Deeply virtual Compton scattering and its beam charge asymmetry in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:msup><mml:mi>e</mml:mi><mml:mo>±</mml:mo></mml:msup><mml:mi>p</mml:mi></mml:math> collisions at HERA
F. D. AaronNational Institute for Physics and Nuclear Engineering (NIPNE), Bucharest, RomaniaM. Aldaya MartinC. AlexaNational Institute for Physics and Nuclear Engineering (NIPNE), Bucharest, RomaniaK. AlimujiangV. AndreevLebedev Physical Institute, Moscow, Russia 20B. AntunovićS. BackovićFaculty of Science, University of Montenegro, Podgorica, Montenegro 20A. BaghdasaryanYerevan Physics Institute, Yerevan, ArmeniaE. BarreletSorbonne UniversitéW. BartelK. BegzsurenInstitute of Physics and Technology of the Mongolian Academy of Sciences, Ulaanbaatar, MongoliaA. BelousovLebedev Physical Institute, Moscow, Russia 20J.C. BizotLAL, Univ. Paris-Sud, CNRS/IN2P3, Orsay, FranceV. BoudryÉcole PolytechniqueI. Božović-Jelisavc̆ićVinca Institute of Nuclear Sciences, Belgrade, SerbiaJ. BraciníkSchool of Physics and Astronomy, University of Birmingham, Birmingham, UKG. BrandtMartin BrinkmannInstitut für Experimentalphysik, Universität Hamburg, Hamburg, Germany 15V. BrissonInstitut National de Physique Nucléaire et de Physique des ParticulesD. BrunckoInstitute of Experimental Physics, Slovak Academy of Sciences, Košice, Slovak Republic 16A. BunyatyanYerevan Physics Institute, Yerevan, ArmeniaG. BuschhornMax-Planck-Institut für Physik, München, GermanyL. BystritskayaVinca Institute of Nuclear Sciences, Belgrade, SerbiaAlan CampbellK. B. Cantun AvilaDepartamento de Fisica Aplicada, CINVESTAV, Mérida, Yucatán, Mexico 18K. ČernýFaculty of Mathematics and Physics, Charles University, Praha, Czech Republic 21V. ČernýInstitute of Experimental Physics of the Slovak Academy of SciencesV. ChekelianMax-Planck-Institut für Physik, München, GermanyA. CholewaJ.G. ContrerasDepartamento de Fisica Aplicada, CINVESTAV, Mérida, Yucatán, Mexico 18J. A. CoughlanRutherford Appleton Laboratory, Chilton, Didcot, UK 12G. CozzikaCEA, DSM/Irfu, CE-Saclay, Gif-sur-Yvette, FranceJ. CvachInstitute of Physics, Academy of Sciences of the Czech Republic, Praha, Czech Republic 21J.B. DaintonDepartment of Physics, University of Liverpool, Liverpool, UK 12K. DaumFachbereich C, Universität Wuppertal, Wuppertal, GermanyMichal DeákY. de BoerLLR, Ecole Polytechnique, IN2P3-CNRS, Palaiseau, FranceB. DelcourtCentre National de la Recherche ScientifiqueM. Del DeganInstitut für Teilchenphysik, ETH, Zürich, Switzerland 22J. DelvaxInter-University Institute for High Energies ULB-VUB, Brussels and Universiteit Antwerpen, Antwerpen, Belgium 13E. A. De WolfInter-University Institute for High Energies ULB-VUB, Brussels and Universiteit Antwerpen, Antwerpen, Belgium 13C. DiaconuCentre de physique des particules de MarseilleV. DodonovLAL, Univ. Paris-Sud, CNRS/IN2P3, Orsay, FranceA. DossanovMax-Planck-Institut für Physik, München, GermanyA. DubakAlso at Max-Planck-Institut für Physik, München, GermanyG. EckerlinV. EfremenkoInstitut National de Physique Nucléaire et de Physique des ParticulesS. EgliLAL, Univ. Paris-Sud, CNRS/IN2P3, Orsay, FranceA. EliseevLebedev Physical Institute, Moscow, Russia 20E. ElsenVinca Institute of Nuclear Sciences, Belgrade, SerbiaA. FalkiewiczInstitute for Nuclear Physics, Cracow, Poland 14L. FavartInter-University Institute for High Energies ULB-VUB, Brussels and Universiteit Antwerpen, Antwerpen, Belgium 13A. FedotovInstitute for Theoretical and Experimental Physics, Moscow, Russia 19R. FelstJ. FeltesseInstitut de Recherche sur les Lois Fondamentales de l'UniversJ. FerenceiInstitute of Experimental Physics, Slovak Academy of Sciences, Košice, Slovak Republic 16D.-J. FischerM. FleischerA. FomenkoLebedev Physical Institute, Moscow, Russia 20E. GabathulerVinča Institute of Nuclear SciencesJ. GaylerS. GhazaryanYerevan Physics Institute, Yerevan, ArmeniaA. GlazovI. GlushkovGerman Institute for Adult Education – Leibniz Centre for Lifelong LearningL. GoerlichVinca Institute of Nuclear Sciences, Belgrade, SerbiaN. GogitidzeLebedev Physical Institute, Moscow, Russia 20M. GouzevitchC. GrabInstitut für Teilchenphysik, ETH, Zürich, Switzerland 22T. GreenshawDepartment of Physics, University of Liverpool, Liverpool, UK 12B.R. GrellG. GrindhammerMax-Planck-Institut für Physik, München, GermanyS. HabibUniversität HamburgD. HaidtC. HelebrantR. C. W. HendersonDepartment of Physics, University of Lancaster, Lancaster, UK 12E. HennekemperKirchhoff-Institut für Physik, Universität Heidelberg, Heidelberg, Germany 15H. HenschelDESY, Zeuthen, GermanyM. HerbstKirchhoff-Institut für Physik, Universität Heidelberg, Heidelberg, Germany 15G. HerreraDepartamento de Fisica, CINVESTAV, Mexico 18M. HildebrandtPaul Scherrer Institut, Villigen, SwitzerlandK. H. HillerDESY, Zeuthen, GermanyD. HoffmannCPPM, CNRS/IN2P3 – Univ. Mediterranee, Marseille, FranceR. HorisbergerPaul Scherrer Institut, Villigen, SwitzerlandT. HreusInter-University Institute for High Energies ULB-VUB, Brussels and Universiteit Antwerpen, Antwerpen, Belgium 13M. JacquetLAL, Univ. Paris-Sud, CNRS/IN2P3, Orsay, FranceM.E. JanssenX. JanssenInter-University Institute for High Energies ULB-VUB, Brussels and Universiteit Antwerpen, Antwerpen, Belgium 13L. JönssonVinca Institute of Nuclear Sciences, Belgrade, SerbiaA. JungKirchhoff-Institut für Physik, Universität Heidelberg, Heidelberg, Germany 15H. JungDESY, Hamburg, GermanyM. KapichineJoint Institute for Nuclear Research, Dubna, RussiaJ. KatzyI. R. KenyonSchool of Physics and Astronomy, University of Birmingham, Birmingham, UK 12C. KieslingMax-Planck-Institut für Physik, München, GermanyM. KleinDepartment of Physics, University of Liverpool, Liverpool, UK 12C. KleinwortT. KlugeDepartment of Physics, University of Liverpool, Liverpool, UK 12A. KnutssonR. KoglerMax-Planck-Institut für Physik, München, GermanyP. KostkaDESY, Zeuthen, Germany
2009en
ABI
Аннотация
A measurement of elastic deeply virtual Compton scattering γ ∗ p → γ p using e + p and e − p collision data recorded with the H1 detector at HERA is presented. The analysed data sample corresponds to an integrated luminosity of 306 pb −1 , almost equally shared between both beam charges. The cross section is measured as a function of the virtuality Q 2 of the exchanged photon and the centre-of-mass energy W of the γ ∗ p system in the kinematic domain 6.5 < Q 2 < 80 GeV 2 , 30 < W < 140 GeV and | t | < 1 GeV 2 , where t denotes the squared momentum transfer at the proton vertex. The cross section is determined differentially in t for different Q 2 and W values and exponential t -slope parameters are derived. Using e + p and e − p data samples, a beam charge asymmetry is extracted for the first time in the low Bjorken x kinematic domain. The observed asymmetry is attributed to the interference between Bethe–Heitler and deeply virtual Compton scattering processes. Experimental results are discussed in the context of two different models, one based on generalised parton distributions and one based on the dipole approach.
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