Thrust jet analysis of deep-inelastic large-rapidity-gap events

C. Adloff, S. Aid, M. Anderson, V. Andreev, B. Andrieu, V. Arkadov, C. Arndt, I. Ayyaz, A. Babaev, J. Bähr, J. Bán, P. Baranov, E. Barrelet, R. Barschke, W. Bartel, U. Bassler, M. Beck, H. J. Behrend, C. Beier, A. BelousovC. Berger, G. Bernardi, G. Bertrand-Coremans, R. Beyer, P. Biddulph, J. C. Bizot, K. Borras, F. Botterweck, V. Boudry, S. Bourov, A. Braemer, W. Braunschweig, V. Brisson, D. P. Brown, W. Bruckner, P. Bruel, D. Bruncko, C. Brune, J. Bürger, F. W. Büsser, A. Buniatian, S. Burke, G. Buschhorn, D. Calvet, A. J. Campbell, T. Carli, M. Charlet, D. Clarke, B. Clerbaux, S. Cocks, J. G. Contreras, C. Cormack, J. A. Coughlan, M. C. Cousinou, B. E. Cox, G. Cozzika, D. G. Cussans, J. Cvach, S. Dagoret, J. B. Dainton, W. D. Dau, K. Daum, M. David, C. L. Davis, A. de Roeck, E. A. de Wolf, B. Delcourt, M. Dirkmann, P. Dixon, W. Dlugosz, K. T. Donovan, J. D. Dowell, A. Droutskoi, J. Ebert, T. R. Ebert, G. Eckerlin, V. Efremenko, S. Egli, R. Eichler, F. Eisele, E. Eisenhandler, E. Elsen, M. Erdmann, A. B. Fahr, L. Favart, A. Fedotov, R. Felst, J. Feltesse, J. Ferencei, F. Ferrarotto, K. Flamm, M. Fleischer, M. Flieser, G. Flügge, A. Fomenko, J. Formánek, J. M. Foster, G. Franke, E. Gabathuler, K. Gabathuler, F. Gaede, J. Garvey, J. Gayler, M. Gebauer, R. Gerhards, A. Glazov, L. Goerlich, N. Gogitidze, M. Goldberg, B. Gonzalez-Pineiro, I. Gorelov, C. Grab, H. Grüssler, T. Greenshaw, R. K. Griffiths, G. Grindhammer, A. Gruber, C. Gruber, T. Hadig, D. Haidt, L. Hajduk, T. Haller, M. Hampel, W. J. Haynes, B. Heinemann, G. Heinzelmann, R. C W Henderson, S. Hengstmann, H. Henschel, I. Herynek, M. F. Hess, K. Hewitt, K. H. Hiller, C. D. Hilton, J. Hladký, M. Höppner, D. Hoffmann, T. Holtom, R. Horisberger, V. L. Hudgson, M. Hütte, M. Ibbotson, Ç Işsever, H. Itterbeck, M. Jacquet, M. Jaffre, J. Janoth, D. M. Jansen, L. Jönsson, D. P. Johnson, H. Jung, P. I P Kalmus, M. Kander, D. Kant, U. Kathage, J. Katzy, H. H. Kaufmann, O. Kaufmann, M. Kausch, S. Kazarian, I. R. Kenyon, S. Kermiche, C. Keuker, C. Kiesling, M. Klein, C. Kleinwort, G. Knies, J. H. Köhne, H. Kolanoski, S. D. Kolya, V. Korbel, P. Kostka, S. K. Kotelnikov, T. Krämerkämper, M. W. Krasny, H. Krehbiel, D. Krücker, A. Küpper, H. Kuster, M. Kuhlen, T. Kurca, B. Laforge, R. Lahmann, M. P J Landon, W. Lange, U. Langenegger, A. Lebedev, F. Lehner, V. Lemaitre, S. Levonian, M. Lindstroem, J. Lipinski, B. List, G. Lobo, G. C. Lopez, V. Lubimov, D. Lüke, L. Lytkin, N. Magnussen, H. Mahlke-Krüger, E. Malinovski, R. Maraček, P. Marage, J. Marks, R. Marshall, J. Martens, G. Martin, R. Martin, H. U. Martyn, J. Martyniak, T. Mavroidis, S. J. Maxfield, S. J. McMahon, A. Mehta, K. Meier, P. Merkel, F. Metlica, A. Meyer, H. Meyer, J. Meyer, P. O. Meyer, A. Migliori, S. Mikocki, D. Milstead, J. Moeck, F. Moreau, J. V. Morris, E. Mroczko, D. Müller, K. Müller, P. Murín, V. Nagovizin, R. Nahnhauer, B. Naroska, T. Naumann, I. Négri, P. R. Newman, D. Newton, H. K. Nguyen, T. C. Nicholls, F. Niebergall, C. Niebuhr, C. Niedzballa, H. Niggli, G. Nowak, T. Nunnemann, H. Oberlack, J. E. Olsson, D. Ozerov, P. Palmen, E. Panaro, A. Panitch, C. Pascaud, S. Passaggio, G. D. Patel, H. Pawletta, E. Peppel, E. Perez, J. P. Phillips, A. Pieuchot, D. Pitzl, R. Pöschl, G. Pope, B. Povh, K. Rabbertz, P. Reimer, H. Rick, S. Riess, E. Rizvi, P. Robmann, R. Roosen, K. Rosenbauer, A. Rostovtsev, F. Rouse, C. Royon, K. Ruter, S. Rusakov, K. Rybicki, D. P C Sankey, P. Schacht, J. Scheins, S. Schiek, S. Schleif, P. Schleper, W. von Schlippe, D. Schmidt, G. Schmidt, L. Schoeffel, A. Schöning, V. Schröder, E. Schuhmann, H. C. Schultz-Coulon, B. Schwab, F. Sefkow, A. Semenov, V. Shekelyan, I. Sheviakov, L. N. Shtarkov, G. Siegmon, U. Siewert, Y. Sirois, I. O. Skillicorn, T. Sloan, P. Smirnov, M. Smith, V. Solochenko, Y. Soloviev, A. Specka, J. Spiekermann, S. Spielman, H. Spitzer, F. Squinabol, P. Steffen, R. Steinberg, J. Steinhart, B. Stella, A. Stellberger, J. Stiewe, K. Stolze, U. Straumann, W. Struczinski, J. P. Sutton, M. Swart, S. Tapprogge, M. Taševský, V. Tchernyshov, S. Tchetchelnitski, J. Theissen, G. Thompson, P. D. Thompson, N. Tobien, R. Todenhagen, P. Truöl, J. Zálešýk, G. Tsipolitis, J. Turnau, E. Tzamariudaki, P. Uelkes, A. Usik, S. Valkár, A. Valkárový, C. Vallée, P. van Esch, P. van Mechelen, D. Vandenplas, Y. Vazdik, P. Verrecchia, G. Villet, K. Wacker, A. Wagener, M. Wagener, R. Wallny, T. Walter, B. Waugh, G. Weber, M. Weber, D. Wegener, A. Wegner, T. Wengler, M. Werner, L. R. West, S. Wiesand, T. Wilksen, S. Willard, M. Winde, G. G. Winter, C. Wittek, M. Wobisch, H. Wollatz, E. Wünsch, J. Žýček, D. Zarbock, Z. Zhang, A. Zhokin, P. Zini, F. Zomer, J. Zsembery, M. zur Nedden

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    Abstract

    A thrust analysis of Large-Rapidity-Gap events in deep-inelastic ep collisions is presented, using data taken with the H1 detector at HERA in 1994. The average thrust of the final states X, which emerge from the dissociation of virtual photons in the range 10 <Q2 <100 GeV2, grows with hadronic mass MX and implies a dominant 2-jet topology. Thrust is found to decrease with growing Pt, the thrust jet momentum transverse to the photon-proton collision axis. Distributions of P2t are consistent with being independent of MX. They show a strong alignment of the thrust axis with the photon-proton collision axis, and have a large high-Pt tail. The correlation of thrust with MX is similar to that in e+e- annihilation at √see = MX , but with lower values of thrust in the ep data. The data cannot be described by interpreting the dissociated system X as a qq̄ state but inclusion of a substantial fraction of qq̄g parton configurations leads naturally to the observed properties. The soft colour exchange interaction model does not describe the data.
    Original languageEnglish
    Pages (from-to)495-507
    Number of pages12
    JournalEuropean Physical Journal C
    Volume1
    Issue number3-4
    DOIs
    Publication statusPublished - 1998

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