Further studies of the production of isolated photons at HERA
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.
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