An extended study of the prompt photon photoproduction at HERA with $k_T$-factorization

Abstract

We reconsider the prompt photon photoproduction at HERA in the framework of the $k_T$-factorization QCD approach. The proposed method is based on the $\mathcal{O}({\alpha }^2{\alpha }_s)$ amplitudes for $\gamma q\to \gamma gq$ and $\gamma g^{\ast }\to \gamma q\bar{q}$ partonic subprocesses. Additionally, we take into account the $\mathcal{O}({\alpha }^2{\alpha }_s^2)$ box contributions $\gamma g\to \gamma g$ to the production cross sections. The unintegrated (or transverse momentum dependent) parton densities in the proton are determined using Kimber-Martin-Ryskin (KMR) prescription. Our consideration covers both inclusive and jet associated prompt photon photoproduction rates. We find that our numerical predictions agree well with the recent data taken by H1 and ZEUS collaborations at HERA. We demonstrate that the box contributions are sizeable and amount up to $\sim 15$ of the calculated total cross section.

18 pages, 10 figures

References in corpus (7)

• Parton distributions for the LHC
• Direct Photon Production in Association With A Heavy Quark At Hadron Colliders
• Measurement of the differential photon+ c-jet cross section and the ratio of differential photon+ c and photon+ b cross sections in proton-antiproton collisions at sqrt(s) = 1.96 TeV
• Measurement of the photon$+b$-jet production differential cross section in $p\bar{p}$ collisions at $\sqrt{s}=1.96~\TeV$
• Measurement of the cross section for direct-photon production in association with a heavy quark in $p\bar{p}$ collisions at $\sqrt{s}$ = 1.96 TeV
• Prompt photon and associated heavy quark production at hadron colliders with kt-factorization
• Isolated prompt photon pair production at hadron colliders with kt-factorization

Cited by in corpus (4)

• Prompt-photon plus jet associated photoproduction at HERA in the parton Reggeization approach
• TMD parton showers for associated $\gamma$+jet production in electron-proton collisions at high energies
• TMD parton shower effects in associated $\gamma$ + jet production at LHC
• Prompt-photon plus jet photoproduction with ZEUS at DESY HERA in the parton Reggeization approach