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 < η(γ) < 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 zP(meas) > 0.9, where zP(meas) 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.
Volume 314 -
The European Physical Society Conference on High Energy Physics (EPS-HEP2017) -
QCD and Hadronic Physics (Parallel Session). Conveners: Ulla Blumenschein; Kostas Kousouris; Maria Ubiali. Scientific Secretary: Pierpaolo Mastrolia
Diffractive production of isolated photons with the ZEUS detector at HERA
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Pre-published on:
January 14, 2018
Published on:
March 20, 2018
Abstract
DOI: https://doi.org/10.22323/1.314.0387
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Copyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.