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| Report/Journal Article | PUBDB-2018-00922 |
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2018
Springer
Berlin
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Please use a persistent id in citations: doi:10.1007/JHEP01(2018)032 doi:10.3204/PUBDB-2018-00922
Report No.: DESY-17-212; arXiv:1712.04273
Abstract: Isolated photons with high transverse energy have been studied in deep inelastic ep scattering with the ZEUS detector at HERA, using an integrated luminosity of 326 pb$^{−1}$ in the range of exchanged-photon virtuality 10-350 GeV$^{2}$. Outgoing isolated photons with transverse energy 4 < E$_{T}^{γ}$ < 15 GeV and pseudorapidity − 0.7 < η$^{γ}$ < 0.9 were measured with accompanying jets having transverse energy and pseudorapidity 2.5 < E$_{T}^{jet}$ < 35 GeV and −1.5 < η$^{jet}$ < 1.8, respectively. Differential cross sections are presented for the following variables: the fraction of the incoming photon energy and momentum that is transferred to the outgoing photon and the leading jet, the fraction of the incoming proton energy transferred to the photon and leading jet, the differences in azimuthal angle and pseudorapidity between the outgoing photon and the leading jet and between the outgoing photon and the scattered electron. Comparisons are made with theoretical predictions: a leading-logarithm Monte Carlo simulation, a next-to-leading-order QCD prediction, and a prediction using the k$_{T}$ -factorisation approach.
Keyword(s): electron p: colliding beams ; photon: energy ; photon: production ; photon: transverse energy ; transverse energy: high ; numerical calculations: Monte Carlo ; transverse momentum: factorization ; higher-order: 1 ; electron p: deep inelastic scattering ; DESY HERA Stor ; differential cross section: measured ; energy dependence ; rapidity dependence ; quantum chromodynamics: perturbation theory ; perturbation theory: higher-order ; ZEUS ; experimental results
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Preprint/Report
Further studies of isolated photon production with a jet in deep inelastic scattering at HERA
[10.3204/PUBDB-2017-13434]
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