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Scaling violations and determination of αs from jet production in γp interactions at HERA

  • S. Chekanov
  • , D. Krakauer
  • , J. H. Loizides
  • , S. Magill
  • , B. Musgrave
  • , J. Repond
  • , R. Yoshida
  • , M. C.K. Mattingly
  • , P. Antonioli
  • , G. Bari
  • , M. Basile
  • , L. Bellagamba
  • , D. Boscherini
  • , A. Bruni
  • , G. Bruni
  • , G. Cara Romeo
  • , L. Cifarelli
  • , F. Cindolo
  • , A. Contin
  • , M. Corradi
  • S. de Pasquale, P. Giusti, G. Iacobucci, A. Margotti, R. Nania, F. Palmonari, A. Pesci, G. Sartorelli, A. Zichichi, G. Aghuzumtsyan, D. Bartsch, I. Brock, S. Goers, H. Hartmann, E. Hilger, P. Irrgang, H. P. Jakob, A. Kappes, U. F. Katz, O. Kind, E. Paul, J. Rautenberg, R. Renner, H. Schnurbusch, A. Stifutkin, J. Tandler, K. C. Voss, M. Wang, A. Weber, D. S. Bailey, N. H. Brook, J. E. Cole, B. Foster, G. P. Heath, H. F. Heath, S. Robins, E. Rodrigues, J. Scott, R. J. Tapper, M. Wing, M. Capua, A. Mastroberardino, M. Schioppa, G. Susinno, J. Y. Kim, Y. K. Kim, J. H. Lee, I. T. Lim, M. Y. Pac, A. Caldwell, M. Helbich, X. Liu, B. Mellado, Y. Ning, S. Paganis, Z. Ren, W. B. Schmidke, F. Sciulli, J. Chwastowski, A. Eskreys, J. Figiel, K. Olkiewicz, P. Stopa, L. Zawiejski, L. Adamczyk, T. Bold, I. Grabowska-Bold, D. Kisielewska, A. M. Kowal, M. Kowal, T. Kowalski, M. Przybycien, L. Suszycki, D. Szuba, J. Szuba, A. Kotanski, W. Slominski, L. A.T. Bauerdick, U. Behrens, I. Bloch, K. Borras, V. Chiochia, D. Dannheim, M. Derrick, G. Drews, J. Fourletova, A. Fox-Murphy, U. Fricke, A. Geiser, F. Goebel, P. Göttlicher, O. Gutsche, T. Haas, W. Hain, G. F. Hartner, S. Hillert, U. Kötz, H. Kowalski, G. Kramberger, H. Labes, D. Lelas, B. Löhr, R. Mankel, I. A. Melzer-Pellmann, M. Moritz, D. Notz, M. C. Petrucci, A. Polini, A. Raval, U. Schneekloth, F. Selonke, H. Wessoleck, R. Wichmann, G. Wolf, C. Youngman, W. Zeuner, A. Lopez-Duran Viani, A. Meyer, S. Schlenstedt, G. Barbagli, E. Gallo, C. Genta, P. G. Pelfer, A. Bamberger, A. Benen, N. Coppola, M. Bell, P. J. Bussey, A. T. Doyle, C. Glasman, J. Hamilton, S. Hanlon, S. W. Lee, A. Lupi, D. H. Saxon, I. O. Skillicorn, I. Gialas, B. Bodmann, T. Carli, U. Holm, K. Klimek, N. Krumnack, E. Lohrmann, M. Milite, H. Salehi, S. Stonjek, K. Wick, A. Ziegler, A. Ziegler, C. Collins-Tooth, C. Foudas, R. Gonçalo, K. R. Long, F. Metlica, A. D. Tapper, P. Cloth, D. Filges, M. Kuze, K. Nagano, K. Tokushuku, S. Yamada, Y. Yamazaki, A. N. Barakbaev, E. G. Boos, N. S. Pokrovskiy, B. O. Zhautykov, H. Lim, D. Son, F. Barreiro, O. González, L. Labarga, J. del Peso, I. Redondo, E. Tassi, J. Terrón, M. Vázquez, M. Barbi, A. Bertolin, F. Corriveau, S. Gliga, J. Lainesse, S. Padhi, D. G. Stairs, T. Tsurugai, A. Antonov, P. Danilov, B. A. Dolgoshein, D. Gladkov, V. Sosnovtsev, S. Suchkov, R. K. Dementiev, P. F. Ermolov, Y. A. Golubkov, I. I. Katkov, L. A. Khein, I. A. Korzhavina, V. A. Kuzmin, B. B. Levchenko, O. Y. Lukina, A. S. Proskuryakov, L. M. Shcheglova, N. N. Vlasov, S. A. Zotkin, C. Bokel, J. Engelen, S. Grijpink, E. Koffeman, P. Kooijman, E. Maddox, A. Pellegrino, S. Schagen, H. Tiecke, N. Tuning, J. J. Velthuis, L. Wiggers, E. de Wolf, N. Brümmer, B. Bylsma, L. S. Durkin, T. Y. Ling, S. Boogert, A. M. Cooper-Sarkar, R. C.E. Devenish, J. Ferrando, G. Grzelak, T. Matsushita, M. Rigby, O. Ruske, M. R. Sutton, R. Walczak, R. Brugnera, R. Carlin, F. Dal Corso, S. Dusini, A. Garfagnini, S. Limentani, A. Longhin, A. Parenti, M. Posocco, L. Stanco, M. Turcato, E. A. Heaphy, B. Y. Oh, P. R.B. Saull, J. J. Whitmore, Y. Iga, G. D'Agostini, G. Marini, A. Nigro, C. Cormack, J. C. Hart, N. A. McCubbin, C. Heusch, I. H. Park, N. Pavel, H. Abramowicz, A. Gabareen, S. Kananov, A. Kreisel, A. Levy, T. Abe, T. Fusayasu, S. Kagawa, T. Kohno, T. Tawara, T. Yamashita, R. Hamatsu, T. Hirose, M. Inuzuka, S. Kitamura, K. Matsuzawa, T. Nishimura, M. Arneodo, M. I. Ferrero, V. Monaco, M. Ruspa, R. Sacchi, A. Solano, R. Galea, T. Koop, G. M. Levman, J. F. Martin, A. Mirea, A. Sabetfakhri, J. M. Butterworth, C. Gwenlan, R. Hall-Wilton, T. W. Jones, M. S. Lightwood, B. J. West, J. Ciborowski, R. Ciesielski, R. J. Nowak, J. M. Pawlak, B. Smalska, J. Sztuk, T. Tymieniecka, A. Ukleja, J. Ukleja, A. F. Zarnecki, M. Adamus, P. Plucinski, Y. Eisenberg, L. K. Gladilin, D. Hochman, U. Karshon, D. Kçira, S. Lammers, L. Li, D. D. Reeder, A. A. Savin, W. H. Smith, A. Deshpande, S. Dhawan, V. W. Hughes, P. B. Straub, S. Bhadra, C. D. Catterall, S. Fourletov, S. Menary, M. Soares, J. Standage
  • Argonne National Laboratory
  • University College London
  • Andrews University
  • National Institute for Nuclear Physics
  • University of Bonn
  • University of Bristol
  • University of Calabria
  • Chonnam National University
  • Dongshin University
  • Columbia University
  • Max Planck Institute for Physics (Werner Heisenberg Institute)
  • Institute of Nuclear Physics
  • AGH University of Krakow
  • Jagiellonian University in Kraków
  • German Electron Synchrotron
  • Fermi National Accelerator Laboratory
  • R.E. Austin Ltd.
  • CERN
  • Mobilcom AG
  • DESYZeuthen
  • Deutsche Börse Systems AG
  • University of Freiburg
  • University of Glasgow
  • University of the Aegean
  • University of Hamburg
  • University of Oxford
  • Imperial College London
  • Jülich Research Centre
  • High Energy Accelerator Research Organization, Institute of Particle and Nuclear Physics
  • The University of Tokyo
  • Ministry of Education and Science of the Republic of Kazakhstan
  • Kyungpook National University
  • Universidad Autónoma de Madrid
  • CNRS-IN2P3
  • McGill University
  • Meiji Gakuin University
  • Moscow Engineering Physics Institute
  • Lomonosov Moscow State University
  • University of Amsterdam
  • Ohio State University
  • IBM
  • Pennsylvania State University
  • National Research Council of Canada
  • Polytechnic University Japan
  • University of Rome La Sapienza
  • STFC Rutherford Appleton Laboratory
  • Queen Mary University of London
  • University of California at Santa Cruz
  • Ewha Womans University
  • University of Siegen
  • Tel Aviv University
  • Tokyo Metropolitan University
  • University of Turin
  • University of Eastern Piedmont
  • University of Toronto
  • University of Warsaw
  • University of Lodz
  • The Boston Consulting Group
  • Institute of Nuclear Chemistry and Technology, Warsaw
  • Weizmann Institute of Science
  • University of Wisconsin-Madison
  • Yale University
  • York University Toronto

Research output: Contribution to journalArticlepeer-review

40 Scopus citations

Abstract

Differential cross sections for jet photoproduction in the reaction ep → e jet X have been measured with the ZEUS detector at HERA using 82.2 pb-1 of integrated luminosity. Inclusive jet cross sections are presented as a function of the jet transverse energy, ETjet, for jets with ETjet > 17 GeV and pseudorapidity -1 <ηjet <2.5, in the γp centre-of-mass-energy range 142 < Wγp < 293 GeV. Scaled jet invariant cross sections are presented as a function of the dimensionless variable xT ≡ 2ETjet/Wγp for (Wγp) = 180 and 255 GeV. Next-to-leading-order QCD calculations give a good description of the measured differential cross sections in both magnitude and shape. The ratio of scaled jet invariant cross sections at the two (Wγp) values shows clear non-scaling behaviour. A value for the strong coupling constant of αs(MZ) = 0.1224 ± 0.0001 (stat.)-0.0019+0.0022(exp.)-0.0042 +0.0054(th.) has been extracted from a QCD analysis of the measured dσ/dETjet. The variation of αs with ETjet is in good agreement with the running of αs as predicted by QCD.

Original languageEnglish
Pages (from-to)7-23
Number of pages17
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume560
Issue number1-2
DOIs
StatePublished - May 8 2003

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