Abstract
Differential dijet cross sections have been measured with the ZEUS detector for photoproduction events in which the hadronic final state containing the jets is separated with respect to the outgoing proton direction by a large rapidity gap. The cross section has been measured as a function of the fraction of the photon (ϰγ OBS) and pomeron (β OBS) momentum participating in the production of the dijet system. The observed ϰγ OBS dependence shows evidence for the presence of a resolved- as well as a direct-photon component. The measured cross section da/dβ OBS increases as β OBS increases indicating that there is a sizeable contribution to dijet production from those events in which a large fraction of the pomeron momentum participates in the hard scattering. These cross sections and the ZEUS measurements of the diffractive structure function can be described by calculations based on parton densities in the pomeron which evolve according to the QCD evolution equations and include a substantial hard momentum component of gluons in the pomeron.
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supported by European Community Program PRAXIS XXI
MSU, supported by the GIF, contract 1-0444-176.07/95
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supported by JSPS Postdoctoral Fellowships for Research Abroad
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supported by the Polish State Committee for Scientific Research, grant No. 2P03B09308
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supported by the German Federal Ministry for Education and Science, Research and Technology (BMBF), under contract numbers 057BN19P, 057FR19P, 057HH19P, 057HH29P
supported by the MINERVA Gesellschaft für Forschung GmbH, the German Israeli Foundation, the U.S.-Israel Binational Science Foundation, and by the Israel Ministry of Science
supported by the German-Israeli Foundation, the Israel Science Foundation, the U.S.-Israel Binational Science Foundation, and by the Israel Ministry of Science
supported by the Italian National Institute for Nuclear Physics (INFN)
supported by the Japanese Ministry of Education, Science and Culture (the Monbusho) and its grants for Scientific Research
supported by the Korean Ministry of Education and Korea Science and Engineering Foundation
supported by the Netherlands Foundation for Research on Matter (FOM)
supported by the Polish State Committee for Scientific Research, grant No. 115/E-343/SPUB/P03/002/97, 2P03B10512, 2P03B10612, 2P03B14212, 2P03B10412
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supported by the Fund for Fundamental Research of Russian Ministry for Science and Education and by the German Federal Ministry for Education and Science, Research and Technology (BMBF)
supported by the Spanish Ministry of Education and Science through funds provided by CICYT
supported by the Particle Physics and Astronomy Research Council
supported by the US Department of Energy
supported by the US National Science Foundation
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Breitweg, J., Derrick, M., Krakauer, D. et al. Diffractive dijet cross sections in photoproduction at HERA. Eur. Phys. J. C 5, 41–56 (1998). https://doi.org/10.1007/s100529800937
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DOI: https://doi.org/10.1007/s100529800937