Inelastic photoproduction of J/psi mesons at HERA

Research output: Contribution to journalArticle

Abstract

An analysis of inelastic photoproduction of J/psi mesons is presented using data collected at the ep collider HERA corresponding to an integrated luminosity of above 80 pb(-1), Differential and double I < P-t/psi(2) < differential cross sections are measured in a wide kinematic region: 60 < W-gammap < 260 GeV, 1 p(t,psi)(2) < 60 GeV2 and 0.05 < z < 0.9. where z is the fraction of the energy of the exchanged photon transferred to the J/psi meson in the rest frame of the target proton. Cross sections at z less than or similar to 0.3 are presented for the first time. Theoretical calculations within the Colour Singlet Model at NLO for direct photon processes are shown to give a good description of the data in the medium z region (0.3 < z < 0.9) up to the highest p(t,psi)(2) values. A calculation using a k(t) factorisation approach in LO in the Colour Singlet Model is also able to describe these data. The data in the full z range are also compared to LO calculations within a non-relativistic QCD framework including colour octet and colour singlet contributions for direct and resolved photons. It seems possible to reconcile data and theory with modest contributions from colour octet processes. The polarisation of the J/psi meson is measured as a function of z and p(t,psi) and is reasonably described by the theoretical predictions.

Details

Authors
  • C Adloff
  • V Andreev
  • B Andrieu
  • T Anthonis
  • A Astvatsatourov
  • A Babaev
  • J Bahr
  • P Baranov
  • E Barrelet
  • W Bartel
  • S Baumgartner
  • J Becker
  • M Beckingham
  • A Beglarian
  • O Behnke
  • C Beier
  • A Belousov
  • C Berger
  • T Berndt
  • JC Bizot
  • J Bohme
  • V Boudry
  • W Braunschweig
  • V Brisson
  • HB Broker
  • DP Brown
  • W Bruckner
  • D Bruncko
  • FW Busser
  • A Bunyatyan
  • A Burrage
  • G Buschhorn
  • L Bystritskaya
  • AJ Campbell
  • S Caron
  • F Cassol-Brunner
  • D Clarke
  • C Collard
  • JG Contreras
  • YR Coppens
  • JA Coughlan
  • MC Cousinou
  • BE Cox
  • G Cozzika
  • J Cvach
  • JB Dainton
  • WD Dau
  • Mattias Davidsson
  • B Delcourt
  • N Delerue
  • R Demirchyan
  • A De Roeck
  • EA De Wolf
  • C Diaconu
  • J Dingfelder
  • P Dixon
  • V Dodonov
  • JD Dowell
  • A Droutskoi
  • A Dubak
  • C Duprel
  • G Eckerlin
  • D Eckstein
  • V Efremenko
  • S Egli
  • R Eichler
  • F Eisele
  • E Eisenhandler
  • M Ellerbrock
  • E Elsen
  • M Erdmann
  • W Erdmann
  • PJW Faulkner
  • L Favart
  • A Fedotov
  • R Felst
  • J Ferencei
  • S Ferron
  • M Fleisher
  • P Fleischmann
  • YH Fleming
  • G Flugge
  • A Fomenko
  • I Foresti
  • J Formanek
  • G Franke
  • G Prising
  • E Gabathuler
  • K Gabathuler
  • J Garvey
  • J Gassner
  • J Gayler
  • R Gerhards
  • C Gerlich
  • S Ghazaryan
  • L Goerlich
  • N Gogitidze
  • C Grab
  • V Grabski
  • H Grassler
  • T Greenshaw
  • G Grindhammer
  • T Hadig
  • D Haidt
  • L Hajduk
  • J Haller
  • WJ Haynes
  • B Heinemann
  • G Heinzelmann
  • RCW Henderson
  • S Hengstmann
  • H Henschel
  • R Heremans
  • G Herrera
  • I Herynek
  • M Hildebrandt
  • M Hilgers
  • KH Hiller
  • J Hladky
  • P Hoting
  • D Hoffmann
  • R Horisberger
  • A Hovhannisyan
  • S Hurling
  • M Ibbotson
  • C Issever
  • M Jacquet
  • M Jaffre
  • L Janauschek
  • X Janssen
  • V Jemanov
  • C Johnson
  • DP Johnson
  • MAS Jones
  • Hannes Jung
  • D Kant
  • M Kapichine
  • Martin Karlsson
  • O Karschnick
  • F Keil
  • N Keller
  • J Kennedy
  • IR Kenyon
  • S Kermiche
  • C Kiesling
  • Pär Kjellberg
  • M Klein
  • C Kleinwort
  • T Kluge
  • G Knies
  • B Koblitz
  • SD Kolya
  • V Korbel
  • P Kostka
  • SK Kotelnikov
  • R Koutouev
  • A Koutov
  • J Kroseberg
  • K Kruger
  • T Kuhr
  • T Kurca
  • D Lamb
  • MPJ Landon
  • W Lange
  • T Lastovicka
  • P Laycock
  • E Lebailly
  • A Lebedev
  • B Leissner
  • R Lemrani
  • V Lendermann
  • S Levonian
  • Magnus Lindström
  • B List
  • E Lobodzinska
  • B Lobodzinski
  • A Loginov
  • N Lokuionova
  • V Lubimov
  • S Luders
  • D Luke
  • L Lytkin
  • N Malden
  • E Malinovski
  • I Malinovski
  • S Mangano
  • R Maracek
  • P Marage
  • J Marks
  • R Marshall
  • HU Martyn
  • J Martyniak
  • SJ Maxfield
  • D Meer
  • A Mehta
  • K Meier
  • AB Meyer
  • H Meyer
  • J Meyer
  • PO Meyer
  • S Mikocki
  • D Milstead
  • S Mohrdieck
  • MN Mondragon
  • F Moreau
  • A Morozov
  • JV Morris
  • K Muller
  • P Murin
  • V Nagovizin
  • B Naroska
  • J Naumann
  • T Naumann
  • G Nellen
  • PR Newman
  • F Niebergall
  • C Niebuhr
  • O Nix
  • G Nowak
  • M Nozicka
  • JE Olsson
  • D Ozerov
  • V Panassik
  • C Pascaud
  • GD Patel
  • M Peez
  • E Perez
  • A Petrukhin
  • JP Phillips
  • D Pitzl
  • R Poschl
  • I Potachnikova
  • B Povh
  • G Radel
  • J Rauschenberger
  • P Reimer
  • B Reisert
  • C Risler
  • E Rizvi
  • P Robmann
  • R Roosen
  • A Rostovtsev
  • S Rusakov
  • K Rybicki
  • DPC Sankey
  • S Schatzel
  • J Scheins
  • FP Schilling
  • P Schleper
  • D Schmidt
  • D Schmidt
  • S Schmidt
  • S Schmitt
  • M Schneider
  • L Schoeffel
  • A Schoning
  • T Schorner
  • V Schroder
  • HC Schultz-Coulon
  • C Schwanenberger
  • K Sedlak
  • F Sefkow
  • V Shekelyan
  • I Sheviakov
  • LN Shtarkov
  • Y Sirois
  • T Sloan
  • P Smirnov
  • Y Soloviev
  • D South
  • V Spaskov
  • A Specka
  • H Spitzer
  • R Stamen
  • B Stella
  • J Stiewe
  • I Strauch
  • U Straumann
  • M Swart
  • S Tchetchelnitski
  • G Thompson
  • PD Thompson
  • F Tomasz
  • D Traynor
  • P Truol
  • G Tsipolitis
  • I Tsurin
  • J Turnau
  • JE Turney
  • E Tzamariudaki
  • S Udluft
  • A Uraev
  • M Urban
  • A Usik
  • S Valkar
  • A Valkarova
  • C Vallee
  • P Van Mechelen
  • S Vassiliev
  • Y Vazdik
  • A Vest
  • A Vichnevski
  • K Wacker
  • J Wagner
  • R Wallny
  • B Waugh
  • G Weber
  • D Wegener
  • C Werner
  • N Werner
  • M Wessels
  • G White
  • S Wiesand
  • T Wilksen
  • M Winde
  • GG Winter
  • C Wissing
  • M Wobisch
  • EE Woehrling
  • E Wunsch
  • AC Wyatt
  • J Zacek
  • J Zalesak
  • Z Zhang
  • A Zhokin
  • F Zomer
  • M zur Nedden
Organisations
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Subatomic Physics
Original languageEnglish
Pages (from-to)25-39
JournalEuropean Physical Journal C. Particles and Fields
Volume25
Issue number1
Publication statusPublished - 2002
Publication categoryResearch
Peer-reviewedYes

Bibliographic note

The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Particle Physics (011013002), Chemical Physics (S) (011001060)