Diffraction dissociation in photoproduction at HERA

C. Adloff, S. Aid, M. Anderson, V. Andreev, B. Andrieu, V. Arkadov, C. Arndt, I. Ayyaz, A. Babaev, J. Bähr, J. Bán, Y. Ban, P. Baranov, E. Barrelet, R. Barschke, W. Bartel, U. Bassler, H. P. Beck, M. Beck, H. J. BehrendA. Belousov, Ch Berger, G. Bernardi, G. Bertrand-Coremans, M. Besançon, R. Beyer, P. Biddulph, P. Bispham, J. C. Bizot, K. Borras, F. Bottenveck, V. Boudry, A. Braemer, W. Braunschweig, V. Brisson, W. Brückner, P. Bruel, D. Bruncko, C. Brune, R. Buchholz, L. Büngener, J. Bürger, F. W. Büsser, A. Buniatian, S. Burke, M. J. Burton, D. Calvet, A. J. Campbell, T. Carli, M. Charlet, D. Clarke, B. Clerbaux, S. Cocks, J. G. Contreras, C. Cormack, J. A. Coughlan, A. Courau, M. C. Cousinou, G. Cozzika, L. Criegee, 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, C. Dollfus, K. T. Donovan, J. D. Dowell, H. B. Dreis, A. Droutskoi, O. Dünger, H. Duhm, J. Ebert, T. R. Ebert, G. Eckerlin, V. Efremenko, S. Egli, R. Eichler, F. Eisele, E. Eisenhandler, E. Elsen, M. Erdmann, W. 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. Fretwurst, E. Gabathuler, K. Gabathuler, F. Gaede, J. Garvey, J. Gayler, M. Gebauer, H. Genzel, R. Gerhards, A. Glazov, L. Goerlich, N. Gogitidze, M. Goldberg, D. Goldner, K. Golec-Biernat, B. Gonzalez-Pineiro, I. Gorelov, C. Grab, H. Grässler, 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, H. Henschel, I. Herynek, M. F. Hess, K. Hewitt, W. Hildesheim, K. H. Hiller, C. D. Hilton, J. Hladký, M. Höppner, D. Hoffmann, T. Holtom, R. Horisberger, V. L. Hudgson, M. Hütte, M. Ibbotson, C. Issever, H. Itterbeck, A. Jacholkowska, C. Jacobsson, M. Jacquet, M. Jaffre, J. Janoth, D. M. Jansen, T. Jansen, L. Jönsson, D. P. Johnson, H. Jung, P. I.P. Kalmus, M. Kander, D. Kant, R. Kaschowitz, 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, T. Köhler, J. H. Köhne, H. Kolanoski, S. D. Kolya, V. Korbel, P. Kostka, S. K. Kotelnikov, T. Krämerkämper, M. W. Krasny, H. Krehbiel, D. Krücker, H. Küster, M. Kuhlen, T. Kurča, J. Kurzhöfer, B. Laforge, M. P.J. Landon, W. Lange, U. Langenegger, A. Lebedev, F. Lehner, V. Lemaitre, S. Levonian, G. Lindström, M. Lindstroem, F. Linsel, J. Lipinski, B. List, G. Lobo, P. Loch, J. W. Lomas, G. C. Lopez, V. Lubimov, D. Lüke, L. Lytkin, N. Magnussen, 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, 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, G. Müller, K. Müller, P. Murín, V. Nagovizin, R. Nahnhauer, B. Naroska, Th Naumann, I. Négri, P. R. Newman, D. Newton, H. K. Nguyen, T. C. Nicholls, F. Niebergall, C. Niebuhr, Ch Niedzballa, H. Niggli, G. Nowak, T. Nunnemann, M. Nyberg-Werther, H. Oberlack, J. E. Olsson, D. Ozerov, P. Palmen, E. Panaro, A. Pahitch, 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, S. Prell, K. Rabbertz, G. Rädel, P. Reimer, H. Rick, S. Riess, E. Rizvi, P. Robmann, R. Roosen, K. Rosenbauer, A. Rostovtsev, F. Rouse, C. Royon, K. Rüter, S. Rusakov, K. Rybicki, D. P.C. Sankey, P. Schacht, S. Schick, S. Schleif, P. Schleper, W. Von Schlippe, D. Schmidt, G. Schmidt, L. Schoeffel, A. Schöning, V. Schröder, E. Schuhmann, 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, H. Steiner, J. Steinhart, B. Stella, A. Stellberger, J. Stier, J. Stiewe, U. Stößlein, K. Stolze, U. Straumann, W. Struczinski, J. P. Sutton, S. Tapprogge, M. Taševský, V. Tchernyshov, S. Tchetchelnitski, Ki J. Theissen, C. Thiebaux, G. Thompson, N. Tobien, R. Todenhagen, P. Truöl, G. Tsipolitis, J. Turnau, E. Tzamariudaki, P. Uelkes, A. Usik, S. Valkár, A. Valkárová, C. Vallée, P. Van Esch, P. Van Mechelen, D. Vandenplas, Y. Vazdik, P. Verrecchia, G. Villet, K. Wacker, A. Wagener, M. Wagener, B. Waugh, G. Weber, M. Weber, D. Wegener, A. Wegner, T. Wengler, M. Werner, L. R. West, T. Wilksen, S. Willard, M. Winde, G. G. Winter, C. Wittek, M. Wobisch, H. Wollatz, E. Wünsch, J. Žáček, D. Zarbock, Z. Zhang, A. Zhokin, P. Zini, F. Zomer, J. Zsembery, K. Zuber, M. ZurNedden

Research output: Contribution to journalArticlepeer-review

94 Scopus citations

Abstract

A study is presented of the process γp → XY, where there is a large rapidity gap between the systems X and Y. Measurements are made of the differential cross section as a function of the invariant mass Mx of the system produced at the photon vertex. Results are presented at centre of mass energies of (W) = 187 GeV and 〈W〉 = 231 GeV, both where the proton dominantly remains intact and, for the first time, where it dissociates. Both the centre of mass energy and the Mx2 dependence of HERA data and those from a fixed target experiment may simultaneously be described in a triple-Regge model. The low mass photon dissociation process is found to be dominated by diffraction, though a sizable subleading contribution is present at larger masses. The pomeron intercept is extracted and found to be αP(0) = 1.068 ± 0.016 (stat.) ± 0.022 (syst.) ± 0.041 (model), in good agreement with values obtained from total and elastic hadronic and photoproduction cross sections. The diffractive contribution to the process γp → Xp with Mx2/W2 < 0.05 is measured to be 22.2 ± 0.6 (stat.) ± 2.6 (syst.) ± 1.7 (model) % of the total γp cross section at 〈W〉 = 187 GeV.

Original languageEnglish (US)
Pages (from-to)221-235
Number of pages15
JournalZeitschrift fur Physik C-Particles and Fields
Volume74
Issue number2
DOIs
StatePublished - Apr 1997
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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