Measurement of inclusive prompt photon photoproduction at HERA

Abstract

First inclusive measurements of isolated prompt photons in photoproduction at the HERA ep collider have been made with the ZEUS detector, using an integrated luminosity of 38.4 pb${}^{-1}$. Cross sections are given as a function of the pseudorapidity and the transverse energy (${\eta }^{\gamma }$, \eTg) of the photon, for $\eTg > $ 5 GeV in the $\gamma p$ centre-of-mass energy range 134-285 GeV. Comparisons are made with predictions from Monte Carlo models having leading-logarithm parton showers, and with next-to-leading-order QCD calculations, using currently available parameterisations of the photon structure. For forward ${\eta }^{\gamma }$ (proton direction) good agreement is found, but in the rear direction all predictions fall below the data.

21 pages including 4 figures and 2 tables

Cited by in corpus (30)

• Cross section of isolated prompt photons in hadron-hadron collisions
• Measurement of the inclusive isolated prompt photon cross section in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector
• Theory of hard photoproduction
• The Hadronic Final State at HERA
• Measurement of isolated photon production in deep inelastic ep scattering
• Prompt photon photoproduction at HERA in the k_T-factorization approach
• Survey of present data on photon structure functions and resolved photon processes
• Inclusive prompt photon production in electron-nucleus scattering at small x
• Production of pizero and eta mesons at large transverse momenta in pp and pBe interactions at 530 and 800 GeV/c
• Measurement of Prompt Photon Cross Sections in Photoproduction at HERA
• Study of the effective transverse momentum of partons in the proton using prompt photons in photoproduction at HERA
• Prompt photon photoproduction at HERA within the framework of the quark Reggeization hypothesis
• Observation of isolated high-E_T photons in deep inelastic scattering
• Measuring the Photon Fragmentation Function at HERA
• Measurement of prompt photons with associated jets in photoproduction at HERA
• Prompt Photons in Photoproduction at HERA
• Measurement of Isolated Photon Production in Deep-Inelastic Scattering at HERA
• Prompt-photon plus jet associated photoproduction at HERA in the parton Reggeization approach
• Study of non-collinear parton dynamics in the prompt photon photoproduction at HERA
• Isolated photon + jet photoproduction as a tool to constrain the gluon distribution in the proton and the photon
• Photoproduction of the isolated photon at HERA in NLO QCD
• Measurement of isolated photons accompanied by jets in deep inelastic ep scattering
• High Energy Photoproduction
• An extended study of the prompt photon photoproduction at HERA with $k_T$-factorization
• Production of pizero and eta mesons at large transverse momenta in pi-p and pi-Be interactions at 515 GeV/c
• Towards understanding $b\bar{b}$ production in $\gamma \gamma$ collisions
• Photoproduction of isolated photons at HERA in NLO QCD
• Real and Virtual Photoproduction of Large-pt Particles at NLO
• Prompt photon production in photoproduction, DIS and hadronic collisions
• Prompt-photon plus jet photoproduction with ZEUS at DESY HERA in the parton Reggeization approach