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.

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

COSTA, Marco;MONACO, Vincenzo;SACCHI, Roberto;V. Sola;SOLANO, Ada Maria;
2012-01-01

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.
2012
715
88
97
http://dx.doi.org/10.1016/j.physletb.2012.07.031
ZEUS; CENTRAL TRACKING DETECTOR; ZEUS BARREL CALORIMETER; E-T PHOTONS; CROSS-SECTION; P(P)OVER-BAR COLLISIONS; PROMPT PHOTONS; TRANSVERSE-MOMENTUM; HADRON-COLLISIONS; ROOT-S=1.8 TEV; MONTE-CARLO
H. Abramowicz;I. Abt;L. Adamczyk;M. Adamus;R. Aggarwal;S. Antonelli;P. Antonioli;A. Antonov;M. Arneodo;O. Arslan;V. Aushev;Y. Aushev;O. B...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/125030
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