Energy flow and rapidity gaps between jets in photoproduction at HERA: The H1 collaboration

C. Adloff, V. Andreev, B. Andrieu, T. Anthonis, V. Arkadov, A. Astvatsatourov, A. Babaev, J. Bähr, P. Baranov, E. Barrelet, W. Bartel, P. Bate, J. Becker, A. Beglarian, O. Behnke, C. Beier, A. Belousov, T. Benisch, Ch Berger, T. BerndtJ. C. Bizot, J. Boehme, V. Boudry, W. Braunschweig, V. Brisson, H. B. Bröker, D. P. Brown, W. Brückner, D. Bruncko, J. Bürger, F. W. Büsser, A. Bunyatyan, A. Burrage, G. Buschhorn, L. Bystritskaya, A. J. Campbell, J. Cao, S. Caron, F. Cassol-Brunner, 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, M. Davidsson, B. Delcourt, N. Delerue, R. Demirchyan, A. De Roeck, E. A. De Wolf, C. Diaconu, J. Dingfelder, P. Dixon, V. Dodonov, J. D. Dowell, A. Droutskoi, A. Dubak, C. Duprel, G. Eckerlin, D. Eckstein, V. Efremenko, S. Egli, R. Eichler, F. Eisele, E. Eisenhandler, M. Ellerbrock, E. Elsen, M. Erdmann, W. Erdmann, P. J W Faulkner, L. Favart, A. Fedotov, R. Felst, J. Ferencei, S. Ferron, M. Fleischer, Y. H. Fleming, G. Flügge, A. Fomenko, I. Foresti, J. Formánek, G. Franke, E. Gabathuler, K. Gabathuler, J. Garvey, J. Gassner, J. Gayler, R. Gerhards, C. Gerlich, S. Ghazaryan, L. Goerlich, N. Gogitidze, C. Grab, H. Grässler, T. Greenshaw, G. Grindhammer, T. Hadig, D. Haidt, L. Hajduk, J. Haller, W. J. Haynes, B. Heinemann, G. Heinzelmann, R. C W Henderson, S. Hengstmann, H. Henschel, R. Heremans, G. Herrera, I. Herynek, M. Hildebrandt, M. Hilgers, K. H. Hiller, J. Hladký, P. Hüting, D. Hoffmann, R. Horisberger, S. Hurling, M. Ibbotson, Ç Işsever, M. Jacquet, M. Jaffre, L. Janauschek, X. Janssen, V. Jemanov, L. Jönsson, C. Johnson, D. P. Johnson, M. A S Jones, H. Jung, D. Kant, M. Kapichine, M. Karlsson, O. Karschnick, F. Keil, N. Keller, J. Kennedy, I. R. Kenyon, S. Kermiche, C. Kiesling, P. Kjellberg, M. Klein, C. Kleinwort, T. Kluge, G. Knies, B. Koblitz, S. D. Kolya, V. Korbel, P. Kostka, S. K. Kotelnikov, R. Koutouev, A. Koutov, H. Krehbiel, J. Kroseberg, K. Krüger, A. Küpper, T. Kuhr, T. Kurča, D. Lamb, M. P J Landon, W. Lange, T. Laštovička, P. Laycock, E. Lebailly, A. Lebedev, B. Leißbner, R. Lemrani, V. Lendermann, S. Levonian, M. Lindstroem, B. List, E. Lobodzinska, B. Lobodzinski, A. Loginov, N. Loktionova, V. Lubimov, S. Lüders, D. Lüke, L. Lytkin, H. Mahlke-Krüger, N. Malden, E. Malinovski, I. Malinovski, R. Maraček, 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, P. O. Meyer, S. Mikocki, D. Milstead, T. Mkrtchyan, R. Mohr, S. Mohrdieck, M. N. Mondragon, F. Moreau, A. Morozov, J. V. Morris, K. Müller, P. Murín, V. Nagovizin, B. Naroska, J. Naumann, Th Naumann, G. Nellen, P. R. Newman, T. C. Nicholls, F. Niebergall, C. Niebuhr, O. Nix, G. Nowak, J. E. Olsson, D. Ozerov, V. Panassik, C. Pascaud, G. D. Patel, M. Peez, E. Perez, J. P. Phillips, D. Pitzl, R. Pöschl, I. Potachnikova, B. Povh, G. Rädel, J. Rauschenberger, P. Reimer, B. Reisert, D. Reyna, C. Risler, E. Rizvi, P. Robmann, R. Roosen, A. Rostovtsev, S. Rusakov, K. Rybicki, D. P C Sankey, S. Schätzel, J. Scheins, F. P. Schilling, P. Schleper, D. Schmidt, S. Schmidt, S. Schmitt, M. Schneider, L. Schoeffel, A. Schöning, T. Schörner, V. Schröder, H. C. Schultz-Coulon, C. Schwanenberger, K. Sedlák, F. Sefkow, V. Shekelyan, 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, U. Straumann, M. Swart, M. Taševský, S. Tchetchelnitski, G. Thompson, P. D. Thompson, N. Tobien, D. Traynor, P. Truöl, G. Tsipolitis, I. Tsurin, J. Turnau, J. E. Turney, E. Tzamariudaki, S. Udluft, M. Urban, A. Usik, S. Valkár, A. Valkárová, C. Vallée, P. Van Mechelen, S. Vassiliev, Y. Vazdik, A. Vichnevski, K. Wacker, J. Wagner, R. Wallny, B. Waugh, G. Weber, M. Weber, D. Wegener, C. Werner, M. Werner, N. Werner, M. Wessels, G. White, S. Wiesand, T. Wilksen, M. Winde, G. G. Winter, Ch Wissing, M. Wobisch, E. E. Woehrling, E. Wunsch, A. C. Wyatt, J. Žáček, J. Zálešák, Z. Zhang, A. Zhokin, F. Zomer, M. zur Nedden

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Dijet events in photon-proton collisions in which there is a large pseudorapidity separation Δη > 2.5 between the two highest ET jets are studied with the H1 detector at HERA. The inclusive dijet cross sections are measured as functions of the longitudinal momentum fractions of the proton and photon which participate in the production of the jets, xpjets and xγjets respectively, Δη, the pseudorapidity separation between the two highest ET jets, and ETgap, the total summed transverse energy between the jets. Rapidity gap events are defined as events in which ETgap is less than ETcut, for ETcut varied between 0.5 and 2.0 GeV. The fraction of dijet events with a rapidity gap is measured differentially in Δη, xpjets and xγjets. An excess of events with rapidity gaps at low values of ETcut is observed above the expectation from standard photoproduction processes. This excess can be explained by the exchange of a strongly interacting colour singlet object between the jets.
    Original languageEnglish
    Pages (from-to)517-527
    Number of pages10
    JournalEuropean Physical Journal C
    Volume24
    Issue number4
    DOIs
    Publication statusPublished - Aug 2002

    Keywords

    • High Energy Physics - Experiment

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