Measurement of diffractive scattering of photons with large momentum transfer at HERA
F. D. AaronNational Institute for Physics and Nuclear Engineering (NIPNE), Bucharest, RomaniaC. AlexaNational Institute for Physics and Nuclear Engineering (NIPNE), Bucharest, RomaniaV. AndreevLebedev Physical Institute, Moscow, Russia 10B. AntunovićS. AplinA. AsmoneA. AstvatsatourovInter-University Institute for High Energies ULB-VUB, Brussels, and Universiteit Antwerpen, Antwerpen, Belgium 5Alessandro BacchettaS. BackovićFaculty of Science, University of Montenegro, Podgorica, Montenegro 10A. BaghdasaryanYerevan Physics Institute, Yerevan, ArmeniaP. BaranovLebedev Physical Institute, Moscow, Russia 10E. BarreletUniversité Paris CitéW. BartelM. BeckinghamK. BegzsurenInstitute of Physics and TechnologyO. BehnkePhysikalisches Institut, Universität Heidelberg, Heidelberg, Germany 3A. BelousovLebedev Physical Institute, Moscow, Russia 10N. BergerInstitut für Teilchenphysik, ETH, Zürich, Switzerland 12J.C. BizotCentre National de la Recherche ScientifiqueM.-O. BoenigInstitut für Physik, TU Dortmund, Dortmund, Germany 3V. BoudryLLR, Ecole Polytechnique, IN2P3-CNRS, Palaiseau, FranceI. Božović-Jelisavc̆ićVinca Institute of Nuclear Sciences, Belgrade, SerbiaJ. BraciníkCentre National de la Recherche ScientifiqueG. BrandtMartin BrinkmannV. BrissonLAL, Univ Paris-Sud, CNRS/IN2P3, Orsay, FranceD. BrunckoYerevan Physics Institute, Yerevan, ArmeniaA. BunyatyanMax-Planck-Institut für Kernphysik, Heidelberg, GermanyG. BuschhornMax-Planck-Institut für Physik, München, GermanyL. BystritskayaInstitute for Theoretical and Experimental Physics, Moscow, RussiaAlan CampbellK. B. Cantun AvilaInstitute of Physics and Technology of the Mongolian Academy of Sciences, Ulaanbaatar, MongoliaF. Cassol-BrunnerCentre de physique des particules de MarseilleK. ČernýFaculty of Mathematics and Physics, Charles University, Praha, Czech Republic 11V. ČernýComenius University BratislavaV. ChekelianMax-Planck-Institut für Physik, München, GermanyA. CholewaJ.G. ContrerasDepartamento de Fisica Aplicada, CINVESTAV, Mérida, Yucatán, Mexico 9J. A. CoughlanRutherford Appleton Laboratory, Chilton, Didcot, UK 4G. CozzikaCEA Paris-SaclayJ. CvachCzech Academy of Sciences, Institute of SociologyJ.B. DaintonDepartment of Physics, University of Liverpool, Liverpool, UK 4K. DaumAlso at Rechenzentrum, Universität Wuppertal, Wuppertal, GermanyMichal DeákY. de BoerDESY, Hamburg, GermanyB. DelcourtCentre National de la Recherche ScientifiqueM. Del DeganInstitut für Teilchenphysik, ETH, Zürich, Switzerland 12J. DelvaxInter-University Institute for High Energies ULB-VUB, Brussels, and Universiteit Antwerpen, Antwerpen, Belgium 5A. De RoeckAlso at CERN, Geneva, SwitzerlandE. A. De WolfInter-University Institute for High Energies ULB-VUB, Brussels, and Universiteit Antwerpen, Antwerpen, Belgium 5C. DiaconuLAL, Univ Paris-Sud, CNRS/IN2P3, Orsay, FranceV. DodonovMax-Planck-Institut für Kernphysik, Heidelberg, GermanyA. DossanovMax-Planck-Institut für Physik, München, GermanyA. DubakFaculty of Science, University of Montenegro, Podgorica, Montenegro 10G. EckerlinV. EfremenkoInstitute for Theoretical and Experimental Physics, Moscow, RussiaS. EgliPaul Scherrer Institut, Villigen, SwitzerlandA. EliseevLebedev Physical Institute, Moscow, Russia 10E. ElsenS. EssenovInstitute for Theoretical and Experimental Physics, Moscow, RussiaA. FalkiewiczInstitute for Nuclear Physics, Cracow, Poland 6Peter FaulknerSchool of Physics and Astronomy, University of Birmingham, Birmingham, UK 4L. FavartInter-University Institute for High Energies ULB-VUB, Brussels, and Universiteit Antwerpen, Antwerpen, Belgium 5A. FedotovInstitute for Theoretical and Experimental Physics, Moscow, RussiaR. FelstJ. FeltesseInstitut National de Physique Nucléaire et de Physique des ParticulesJ. FerenceiInstitute of Experimental Physics of the Slovak Academy of SciencesL. FinkeM. FleischerA. FomenkoLebedev Physical Institute, Moscow, Russia 10E. GabathulerDepartment of Physics, University of Liverpool, Liverpool, UK 4J. GaylerDESY, Hamburg, GermanyS. GhazaryanYerevan Physics Institute, Yerevan, ArmeniaA. GlazovI. GlushkovDESY, Zeuthen, GermanyL. GoerlichInstitute for Nuclear Physics, Cracow, Poland 6M. GoettlichInstitut für Experimentalphysik, Universität Hamburg, Hamburg, Germany 3N. GogitidzeLebedev Physical Institute, Moscow, Russia 10M. GouzevitchLLR, Ecole Polytechnique, IN2P3-CNRS, Palaiseau, FranceC. GrabInstitut National de Physique Nucléaire et de Physique des ParticulesT. GreenshawInstitut National de Physique Nucléaire et de Physique des ParticulesB.R. GrellG. GrindhammerMax-Planck-Institut für Physik, München, GermanyS. HabibInstitut für Experimentalphysik, Universität Hamburg, Hamburg, Germany 3D. HaidtDESY, Hamburg, GermanyM. HanssonPhysics Department, University of Lund, Lund, Sweden 8C. HelebrantDESY, Hamburg, GermanyR. C. W. HendersonDepartment of Physics, University of Lancaster, Lancaster, UK 4H. HenschelDESY, Zeuthen, GermanyG. HerreraDepartamento de Fisica, CINVESTAV, Mexico 9M. HildebrandtPaul Scherrer Institut, Villigen, SwitzerlandK. H. HillerDESY, Zeuthen, GermanyD. HoffmannCPPM, CNRS/IN2P3 – Univ. Mediterranee, Marseille, FranceR. HorisbergerPaul Scherrer Institut, Villigen, SwitzerlandA. HovhannisyanYerevan Physics Institute, Yerevan, ArmeniaT. HreusInteruniversity Institute for High EnergiesM. JacquetLAL, Univ Paris-Sud, CNRS/IN2P3, Orsay, FranceM.E. JanssenX. JanssenNational Institute for Physics and Nuclear Engineering (NIPNE), Bucharest, RomaniaV. JemanovInstitut für Experimentalphysik, Universität Hamburg, Hamburg, Germany 3
2009en
ABI
Annotatsiya
The first measurement of diffractive scattering of quasi-real photons with large momentum transfer γ p → γ Y , where Y is the proton dissociative system, is made using the H1 detector at HERA. The measurement is performed for initial photon virtualities Q 2 < 0.01 GeV 2 . Single differential cross sections are measured as a function of W , the incident photon–proton centre of mass energy, and t , the square of the four-momentum transferred at the proton vertex, in the range 175 < W < 247 GeV and 4 < | t | < 36 GeV 2 . The W dependence is well described by a model based on perturbative QCD using a leading logarithmic approximation of the BFKL evolution. The measured | t | dependence is harder than that predicted by the model and those observed in exclusive vector meson production.
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