Inclusive dijet production at low Bjorken-x in deep inelastic scattering

A. Aktas, V. Andreev, T. Anthonis, A. Asmone, A. Babaev, S. Backovic, J. Bähr, P. Baranov, E. Barrelet, W. Bartel, S. Baumgartner, J. Becker, M. Beckingham, O. Behnke, O. Behrendt, A. Belousov, Ch Berger, T. Berndt, J. C. Bizot, J. BöhmeM. O. Boenig, V. Boudry, J. Bracinik, W. Braunschweig, V. Brisson, H. B. Bröker, D. P. Brown, D. Bruncko, F. W. Büsser, A. Bunyatyan, G. Buschhorn, L. Bystritskaya, A. J. Campbell, S. Caron, F. Cassol-Brunner, V. Chekelian, D. Clarke, C. Collard, J. G. Contreras, Y. R. Coppens, J. A. Coughlan, M. C. Cousinou, B. E. Cox, G. Cozzika, J. Cvach, J. B. Dainton, W. D. Dau, K. Daum, B. Delcourt, N. Delerue, R. Demirchyan, A. de Roeck, E. A. de Wolf, C. Diaconu, J. Dingfelder, V. Dodonov, J. D. Dowell, A. Dubak, C. Duprel, G. Eckerlin, V. Efremenko, S. Egli, R. Eichler, F. Eisele, M. Ellerbrock, E. Elsen, M. Erdmann, W. Erdmann, P. J W Faulkner, L. Favart, A. Fedotov, R. Felst, J. Ferencei, M. Fleischer, P. Fleischmann, Y. H. Fleming, G. Flucke, G. Flügge, A. Fomenko, I. Foresti, J. Formánek, G. Franke, G. Frising, E. Gabathuler, K. Gabathuler, J. Garvey, J. Gassner, J. Gayler, R. Gerhards, C. Gerlich, S. Ghazaryan, L. Goerlich, N. Gogitidze, S. Gorbounov, C. Grab, V. Grabski, H. Grässler, T. Greenshaw, M. Gregori, G. Grindhammer, D. Haidt, L. Hajduk, J. Haller, G. Heinzelmann, R. C W Henderson, H. Henschel, O. Henshaw, R. Heremans, G. Herrera, I. Herynek, M. Hildebrandt, K. H. Hiller, J. Hladký, P. Höting, D. Hoffmann, R. Horisberger, A. Hovhannisyan, M. Ibbotson, M. Jacquet, L. Janauschek, X. Janssen, V. Jemanov, L. Jönsson, C. Johnson, D. P. Johnson, H. Jung, D. Kant, M. Kapichine, M. Karlsson, J. Katzy, F. Keil, N. Keller, J. Kennedy, I. R. Kenyon, C. Kiesling, M. Klein, C. Kleinwort, T. Kluge, G. Knies, B. Koblitz, S. D. Kolya, V. Korbel, P. Kostka, R. Koutouev, A. Kropivnitskaya, J. Kroseberg, J. Kueckens, T. Kuhr, M. P J Landon, W. Lange, T. Laštovička, P. Laycock, A. Lebedev, B. Leibner, R. Lemrani, V. Lendermann, S. Levonian, B. List, E. Lobodzinska, N. Loktionova, R. Lopez-Fernandez, V. Lubimov, H. Lueders, S. Lüders, D. Lüke, L. Lytkin, A. Makankine, N. Malden, E. Malinovski, S. Mangano, P. Marage, J. Marks, R. Marshall, H. U. Martyn, J. Martyniak, S. J. Maxfield, D. Meer, A. Mehta, K. Meier, A. B. Meyer, H. Meyer, J. Meyer, S. Michine, S. Mikocki, D. Milstead, F. Moreau, A. Morozov, I. Morozov, J. V. Morris, K. Müller, P. Murín, V. Nagovizin, B. Naroska, J. Naumann, Th Naumann, P. R. Newman, F. Niebergall, C. Niebuhr, D. Nikitin, G. Nowak, M. Nozicka, B. Olivier, J. E. Olsson, G. Ossoskov, D. Ozerov, C. Pascaud, G. D. Patel, M. Peez, E. Perez, A. Petrukhin, D. Pitzl, R. Pöschl, B. Povh, N. Raicevic, J. Rauschenberger, P. Reimer, B. Reisert, C. Risler, E. Rizvi, P. Robmann, R. Roosen, A. Rostovtsev, S. Rusakov, K. Rybicki, D. P C Sankey, E. Sauvan, S. Schätzel, J. Scheins, F. P. Schilling, P. Schleper, S. Schmidt, S. Schmitt, M. Schneider, L. Schoeffel, A. Schöning, V. Schröder, H. C. Schultz-Coulon, C. Schwanenberger, K. Sedlák, F. Sefkow, I. Sheviakov, L. N. Shtarkov, Y. Sirois, T. Sloan, P. Smirnov, Y. Soloviev, D. South, V. Spaskov, A. Specka, H. Spitzer, R. Stamen, B. Stella, J. Stiewe, I. Strauch, U. Straumann, G. Thompson, P. D. Thompson, F. Tomasz, D. Traynor, P. Truöl, G. Tsipolitis, I. Tsurin, J. Turnau, J. E. Turney, E. Tzamariudaki, A. Uraev, M. Urban, A. Usik, S. Valkár, A. Valkárová, C. Vallée, P. van Mechelen, A. Vargas Trevino, S. Vassiliev, Y. Vazdik, C. Veelken, A. Vest, A. Vichnevski, S. Vinokurova, V. Volchinski, K. Wacker, J. Wagner, B. Waugh, G. Weber, R. Weber, D. Wegener, C. Werner, N. Werner, M. Wessels, B. Wessling, M. Winde, G. G. Winter, Ch Wissing, E. E. Woehrling, E. Wünsch, J. Žáček, J. Zálešák, Z. Zhang, A. Zhokin, F. Zomer, M. Zur Nedden

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Dijet production in deep inelastic ep scattering is investigated in the region of low values of the Bjorken-variable x (10-4 <x <10-2) and low photon virtualities Q2 (5 <Q2 <100 GeV2). The measured dijet cross sections are compared with perturbative QCD calculations in next-to-leading order. For most dijet variables studied, these calculations can provide a reasonable description of the data over the full phase space region covered, including the region of very low x. However, large discrepancies at low x and low Q2 are observed for events with small separation in azimuth between the two highest transverse momentum jets. This region of phase space is described better by predictions based on the CCFM evolution equation, which incorporates kt factorized unintegrated parton distributions. A reasonable description can be also obtained using the Color Dipole Model or models incorporating virtual photon structure.
    Original languageEnglish
    Pages (from-to)477-493
    Number of pages16
    JournalEuropean Physical Journal C
    Volume33
    Issue number4
    DOIs
    Publication statusPublished - Mar 2004

    Keywords

    • Deep inelastic scattering; Electron collisions; Elementary particle production; Perturbative QCD (inclusive dijet prodn. at low Bjorken-x in ep deep inelastic scattering compared to predictions of perturbative QCD, Color Dipole Model or models incorporating virtual photon structure); Photon (virtual; inclusive dijet prodn. at low Bjorken-x in ep deep inelastic scattering compared to predictions of perturbative QCD, Color Dipole Model or models incorporating virtual photon structure)

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