Dijet cross sections in photoproduction at HERA

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Research output: Contribution to journalArticlepeer-review

78 Citations (Scopus)

Abstract

Dijet production by almost real photons has been studied at HERA with the ZEUS detector. Jets have been identified using the cone algorithm. A cut on xγ OBS, the fraction of the photon energy participating in the production of the two jets of highest transverse energy, is used to define cross sections sensitive to the parton distributions in the proton and in the photon. The dependence of the dijet cross sections on pseudorapidity has been measured for xγ OBS ≥ 0.75 and xγ OBS < 0.75. The former is sensitive to the gluon momentum density in the proton. The latter is sensitive to the ginon in the photon. The cross sections are corrected for detector acceptance and compared to leading order QCD calculations.

Original languageEnglish
Pages (from-to)665-680
Number of pages16
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume348
Issue number3-4
DOIs
Publication statusPublished - 1995 Apr 6

Bibliographical note

Funding Information:
’ Supported by Worldlab, Lausanne, Switzerland. z Also at 1ROE Florence, Italy. f Now at Univ. of Salerno and INFN Napoli, Italy. 4 New a self-employed consultant. s On leave of absence. IJN ow at Institut fdr Hochenergiephysik,U niv. Heidelberg. ‘Now at MPl Berlin. sNow also at Univ. of Torino. g Presently at Columbia Univ., supported by DAADIHSPII-AUFB. lo Now at Inst. of Computer Science, Jagellonian Univ., Cracow. ” Now at Univ. of Mainz. ‘* Supported by the European Community. I3 Now with OPAL Collaboration, Faculty of Physics at Univ. of Freiburg. I4 Now at SAS-lnstitut GmbH, Heidelberg. I5 Also supported by DESY. I6 Now at GSI Darmstadt. I7 Also supported by NSERC. I8 Now at Institute for Cosmic Ray Research,U niv. of Tokyo. I9 On IeAve of absence at DFSY, supported by DGICYT. Z” Now at Carleton Univ., Ottawa, Canada. *’ Now at Deptiment of Energy, Washington. ** Now at HBP Div., Argonne National Lab., Argonne, IL, USA. 23 Now at RHBNC. Univ. of London, England. 24 Fulbright Scholar 1993-1994. zs Now at Cambridge Consultants, Cambridge, UK. 26 On leave and pattially supported by DBSY 1993-95.

Funding Information:
search and Technology (BMFT) . 42 Supported by the German Federal Ministry for Research and Technology (BMFT), the Volkswagen Foundation, and the Deutsche Forschungsgemeinschaft. 43 Supported by the Spanish Ministry of Education and Science through funds provided by CICYT. 4.1S upported by the Particle Physics and Astronomy Research Council. 45 Supported by the US Department of Energy. 46 Supported by the US National Science Foundation,

Funding Information:
*’ Suppofled by a MlNERVA Fellowship. 2RP artially sqyorted ‘by DESY. 2g Now at Centre for SubatomicR esearchU, niv.of Alberta, Canada and TRIUME Vancouver,C an&a. M Supported by the Natural Sciences and Engineering Research Council of Canada (NSERC) . I’ Supported by the FCAR of Qutbec, Canada. ‘* Supposed by the German Federal Ministry for Research and Technology ( BMm) . 33 Supportedb y the MINERVA Gesellschaftf iir ForschungG mbH, and by the Israel Acaoemy of Science. 34 Supportedb y the German Israeli Foundation, and by the Israel Academy of Science. j5 Supportedb y the Italian National Institute for Nuclear Physics WQW. 36 Supported by the JapaneseM inistry of Education, Science and Culture (the Monbusbo) and its grants for Scientific Research. .17S upported by the Korean Ministry of Education and Korea Science and Engineering Foundation. 38 Supportedb y the NetherlandsF oundationfor Researcho n Matter (FOM). 39 Supportedb y the Polish State Committee for Scientific Research (grant No. SPBIP3/202/93) and the Foundation for Polish-German Collaboration (proj. No. 506192). 4o Supportedb y,tbe Polish State Cornmitt& for Scientific Research (grant No. PB 861/2/91 and Nd. 2 2372 9102, grant No. Pp 2 2376 9102 au4 No. PB 2 0092 9101). 4’ P&ally supported by the German Federal Ministly fdr Re-

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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