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Measurement of Di-jet Cross-Sections in Photoproduction and Photon Structure

C. Adloff V. Andreev B. Andrieu 1 V. Arkadov A. Astvatsatourov I. Ayyaz A. Babaev J. Bahr P. Baranov E. Barrelet W. Bartel U. Bassler P. Bate A. Beglarian O. Behnke C. Beier A. Belousov T. Benisch C. Berger G. Bernardi T. Berndt G. Bertrand-Coremans J C. Bizot K. Borras V. Boudry 1 W. Braunschweig V. Brisson H B. Broker D P. Brown W. Brckner Pascal Bruel D. Bruncko J. Brger F W. Bsser A. Bunyatyan S. Burke H. Burkhardt A. Burrage G. Buschhorn a J. Campbell J. Cao T. Carli S. Caron E. Chabert D. Clarke B. Clerbaux C. Collard J G. Contreras J A. Coughlan M C. Cousinou B E. Cox G. Cozzika J. Cvach J B. Dainton W D. Dau K. Daum M. David M. Davidsson B. Delcourt N. Delerue R. Demirchyan A. de Roeck E A. de Wolf C. Diaconu P. Dixon V. Dodonov K T. Donovan J D. Dowell A. Droutskoi C. Duprel J. Ebert G. Eckerlin D. Eckstein V. Efremenko S. Egli R. Eichler F. Eisele E. Eisenhandler M. Ellerbrock E. Elsen M. Erdmann P J W. Faulkner L. Favart A. Fedotov R. Felst J. Feltesse J. Ferencei F. Ferrarotto S. Ferron 1 M. Fleischer G. Flugge A. Fomenko I. Foresti J. Formnek J M. Foster G. Franke E. Gabathuler K. Gabathuler J. Garvey J. Gassner J. Gayler R. Gerhards S. Ghazaryan A. Glazov L. Grlich N. Gogitidze M. Goldberg C. Goodwin I. Gorelov C. Grab H. Grssler T. Greenshaw R K. Griffiths G. Grindhammer T. Hadig D. Haidt L. Hajduk V. Haustein W J. Haynes B. Heinemann G. Heinzelmann R C W. Henderson S. Hengstmann H. Henschel R. Heremans G. Herrera I. Herynek M. Hilgers K H. Hiller C D. Hilton J. Hladky P. Hoting D. Hoffmann W. Hoprich R. Horisberger S. Hurling M. Ibbotson C. Issever M. Jacquet M. Jaffr L. Janauschek D M. Jansen X. Janssen V. Jemanov L B. Jnsson D P. Johnson M a S. Jones H. Jung H K. Kastli D. Kant M. Kapichine M. Karlsson O. Karschnick O. Kaufmann M. Kausch F. Keil N. Keller J. Kennedy I R. Kenyon S. Kermiche C. Kiesling M. Klein C. Kleinwort G. Knies B. Koblitz H. Kolanoski S D. Kolya V. Korbel P. Kostka S K. Kotelnikov M W. Krasny H. Krehbiel J. Kroseberg D. Krucker K. Krger A. Kupper T. Kuhr T. Kurca R. Kutuev W. Lachnit R. Lahmann D. Lamb M P J. Landon W. Lange T. Lastovicka A. Lebedev B. Leiner V. Lematre R. Lemrani V. Lendermann S. Levonian M. Lindstrm G. Lobo E. Lobodzinska B. Lobodzinski N. Loktionova V. Lubimov S. Luders D. Luke L. Lytkin N. Magnussen H. Mahlke-Krger N. Malden E. Malinovskii I. Malinovski R. Maracek P. Marage J. Marks R. Marshall H U. Martyn J. Martyniak S J. Maxfield T R. Mcmahon A. Mehta K. Meier P. Merkel F. Metlica A. Meyer H. Meyer J. Meyer 1 P O. Meyer S. Mikocki D. Milstead T. Mkrtchyan R. Mohr S. Mohrdieck M N. Mondragon F. Moreau 1 A. Morozov J V. Morris D. Mller K. Muller P. Murn V. Nagovizin B. Naroska J. Naumann T. Naumann I. Negri P R. Newman H K. Nguyen T C. Nicholls F. Niebergall C. Niebuhr O. Nix G. Nowak T. Nunnemann J E. Olsson D. Ozerov V. Panassik C. Pascaud S. Passaggio G D. Patel Emile Perez J P. Phillips D. Pitzl R. Poschl I. Potachnikova B. Povh K. Rabbertz G. Rdel J. Rauschenberger P. Reimer B. Reisert D. Reyna S. Riess E. Rizvi P. Robmann R. Roosen A. Rostovtsev C. Royon S. Rusakov K. Rybicki D P C. Sankey J. Scheins F P. Schilling S. Schleif P. Schleper D. Schmidt L. Schoeffel A. Schning T. Schrner V. Schroder H C. Schultz-Coulon K. Sedlak F. Sefkow V. Shekelian I. Shevyakov L N. Shtarkov G. Siegmon P. Sievers Y. Sirois 1 T. Sloan P. Smirnov M. Smith V. Solochenko Yu. Solovev V. Spaskov A. Specka 1 H. Spitzer R. Stamen J. Steinhart B. Stella A. Stellberger J. Stiewe U. Straumann W. Struczinski J P. Sutton M. Swart M. Tasevsky V. Chernyshov S. Chechelnitskii G. Thompson P D. Thompson N. Tobien D. Traynor P. Truol G. Tsipolitis J. Turnau J E. Turney E. Tzamariudaki S. Udluft A. Usik S. Valkar A. Valkarova C. Vallee P. van Mechelen Ya. Vazdik G. Villet S. von Dombrowski K. Wacker R. Wallny T. Walter B. Waugh G. Weber M. Weber D. Wegener A. Wegner T. Wengler M. Werner L R. West G. White S. Wiesand T. Wilksen M. Winde G G. Winter C. Wissing M. Wobisch H. Wollatz E. Wunsch J. Zaicek J. Zaleisak Zhiqing Zhang A. Zhokin P. Zini F. Zomer J. Zsembery M. Zur Nedden
Abstract : The production of hard di-jet events in photoproduction at HERA is dominatedby resolved photon processes in which a parton in the photon with momentumfraction x_gamma is scattered from a parton in the proton. These processes aresensitive to the quark and gluon content of the photon. The differential di-jetcross-section dsigma/dlog(x_gamma) is presented here, measured in taggedphotoproduction at HERA using data taken with the H1 detector, corresponding toan integrated luminosity of 7.2 pb^(-1). Using a restricted data sample at hightransverse jet energy, E_(T,jet) 6 GeV, the effective parton densityf_gamma,eff(x_gamma) = [q(x_gamma) + bar(q)(x_gamma) +9/4g(x_gamma)] in thephoton in leading order QCD is measured down to x_gamma=0.05 from which thegluon density in the photon is derived.
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Submitted on : Tuesday, October 17, 2000 - 5:27:04 PM
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C. Adloff, V. Andreev, B. Andrieu, V. Arkadov, A. Astvatsatourov, et al.. Measurement of Di-jet Cross-Sections in Photoproduction and Photon Structure. Physics Letters B, Elsevier, 2000, 483, pp.36-48. ⟨in2p3-00017857⟩

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