Observation of direct processes in photoproduction at HERA

M. Derrick, D. Krakauer, S. Magill, B. Musgrave, J. Repond, S. Repond, R. Stanek, R. L. Talaga, J. Thron, F. Arzarello, R. Ayad, G. Bari, M. Basile, L. Bellagamba, D. Boscherini, A. Bruni, G. Bruni, P. Bruni, G. Cara Romeo, G. CastelliniM. Chiarini, L. Cifarelli, F. Cindolo, F. Ciralli, A. Contin, C. Del Papa, S. D'Auria, F. Frasconi, P. Giusti, G. Iacobucci, G. Laurenti, G. Levi, Q. Lin, G. Maccarrone, A. Margotti, T. Massam, R. Nania, C. Nemoz, F. Palmonari, G. Sartorelli, R. Timellini, Y. Zamora Garcia, A. Zichichi, A. Bargende, J. Crittenden, K. Desch, B. Diekmann, T. Doeker, L. Feld, A. Frey, M. Geerts, G. Geitz, H. Hartmann, D. Haun, K. Heinloth, E. Hilger, H. P. Jakob, U. F. Katz, S. Kramarczyk, M. Kückes, A. Mass, S. Mengel, J. Mollen, H. Müsch, E. Paul, R. Schattevoy, J. L. Schneider, D. Schramm, R. Wedemeyer, A. Cassidy, D. G. Cussans, N. Dyce, B. Foster, S. George, R. Gilmore, G. P. Heath, H. F. Heath, M. Lancaster, T. J. Llewellyn, C. J.S. Morgado, J. A. O'Mara, R. J. Tapper, S. S. Wilson, R. Yoshida, R. R. Rau, M. Arneodo, M. Schioppa, G. Susinno, A. Bernstein, A. Caldwell, I. Gialas, J. A. Parsons, S. Ritz, F. Sciulli, P. B. Straub, L. Wai, S. Yang, P. Borzemski, J. Chwastowski, A. Eskreys, K. Piotrzkowski, M. Zachara, L. Zawiejski, L. Adamczyk, B. Bednarek, K. Eskreys, K. Jeleń, D. Kisielewska, T. Kowalski, E. Rulikowska-Zarȩbska, L. Suszycki, J. Zaja̧c, T. Kȩdzierski, A. Kotański, M. Przybycień, L. A.T. Bauerdick, U. Behrens, J. K. Bienlein, S. Böttcher, C. Coldewey, G. Drews, M. Flasiński, I. Fleck, D. J. Gilkinson, P. Göttlicher, B. Gutjahr, T. Haas, L. Hagge, W. Hain, D. Hasell, H. Heßling, H. Hultschig, P. Joos, M. Kasemann, R. Klanner, W. Koch, L. Köpke, U. Kötz, H. Kowalski, W. Kröger, J. Krüger, J. Labs, A. Ladage, M. Löhr, M. Löwe, D. Lüke, J. Mainusch, O. Mańczak, M. Momayezi, J. S.T. Ng, S. Nickel, D. Notz, K. U. Pösnecker, M. Rohde, J. Roldán, U. Schneekloth, J. Schroeder, W. Schulz, F. Selonke, E. Stiliaris, T. Tsurugai, W. Vogel, D. Westphal, G. Wolf, C. Youngman, H. J. Grabosch, A. Leich, A. Meyer, C. Rethfeldt, S. Schlenstedt, G. Barbagli, M. Nuti, P. Pelfer, G. Anzivino, S. De Pasquale, S. Qian, L. Votano, A. Bamberger, A. Freidhof, T. Poser, S. Söldner-Rembold, G. Theisen, T. Trefzger, N. H. Brook, P. J. Bussey, A. T. Doyle, J. R. Forbes, V. A. Jamieson, C. Raine, D. H. Saxon, M. Stavrianakou, A. S. Wilson, H. Brückmann, A. Dannemann, U. Holm, D. Horstmann, H. Kammerlocher, B. Krebs, T. Neumann, R. Sinkus, K. Wick, A. Fürtjes, E. Lohrmann, J. Milewski, M. Nakahata, N. Pavel, G. Poelz, W. Schott, J. Terron, F. Zetsche, T. C. Bacon, R. Beuselinck, I. Butterworth, E. Gallo, V. L. Harris, K. R. Long, D. B. Miller, A. Prinias, J. K. Sedgbeer, A. Vorvolakos, A. Whitfield, T. Bienz, H. Kreutzmann, U. Mallik, E. McCliment, M. Roco, M. Z. Wang, P. Cloth, D. Filges, S. H. An, S. M. Hong, C. O. Kim, T. Y. Kim, S. W. Nam, S. K. Park, M. H. Suh, S. H. Yon, R. Imlay, S. Kartik, H. J. Kim, R. R. McNeil, W. Metcalf, V. K. Nadendla, F. Barreiro, G. Cases, L. Hervás, L. Labarga, J. del Peso, J. F. de Trocóniz, F. Ikraiam, J. K. Mayer, G. R. Smith, F. Corriveau, D. S. Hanna, J. Hartmann, L. W. Hung, J. N. Lim, C. G. Matthews, J. W. Mitchell, P. M. Patel, L. E. Sinclair, D. G. Stairs, M. St Laurent, R. Ullmann, G. L. Bashindzhagyan, P. F. Ermolov, L. K. Gladilin, Y. A. Golubkov, V. A. Kuzmin, E. N. Kuznetsov, A. A. Savin, A. G. Voronin, N. P. Zotov, S. Bentvelsen, M. Botje, A. Dake, J. Engelen, P. de Jong, M. de Kamps, P. Kooijman, A. Kruse, H. van der Lugt, V. O'Dell, A. Tenner, H. Tiecke, H. Uijterwaal, M. Vreeswijk, L. Wiggers, E. de Wolf, R. van Woudenberg, B. Bylsma, L. S. Durkin, K. Honscheid, C. Li, T. Y. Ling, K. W. McLean, W. N. Murray, I. H. Park, T. A. Romanowski, R. Seidlein, D. Bailey, G. A. Blair, A. Byrne, R. J. Cashmore, A. M. Cooper-Sarkar, R. C.E. Devenish, N. Harnew, T. Khatri, P. Luffman, P. Morawitz, J. Nash, N. C. Roocroft, R. Walczak, F. F. Wilson, T. Yip, G. Abbiendi, A. Bertolin, R. Brugnera, R. Carlin, F. Dal Corso, M. De Giorgi, U. Dosselli, F. Gasparini, S. Limentani, M. Morandin, M. Posocco, L. Stanco, R. Stroili, C. Voci, J. Bulmahn, J. M. Butterworth, R. G. Feild, B. Y. Oh, J. J. Whitmore, U. Contino, G. D'Agostini, M. Guida, M. Iori, S. M. Mari, G. Marini, M. Mattioli, A. Nigro, J. C. Hart, N. A. McCubbin, K. Prytz, T. P. Shah, T. L. Short, E. Barberis, N. Cartiglia, C. Heusch, M. Van Hook, B. Hubbard, W. Lockman, H. F.W. Sadrozinski, A. Seiden, D. Zer-Zion, E. Badura, J. Biltzinger, R. J. Seifert, A. H. Walenta, G. Zech, S. Dagan, A. Levy, T. Hasegawa, M. Hazumi, T. Ishii, S. Kasai, M. Kuze, S. Mine, Y. Nagasawa, T. Nagira, M. Nakao, H. Okuno, I. Suzuki, K. Tokushuku, S. Yamada, Y. Yamazaki, M. Chiba, R. Hamatsu, T. Hirose, K. Homma, S. Kitamura, S. Nagayama, Y. Nakamitsu, R. Cirio, M. Costa, M. I. Ferrero, L. Lamberti, S. Maselli, C. Peroni, A. Solano, R. Sacchi, A. Staiano, M. Dardo, D. C. Bailey, D. Bandyopadhyay, F. Benard, S. Bhadra, M. Brkic, B. D. Burow, F. S. Chlebana, M. B. Crombie, D. M. Gingrich, G. F. Hartner, G. M. Levman, J. F. Martin, R. S. Orr, C. R. Sampson, R. J. Teuscher, F. W. Bullock, C. D. Catterall, J. C. Giddings, T. W. Jones, A. M. Khan, J. B. Lane, P. L. Makkar, D. Shaw, J. Shulman, K. Blankenship, J. Kochocki, B. Lu, L. W. Mo, K. Charchuła, J. Ciborowski, J. Gajewski, G. Grzelak, M. Kasprzak, M. Krzyzanowski, K. Muchorowski, R. J. Nowak, J. M. Pawlak, T. Tymieniecka, A. K. Wróblewski, J. A. Zakrzewski, A. F. Zarnecki, M. Adamus, H. Abramowicz, Y. Eisenberg, C. Glasman, U. Karshon, A. Montag, D. Revel, A. Shapira, C. Foudas, C. Fordham, R. J. Loveless, A. Goussiou, I. Ali, B. Behrens, S. Dasu, D. D. Reeder, W. H. Smith, S. Silverstein, W. R. Frisken, K. M. Furutani, Y. Iga

Research output: Contribution to journalArticlepeer-review

81 Citations (Scopus)

Abstract

Jets in photoproduction events have been studied with the ZEUS detector for γp centre-of-mass energies ranging from 130 to 250 GeV. The inclusive jet distributions give evidence for the dominance of resolved photon interactions. In the di-jet sample the direct processes are for the first time clearly isolated. Di-jet cross sections for the resolved and direct processes are given in a restricted kinematic range.

Original languageEnglish
Pages (from-to)287-300
Number of pages14
JournalPhysics Letters B
Volume322
Issue number3
DOIs
Publication statusPublished - 1994 Feb 17

Bibliographical note

Funding Information:
44 Supported by the Italian National Institute for Nuclear Physics (INFN).

Funding Information:
10 Supported by the European Community.

Funding Information:
46 Supported by the Korean Ministry of Education and

Funding Information:
GmbH, by the Israel Ministry of Energy, and by the Israel Academy of Science.

Funding Information:
43 Supported by the Israel Ministry of Energy, and by the

Funding Information:
41 Supported by the German Federal Ministry for Research

Funding Information:
5o Supported by the German Federal Ministry for Research

Funding Information:
48 Supported by the Polish State Committee for Scientific

Funding Information:
tific Research (grant No. PB 861/2/91 and No. 2 2372

Funding Information:
22 NOW at Univ. of California, Davis, CA. 23 Now at Fermilab., Batavia, IL. 24 Now at SSC, Dallas. 25 Now at Department of Energy, Washington. 26 Now at RHBNC, Univ. of London, England. 27 Now with A.T. Kearney Ltd., London, England. 2s Now with Tessella Support Services, Abingdon, England. 29 Now with Arthur Andersen Consultants, London, England. 3o Now at Hamburg Univ., II. Inst. for Experimental Physics. 31 On leave and supported by DESY 1992-93. 32 On leave and supported by DESY 1993-94. 33 Permanent address: Dip. di Fisica, Univ. di Salerno, Italy. 34 Supported by the MINERVA Gesellschaft fiir Forschung GmbH. 3s Now at Hiroshima National College of Maritime Technology. 36 Now at NIKHEF, Amsterdam. 37 Now at Centre for Subatomic Research, Univ. of Alberta, Canada and TRIUMF, Vancouver, Canada. 3s On leaye from Warsaw Univ.

Funding Information:
39 Supported by the Natural Sciences and Engineering Re-search Council of Canada.

Funding Information:
49 Supported by the Polish State Committee for Scien-

Funding Information:
4o Supported by the FCAR of Quebec, Canada.

Funding Information:
45 Supported by the Japanese Ministry of Education, Sci-

Funding Information:
1 Supported by Worldlab, Lausanne, Switzerland.

Funding Information:
21 Supported by Fundaci6n Banco Exterior.

Funding Information:
51 Supported by the Spanish Ministry of Education and

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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