Prompt photon photoproduction at HERA within the framework of the quark Reggeization hypothesis

Abstract

We study the inclusive production of isolated prompt photons within the framework of the quasi-multi-Regge-kinematic approach, applying the quark Reggeization hypothesis. We describe accurately and without free parameters the transverse momentum and pseudorapidity spectra of prompt photons in the inclusive photoproduction at the HERA Collider. It is shown that the main mechanism of the inclusive prompt photon production in the gamma p collisions is the fusion of a Reggeized quark (antiquark) from the proton and a collinear antiquark (quark) from the photon into a photon, via the effective Reggeon-quark-gamma vertex. The fragmentation of the quark, which is produced via the gamma-Reggeon-quark and quark-Reggeon-quark vertices, into a photon is strongly suppressed by the isolation cone condition and it gives a significant contribution in the region of a large negative pseudorapidity only. At the stage of numerical calculations we use the Kimber-Martin-Ryskin prescription for unintegrated quark and gluon distribution functions, with the following collinear parton densities as input: MRST for a proton and GRV for a photon.

12 pages, 4 figures

References in corpus (3)

• Charmonium Production at High Energy in the k_T-Factorization Approach
• Bottomonium Production in the Regge Limit of QCD
• Deep inelastic scattering and prompt photon production within the framework of quark Reggeization hypothesis

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• Open charm production in the parton Reggeization approach: from Tevatron to LHC
• A kT-dependent sea-quark density for the CASCADE Monte Carlo event generator
• Associated production of $J/\psi$ and direct photon in the NRQCD and the ICEM using the high-energy factorization
• Single isolated photon production in the NLO${}^{\star }$ approximation of the Parton Reggeization Approach