Comparison of ZEUS data with standard model predictions for e+p → e+X scattering at high x and Q2

J. Breitweg*, M. Derrick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, J. Repond, R. Stanek, R. L. Talaga, R. Yoshida, H. Zhang, M. C.K. Mattingly, F. Anselmo, P. Antonioli, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. BruniG. Cara Romeo, G. Castellini, L. Cifarelli, F. Cindolo, A. Contin, M. Corradi, S. De Pasquale, I. Gialas, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, A. Margotti, T. Massam, R. Nania, F. Palmonari, A. Pesci, A. Polini, G. Sartorelli, Y. Zamora Garcia, A. Zichichi, C. Amelung, A. Bornheim, I. Brock, K. Coböken, J. Crittenden, R. Deffner, M. Eckert, L. Feld, M. Grothe, H. Hartmann, K. Heinlolh, L. Heinz, E. Hilger, H. P. Jakob, U. F. Katz, E. Paul, M. Pfeiffer, Ch Rembser, J. Stamm, R. Wedemeyer, D. S. Bailey, S. Campbell-Robson, W. N. Cottingham, B. Foster, R. Hall-Wilton, M. E. Hayes, G. P. Heath, H. F. Heath, D. Piccioni, D. G. Roff, R. J. Tapper, M. Arneodo, R. Ayad, M. Capua, A. Garfagnini, L. Iannotti, M. Schioppa, G. Susinno, J. Y. Kim, J. H. Lee, I. T. Lim, M. Y. Pac, A. Caldwell, N. Cartiglia, Z. Jing, W. Liu, J. A. Parsons, S. Ritz, S. Sampson, F. Sciulli, P. B. Straub, Q. Zhu, P. Borzemski, J. Chwastowski, A. Eskreys, Z. Jakubowski, M. B. Przybycień, M. Zachara, L. Zawiejski, L. Adamczyk, B. Bednarek, K. Jeleń, D. Kisielewska, T. Kowalski, E. Rulikowska-Zarȩbska, L. Suszycki, J. Zaja̧c, Z. Duliński, A. Kotański, G. Abbiendi, L. A.T. Bauerdick, U. Behrens, H. Beier, J. K. Bienlein, G. Cases, O. Deppe, K. Desler, G. Drews, D. J. Gilkinson, C. Glasman, P. Göttlicher, J. Große-Knetter, T. Haas, W. Hain, D. Hasell, H. Heßling, Y. Iga, K. F. Johnson, M. Kasemann, W. Koch, U. Kötz, H. Kowalski, J. Labs, L. Lindemann, B. Löhr, M. Löwe, J. Mainusch, O. Mańczak, J. Milewski, T. Monteiro, J. S.T. Ng, D. Notz, K. Ohrenberg, I. H. Park, A. Pellegrino, F. Pelucchi, K. Piotrzkowski, M. Roco, M. Rohde, J. Roldán, A. A. Savin, U. Schneekloth, W. Schulz, F. Selonke, B. Surrow, E. Tassi, T. Voß, D. Westphal, G. Wolf, U. Wollmer, C. Youngman, A. F. Zarnecki, W. Zeuner, B. D. Burow, H. J. Grabosch, A. Meyer, S. Schlenstedt, G. Barbagli, E. Gallo, P. Pelfer, G. Maccarrone, L. Votano, A. Bamberger, S. Eisenhardt, P. Markun, T. Trefzger, S. Wölfle, J. T. Bromley, N. H. Brook, P. J. Bussey, A. T. Doyle, D. H. Saxon, L. E. Sinclair, E. Strickland, M. L. Utley, R. Waugh, A. S. Wilson, I. Bohnet, N. Gendner, U. Holm, A. Meyer-Larsen, H. Salehi, K. Wick, L. K. Gladilin, R. Klanner, E. Lohrmann, G. Poelz, W. Schott, F. Zetsche, T. C. Bacon, I. Butterworth, J. E. Cole, V. L. Harris, G. Howell, B. H.Y. Hung, L. Lamberti, K. R. Long, D. B. Miller, N. Pavel, A. Prinias, J. K. Sedgbeer, D. Sideris, A. F. Whitfield, U. Mallik, S. M. Wang, J. T. Wu, P. Cloth, D. Filges, S. H. An, S. B. Lee, S. W. Nam, H. S. Park, S. K. Park, F. Barreiro, J. P. Fernandez, R. Graciani, J. M. Hernández, L. Hervás, L. Labarga, M. Martinez, J. Del Peso, J. Puga, J. Terron, J. F. De Trocóniz, F. Corriveau, D. S. Hanna, J. Hartmann, L. W. Hung, J. N. Lim, W. N. Murray, A. Ochs, M. Riveline, D. G. Stairs, M. St-Laurent, R. Ullmann, T. Tsurugai, V. Bashkirov, B. A. Dolgoshein, A. Stifutkin, G. L. Bashindzhagyan, P. F. Ermolov, Yu A. Golubkov, V. D. Kobrin, I. A. Korzhavina, V. A. Kuzmin, O. Yu Lukina, A. S. Proskuryakov, L. M. Shcheglova, A. N. Solomin, N. P. Zotov, C. Bokel, M. Botje, N. Brümmer, F. Chlebana, J. Engelen, M. De Kamps, P. Kooijman, A. Kruse, A. Van Sighem, H. Tiecke, W. Verkerke, J. Vossebeld, M. Vreeswijk, L. Wiggers, E. De Wolf, D. Acosta, B. Bylsma, L. S. Durkin, J. Gilmore, C. M. Ginsburg, C. L. Kim, T. Y. Ling, P. Nylander, T. A. Romanowski, H. E. Blaikley, R. J. Cashmore, A. M. Cooper-Sarkar, R. C.E. Devenish, J. K. Edmonds, N. Harnew, M. Lancaster, J. D. McFall, C. Nath, V. A. Noyes, A. Quadt, J. R. Tickner, H. Uijterwaal, R. Walczak, D. S. Waters, T. Yip, A. Bertolin, R. Brugnera, R. Carlin, F. Dal Corso, U. Dosselli, S. Limentani, M. Morandin, M. Posocco, L. Stanco, R. Stroili, C. Voci, J. Bulmahn, R. G. Feild, B. Y. Oh, J. R. Okrasiński, J. J. Whitmore, G. Marini, A. Nigro, J. C. Hart, N. A. McCubbin, T. P. Shah, E. Barberis, T. Dubbs, C. Heusch, M. Van Hook, W. Lockman, J. T. Rahn, H. F.W. Sadrozinski, A. Seiden, D. C. Williams, O. Schwarzer, A. H. Walenta, H. Abramowicz, G. Briskin, S. Dagan, T. Doeker, S. Kananov, A. Levy, T. Abe, J. I. Fleck, M. Inuzuka, T. Ishii, M. Kuze, K. Nagano, M. Nakao, I. Suzuki, K. Tokushuku, K. Umemori, S. Yamada, Y. Yamazaki, R. Hamatsu, T. Hirose, K. Homma, S. Kitamura, T. Matsushita, K. Yamauchi, R. Cirio, M. Costa, M. I. Ferrero, S. Maselli, V. Monaco, C. Peroni, M. C. Petrucci, R. Sacchi, A. Solano, A. Staiano, M. Dardo, D. C. Bailey, M. Brkic, C. P. Fagerstroem, G. F. Hartner, K. K. Joo, G. M. Levman, J. F. Martin, R. S. Orr, S. Polenz, C. R. Sampson, D. Simmons, R. J. Teuscher, J. M. Butterworth, C. D. Catterall, T. W. Jones, P. B. Kaziewicz, J. B. Lane, R. L. Saunders, J. Shulman, M. R. Sutton, B. Lu, L. W. Mo, J. Ciborowski, G. Grzelak, M. Kasprzak, K. Muchorowski, R. J. Nowak, J. M. Pawlak, R. Pawlak, T. Tymieniecka, A. K. Wróblewski, J. A. Zakrzewski, M. Adamus, C. Coldewey, Y. Eisenberg, D. Hochman, U. Karshon, D. Revel, W. F. Badgett, D. Chapin, R. Cross, S. Dasu, C. Foudas, R. J. Loveless, S. Mattingly, D. D. Reeder, W. H. Smith, A. Vaiciulis, M. Wodarczyk, S. Bhadra, W. R. Frisken, M. Khakzad, W. B. Schmidke

*Corresponding author for this work

Research output: Contribution to journalReview articlepeer-review

197 Scopus citations

Abstract

Using the ZEUS detector at HERA, we have studied the reaction e+p → e+X for Q2 > 5000 GeV2 with a 20.1 pb-1 data sample collected during the years 1994 to 1996. For Q2 below 15000 GeV2, the data are in good agreement with Standard Model expectations. For Q2 > 35000 GeV2, two events are observed while 0.145 ± 0.013 events are expected. A statistical analysis of a large ensemble of simulated Standard Model experiments indicates that with probability 6.0%, an excess at least as unlikely as that observed would occur above some Q2 cut. For x > 0.55 and y > 0.25, four events are observed where 0.91 ± 0.08 events are expected. A statistical analysis of the two-dimensional distribution of the events in x and y yields a probability of 0.72% for the region x > 0.55 and y > 0.25 and a probability of 7.8% for the entire Q2 > 5000 GeV2 data sample. The observed excess above Standard Model expectations is particularly interesting because it occurs in a previously unexplored kinematic region.

Original languageEnglish
Pages (from-to)207-220
Number of pages14
JournalZeitschrift fur Physik C-Particles and Fields
Volume74
Issue number2
DOIs
StatePublished - Apr 1997

Funding

FundersFunder number
FNAL
German Federal Ministry for Education and Science, Research and Technology
German Israeli Foundation
Italian National Institute for Nuclear Physics
Korean Ministry of Education and Korea Science and Engineering Foundation
MINERVA Gesellschaft für Forschung GmbH
Netherlands Foundation for Research on Matter
Polish State Committee for Scientific Research2P03B09308 35, 2P03B09208
Tokyo Metropolitan College of Allied Medical Sciences
National Science Foundation
U.S. Department of Energy
Yale University
Foundation for Community Association Research
Fermilab
Midwestern State University
Natural Sciences and Engineering Research Council of Canada
European CommissionERBFMBICT 950172 12
European Commission
Ministry of Education, Culture, Sports, Science and Technology
Stichting voor Fundamenteel Onderzoek der Materie2 P03B 083 08, 115/E-343/SPUB/P03/120/96
Stichting voor Fundamenteel Onderzoek der Materie
German-Israeli Foundation for Scientific Research and DevelopmentI-0444-176.07/95 23
German-Israeli Foundation for Scientific Research and Development
United States-Israel Binational Science Foundation
Bundesministerium für Bildung und Forschung057HH29P, 057HH19P, 057FR19P, 057BN19P
Bundesministerium für Bildung und Forschung
Kyungpook National University
Ministerio de Educación, Cultura y Deporte
Ministry of Education and Science of the Russian Federation
Israel Science Foundation
Instituto Nazionale di Fisica Nucleare
Comisión Interministerial de Ciencia y Tecnología

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