5-12 July 2017
Venice, Italy
Europe/Zurich timezone
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Studies of the diffractive photoproduction of isolated photons at HERA

6 Jul 2017, 10:15
Room Welles (Palazzo del Casinò)

Room Welles

Palazzo del Casinò

Parallel Talk QCD and Hadronic Physics QCD and hadronic physics


Aharon Levy (Tel Aviv University (IL))


The photoproduction of isolated photons has been measured using diffractive events recorded by the ZEUS detector at HERA. Cross sections are evaluated in the photon transverse-energy and pseudorapidity ranges 5 < $E_T^\gamma$ < 15 GeV and
−0.7 < $\eta^\gamma$ < 0.9, inclusively and also with a jet with transverse-energy and pseudorapidity in the ranges 4 < $E_T^{jet}$ < 35 GeV and −1.5 < $\eta^{jet}$ < 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 $z_{pom}^{meas}$ > 0.9 where $z_{pom}^{meas}$ 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.

Experimental Collaboration ZEUS

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