Studies of the diffractive photoproduction of isolated photons at HERA

2017/05/29 by ZEUS Collaboration
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex)

paper · doi:10.48550/arxiv.1705.10251

Abstract

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 < E_T < 15 GeV and -0.7 < η< 0.9, inclusively and also with a jet with transverse energy and pseudorapidity in the ranges 4 < E_jet < 35 GeV and -1.5 < η_jet < 1.8, using a total integrated electron-proton luminosity of 456 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 z^meas_Pomeron > 0.9, where z^meas_Pomeron 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.

Related

• Diffractive production of isolated photons at HERA
• Diffractive production of isolated photons with the ZEUS detector at HERA
• Prompt Photons in Photoproduction at HERA
• Isolated Prompt Photon Plus Jet Photoproduction at HERA
• Jets and Prompt Photons in Photoproduction at ZEUS