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

H. Abramowicz, Iris Abt, L. Adamczyk, M. Adamus, Ritu Aggarwal, S. Antonelli, P. Antonioli, А. Антонов, M. Arneodo, O. Arslan

90 more authors

V. Aushev, Y. Aushev, O. Bachynska, A. Bamberger, A.N. Barakbaev, G. Barbagli, Giacomo Bari, Fernando Barreiro, N. Bartosik, D. Bartsch, M. Basile, O. Behnke, J. K. Behr, U. Behrens, L. Bellagamba, A. Bertolin, S. Bhadra, M. Bindi, C. Blohm, V. Bokhonov, T. Bołd, Kyrylo Bondarenko, E. Boos, K. Borras, D. Boscherini, D. Bot, Ian C. Brock, E. Brownson, R. Brugnera, N.C. Brümmer, A. Bruni, G. Bruni, B. Brzozowska, Peter John Bussey, Ben Bylsma, Allen Christopher Caldwell, M. Capua, R. Carlin, C. D. Catterall, Sergei V. Chekanov, J. J. Chwastowski, J. Ciborowski, R. Ciesielski, L. Cifarelli, F. Cindolo, A. Contin, A. M. Cooper-Sarkar, N. Coppola, M. Corradi, F. Corriveau, M. Costa, G. D’Agostini, F. Dal Corso, J. Del Peso, R. K. Dementiev, S. De Pasquale, Malcolm Derrick, R.C.E. Devenish, D. Dobur, B. A. Dolgoshein, Ganna Dolinska, A. T. Doyle, V. Drugakov, L. S. Durkin, S. Dusini, Yael Eisenberg, P. Ermolov, A. Eskreys, S. Fang, Salvatore Fazio, J. Ferrando, M.I. Ferrero, J. Figiel, M. Forrest, Brian Foster, G. P. Gach, A. Galas, E. Gallo, A. Garfagnini, A. Geiser, Ioannis Gialas, A. Gizhko, L. K. Gladilin, D. Gladkov, Claudia Glasman, O. Gogota, Yu. A. Golubkov, P. Göttlicher, I. Grabowska-Bołd, J. Grebenyuk

2012

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DOI 10.1016/j.physletb.2012.07.031
Data confidence 70 medium
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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 GeV 2 . The photons were measured in the transverse-energy and pseudorapidity ranges 4 < E T γ < 15 GeV and − 0.7 < η γ < 0.9 , and the jets were measured in the transverse-energy and pseudorapidity ranges 2.5 < E T jet < 35 GeV and − 1.5 < η 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%.