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

• DOI: 10.1016/j.physletb.2003.06.056
• Publication Date: 2003-07-22T22:49:03Z
• Authors: A. Aktas; V. Andreev; T. Anthonis; A. Astvatsatourov; A. Babaev; S. Backovic; J. Bähr; P. Baranov; E. Barrelet; W. Bartel; S. Baumgartner; J. Becker; M. Beckingham; A. Beglarian; O. Behnke; O. Behrendt; A. Belousov; Ch. Berger; T. Berndt; J.C. Bizot; J. Böhme; M.-O. Boenig; V. Boudry; J. Bracinik; W. Braunschweig; V. Brisson; H.-B. Bröker; D.P. Brown; D. Bruncko; F.W. Büsser; A. Bunyatyan; A. Burrage; G. Buschhorn; L. Bystritskaya; A.J. Campbell; S. Caron; F. Cassol-Brunner; V. Chekelian; D. Clarke; C. Collard; J.G. Contreras; Y.R. Coppens; J.A. Coughlan; M.-C. Cousinou; B.E. Cox; G. Cozzika; J. Cvach; J.B. Dainton; W.D. Dau; K. Daum; M. Davidsson; B. Delcourt; N. Delerue; R. Demirchyan; A. De Roeck; E.A. De Wolf; C. Diaconu; J. Dingfelder; P. Dixon; V. Dodonov; J.D. Dowell; A. Dubak; C. Duprel; G. Eckerlin; V. Efremenko; S. Egli; R. Eichler; F. Eisele; M. Ellerbrock; E. Elsen; M. Erdmann; W. Erdmann; P.J.W. Faulkner; L. Favart; A. Fedotov; R. Felst; J. Ferencei; S. Ferron; M. Fleischer; P. Fleischmann; Y.H. Fleming; G. Flucke; G. Flügge; A. Fomenko; I. Foresti; J. Formánek; 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. Grässler; T. Greenshaw; G. Grindhammer; D. Haidt; L. Hajduk; J. Haller; B. Heinemann; G. Heinzelmann; R.C.W. Henderson; H. Henschel; O. Henshaw; R. Heremans; G. Herrera; I. Herynek; M. Hildebrandt; M. Hilgers; K.H. Hiller; J. Hladký; P. Höting; D. Hoffmann; R. Horisberger; A. Hovhannisyan; M. Ibbotson; M. Jacquet; L. Janauschek; X. Janssen; V. Jemanov; L. Jönsson; C. Johnson; D.P. Johnson; M.A.S. Jones; H. Jung; D. Kant; M. Kapichine; M. Karlsson; J. Katzy; F. Keil; N. Keller; J. Kennedy; I.R. Kenyon; C. Kiesling; M. Klein; C. Kleinwort; T. Kluge; G. Knies; B. Koblitz; S.D. Kolya; V. Korbel; P. Kostka; R. Koutouev; A. Koutov; J. Kroseberg; K. Krüger; J. Kueckens; T. Kuhr; M.P.J. Landon; W. Lange; T. Laštovička; 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. Lüders; D. Lüke; L. Lytkin; A. Makankine; N. Malden; E. Malinovski; S. Mangano; P. Marage; J. Marks; R. Marshall; H.-U. Martyn; J. Martyniak; S.J. Maxfield; D. Meer; A. Mehta; K. Meier; A.B. Meyer; H. Meyer; J. Meyer; S. Michine; S. Mikocki; D. Milstead; S. Mohrdieck; F. Moreau; A. Morozov; J.V. Morris; K. Müller; P. Murı́n; V. Nagovizin; B. Naroska; J. Naumann; Th. Naumann; P.R. Newman; F. Niebergall; C. Niebuhr; D. Nikitin; G. Nowak; M. Nozicka; B. Olivier; J.E. Olsson; D. Ozerov; V. Panassik; C. Pascaud; G.D. Patel; M. Peez; E. Perez; A. Petrukhin; J.P. Phillips; D. Pitzl; R. Pöschl; B. Povh; N. Raicevic; J. Rauschenberger; P. Reimer; B. Reisert; C. Risler; E. Rizvi; P. Robmann; R. Roosen; A. Rostovtsev; S. Rusakov; K. Rybicki; D.P.C. Sankey; E. Sauvan; S. Schätzel; J. Scheins; F.-P. Schilling; P. Schleper; D. Schmidt; S. Schmidt; S. Schmitt; M. Schneider; L. Schoeffel; A. Schöning; V. Schröder; H.-C. Schultz-Coulon; C. Schwanenberger; K. Sedlák; F. Sefkow; I. Sheviakov; L.N. 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; P.D. Thompson; F. Tomasz; D. Traynor; P. Truöl; G. Tsipolitis; I. Tsurin; J. Turnau; J.E. Turney; E. Tzamariudaki; A. Uraev; M. Urban; A. Usik; S. Valkár; A. Valkárová; C. Vallée; P. Van Mechelen; A. Vargas 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; G.-G. Winter; Ch. Wissing; E.-E. Woehrling; E. Wünsch; A.C. Wyatt; J. Žáček; J. Zálešák; Z. Zhang; A. Zhokin; F. Zomer; M. zur Nedden
• Keywords: Nuclear and High Energy Physics; [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex]; Lipatov equation; diffraction; FOS: Physical sciences; 530; 01 natural sciences; 7. Clean energy; energy dependence; High Energy Physics - Experiment; DGLAP equation; High Energy Physics - Experiment (hep-ex); differential cross section: momentum transfer; J/psi(3100): photoproduction; 0103 physical sciences; [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]; Colliding beam accelerators; Electron collisions; Gamma ray; Gamma ray interactions (diffractive photoprodn. of J/y mesons with large momentum transfer at HERA); Perturbative QCD (diffractive photoprodn. of J/y mesons with large momentum transfer at HERA in relation to); spin: density matrix; quantum chromodynamics: perturbation theory; 300: 318 GeV-cms; info:eu-repo/classification/ddc/530; pomeron: exchange; helicity: conservation law; positron p: colliding beams; DESY HERA Stor; electron p: colliding beams; positron p --> J/psi(3100) positron anything; Physique des particules élémentaires; H1; experimental results

The diffractive photoproduction of J/psi mesons is measured with the H1 detector at the ep collider HERA using an integrated luminosity of 78 pb^-1. The differential cross section d sigma(gamma p -> J/psi Y) / d t is studied in the range 2 < |t| < 30 GeV^2, 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 in three t intervals, spanning the range 50 < W < 200 GeV. A fast rise of the cross section with W is observed for each t range and the slope for the effective linear Pomeron trajectory is measured to be alpha^\prime= -0.0135 \pm 0.0074 (stat.) \pm 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.<br/>21 pages, 6 figures and 6 tables<br/>