Prompt Photons in Photoproduction at HERA
Abstract
Description
First inclusive measurements of isolated prompt photons in photoproduction at HERA have been made with the ZEUS detector. Cross sections are given as a function of the pseudorapidity and the transverse energy of the photon, for E_T^gamma > 5 GeV in the gamma-p centre-of-mass energy range 134-285 GeV. Comparisons are made with predictions from LO Monte Carlo models and NLO QCD calculations. For forward eta^gamma (proton direction) good agreement is found, but in the rear direction all predictions fall below the data.
for the ZEUS Collaboration; Talk given at the 8th International Workshop on Deep Inelastic Scattering and QCD (DIS'2000), Liverpool, UK, April 25-30, 2000
for the ZEUS Collaboration; Talk given at the 8th International Workshop on Deep Inelastic Scattering and QCD (DIS'2000), Liverpool, UK, April 25-30, 2000