Diffractive photoproduction of J/psi mesons with large momentum transfer at HERA

Summary, in English

The diffractive photoproduction of J/psi mesons is measured with the HI detector at the ep collider HERA using an integrated luminosity of 78 pb(-1). The differential cross section dsigma(gammap --> J/psiY)/dt is studied in the range 2 < < 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 W-gammap in three t intervals, spanning the range 50 < W-gammap < 200 GeV. A fast rise of the cross section with W-gammap is observed for each t range and the slope for the effective linear Pomeron trajectory is measured to be alpha' = -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. (C) 200 Published by Elsevier B.V.

• Author: A Aktas; V Andreev; T Anthonis; A Astvatsatourov; A Babaev; S Backovic; J Bahr; P Baranov; E Barrelet; W Bartel; S Baumgartner; J Becker; M Beckingham; A Beglarian; O Behnke; O Behrendt; A Belousov; C Berger; T Berndt; JC Bizot; J Bohme; MO Boenig; V Boudry; J Bracinik; W Braunschweig; V Brisson; HB Broker; DP Brown; D Bruncko; FW Busser; A Bunyatyan; A Burrage; G Buschhorn; L Bystritskaya; AJ Campbell; S Caron; F Cassol-Brunner; V Chekelian; D Clarke; C Collard; JG Contreras; YR Coppens; JA Coughlan; MC Cousinou; BE Cox; G Cozzika; J Cvach; JB Dainton; WD Dau; K Daum; 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 Dubak; C Duprel; G Eckerlin; V Efremenko; S Egli; R Eichler; F Eisele; M Ellerbrock; E Elsen; M Erdmann; W Erdmann; PJW Faulkner; L Favart; A Fedotov; R Felst; J Ferencei; S Ferron; M Fleischer; R Fleischmann; YH Fleming; G Flucke; G Flugge; A Fomenko; I Foresti; J Formanek; G Franke; G Frising; E Gabathuler; K Gabathuler; J Garvey; J Gassner; J Gayler; R Gerhards; C Gerlich; S Ghazaryan; L Goerlich; N Gogitidze; S Gorbounov; C Grab; V Grabski; H Grassler; T Greenshaw; G Grindhammer; D Haidt; L Hajduk; J Haller; B Heinemann; G Heinzelmann; RCW Henderson; H Henschel; O Henshaw; R Heremans; G Herrera; I Herynek; M Hildebrandt; M Hilgers; KH Hiller; J Hladky; P Hoting; D Hoffmann; R Horisberger; A Hovhannisyan; M Ibbotson; M Jacquet; L Janauschek; X Janssen; V Jemanov; Leif Jönsson; C Johnson; DP Johnson; MAS Jones; Hannes Jung; D Kant; M Kapichine; Martin Karlsson; J Katzy; R Keil; N Keller; J Kennedy; IR Kenyon; C Kiesling; M Klein; C Kleinwort; T Kluge; G Knies; B Koblitz; SD Kolya; V Korbel; P Kostka; R Koutouev; A Koutov; J Kroseberg; K Kruger; J Kueckens; T Kuhr; MPJ Landon; W Lange; T Lastovika; P Laycock; A Lebedev; B Leissner; R Lemrani; V Lendermann; S Levonian; B List; E Lobodzinska; N Loktionova; R Lopez-Fernandez; V Lubimov; H Lueders; S Luders; D Luke; L Lytkin; A Makankine; N Malden; E Malinovski; S Mangano; P Marage; J Marks; R Marshall; HU Martyn; J Martyniak; SJ Maxfield; D Meer; A Mehta; K Meier; AB Meyer; H Meyer; J Meyer; S Michine; S Mikocki; D Milstead; S Mohrdieck; F Moreau; A Morozov; JV Morris; K Muller; P Murin; V Nagovizin; B Naroska; J Naumann; T Naumann; PR Newman; F Niebergall; C Niebuhr; D Nikitin; G Nowak; M Nozicka; B Olivier; JE Olsson; D Ozerov; V Panassik; C Pascaud; GD Patel; M Peez; E Perez; A Petrukhin; JP Phillips; D Pitzl; R Poschl; B Povh; N Raicevic; J Rauschenberger; P Reimer; B Reisert; C Risler; E Rizvi; P Robmann; R Roosen; A Rostovtsev; S Rusakov; K Rybicki; DPC Sankey; E Sauvan; S Schatzel; J Scheins; FP Schilling; P Schleper; D Schmidt; S Schmidt; S Schmitt; M Schneider; L Schoeffel; A Schoning; V Schroder; HC Schultz-Coulong; C Schwanenberger; K Sedlak; F Sefkow; 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; G Thompson; PD Thompson; F Tomasz; D Traynor; P Truol; G Tsipolitis; I Tsurin; J Turnau; JE Turney; E Tzamariudaki; A Uraev; M Urban; A Usik; S Valkar; A Valkarova; C Vallee; P Van Mechelen; AV Trevino; S Vassiliev; Y Vazdik; C Veelken; A Vest; A Vichnevski; V Volchinski; K Wacker; J Wagner; R Wallny; B Waugh; G Weber; R Weber; D Wegener; C Werner; N Werner; M Wessels; B Wessling; M Winde; GG Winter; C Wissing; EE Woehrling; E Wunsch; AC Wyatt; J Zacek; J Zalesak; Z Zhang; A Zhokin; F Zomer; M zur Nedden
• Department/s: Particle and nuclear physics
• Publishing year: 2003
• Language: English
• Pages: 205-218
• Publication/Series: Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics
• Volume: 568
• Issue: 3-4
• Links: http://dx.doi.org/10.1016/j.physletb.2003.06.056
• Document type: Journal article
• Publisher: Elsevier
• Topic: Subatomic Physics
• Status: Published
• ISBN/ISSN/Other: ISSN: 0370-2693