PoS - Proceedings of Science
Volume 340 - The 39th International Conference on High Energy Physics (ICHEP2018) - Parallel: Strong Interactions and Hadron Physics
Further studies of the production of isolated photons at HERA
P.J. Bussey*  on behalf of the ZEUS Collaboration
Full text: pdf
Published on: August 02, 2019
The ZEUS detector at HERA has been used to measure the production of isolated photons in two types of process: deep inelastic scattering (DIS) and diffractive photoproduction. The DIS results are presented as functions of two- and multi-particle final-state quantities, extending an earlier publication. Comparison is made with two NLO-based theoretical calculations. In diffraction, cross
sections are evaluated in terms of a number of variables,
differentiating between direct and resolved photon and pomeron processes. Evidence is found for the existence of a direct pomeron process in this reaction. The shapes of all the distributions are consistent with predictions from the RAPGAP Monte Carlo simulation.
DOI: https://doi.org/10.22323/1.340.0372
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