Prompt Photon Production at HERA and LEP
Thomas Kluge (on behalf of the H1, OPAL, ZEUS Collaborations)
TL;DR
This paper reports measurements of isolated prompt photon production at HERA and LEP, comparing experimental data with perturbative QCD predictions and event generator models to test theoretical accuracy.
Contribution
It provides new experimental data on prompt photon production in ep and photon-photon collisions, and evaluates the performance of QCD calculations and simulation tools.
Findings
Measured differential cross sections for prompt photons and photon+jet events.
Data generally agree with next-to-leading order perturbative QCD predictions.
Event generators PYTHIA and HERWIG show varying degrees of agreement with the measurements.
Abstract
Results on isolated prompt photon production are presented. The measurements were performed at HERA in deep inelastic ep scattering and photoproduction, as well as at LEP in photon photon collisions. Differential cross sections are shown for inclusive prompt photons and those accompanied by a jet. The results are compared to predictions of perturbative QCD calculations in next to leading order and to predictions of the event generators PYTHIA and HERWIG.
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