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 (ηγ, View the MathML source) of the photon, for View the MathML source GeV in the γp 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 ηγ (proton direction) good agreement is found, but in the rear direction all predictions fall below the data.
Measurement of inclusive prompt photon photoproduction at HERA
GARFAGNINI, ALBERTO;BRUGNERA, RICCARDO;CARLIN, ROBERTO;STROILI, ROBERTO;
2000
Abstract
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 (ηγ, View the MathML source) of the photon, for View the MathML source GeV in the γp 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 ηγ (proton direction) good agreement is found, but in the rear direction all predictions fall below the data.Pubblicazioni consigliate
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