Observation of hard scattering in photoproduction events with a large rapidity gap at HERA
Argonne National Laboratory Argonne, IL, USA4040Supported by the US Department of Energy.; F. Arzarello,; G. Bari,; M. Basile,; L. Bellagamba,; D. Boscherini,; A. Bruni,; G. Bruni,; P. Bruni,; G. Cara Romeo,; M. Chiarini,; F. Cindolo,; F. Ciralli,; A. Contin,; S. D'Auria,; F. Frasconi,; I. Gialas,; P. Giusti,; G. Iacobucci,; G. Laurenti,; G. Levi,; A. Margotti,; T. Massam,; R. Nania,; C. Nemoz,; F. Palmonari,; A. Polini,; G. Sartorelli,; R. Timellini,; A. Zichichi; University and INFN Bologna, Bologna, Italy3030Supported by the Italian National Institute for Nuclear Physics (INFN).; A. Bargende,; J. Crittenden,; K. Desch,; B. Diekmann,; T. Doeker,; M. Eckert,; L. Feld,; A. Frey,; M. Geerts,; M. Grothe,; H. Hartmann,; K. Heinloth,; E. Hilger,; H.-P. Jakob,; U.F. Katz,; S.M. Mari,; A. Mass,; S. Mengel,; J. Mollen,; E. Paul,; Ch. Rembser,; D. Schramm,; J. Stamm,; R. Wedemeyer; Physikalisches Institut der Universität Bonn, Bonn, Germany2727Supported by the German Federal Ministry for Research and Technology (BMFT).; S. Campbell-Robson,; A. Cassidy,; N. Dyce,; B. Foster,; S. George,; R. Gilmore,; G.P. Heath,; H.F. Heath,; T.J. Llewellyn,; C.J.S. Morgado,; D.J.P. Norman,; J.A. O'Mara,; R.J. Tapper,; S.S. Wilson,; R. Yoshida; H.H. Wills Physics Laboratory University of Bristol, Bristol, UK3939Supported by the Particle Physics and Astronomy Research Council.; R.R. Rau; Brookhaven National Laboratory Upton, L.I., USA40; M. Arneodo,; L. Iannotti,; M. Schioppa,; G. Susinno; Calabria University, Physics Dept. and INFN, Cosenza, Italy30; A. Bernstein,; A. Caldwell,; J.A. Parsons,; S. Ritz,; F. Sciulli,; P.B. Straub,; L. Wai,; S. Yang,; Q. Zhu; Columbia University, Nevis Labs. Irvington on Hudson, N.Y., USA4141Supported by the US National Science Foundation.; P. Borzemski,; J. Chwastowski,; A. Eskreys,; K. Piotrzkowski,; M. Zachara,; L. Zawiejski; Inst. of Nuclear Physics, Cracow, Poland3434Supported by the Polish State Committee for Scientific Research (grant No. 204209101).; L. Adamczyk,; B. Bednarek,; K. Eskreys,; K. Jeleń,; D. Kisielewska,; T. Kowalski,; E. Rulikowska-Zarȩbska,; L. Suszycki,; J. Zaja̧c; Faculty of Physics and Nuclear Techniques, Academy of Mining and Metallurgy, Cracow, Poland34; A. Kotański,; M. Przybycień; Jagellonian Univ., Dept. of Physics, Cracow, Poland3535Supported by the Polish State Committee for Scientific Research (grant No. PB 861/2/91 and No. 2 2372 9102, grant No. PB 2 2376 9102 and No. PB 2 0092 9101).; L.A.T. Bauerdick,; U. Behrens,; J.K. Bienlein,; C. Coldewey,; G. Drews,; D.J. Gilkinson,; P. Göttlicher,; B. Gutjahr,; T. Haas,; W. Hain,; D. Hasell,; H. Heßling,; H. Hultschig,; Y. Iga,; P. Joos,; M. Kasemann,; R. Klanner,; W. Koch,; U. Kötz,; H. Kowalski,; J. Labs,; A. Ladage,; B. Löhr,; M. Löwe,; D. Lüke,; O. Mańczak,; J.S.T. Ng,; S. Nickel,; D. Notz,; K. Ohrenberg,; M. Roco,; M. Rohde,; U. Schneekloth,; W. Schulz,; F. Selonke,; T. Voß,; D. Westphal,; G. Wolf,; C. Youngman; Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany; H.J. Grabosch,; A. Leich,; A. Meyer,; C. Rethfeldt,; S. Schlenstedt; DESY-Zeuthen, Inst. für Hochenergiephysik, Zeuthen, Germany; G. Barbagli,; P. Pelfer; University and INFN, Florence, Italy30; G. Anzivino,; G. Maccarrone,; S. De Pasquale,; S. Qian,; L. Votano; INFN, Laboratori Nazionali di Frascati, Frascati, Italy30; A. Bamberger,; A. Freidhof,; S. Söldner-Rembold,; J. Schroeder,; G. Theisen,; T. Trefzger; Fakultät für Physik der Universität Freiburg i.Br., Freiburg i.Br., Germany27; N.H. Brook,; P.J. Bussey,; A.T. Doyle,; I. Fleck,; V.A. Jamieson,; D.H. Saxon,; M.L. Utley,; A.S. Wilson; Dept. of Physics and Astronomy, University of Glasgow, Glasgow, UK39; A. Dannemann,; U. Holm,; D. Horstmann,; T. Neumann,; R. Sinkus,; K. Wick; Hamburg University, I. Institute of Exp. Physics, Hamburg, Germany27; E. Badura,; B.D. Burow,; L. Hagge,; E. Lohrmann,; J. Mainusch,; J. Milewski,; N. Pavel,; G. Poelz,; W. Schott,; F. Zetsche; Hamburg University, II. Institute of Exp. Physics, Hamburg, Germany27; T.C. Bacon,; R. Beuselinck,; I. Butterworth,; E. Gallo,; V.L. Harris,; B.H. Hung,; K.R. Long,; D.B. Miller,; P.P.O. Morawitz,; A. Prinias,; J.K. Sedgbeer,; A.F. Whitfield; Imperial College London, High Energy Nuclear Physics Group, London, UK39; U. Mallik,; E. McCliment,; M.Z. Wang,; S.M. Wang,; J.T. Wu,; Y. Zhang; University of Iowa Physics and Astronomy Dept., Iowa City, USA40; P. Cloth,; D. Filges; Forschungszentrum Jülich, Institut für Kernphysik, Jülich, Germany; S.H. An,; S.M. Hong,; S.W. Nam,; S.K. Park,; M.H. Suh,; S.H. Yon; Korea University, Seoul, South Korea3232Supported by the Korean Ministry of Education and Korea Science and Engineering Foundation.; R. Imlay,; S. Kartik,; H.-J. Kim,; R.R. McNeil,; W. Metcalf,; V.K. Nadendla; Louisiana State University, Dept. of Physics and Astronomy Baton Rouge, LA, USA40; G. Cases,; R. Graciani,; J.M. Hernández,; J. del Peso,; J. Puga,; J.F. de Trocóniz; Univer. Autónoma Madrid, Depto de Física Teóríca, Madrid, Spain3838Supported by the Spanish Ministry of Education and Science through funds provided by CICYT.; G.R. Smith; University of Manitoba, Dept. of Physics, Winnipeg, Manitoba, Canada2525Supported by the Natural Sciences and Engineering Research Council of Canada.; F. Corriveau,; D.S. Hanna,; J. Hartmann,; L.W. Hung,; J.N. Lim,; C.G. Matthews,; P.M. Patel,; L.E. Sinclair,; D.G. Stairs,; M.St. Laurent,; R. Ullmann,; G. Zacek; McGill University, Dept. of Physics, Montreal, Quebec, Canada252626Supported by the FCAR of Quebec, Canada.; V. Bashkirov,; B.A. Dolgoshein,; A. Stifutkin; Moscow Engineering Physics Institute, Moscow, Russia3636Partially supported by the German Federal Ministry for Research and Technology (BMFT).; G.L. Bashindzhagyan,; P.F. Ermolov,; L.K. Gladilin,; Y.A. Golubkov,; V.D. Kobrin,; V.A. Kuzmin,; A.S. Proskuryakov,; A.A. Savin,; L.M. Shcheglova,; A.N. Solomin,; N.P. Zotov; Moscow State University, Institute of Nuclear Physics, Moscow, Russia3737Supported by the German Federal Ministry for Research and Technology (BMFT), the Volkswagen Foundation, and the Deutsche Forschungsgemeinschaft.; S. Bentvelsen,; M. Botje,; F. Chlebana,; A. Dake,; J. Engelen,; M. de Kamps,; P. Kooijman,; A. Kruse,; A. Tenner,; H. Tiecke,; W. Verkerke,; M. Vreeswijk,; L. Wiggers,; E. de Wolf,; R. van Woudenberg; NIKHEF and University of Amsterdam, Netherlands3333Supported by the Netherlands Foundation for Research on Matter (FOM).; D. Acosta,; B. Bylsma,; L.S. Durkin,; K. Honscheid,; C. Li,; T.Y. Ling,; K.W. McLean,; W.N. Murray,; I.H. Park,; R. Seidlein; Ohio State University, Physics Department Columbus, Ohio, USA40; D.S. Bailey,; A. Byrne,; R.J. Cashmore,; A.M. Cooper-Sarkar,; R.C.E. Devenish,; N. Harnew,; M. Lancaster,; L. Lindemann,; J. McFall,; C. Nath,; A. Quadt,; H. Uijterwaal,; R. Walczak,; F.F. Wilson,; T. Yip; Department of Physics, University of Oxford, Oxford, UK39; G. Abbiendi,; A. Bertolin,; R. Brugnera,; R. Carlin,; F. Dal Corso,; M. De Giorgi,; U. Dosselli,; S. Limentani,; M. Morandin,; M. Posocco,; L. Stanco,; R. Stroili,; C. Voci; Dipartimento di Fisica dell' Universita and INFN, Padova, Italy30; J. Bulmahn,; J.M. Butterworth,; R.G. Feild,; B.Y. Oh,; Pennsylvania State University, Dept. of Physics University Park, PA, USA41; G. D'Agostini,; M. Iori,; G. Marini,; M. Mattioli,; A. Nigro,; E. Tassi; Dipartimento di Fisica, Univ. ‘La Sapienza’ and INFN, Rome, Italy30; J.C. Hart,; N.A. McCubbin,; K. Prytz,; T.P. Shah,; T.L. Short; Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, UK39; E. Barberis,; N. Cartiglia,; T. Dubbs,; C. Heusch,; M. Van Hook,; B. Hubbard,; W. Lockman,; J.T. Rahn,; H.F.-W. Sadrozinski,; A. Seiden; University of California Santa Cruz, CA, USA40; J. Biltzinger,; R.J. Seifert,; A.H. Walenta,; G. Zech; Fachbereich Physik der Universität-Gesamthochschule Siegen, Germany27; H. Abramowicz,; G. Briskin,; School of Physics,Tel-Aviv University, Tel Aviv, Israel2929Supported by the German Israeli Foundation, and by the Israel Academy of Science.; T. Hasegawa,; M. Hazumi,; T. Ishii,; M. Kuze,; S. Mine,; Y. Nagasawa,; T. Nagira,; M. Nakao,; I. Suzuki,; K. Tokushuku,; S. Yamada,; Y. Yamazaki; Institute for Nuclear Study, University of Tokyo, Tokyo, Japan3131Supported by the Japanese Ministry of Education, Science and Culture (the Monbusho) and its grants for Scientific Research.; M. Chiba,; R. Hamatsu,; T. Hirose,; K. Homma,; S. Kitamura,; S. Nagayama,; Y. Nakamitsu; Tokyo Metropolitan University, Dept. of Physics, Tokyo, Japan31; R. Cirio,; M. Costa,; M.I. Ferrero,; L. Lamberti,; S. Maselli,; C. Peroni,; R. Sacchi,; A. Solano,; A. Staiano; Universita di Torino, Dipartimento di Fisica Sperimentale and INFN, Torino, Italy30; M. Dardo; II Faculty of Sciences, Torino University and INFN - Alessandria, Italy30; D.C. Bailey,; D. Bandyopadhyay,; F. Benard,; M. Brkic,; M.B. Crombie,; G.F. Hartner,; K.K. Joo,; G.M. Levman,; J.F. Martin,; R.S. Orr,; C.R. Sampson,; R.J. Teuscher; University of Toronto, Dept. of Physics, Toronto, Ont., Canada25; C.D. Catterall,; T.W. Jones,; P.B. Kaziewicz,; J.B. Lane,; R.L. Saunders,; J. Shulman; University College London, Physics and Astronomy Dept., London, UK39; K. Blankenship,; J. Kochocki,; B. Lu,; L.W. Mo; Virginia Polytechnic Inst. and State University, Physics Dept. Blacksburg, VA, USA41; W. Bogusz,; K. Charchuła,; J. Ciborowski,; J. Gajewski,; G. Grzelak,; M. Kasprzak,; M. Krzyżanowski,; K. Muchorowski,; R.J. Nowak,; J.M. Pawlak,; T. Tymieniecka,; A.K. Wróblewski,; J.A. Zakrzewski,; A.F. Żarnecki; Warsaw University, Institute of Experimental Physics, Warsaw, Poland34; M. Adamus; Institute for Nuclear Studies, Warsaw, Poland34; C. Glasman,; A. Shapira; Weizmann Institute, Nuclear Physics Dept., Rehovot, Israel2828Supported by the MINERVA Gesellschaft für Forschung GmbH, and by the Israel Academy of Science.; I. Ali,; B. Behrens,; S. Dasu,; C. Fordham,; C. Foudas,; A. Goussiou,; R.J. Loveless,; D.D. Reeder,; S. Silverstein,; W.H. Smith; University of Wisconsin, Dept. of Physics Madison, WI, USA40; T. Tsurugai; Meiji Gakuin University, Faculty of General Education, Yokohama, Japan; W.R. Frisken,; K.M. Furutani; York University, Dept. of Physics, North York, Ont., Canada25
Physics Letters B 01/1995; DOI: 10.1016/0370-2693(95)00022-D