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Measurement of isolated photons accompanied by jets in deep inelastic ep scattering
Journal article   Peer reviewed

Measurement of isolated photons accompanied by jets in deep inelastic ep scattering

H. Abramowicz, I. Abt, L. Adamczyk, M. Adamus, R. Aggarwal, S. Antonelli, P. Antonioli, A. Antonov, M. Arneodo, O. Arslan, …
Physics letters. B, Vol.715(1-3), pp.88-97
08/29/2012
DOI: 10.1016/j.physletb.2012.07.031

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Abstract

The production of isolated high-energy photons accompanied by jets has been measured in deep inelastic ep scattering with the ZEUS detector at HERA, using an integrated luminosity of 326 pb(-1). Measurements were made for exchanged photon virtualities Q(2), in the range 10 to 350 GeV2. The photons were measured in the transverse-energy and pseudorapidity ranges 4 < E-T(gamma) < 15 GeV and -0.7 < eta(gamma) < 0.9, and the jets were measured in the transverse-energy and pseudorapidity ranges 2.5 < E-T(jet) < 35 GeV and -15< eta(jet) < 1.8. Differential cross sections are presented as functions of these quantities. Perturbative QCD predictions give a reasonable description of the shape of the measured cross sections over most of the kinematic range but the absolute normalisation is typically in disagreement by 20-30%. (c) 2012 Elsevier B.V. All rights reserved.
Physical Sciences Physics Astronomy & Astrophysics Physics, Nuclear Physics, Particles & Fields Science & Technology

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