Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
1999-10-20
Phys.Lett.B472:175-188,2000
Physics
High Energy Physics
High Energy Physics - Experiment
21 pages including 4 figures and 2 tables
Scientific paper
10.1016/S0370-2693(99)01450-1
First inclusive measurements of isolated prompt photons in photoproduction at the HERA ep collider have been made with the ZEUS detector, using an integrated luminosity of 38.4 pb$^{-1}$. Cross sections are given as a function of the pseudorapidity and the transverse energy ($\eta^\gamma$, \eTg) of the photon, for $\eTg > $ 5 GeV in the $\gamma p$ centre-of-mass energy range 134-285 GeV. Comparisons are made with predictions from Monte Carlo models having leading-logarithm parton showers, and with next-to-leading-order QCD calculations, using currently available parameterisations of the photon structure. For forward $\eta^\gamma$ (proton direction) good agreement is found, but in the rear direction all predictions fall below the data.
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