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. BehrendC. 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

    Research output: Contribution to journalArticlepeer-review

    Abstract

    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.
    Original languageEnglish
    Pages (from-to)575-584
    Number of pages9
    JournalEuropean Physical Journal C
    Volume5
    Issue number4
    DOIs
    Publication statusPublished - 1998

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