Abstract
This paper presents the first analysis of diffractive photon dissociation events in deep inelastic positron-proton scattering at HERA in which the proton in the final state is detected and its momentum measured. The events are selected by requiring a scattered proton in the ZEUS leading proton spectrometer (LPS) with χ L > 0.97, where xL is the fraction of the incoming proton beam momentum carried by the scattered proton. The use of the LPS significantly reduces the contamination from events with diffractive dissociation of the proton into low mass states and allows a direct measurement of t, the square of the four-momentum exchanged at the proton vertex. The dependence of the cross section ont is measured in the interval 0.073 < |t| < 0.4 GeV2 and is found to be described by an exponential shape with the slope parameterb = 7.2 ± 1.1(stat.) +0.7−0.9 (syst.) GeV−2. The diffractive structure function FD (4) is presented as 0.9 a function of χ H ≃ 1 − χ L and β, the momentum fraction of the struck quark with respect to χ H , and averaged over thet interval 0.073 < |t′ < 0.4 GeV2 and the photon virtuality range 5 <Q 2 < 20 GeV2. In the kinematic range 4 × 104 < χ p < 0.03 and 0.015 < β < 0.5, the χ p dependence ofF D(4) is fitted with a form (1/χ p )α , yieldinga − 1.00 ± 0.09 (stat.) +0.11−0.05 (syst.). Upon integration overL, the structure functionF 2 D(3) is determined in a kinematic range extending to higher χ p and lower β compared to our previous analysis; the results are discussed within the framework of Regge theory.
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also at IROE Florence, Italy
now at Univ. of Salerno and INFN Napoli, Italy
now at Univ. of Crete, Greece
supported by Worldlab, Lausanne, Switzerland
now at CERN
retired
also at University of Torino and Alexander von Humboldt Fellow at DESY
now at Dongshin University, Naju, Korea
also at DESY
Alfred P. Sloan Foundation Fellow
supported by the Polish State Committee for Scientific Research, grant No. 2P031314912
supported by an EC fellowship number ERBFMBICT 950172
now at SAP A.G., Walldorf
visitor from Florida State University
now at ALCATEL Mobile Communication GmbH, Stuttgart
supported by European Community Program PRAXIS XXI
now at DESY-Group FDET
now at DESY Computer Center
visitor from Kyungpook National University, Taegu, Korea, partially supported by DESY
now at Fermi National Accelerator Laboratory (FNAL), Batavia, IL, USA
now at NORCOM Infosystems, Hamburg
now at Oxford University, supported by DAAD fellowship HSP II-AUFE III
now at ATLAS Collaboration, Univ. of Munich
on leave from MSU, supported by the GIF, contract I-0444176.07/95
now a self-employed consultant
supported by an EC fellowship
PPARC Post-doctoral Fellow
now at Osaka Univ., Osaka, Japan
supported by JSPS Postdoctoral Fellowships for Research Abroad
now at Wayne State University, Detroit
partially supported by Comunidad Autonoma Madrid
partially supported by the Foundation for German-Russian Collaboration DFG-RFBR (grant no. 436 RUS 113/248/3 and no. 436 RUS 113/248/2)
now at Department of Energy, Washington
supported by the Feodor Lynen Program of the Alexander von Humboldt foundation
now at Lawrence Berkeley Laboratory, Berkeley, CA, USA
supported by a MINERVA Fellowship
now at ICEPP, Univ. of Tokyo; Tokyo, Japan
supported by the Polish State Committee for Scientific Research, grant No. 2P031309308
supported by the Polish State Committee for Scientific Research, grant No. 2P031309208
supported by the Natural Sciences and Engineering Research Council of Canada (NSERC)
supported by the FCAR of Québec, Canada
supported by the German Federal Ministry for Education and Science, Research and Technology (BMBF), under contract numbers 057BN19P, 057FR19P, 057HH19P, 057HH29P, 057SI75I
supported by the MINERVA Gesellschaft für Forschung GmbH, the German Israeli Foundation, and the U.S.-Israel Binational Science Foundation
supported by the German Israeli Foundation, and by the Israel Science Foundation
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, 2P031310512, 2P031310612, 2P0313142I2, 2P0313104I2
supported by the Polish State Committee for Scientific Research (grant No. 2P031308308) and Foundation for Polish-German Collaboration
partially supported by the German Federal Ministry for Education and Science, Research and Technology (BMBF)
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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ZEUS Collaboration., Breitweg, J., Derrick, M. et al. Measurement of the diffractive structure functionF 2 D(4) at HERA. Eur. Phys. J. C 1, 81–96 (1998). https://doi.org/10.1007/BF01245799
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DOI: https://doi.org/10.1007/BF01245799