Measurement of Dijet Cross-Sections at Low $Q^{2}$ and the Extraction of an Effective Parton Density for the Virtual Photon - IN2P3 - Institut national de physique nucléaire et de physique des particules Access content directly
Journal Articles European Physical Journal C: Particles and Fields Year : 2000

Measurement of Dijet Cross-Sections at Low $Q^{2}$ and the Extraction of an Effective Parton Density for the Virtual Photon

C. Adloff , V. Andreev , B. Andrieu (1) , V. Arkadov , A. Astvatsatourov , I. Ayyaz (2) , A. Babaev , J. Bahr , P. Baranov , E. Barrelet (2) , W. Bartel , U. Bassler (2) , P. Bate , A. Beglarian , O. Behnke , H.J. Behrend , C. Beier , A. Belousov , C. Berger , G. Bernardi (2) , T. Berndt , G. Bertrand-Coremans , P. Biddulph , J.C. Bizot (3) , V. Boudry (1) , W. Braunschweig , V. Brisson (3) , D.P. Brown , W. Bruckner , Pascal Bruel (1) , D. Bruncko , J. Burger , F.W. Busser , A. Buniatian , S. Burke , A. Burrage , G. Buschhorn , D. Calvet (4) , A.J. Campbell , T. Carli , E. Chabert (4) , M. Charlet , J. Chyla , D. Clarke , B. Clerbaux , J.G. Contreras , C. Cormack , J.A. Coughlan , M.C. Cousinou (4) , B.E. Cox , G. Cozzika , J. Cvach , J.B. Dainton , W.D. Dau , K. Daum , M. David , M. Davidsson , A. de Roeck , E.A. de Wolf , B. Delcourt (3) , R. Demirchian , C. Diaconu (4) , M. Dirkmann , P. Dixon , W. Dlugosz , K.T. Donovan , J.D. Dowell , A. Droutskoi , J. Ebert , G. Eckerlin , D. Eckstein , V. Efremenko , S. Egli , R. Eichler , F. Eisele , E. Eisenhandler , E. Elsen , M. Enzenberger , M. Erdmann , A.B. Fahr , P.J.W. Faulkner , L. Favart (3) , A. Fedotov , R. Felst , J. Feltesse , J. Ferencei , F. Ferrarotto , M. Fleischer , G. Flugge , A. Fomenko , J. Formanek , J.M. Foster , G. Franke , E. Gabathuler , K. Gabathuler , F. Gaede , J. Garvey , J. Gassner , J. Gayler , R. Gerhards , S. Ghazaryan , A. Glazov , L. Goerlich , N. Gogitidze , M. Goldberg (2) , I. Gorelov , C. Grab , H. Grassler , T. Greenshaw , R.K. Griffiths , G. Grindhammer , T. Hadig , D. Haidt , L. Hajduk , M. Hampel , V. Haustein , W.J. Haynes , B. Heinemann , G. Heinzelmann , R.C.W. Henderson , S. Hengstmann , H. Henschel , R. Heremans , I. Herynek , K. Hewitt , K.H. Hiller , C.D. Hilton , J. Hladky , D. Hoffmann , R. Horisberger , S. Hurling , M. Ibbotson , C. Issever , M. Jacquet (3) , M. Jaffre (3) , L. Janauschek , D.M. Jansen , L. Jonsson , D.P. Johnson , M. J. Jones , H. Jung , H.K. Kastli , M. Kander , D. Kant , M. Kapichine , M. Karlsson , O. Karschnik , J. Katzy , O. Kaufmann , M. Kausch , N. Keller , I.R. Kenyon , S. Kermiche (4) , C. Keuker , C. Kiesling , M. Klein , C. Kleinwort , G. Knies , J.H. Kohne , H. Kolanoski , S.D. Kolya , V. Korbel , P. Kostka , S.K. Kotelnikov , T. Kramerkamper , M.W. Krasny (2) , H. Krehbiel , D. Krucker , K. Kruger , A. Kupper , H. Kuster , M. Kuhlen , T. Kurca , W. Lachnit , R. Lahmann , D. Lamb , M.P.J. Landon , W. Lange , U. Langenegger , A. A. Lebedev , F. Lehner , V. Lemaitre , R. Lemrani , V. Lendermann , S. Levonian (1) , M. Lindstroem , G. Lobo (3) , E. Lobodzinska , V. Lubimov , S. Luders , D. Luke , L. Lytkin , N. Magnussen , H. Mahlke-Kruger , 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 , R. Mohr , S. Mohrdieck , M. Mondragon , F. Moreau (1) , A. Morozov , J.V. Morris , D. Muller , K. Muller , P. Murin , V. Nagovizin , B. Naroska , J. Naumann , T. Naumann , I. Negri (4) , P.R. Newman , H.K. Nguyen (2) , T.C. Nicholls , F. Niebergall , C. Niebuhr , C. Niedzballa , H. Niggli , O. Nix , G. Nowak , T. Nunnemann , H. Oberlack , J.E. Olsson , D. Ozerov , P. Palmen , V. Panassik , C. Pascaud , S. Passaggio , G.D. Patel , H. Pawletta , Emile Perez , J.P. Phillips , A. Pieuchot (4) , D. Pitzl , R. Poschl , G. Pope , B. Povh , K. Rabbertz , J. Rauschenberger , P. Reimer , B. Reisert , D. Reyna , H. Rick , S. Riess , E. Rizvi , P. Robmann , R. Roosen , K. Rosenbauer , A. Rostovtsev (2) , F. Rouse , C. Royon , S. Rusakov , K. Rybicki , D.P.C. Sankey , P. Schacht , J. Scheins , F.P. Schilling , S. Schleif , P. Schleper , D. Schmidt , L. Schoeffel , V. Schroder , H.C. Schultz-Coulon , F. Sefkow , A. Semenov , V. Shekelian , I. Shevyakov , L.N. Shtarkov , G. Siegmon , Y. Sirois (1) , T. Sloan , P. Smirnov , M. Smith , V. Solochenko , Yu. Solovev , V. Spaskov , A. Specka (1) , H. Spitzer , F. Squinabol (3) , R. Stamen , P. Steffen , R. Steinberg , J. Steinhart , B. Stella , A. Stellberger , J. Stiewe , U. Straumann , W. Struczinski , J.P. Sutton , M. Swart , S. Tapprogge , M. Tasevsky , V. Chernyshov , S. Chechelnitskii , J. Theissen , G. Thompson , P.D. Thompson , N. Tobien , R. Todenhagen , D. Traynor , P. Truol , G. Tsipolitis , J. Turnau , E. Tzamariudaki , S. Udluft , A. Usik , S. Valkar , A. Valkarova , C. Vallee (4) , P. van Esch , A. van Haecke , P. van Mechelen , Ya. Vazdik , G. Villet , 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 , S. Willard , M. Winde , G.G. Winter , C. Wissing , C. Wittek , E. Wittmann , M. Wobisch , H. Wollatz , E. Wunsch , J. Zacek , J. Zalesak , Zhiqing Zhang (3) , A. Zhokin , P. Zini (2) , F. Zomer (3) , J. Zsembery , M. Zur Nedden
C. Adloff
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V. Andreev
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V. Arkadov
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A. Astvatsatourov
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A. Babaev
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J. Bahr
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P. Baranov
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W. Bartel
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P. Bate
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A. Beglarian
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O. Behnke
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H.J. Behrend
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C. Beier
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A. Belousov
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C. Berger
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T. Berndt
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G. Bertrand-Coremans
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P. Biddulph
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V. Boudry
W. Braunschweig
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D.P. Brown
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W. Bruckner
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D. Bruncko
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J. Burger
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F.W. Busser
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A. Buniatian
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S. Burke
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A. Burrage
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G. Buschhorn
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D. Calvet
A.J. Campbell
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T. Carli
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M. Charlet
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J. Chyla
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D. Clarke
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B. Clerbaux
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J.G. Contreras
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C. Cormack
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J.A. Coughlan
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B.E. Cox
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G. Cozzika
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J. Cvach
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J.B. Dainton
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W.D. Dau
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K. Daum
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M. David
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M. Davidsson
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A. de Roeck
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E.A. de Wolf
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R. Demirchian
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M. Dirkmann
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P. Dixon
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W. Dlugosz
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K.T. Donovan
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Ya. Vazdik
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C. Wissing
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C. Wittek
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E. Wittmann
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M. Wobisch
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H. Wollatz
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E. Wunsch
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J. Zacek
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J. Zalesak
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Zhiqing Zhang
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A. Zhokin
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J. Zsembery
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M. Zur Nedden
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Abstract

The triple-differential dijet cross-section, d^3 sigma_{ep}/dQ2 dE_t2 dxgjets, is measured with the H1 detector at HERA as a function of the photon virtuality Q^2, the fraction of the photon's momentum carried by the parton entering the hard scattering, xgjets, and the square of the mean transverse energy, E_t2, of the two highest E_t jets. Jets are found using a longitudinal boost-invariant k_T clustering algorithm in the gamma* p center of mass frame. The measurements cover the ranges 1.6 Q^2 80 GeV$^2 in virtuality and 0.1 y 0.7 in inelasticity y. The results are well described by leading order QCD models which include the effects of a resolved component to the virtual photon. Models which treat the photon as point-like fail to describe the data. An effective leading order parton density for the virtual photon is extracted as a function of the photon virtuality, the probing scale and the parton momentum fraction. The x_gamma and probing scale dependences of the parton density show characteristic features of photon structure, and a suppression of this structure with increasing Q^2 is seen.

Dates and versions

in2p3-00014416 , version 1 (06-06-2000)

Identifiers

Cite

C. Adloff, V. Andreev, B. Andrieu, V. Arkadov, A. Astvatsatourov, et al.. Measurement of Dijet Cross-Sections at Low $Q^{2}$ and the Extraction of an Effective Parton Density for the Virtual Photon. European Physical Journal C: Particles and Fields, 2000, 13, pp.397-414. ⟨in2p3-00014416⟩
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