverse momentum ofincoming partons. Using the KMR scheme, the contribution from the quarksemerging from the earlier steps of the parton evolution is estimated and foundto be of 15 - 20 approximately.



Author: A.V. Lipatov, N.P. Zotov

Source: https://arxiv.org/







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