Observation of Events at Very High $Q^2$ in ep Collisions at HERA

Autor: Adloff, C, Aid, S, Anderson, M, Andreev, V, Andrieu, B, Arkadov, V, Arndt, C, Ayyaz, I, Babaev, A, Bahr, J, Ban, J, Ban, Y, Baranov, P, Barrelet, E, Barschke, R, Bartel, W, Bassler, U, Beck, HP, Beck, M, Behrend, HJ, Belousov, A, Berger, C, Bernardi, G, BertrandCoremans, G, Beyer, R, Biddulph, P, Bispham, P, Bizot, JC, Borras, K, Botterweck, F, Boudry, V, Bourov, S, Braemer, A, Braunschweig, W, Brisson, V, Bruckner, W, Bruel, P, Bruncko, D, Brune, C, Buchholz, R, Bungener, L, Burger, J, Busser, FW, Buniatian, A, Burke, S, Buschhorn, G, Calvet, D, Campbell, AJ, Carli, T, Charlet, M, Clarke, D, Clerbaux, B, Cocks, S, Contreras, JG, Cormack, C, Coughlan, JA, Courau, A, Cousinou, MC, Cox, BD, Cozzika, G, Criegee, L, Cussans, DG, Cvach, J, Dagoret, S, Dainton, JB, Dau, WD, Daum, K, David, M, Davis, CL, DeRoeck, A, DeWolf, EA, Delcourt, B, Dirkmann, M, Dixon, P, Dlugosz, W, Dollfus, C, Donovan, KT, Dowell, JD, Dreis, HB, Droutskoi, A, Dunger, O, Ebert, J, Ebert, TR, Eckerlin, G, Efremenko, V, Egli, S, Eichler, R, Eisele, F, Eisenhandler, E, Elsen, E, Erdmann, M, Fahr, AB, Favart, L, Fedotov, A, Felst, R, Feltesse, J, Ferencei, J, Ferrarotto, F, Flamm, K, Fleischer, M, Flieser, M, Flugge, G, Fomenko, A, Formanek, J, Foster, JM, Franke, G, Fretwurst, E, Gabathuler, E, Gabathuler, K, Gaede, F, Garvey, J, Gayler, J, Gebauer, M, Genzel, H, Gerhards, R, Glazov, A, Goerlich, L, Gogitidze, N, Goldberg, M, Goldner, D, GolecBiernat, K, GonzalezPineiro, B, Gorelov, I, Grab, C, Grassler, H, Greenshaw, T, Griffiths, RK, Grindhammer, G, Gruber, A, Gruber, C, Hadig, T, Haidt, D, Hajduk, L, Haller, T, Hampel, M, Haynes, WJ, Heinemann, B, Heinzelmann, G, Henderson, RCW, Henschel, H, Herynek, I, Hess, MF, Hewitt, K, Hiller, KH, Hilton, CD, Hladky, J, Hoppner, M, Hoffmann, D, Holtom, T, Horisberger, R, Hudgson, VL, Hutte, M, Ibbotson, M, Issever, C, Itterbeck, H, Jacholkowska, A, Jacobsson, C, Jacquet, M, Jaffre, M, Janoth, J, Jansen, DM, Jansen, T, Jonsson, L, Johnson, DP, Jung, H, Kalmus, PIP, Kander, M, Kant, D, Kaschowitz, R, Kathage, U, Katzy, J, Kaufmann, HH, Kaufmann, O, Kausch, M, Kazarian, S, Kenyon, IR, Kermiche, S, Keuker, C, Kiesling, C, Klein, M, Kleinwort, C, Knies, G, Kohler, T, Kohne, JH, Kolanoski, H, Kolya, SD, Korbel, V, Kostka, P, Kotelnikov, SK, Kramerkamper, T, Krasny, MW, Krebbiel, H, Krucker, D, Kupper, A, Kuster, H, Kuhlen, M, Kurca, T, Kurzhofer, J, Laforge, B, Landon, MPJ, Lange, W, Langenegger, U, Lebedev, A, Lehner, F, Lemaitre, V, Levonian, S, Lindstrom, G, Lindstroem, M, Linsel, F, Lipinski, J, List, B, Lobo, G, Lopez, GC, Lubimov, V, Luke, D, Lytkin, L, Magnussen, N, MahlkeKruger, H, Malinovski, E, Maracek, R, Marage, P, Marks, J, Marshall, R, Martens, J, Martin, G, Martin, R, Martyn, HU, Martyniak, J, Mavroidis, T, Maxfield, SJ, McMahon, SJ, Mehta, A, Meier, K, Merkel, P, Metlica, F, Meyer, A, Meyer, H, Meyer, J, Meyer, PO, Migliori, A, Mikocki, S, Milstead, D, Moeck, J, Moreau, F, Morris, JV, Mroczko, E, Muller, D, Muller, K, Murin, P, Nagovizin, V, Nahnhauer, R, Naroska, B, Naumann, T, Negri, I, Newman, PR, Newton, D, Nguyen, HK, Nicholls, TC, Niebergall, F, Niebuhr, C, Niedzballa, C, Niggli, H, Nowak, G, Nunnemann, T, NybergWerther, M, Oberlack, H, Olsson, JE, Ozerov, D, Palmen, P, Panaro, E, Panitch, A, Pascaud, C, Passaggio, S, Patel, GD, Pawletta, H, Peppel, E, Perez, E, Phillips, JP, Pieuchot, A, Pitzl, D, Poschl, R, Pope, G, Povh, B, Prell, S, Rabbertz, K, Reimer, P, Rick, H, Riess, S, Rizvi, E, Robmann, P, Roosen, R, Rosenbauer, K, Rostovtsev, A, Rouse, F, Royon, C, Ruter, K, Rusakov, S, Rybicki, K, Sankey, DPC, Schacht, P, Schiek, S, Schleif, S, Schleper, P, vonSchlippe, W, Schmidt, D, Schmidt, G, Schoeffel, L, Schoning, A, Schroder, V, Schuhmann, E, Schwab, B, Sefkow, F, Semenov, A, Shekelyan, V, Sheviakov, I, Shtarkov, LN, Siegmon, G, Siewert, U, Sirois, Y, Skillicorn, IO, Sloan, T, Smirnov, P, Smith, M, Solochenko, V, Soloviev, Y, Specka, A, Spiekermann, J, Spielman, S, Spitzer, H, Squinabol, F, Steffen, P, Steinberg, R, Steinhart, J, Stella, B, Stellberger, A, Stier, J, Stiewe, J, Stosslein, U, Stolze, K, Straumann, U, Struczinski, W, Sutton, JP, Tapprogge, S, Tasevsky, M, Tchernyshov, V, Tchetchelnitski, S, Theissen, J, Thiebaux, C, Thompson, G, Thompson, PD, Tobien, N, Todenhagen, R, Truol, P, Tsipolitis, G, Turnau, J, Tzamariudaki, E, Uelkes, P, Usik, A, Valkar, S, Valkarova, A, Vallee, C, VanEsch, P, VanMechelen, P, Vandenplas, D, Vazdik, Y, Verrecchia, P, Villet, G, Wacker, K, Wagener, A, Wagener, M, Wallny, R, Waugh, B, Weber, G, Weber, M, Wegener, D, Wegner, A, Wengler, T, Werner, M, West, LR, Wiesand, S, Wilksen, T, Willard, S, Winde, M, Winter, GG, Wittek, C, Wobisch, M, Wollatz, H, Wunsch, E, Zacek, J, Zarbock, D, Zhang, Z, Zhokin, A, Zini, P, Zomer, F, Zsembery, J, Zuber, K, zurNedden, M
Přispěvatelé: Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC), Laboratoire de l'Accélérateur Linéaire (LAL), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), H1, Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Jazyk: angličtina
Rok vydání: 1997
Předmět:
Zdroj: Zeitschrift für Physik C Particles and Fields
Zeitschrift für Physik C Particles and Fields, Springer Verlag, 1997, 74, pp.191-206
Zeitschrift für Physik C Particles and Fields, 1997, 74, pp.191-206
ISSN: 0170-9739
1434-6052
Popis: Measurements of ep scattering with squared 4-momentum transfer Q^2 up to 35000 GeV^2 are compared with the expectation of the standard deep-inelastic model of lepton-nucleon scattering (DIS). For Q^2 > 15000 GeV^2, N_{obs} =12 neutral current candidate events are observed where the expectation is N_DIS = 4.71 \pm 0.76 events. In the same Q^2 range, N_{obs} =4 charged current candidates are observed where the expectation is N_{DIS} = 1.77 \pm 0.87 events. The probability P(N \geq N_{obs}) that the DIS model signal N fluctuates to N \geq N_{obs} in a random set of experiments is 6 10^{-3} for neutral current and 0.14 for charged current. The difference in the observed and expected number of Neutral Current events is mostly due to events at large masses M = sqrt{xs} in which the positron is backscattered at large y = Q^2/M^2.
30 pages, latex, 8 Figures
Databáze: OpenAIRE