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 GeV2. Outgoing isolated photons with transverse energy 4 < ET γ < 15 GeV and pseudorapidity − 0.7 < ηγ < 0.9 were measured with accompanying jets having transverse energy and pseudorapidity 2.5 < ET jet < 35 GeV and −1.5 < ηjet< 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 kT -factorisation approach.

Original languageEnglish
Article number32
JournalJournal of High Energy Physics
Issue number1
StatePublished - 1 Jan 2018


FundersFunder number
Agensi Nuklear Malaysia
Alexander von Humboldt Foundation j Alexander von Humboldt Professor
Alexander von Humboldt Foundation s also atLódźUniversity, Poland
Italian National Institute for Nuclear Physics
Kobe University
Physikalisches Institut
Polish Air Force Academy in Deblin
Sant Longowal Institute of Engineering and Technology
Rockefeller University
Natural Sciences and Engineering Research Council of Canada
Science and Technology Facilities Council05h09GUF, SFB 676
Science and Technology Facilities Council
University of Liverpool
University of Bristol
Deutsches Elektronen-Synchrotron
Deutsche Forschungsgemeinschaft
Heidelberg University 
Ministry of Education, Culture, Sports, Science and Technology
Bundesministerium für Bildung und Forschung05 H09PDF C, RU006-2013, RP012B-13AFR, UM.C/625/1/HIR/149, RP012A-13AFR
Bundesministerium für Bildung und Forschung
Ministry of Higher Education, Malaysia
Israel Science Foundation
Instituto Nazionale di Fisica Nucleare
Universiti MalayaER004-2012A
Universiti Malaya


    • Lepton-Nucleon Scattering (experiments)
    • Photon production
    • QCD


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