Diffractive production of isolated photons with the zeus detector at hera

On behalf of the ZEUS Collaboration

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The photoproduction of isolated photons has been measured in diffractive events recorded by the ZEUS detector at HERA. Cross sections are evaluated in the photon transverse-energy and pseudorapidity ranges 5 < ET γ <15 GeV and −0.7 < ηγ < 0.9 inclusively and also with a jet with transverse energy and pseudorapidity in the ranges 4< ET jet < 35 GeV and -1.5< η jet < 1.8, using a total integrated electron–proton luminosity of 374 pb 1. A number of kinematic variables were studied and compared to predictions from the RAPGAP Monte Carlo model. An excess of data is observed above the RAPGAP predictions for zmeas IP > 0.9, where zmeas IP is the fraction of the longitudinal momentum of the colourless “Pomeron” exchange that is transferred to the photon–jet final state, giving evidence for direct Pomeron interactions.

Original languageEnglish
JournalProceedings of Science
StatePublished - 2017
Event2017 European Physical Society Conference on High Energy Physics, EPS-HEP 2017 - Venice, Italy
Duration: 5 Jul 201712 Jul 2017


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