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Observation of isolated high-ET photons in deep inelastic scattering

  • S. Chekanov*
  • , M. Derrick
  • , J. H. Loizides
  • , S. Magill
  • , S. Miglioranzi
  • , B. Musgrave
  • , J. Repond
  • , R. Yoshida
  • , M. C.K. Mattingly
  • , N. Pavel
  • , 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, A. Montanari, R. Nania, F. Palmonari, A. Pesci, L. Rinaldi, G. Sartorelli, A. Zichichi, G. Aghuzumtsyan, D. Bartsch, I. Brock, S. Goers, H. Hartmann, E. Hilger, P. Irrgang, H. P. Jakob, O. Kind, U. Meyer, E. Paul, J. Rautenberg, R. Renner, A. Stifutkin, J. Tandler, K. C. Voss, M. Wang, D. S. Bailey, N. H. Brook, J. E. Cole, G. P. Heath, T. Namsoo, S. Robins, M. Wing, M. Capua, A. Mastroberardino, M. Schioppa, G. Susinno, J. Y. Kim, I. T. Lim, K. J. Ma, M. Y. Pac, M. Helbich, Y. Ning, Z. Ren, W. B. Schmidke, F. Sciulli, J. Chwastowski, A. Eskreys, J. Figiel, A. Galas, K. Olkiewicz, P. Stopa, L. Zawiejski, L. Adamczyk, T. Bold, I. Grabowska-Bold, D. Kisielewska, A. M. Kowal, M. Kowal, J. Lukasik, M. Przybycien, L. Suszycki, D. Szuba, J. Szuba, A. Kotanski, W. Slominski, V. Adler, U. Behrens, I. Bloch, K. Borras, V. Chiochia, D. Dannheim, G. Drews, J. Fourletova, U. Fricke, A. Geiser, P. Göttlicher, O. Gutsche, T. Haas, W. Hain, S. Hillert, C. Horn, B. Kahle, U. Kötz, H. Kowalski, G. Kramberger, H. Labes, D. Lelas, H. Lim, B. Löhr, R. Mankel, I. A. Melzer-Pellmann, C. N. Nguyen, D. Notz, A. E. Nuncio-Quiroz, A. Polini, A. Raval, L. Rurua, U. Schneekloth, U. Stösslein, G. Wolf, C. Youngman, W. Zeuner, S. Schlenstedt, G. Barbagli, E. Gallo, C. Genta, P. G. Pelfer, A. Bamberger, A. Benen, F. Karstens, D. Dobur, N. N. Vlasov, M. Bell, P. J. Bussey, A. T. Doyle, J. Ferrando, J. Hamilton, S. Hanlon, D. H. Saxon, I. O. Skillicorn, I. Gialas, T. Carli, T. Gosau, U. Holm, N. Krumnack, E. Lohrmann, M. Milite, H. Salehi, P. Schleper, T. Schörner-Sadenius, S. Stonjek, K. Wichmann, K. Wick, A. Ziegler, A. Ziegler, C. Collins-Tooth, C. Foudas, R. Gonçalo, K. R. Long, A. D. Tapper, P. Cloth, D. Filges, M. Kataoka, K. Nagano, K. Tokushuku, S. Yamada, Y. Yamazaki, A. N. Barakbaev, E. G. Boos, N. S. Pokrovskiy, B. O. Zhautykov, D. Son, K. Piotrzkowski, F. Barreiro, C. Glasman, O. González, L. Labarga, J. del Peso, E. Tassi, J. Terrón, M. Zambrana, M. Barbi, F. Corriveau, S. Gliga, J. Lainesse, S. Padhi, D. G. Stairs, R. Walsh, T. Tsurugai, A. Antonov, P. Danilov, B. A. Dolgoshein, D. Gladkov, V. Sosnovtsev, S. Suchkov, R. K. Dementiev, P. F. Ermolov, I. I. Katkov, L. A. Khein, I. A. Korzhavina, V. A. Kuzmin, B. B. Levchenko, O. Y. Lukina, A. S. Proskuryakov, L. M. Shcheglova, S. A. Zotkin, I. Abt, C. Büttner, A. Caldwell, X. Liu, J. Sutiak, N. Coppola, S. Grijpink, E. Koffeman, P. Kooijman, E. Maddox, A. Pellegrino, S. Schagen, H. Tiecke, M. Vázques, L. Wiggers, E. de Wolf, N. Brümmer, B. Bylsma, L. S. Durkin, T. Y. Ling, A. M. Cooper-Sarkar, A. Cottrell, R. C.E. Devenish, B. Foster, G. Grzelak, C. Gwenlan, T. Kohno, S. Patel, P. B. Straub, R. Walczak, A. Bertolin, 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, F. Metlica, B. Y. Oh, 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, H. Abramowicz, A. Gabareen, S. Kananov, A. Kreisel, A. Levy, M. Kuze, T. Fusayasu, S. Kagawa, T. Tawara, T. Yamashita, R. Hamatsu, T. Hirose, M. Inuzuka, H. Kaji, S. Kitamura, K. Matsuzawa, M. Costa, M. I. Ferrero, V. Monaco, R. Sacchi, A. Solano, M. Arneodo, M. Ruspa, T. Koop, J. F. Martin, A. Mirea, J. M. Butterworth, R. Hall-Wilton, T. W. Jones, M. S. Lightwood, M. R. Sutton, C. Targett-Adams, J. Ciborowski, R. Ciesielski, P. Luzniak, R. J. Nowak, J. M. Pawlak, J. Sztuk, T. Tymieniecka, A. Ukleja, J. Ukleja, A. F. Zarnecki, M. Adamus, P. Plucinski, Y. Eisenberg, D. Hochman, U. Karshon, M. Riveline, A. Everett, L. K. Gladilin, D. Kçira, S. Lammers, L. Li, D. D. Reeder, M. Rosin, P. Ryan, A. A. Savin, W. H. Smith, S. Dhawan, S. Bhadra, C. D. Catterall, S. Fourletov, G. Hartner, S. Menary, M. Soares, J. Standage
*Corresponding author for this work
  • Argonne National Laboratory
  • University College London
  • Andrews University
  • Humboldt University of Berlin
  • National Institute for Nuclear Physics
  • University of Bonn
  • University of Bristol
  • Chonnam National University
  • Dongshin University
  • Columbia University
  • Institute of Nuclear Physics Polish Academy of Sciences
  • AGH University of Krakow
  • Jagiellonian University in Kraków
  • German Electron Synchrotron
  • University of Oxford
  • University of Freiburg
  • University of Glasgow
  • University of the Aegean
  • University of Hamburg
  • Imperial College London
  • Royal Holloway University of London
  • Jülich Research Centre
  • High Energy Accelerator Research Organization, Institute of Particle and Nuclear Physics
  • Nara Women's University
  • The University of Tokyo
  • Ministry of Education and Science of the Republic of Kazakhstan
  • Kyungpook National University
  • Université catholique de Louvain
  • Universidad Autónoma de Madrid
  • McGill University
  • Meiji Gakuin University
  • Moscow Engineering Physics Institute
  • Lomonosov Moscow State University
  • Max Planck Institute for Physics (Werner Heisenberg Institute)
  • University of Amsterdam
  • Ohio State University
  • Pennsylvania State University
  • Polytechnic University Japan
  • University of Rome La Sapienza
  • Rutherford Appleton Laboratory
  • Queen Mary University of London
  • University of California at Santa Cruz
  • Ewha Womans University
  • Tel Aviv University
  • Institute of Science Tokyo
  • Tokyo Metropolitan University
  • University of Turin
  • University of Eastern Piedmont
  • University of Toronto
  • University of Warsaw
  • University of Lodz
  • 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

First measurements of cross sections for isolated prompt photon production in deep inelastic ep scattering have been made using the ZEUS detector at the HERA electron-proton collider using an integrated luminosity of 121 pb -1. A signal for isolated photons in the transverse energy and rapidity ranges 5<ETγ<10GeV and -0.7<ηγ<0.9 was observed for virtualities of the exchanged photon of Q2>35GeV2. Cross sections are presented for inclusive prompt photons and for those accompanied by a single jet in the range ETjet≥6GeV and -1. 5≤ηjet<1.8. Calculations at order α 3αs describe the data reasonably well.

Original languageEnglish
Pages (from-to)86-100
Number of pages15
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume595
Issue number1-4
DOIs
StatePublished - 12 Aug 2004

Funding

FundersFunder number
UK Research and Innovation53706

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