Observation of hard processes in rapidity gap events in γp interactions at HERA

T. Ahmed,S. Aid,V. Andreev,B. Andrieu,R.-D. Appuhn,M. Arpagaus,A. Babaev, J. Baehr, J. Bán,P. Baranov,E. Barrelet,W. Bartel, M. Barth, U. Bassler,H.P. Beck, H.-J. Behrend,A. Belousov,Ch. Berger,H. Bergstein,G. Bernardi,R. Bernet,G. Bertrand-Coremans,M. Besançon,R. Beyer,P. Biddulph,J.C. Bizot, V. Blobel,K. Borras,F. Botterweck,V. Boudry,A. Braemer,F. Brasse,W. Braunschweig,V. Brisson,D. Bruncko,C. Brune,R. Buchholz,L. Büngener,J. Bürger,F.W. Büsser,A. Buniatian,S. Burke,G. Buschhorn,A.J. Campbell, T. Carli,F. Charles,D. Clarke,A.B. Clegg,B. Clerbaux,M. Colombo,J.G. Contreras,J.A. Coughlan, A. Courau,Ch. Coutures,G. Cozzika,L. Criegee,D.G. Cussans,J. Cvach,S. Dagoret, J.B. Dainton,M. Danilov,W.D. Dau,K. Daum,M. David,E. Deffur,B. Delcourt,L. Del Buono,A. De Roeck,E.A. De Wolf,P. Di Nezza,C. Dollfus,J.D. Dowell,H.B. Dreis,V. Droutskoi,J. Duboc,D. Düllmann,O. Dünger,H. Duhm,J. Ebert,T.R. Ebert, G. Eckerlin,V. Efremenko,S. Egli,H. Ehrlichmann,S. Eichenberger,R. Eichler, F. Eisele, E. Eisenhandler,R.J. Ellison,E. Elsen,M. Erdmann, W. Erdmann,E. Evrard,L. Favart,A. Fedotov,D. Feeken,R. Felst,J. Feltesse, J. Ferencei,F. Ferrarotto,K. Flamm,M. Fleischer,M. Flieser,G. Flügge,A. Fomenko,B. Fominykh,M. Forbush,J. Formánek,J.M. Foster,G. Franke,E. Fretwurst, E. Gabathuler, K. Gabathuler,K. Gamerdinger, J. Garvey,J. Gayler,M. Gebauer,A. Gellrich,H. Genzel,R. Gerhards, U. Goerlach,L. Goerlach,N. Gogitidze,M. Goldberg,D. Goldner, B. Gonzalez-Pineiro,A.M. Goodall,I. Gorelov,P. Goritchev, C. Grab,H. Grässler,R. Grässler, T. Greenshaw,G. Grindhammer, A. Gruber,C. Gruber,J. Haack,D. Haidt,L. Hajduk,O. Hamon,M. Hampel,E.M. Hanlon,M. Hapke,W.J. Haynes,J. Heatherington, G. Heinzelmann, R.C.W. Henderson,H. Henschel,R. Herma,I. Herynek,M.F. Hess,W. Hildesheim,P. Hill,K.H. Hiller,C.D. Hilton,J. Hladký,K.C. Hoeger,M. Höppner, R. Horisberger,Ph. Huet,H. Hufnagel, M. Ibbotson,H. Itterbeck,M.-A. Jabiol, A. Jacholkowska,C. Jacobsson,M. Jaffre,J. Janoth,T. Jansen,L. Jönsson,K. Johannsen,D.P. Johnson,L. Johnson, H. Jung,P.I.P. Kalmus,D. Kant,R. Kaschowitz,P. Kasselmann,U. Kathage,H.H. Kaufmann,S. Kazarian,I.R. Kenyon,S. Kermiche,C. Keuker,C. Kiesling,M. Klein, C. Kleinwort,G. Knies,W. Ko,T. Köhler, H. Kolanoski,F. Kole,S.D. Kolya,V. Korbel,M. Korn,P. Kostka,S.K. Kotelnikov,T. Krämerkämper, M.W. Krasny,H. Krehbiel,D. Krücker,U. Krüger,U. Krüner-Marquis,J.P. Kubenka,H. Küster,M. Kuhlen,T. Kurča,J. Kurzhöfer,B. Kuznik, D. Lacour,F. Lamarche,R. Lander,M.P.J. Landon,W. Lange,P. Lanius,J.-F. Laporte, A. Lebedev,C. Leverenz,S. Levonian,Ch. Ley,A. Lindner,G. Lindström,F. Linsel,J. Lipinski,B. List, P. Loch,H. Lohmander,G.C. Lopez,V. Lubimov,D. Lüke,N. Magnussen,E. Malinovski,S. Mani,R. Maraček, P. Marage,J. Marks, R. Marshall,J. Martens,R. Martin,H.-U. Martyn,J. Martyniak,S. Masson,T. Mavroidis,S.J. Maxfield,S.J. McMahon,A. Mehta,K. Meier,D. Mercer,T. Merz,C.A. Meyer,H. Meyer,J. Meyer,S. Mikocki,D. Milstead,F. Moreau,J.V. Morris,G. Müller,K. Müller,P. Murín,V. Nagovizin,R. Nahnhauer,B. Naroska,Th. Naumann,P.R. Newman,D. Newton,D. Neyret,H.K. Nguyen,F. Niebergall,C. Niebuhr, R. Nisius,G. Nowak,G.W. Noyes,M. Nyberg-Werther, H. Oberlack,U. Obrock,J.E. Olsson,E. Panaro,A. Panitch,C. Pascaud,G.D. Patel,E. Peppel,E. Perez,J.P. Phillips,Ch. Pichler, D. Pitzl,G. Pope,S. Prell,R. Prosi,G. Rädel, F. Raupach,P. Reimer,S. Reinshagen,P. Ribarics,H. Rick,V. Riech,J. Riedlberger,S. Riess,M. Rietz,S.M. Robertson, P. Robmann,H.E. Roloff,R. Roosen,K. Rosenbauer,A. Rostovtsev,F. Rouse, C. Royon,K. Rüter,S. Rusakov,K. Rybicki,R. Rylko,N. Sahlmann,E. Sanchez,D.P.C. Sankey,M. Savitsky, P. Schacht,S. Schiek, P. Schleper,W. von Schlippe,C. Schmidt,D. Schmidt,G. Schmidt,A. Schöning,V. Schröder,E. Schuhmann,B. Schwab,A. Schwind,U. Seehausen,F. Sefkow,M. Seidel,R. Sell,A. Semenov,V. Shekelyan,I. Sheviakov,H. Shooshtari,L.N. Shtarkov,G. Siegmon,U. Siewert, Y. Sirois,I.O. Skillicorni,P. Smirnov,J.R. Smith,Y. Soloviev,H. Spitzer,R. Starosta,M. Steenbock,P. Steffen,R. Steinberg,B. Stella,K. Stephens,J. Stier,J. Stiewe,U. Stösslein,J. Strachota, U. Straumann,W. Struczinski,J.P Sutton, S. Tapprogge,R.E. Taylor, V. Tchernyshov,C. Thiebaux,G. Thompson, P. Truöl,J. Turnau,J. Tutas,P. Uelkes,A. Usik, S. Valkár,A. Valkárová,C. Vallée,P. Van Esch,P. Van Mechelen, A. Vartapetian,Y. Vazdik,M. Vecko, P. Verrecchia,G. Villet,K. Wacker,A. Wagener,M. Wagener,I.W. Walker,A. Walther,G. Weber, M. Weber,D. Wegener,A. Wegner,H.P. Wellisch,L.R. West,S. Willard,M. Winde,G.-G. Winter,A.E. Wright,E. Wünsch,N. Wulff,T.P. Yiou,J. Žáček,D. Zarbock,Z. Zhang, A. Zhokin,M. Zimmer,W. Zimmermann,F. Zomer,K. Zuber

Nuclear Physics B（1995）

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摘要

Events with no hadronic energy flow in a large interval of pseudo-rapidity in the proton direction are observed in photon-proton interactions at an average centre of mass energy 〈√sγp〉 of 200 GeV These events are interpreted as photon diffractive dissociation. Evidence for hard scattering in photon diffractive dissociation is demonstrated using inclusive single particle spectra, thrust as a function of transverse energy, and the observation of jet production. The data can be described by a Monte Carlo calculation including hard photon-pomeron scattering.

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