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1.	Aktas, A, et al. (author) Measurement of prompt photon cross sections in photoproduction at HERA 2005 In: European Physical Journal C. Particles and Fields. - : Springer Science and Business Media LLC. - 1434-6044. ; 38:4, s. 437-445 Journal article (peer-reviewed)abstract Results are presented on the photoproduction of isolated prompt photons, inclusively and associated with jets, in the gammap center of mass energy range 142 < W < 266 GeV. The cross sections are measured for the transverse momentum range of the photons 5 < E. T < 10 GeV and for associated jets with E-T(jet) > 4.5 GeV. They are measured differentially as a function of E-T(gamma), E-T(jet), the pseudorapidities eta(gamma) and eta(jet) and estimators of the momentum fractions x(gamma) and x(p) of the incident photon and proton carried by the constituents participating in the hard process. In order to further investigate the underlying dynamics, the angular correlation between the prompt photon and the jet in the transverse plane is studied. Predictions by perturbative QCD calculations in next to leading order are about 30% below the inclusive prompt photon data after corrections for hadronisation and multiple interactions, but are in reasonable agreement with the results for prompt photons associated with jets. Comparisons with the predictions of the event generators PYTHIA and HERWIG are also presented.

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Type of publication: journal article (1)

Type of content: peer-reviewed (1)

Author/Editor: Beckingham, M. (1); Berger, N. (1); Bracinik, J. (1); Bruncko, D. (1); Caron, S. (1); Cerny, K. (1); show more...; Desch, K. (1); Dingfelder, J. (1); Fleischmann, P. (1); Hoffmann, D. (1); Katzy, J. (1); Klein, M. (1); Kroseberg, J. (1); Laycock, P. (1); Lobodzinska, E. (1); Mehta, A. (1); Meier, K. (1); Meyer, J. (1); Naumann, T. (1); Nikiforov, A. (1); Rizvi, E. (1); Rurikova, Z. (1); Sauvan, E. (1); Schmitt, S. (1); Schoeffel, L. (1); Schwanenberger, C. (1); South, D. (1); Stamen, R. (1); Tsipolitis, G. (1); Valkar, S. (1); Vest, A. (1); Wessels, M. (1); Xella, S. (1); Zhang, Z. (1); Diaconu, C. (1); Ferencei, J. (1); Greenshaw, T. (1); Ibbotson, M. (1); Kluge, T. (1); Lendermann, V. (1); Garvey, J. (1); Haller, J. (1); Zhokin, A. (1); Aktas, A. (1); Collard, C. (1); Koblitz, B. (1); Kostka, P. (1); Lebedev, A. (1); Nozicka, M. (1); Placakyte, R. (1); show less...

University: Lund University (1)

Language: English (1)

Research subject (UKÄ/SCB): Natural sciences (1)

Year: 2005 (1)

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