Measurement of prompt photons with associated jets in photoproduction at HERA
(2007) European Physical Journal C. Particles and Fields — Vol. 49, p. 511-522 (2007)
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- et. al.
- Abstract
- (en) The photoproduction of prompt photons, together with an accompanying jet, has been studied in ep collisions at a centre-of-mass energy of 318 GeV with the ZEUS detector at HERA using an integrated luminosity of 77 pb-1. Cross sections were measured for the transverse energy of the photon and the jet larger than 5 and 6 GeV, respectively. The differential gamma+jet cross sections were reconstructed as functions of the transverse energy, pseudorapidity and x_gamma^obs, the fraction of the incoming photon momentum taken by the photon-jet system. Predictions based on leading-logarithm parton-shower Monte Carlo models and next-to-leading-order (NLO) QCD generally underestimate the cross sections for the transverse energies of prompt photons below 7 GeV, while the kT-factorisation QCD calculation agrees with the data better. When the minimum transverse energy of prompt photons is increased to 7 GeV, both NLO QCD and the kT-factorisation calculations are in good agreement with the data. Comment: 22 pages, 7 eps figues, 2 tables
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Citations
Piotrzkowski, K., Chekanov, S., de Favereau, J., & et al. (2007). Measurement of prompt photons with associated jets in photoproduction at HERA. European Physical Journal C. Particles and Fields, 49, 511-522. https://doi.org/10.1140/epjc/s10052-006-0134-1 (Original work published 2007)