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Observation of events with an isolated high energy lepton and missing transverse momentum at HERA

  • C. Adloff
  • , M. Anderson
  • , V. Andreev
  • , B. Andrieu
  • , V. Arkadov
  • , C. Arndt
  • , I. Ayyaz
  • , A. Babaev
  • , J. Bähr
  • , J. Ban
  • , P. Baranov
  • , E. Barrelet
  • , R. Barschke
  • , W. Bartel
  • , U. Bassler
  • , P. Bate
  • , M. Beck
  • , A. Beglarian
  • , O. Behnke
  • , H. J. Behrend
  • C. Beier, A. Belousov, C. Berger, G. Bernardi, G. Bertrand-Coremans, P. Biddulph, J. C. Bizot, V. Boudry, A. Braemer, W. Braunschweig, V. Brisson, D. P. Brown, W. Bräckner, P. Bruel, D. Bruncko, J. Burger, F. W. Bässer, A. Buniatian, S. Burke, G. Buschhorn, D. Calvet, A. J. Campbell, T. Carli, E. Chabert, M. Charlet, D. Clarke, B. Clerbaux, S. Cocks, J. G. Contreras, C. Cormack, J. A. Coughlan, M. C. Cousinou, B. E. Cox, G. Cozzika, J. Cvach, J. B. Dainton, W. D. Dau, K. Daum, M. David, M. Davidsson, A. de Roeck, E. A. de Wolf, B. Delcourt, C. Diaconu, M. Dirkmann, P. Dixon, W. Dlugosz, K. T. Donovan, J. D. Dowell, A. Droutskoi, J. Ebert, G. Eckerlin, D. Eckstein, V. Efremenko, S. Egli, R. Eichler, F. Eisele, E. Eisenhandler, E. Elsen, M. Enzenberger, M. Erdmann, A. B. Fahr, L. Favart, A. Fedotov, R. Felst, J. Feltesse, J. Ferencei, F. Ferrarotto, M. Fleischer, G. Flugge, A. Fomenko, J. Formanek, J. M. Foster, G. Franke, E. Gabathuler, K. Gabathuler, F. Gaede, J. Garvey, J. Gayler, M. Gebauer, R. Gerhards, S. Ghazaryan, A. Glazov, L. Goerlich, N. Gogitidze, M. Goldberg, I. Gorelov, C. Grab, H. Grassler, T. Greenshaw, R. K. Griffiths, G. Grindhammer, C. Gruber, T. Hadig, D. Haidt, L. Hajduk, T. Haller, M. Hampel, V. Haustein, W. J. Haynes, B. Heinemann, G. Heinzelmann, R. C.W. Henderson, S. Hengstmann, H. Henschel, R. Heremans, I. Herynek, K. Hewitt, K. H. Hiller, C. D. Hilton, J. Hladký, D. Hoffmann, T. Holtom, R. Horisberger, V. L. Hudgson, S. Hurling, M. Ibbotson, C. işsever, H. Itterbeck, M. Jacquet, M. Jaffre, D. M. Jansen, L. Jänsson, D. P. Johnson, H. Jung, H. C. Kaestli, M. Kander, D. Kant, M. Karlsson, U. Kathage, J. Katzy, H. H. Kaufmann, O. Kaufmann, M. Kausch, I. R. Kenyon, S. Kermiche, C. Keuker, C. Kiesling, M. Klein, C. Kleinwort, G. Knies, J. H. Kähne, H. Kolanoski, S. D. Kolya, V. Korbel, P. Kostka, S. K. Kotelnikov, T. Krämerkamper, M. W. Krasny, H. Krehbiel, D. Kriicker, A. Kupper, H. Käster, M. Kuhlen, T. Kurča, B. Laforge, R. Lahmann, M. P.J. Landon, W. Lange, U. Langenegger, A. Lebedev, F. Lehner, V. Lemaitre, S. Levonian, M. Lindstroem, B. List, G. Lobo, V. Lubimov, D. Luke, L. Lytkin, N. Magnussen, H. Mahlke-Krüger, E. Malinovski, R. Maraček, P. Marage, J. Marks, R. Marshall, G. Martin, H. U. Martyn, J. Martyniak, S. J. Maxfield, S. J. McMahon, T. R. 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, R. Mohr, S. Mohrdieck, F. Moreau, J. V. Morris, E. Mroczko, D. Muller, K. Muller, P. Murín, V. Nagovizin, B. Naroska, T. Naumann, I. Negri, P. R. Newman, D. Newton, H. K. Nguyen, T. C. Nicholls, F. Niebergall, C. Niebuhr, C. Niedzballa, H. Niggli, O. Nix, 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. Poschl, G. Pope, B. Povh, K. Rabbertz, P. Reimer, B. Reisert, H. Rick, S. Riess, E. Rizvi, P. Robmann, R. Roosen, K. Rosenbauer, A. Rostovtsev, F. Rouse, C. Royon, S. Rusakov, K. Rybicki, D. P.C. Sankey, P. Schacht, J. Scheins, S. Schiek, S. Schleif, P. Schleper, D. Schmidt, G. Schmidt, L. Schoeffel, A. Schoning, V. Schräder, 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, H. Spitzer, F. Squinabol, P. Steffen, R. Steinberg, J. Steinhart, B. Stella, A. Stellberger, J. Stiewe, U. Straumann, W. Struczinski, J. P. Sutton, M. Swart, S. Tapprogge, M. Tasevsky, V. Tchernyshov, S. Tchetchelnitski, J. Theissen, G. Thompson, P. D. Thompson, N. Tobien, R. Todenhagen, P. Truol, G. Tsipolitis, J. Turnau, E. Tzamariudaki, S. Udluft, A. Usik, S. Valkar, A. Valkarový, C. Vallee, P. van Esch, P. van Mechelen, Y. Vazdik, G. Villet, K. Wacker, 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, E. Wittmann, M. Wobisch, H. Wollatz, E. Wänsch, J. Žáček, J. Zálešák, Z. Zhang, A. Zhokin, P. Zini, F. Zomer, J. Zsembery, M. zurNedden
  • Bergische Universität Gesamthochschule Wuppertal
  • University of Manchester
  • P.N. Lebedev Physical Institute of the Russian Academy of Sciences
  • c/o DESY
  • Universités Paris VI and VII
  • Institute for Theoretical and Experimental Physics
  • Slovak Academy of Sciences
  • Max-Planck-Institut für Kernphysik
  • Yerevan Physics Institute
  • University of Heidelberg
  • RWTH Aachen University
  • Inter-University Institute for High Energies ULB-VUB
  • Laboratoire de l'Accélérateur Linéaire
  • Universität Hamburg
  • University Roma Tre
  • Lancaster University
  • Max-Planck-Institut für Physik
  • Aix-Marseille Université
  • CCLRC Rutherford Appleton Laboratory
  • University of Liverpool
  • University of Dortmund
  • Institut Pierre Simon Laplace, CNRS and CEA
  • Institute of Physics of the Czech Academy of Sciences
  • Christian-Albrechts-University Kiel
  • Lund University
  • Queen Mary University of London
  • University of California, Davis
  • University of Birmingham
  • Physik-Institut der Universität Zürich
  • ETH Zurich
  • Universität Karlsruhe/Forschungszentrum Karlsruhe
  • Charles University
  • Paul Scherrer Institut
  • Institute for Nuclear Physics
  • Humboldt-Universität zu Berlin
  • University of Glasgow

Résultats de recherche: Contribution à un journalArticleRevue par des pairs

Résumé

A search for events with an imbalance in transverse momentum and with isolated high energy leptons has been carried out at the positron-proton collider HERA. One event with an e- and five events with a μ± are found together with evidence for undetected particles carrying transverse momentum. Within the Standard Model the dominant origin of events with this kind of topology is the production of W bosons with subsequent leptonic decay. Three of the six events are within measurement errors found in a region of phase space likely to be populated by this process, while the remaining events show kinematic properties which are atypical of all Standard Model processes considered.

langue originaleAnglais
Pages (de - à)575-584
Nombre de pages10
journalEuropean Physical Journal C
Volume5
Numéro de publication4
Les DOIs
étatPublié - 1 janv. 1998

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