Diffractive photoproduction of J/ψ mesons with large momentum transfer at HERA
Å. AktasVladimir Andreevak Physik-Institut der Universität Zürich , Zürich , SwitzerlandT. AnthonisInter-University Institute for High Energies ULB-VUB , Brussels ;A. AstvatsatourovDESY, Zeuthen, GermanyA. BabaevLPNHE, Universités Paris VI and VII, IN2P3-CNRS, Paris, FranceS. BackovićDESY, Zeuthen, GermanyJ. BährDESY, Zeuthen, GermanyP. BaranovLebedev Physical Institute, Moscow, RussiaE. BarreletInstitut National de Physique Nucléaire et de Physique des ParticulesW. BartelS. BaumgartnerInstitut für Teilchenphysik , ETH , Zürich , SwitzerlandJ. Beckerak Physik-Institut der Universität Zürich , Zürich , SwitzerlandM. BeckinghamPhysics Department , University of Manchester , Manchester , UKA. BeglarianYerevan Physics Institute, Yerevan, ArmeniaO. BehnkePhysikalisches Institut , Universität Heidelberg , Heidelberg , GermanyO. BehrendtInstitut für Physik , Universität Dortmund , Dortmund , GermanyA. Belousovak Physik-Institut der Universität Zürich , Zürich , SwitzerlandCh. BergerI. Physikalisches Institut der RWTH, Aachen, GermanyT. BerndtKirchhoff-Institut für Physik , Universität Heidelberg , Heidelberg , GermanyJ.C. BizotInstitut National de Physique Nucléaire et de Physique des ParticulesJ. BöhmeDESY , Hamburg , GermanyM.-O. BoenigInstitut für Physik , Universität Dortmund , Dortmund , GermanyV. BoudryLPNHE, Ecole Polytechnique, IN2P3-CNRS, Palaiseau, FranceJ. BraciníkMax Planck Institute of PsychiatryW. BraunschweigI. Physikalisches Institut der RWTH , Aachen , GermanyV. BrissonLAL, Université de Paris-Sud, IN2P3-CNRS, Orsay, FranceH.-B. BrökerIII. Physikalisches Institut der RWTH , Aachen , GermanyDunstan BrownD. BrunckoInstitute of Experimental Physics, Slovak Academy of Sciences, Košice, Slovak RepublicF.W. BüsserInstitut für Experimentalphysik , Universität Hamburg , Hamburg , GermanyA. BunyatyanMax-Planck-Institut für Kernphysik, Heidelberg, GermanyA. BurrageDepartment of Physics , University of Liverpool , Liverpool , UKG. BuschhornMax-Planck-Institut für Physik , München , GermanyL. BystritskayaInstitute for Theoretical and Experimental Physics, Moscow, RussiaA.J. CampbellS. CaronI. Physikalisches Institut der RWTH , Aachen , GermanyF. Cassol-BrunnerCPPM, CNRS/IN2P3, University Mediterranee, Marseille, FranceV. ChekelianMax-Planck-Institut für Physik , München , GermanyD. ClarkeRutherford Appleton Laboratory , Chilton , Didcot , UKC. CollardLAL, Université de Paris-Sud, IN2P3-CNRS, Orsay, FranceJ.G. ContrerasAlso at Dept. Fis. Ap. CINVESTAV , Mérida , Yucatán , MéxicoY.R. CoppensSchool of Physics and Space Research , University of Birmingham , Birmingham , UKJ. A. CoughlanRutherford Appleton Laboratory , Chilton , Didcot , UKM.-C. CousinouCentre de physique des particules de MarseilleB. E. CoxPhysics Department , University of Manchester , Manchester , UKG. CozzikaCEA , DSM/DAPNIA , CE-Saclay , Gif-sur-Yvette , FranceJ. CvachCentre National de la Recherche ScientifiqueJ.B. DaintonDESY, Zeuthen, GermanyW.D. DauUniversiteit Antwerpen (UIA) , Antwerpen , BelgiumK. DaumAlso at Rechenzentrum , Bergische Universität Gesamthochschule Wuppertal , GermanyMarcus Davidssonak Physik-Institut der Universität Zürich , Zürich , SwitzerlandB. DelcourtInstitut National de Physique Nucléaire et de Physique des ParticulesNicolas DelerueCPPM, CNRS/IN2P3, University Mediterranee, Marseille, FranceR. DemirchyanYerevan Physics Institute , Yerevan , ArmeniaA. De RoeckAlso at CERN , Geneva , SwitzerlandE. A. De WolfDESY, Hamburg, GermanyC. DiaconuUniversité Paris CitéJ. DingfelderHeidelberg UniversityP. DixonProvince of AntwerpV. DodonovMax Planck Institute for Nuclear PhysicsJ.D. DowellSchool of Physics and Space Research , University of Birmingham , Birmingham , UKA. DubakPhysik-Institut der Universität Zürich, Zürich, SwitzerlandC. DuprelInstitut National de Physique Nucléaire et de Physique des ParticulesG. EckerlinV. EfremenkoUniversiteit Antwerpen (UIA) , Antwerpen , BelgiumS. EgliPaul Scherrer Institut , Villigen , SwitzerlandR. EichlerAlso at Physics Department, National Technical University, Zografou Campus, GR-15773 Athens, GreeceF. EiseleInstitute for Nuclear Physics, Cracow, PolandM. EllerbrockInstitute for Nuclear Physics, Cracow, PolandE. ElsenAlso at Physics Department, National Technical University, Zografou Campus, GR-15773 Athens, GreeceM. ErdmannAlso at Institut für Experimentelle Kernphysik, Universität Karlsruhe, Karlsruhe, GermanyPeter FaulknerJoint Institute for Nuclear Research, Dubna, RussiaL. FavartInstitute for Nuclear Physics, Cracow, PolandA. FedotovUK Science and Engineering Research Council R. FelstDESY , Hamburg , GermanyJ. FerenceiLAL, Université de Paris-Sud, IN2P3-CNRS, Orsay, FranceS. FerronLPNHE, Ecole Polytechnique, IN2P3-CNRS, Palaiseau, FranceM. FleischerAlso at Physics Department, National Technical University, Zografou Campus, GR-15773 Athens, GreeceP. FleischmannDESY , Hamburg , GermanyY.H. FlemingAlso at Physics Department, National Technical University, Zografou Campus, GR-15773 Athens, GreeceG. FluckeAlso at Physics Department, National Technical University, Zografou Campus, GR-15773 Athens, GreeceG. FlüggeAlso at Physics Department, National Technical University, Zografou Campus, GR-15773 Athens, GreeceA. FomenkoProvince of AntwerpI. ForestiUniversité Paris CitéJ. FormánekUniversité Paris CitéG. FrankeAlso at Physics Department, National Technical University, Zografou Campus, GR-15773 Athens, GreeceG. FrisingLPNHE, Universités Paris VI and VII, IN2P3-CNRS, Paris, FranceE. GabathulerInstitute for Nuclear Physics, Cracow, PolandK. GabathulerAlso at Physics Department, National Technical University, Zografou Campus, GR-15773 Athens, GreeceJ. GarveySchool of Physics and Space Research , University of Birmingham , Birmingham , UKJ. GassnerInstitut National de Physique Nucléaire et de Physique des ParticulesJ. GaylerLAL, Université de Paris-Sud, IN2P3-CNRS, Orsay, FranceR. GerhardsDESY , Hamburg , GermanyC. GerlichPhysikalisches Institut , Universität Heidelberg , Heidelberg , GermanyS. GhazaryanYerevan Physics Institute , Yerevan , ArmeniaL. GoerlichInstitute for Nuclear Physics, Cracow, PolandN. Gogitidzel Max-Planck-Institut für Kernphysik , Heidelberg , GermanyS. GorbounovDESY , Zeuthen , GermanyC. GrabCentre National de la Recherche Scientifique
2003en
ABI
Annotatsiya
The diffractive photoproduction of J/ψ mesons is measured with the H1 detector at the ep collider HERA using an integrated luminosity of 78 pb−1. The differential cross section dσ(γp→J/ψY)/dt is studied in the range 2<|t|<30 GeV2, where t is the square of the four-momentum transferred at the proton vertex. The cross section is also presented as a function of the photon–proton centre-of-mass energy Wγp in three t intervals, spanning the range 50<Wγp<200 GeV. A fast rise of the cross section with Wγp is observed for each t range and the slope for the effective linear Pomeron trajectory is measured to be α′=−0.0135±0.0074(stat.)±0.0051(syst.) GeV−2. The measurements are compared with perturbative QCD models based on BFKL and DGLAP evolution. The data are found to be compatible with s-channel helicity conservation.
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