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Diffractive photoproduction of $j/\psi$ mesons with large momentum transfer at HERA

A. Aktas V. Andreev T. Anthonis A. Astvatsatourov A. Babaev S. Backovic J. Bahr P. Baranov E. Barrelet 1 W. Bartel S. Baumgartner J. Becker M. Beckingham A. Beglarian O. Behnke O. Behrendt A. Belousov C. Berger T. Berndt J.C. Bizot 2 J. Bohme M.O. Boenig V. Boudry 3 J. Bracinik W. Braunschweig V. Brisson 2 H.B. Broker D.P. Brown D. Bruncko F.W. Busser A. Bunyatyan A. Burrage G. Buschhorn L. Bystritskaya A.J. Campbell S. Caron F. Cassol-Brunner 4 V. Chekelian D. Clarke C. Collard J.G. Contreras Y.R. Coppens J.A. Coughlan M.C. Cousinou 4 B.E. Cox G. Cozzika J. Cvach J.B. Dainton W.D. Dau K. Daum M. Davidsson B. Delcourt 2 N. Delerue 4 R. Demirchyan A. de Roeck E.A. de Wolf C. Diaconu 4 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 3 M. Fleischer P. Fleischmann Y.H. 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 R.C.W. Henderson H. Henschel O. Henshaw R. Heremans G. Herrera I. Herynek M. Hildebrandt M. Hilgers K.H. Hiller J. Hladky P. Hoting D. Hoffmann 4 R. Horisberger A. Hovhannisyan M. Ibbotson M. Jacquet 2 L. Janauschek X. Janssen V. Jemanov L. Jonsson 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. Kruger J. Kueckens T. Kuhr M.P.J. Landon W. Lange T. Lastovicka P. Laycock A. Lebedev B. Leiner 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 H.U. Martyn J. Martyniak S.J. Maxeld D. Meer A. Mehta K. Meier A.B. Meyer H. Meyer J. Meyer S. Michine S. Mikocki D. Milstead S. Mohrdieck F. Moreau 3 A. Morozov J.V. Morris K. Muller P. Murn V. Nagovizin B. Naroska J. Naumann T. 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 2 G.D. Patel M. Peez 4 Emile Perez A. Petrukhin J.P. 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 D.P.C. Sankey E. Sauvan 4 S. Schatzel J. Scheins F.P. Schilling P. Schleper D. Schmidt S. Schmidt S. Schmitt M. Schneider 4 L. Schoeffel A. Schoning V. Schroder H.C. Schultz-Coulon C. Schwanenberger K. Sedlak F. Sefkow I. Sheviakov L.N. Shtarkov Y. Sirois 3 T. Sloan P. Smirnov Y. Soloviev D. South V. Spaskov A. Specka 3 H. Spitzer R. Stamen B. Stella J. Stiewe I. Strauch U. Straumann G. Thompson P.D. Thompson F. Tomasz D. Traynor P. Truol G. Tsipolitis I. Tsurin J. Turnau J.E. Turney E. Tzamariudaki A. Uraev Martin Urban A. Usik S. Valkar A. Valkarova C. Vallee 4 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 C. Wissing E.E. Woehrling E. Wunsch A.C. Wyatt J. Zacek J. Zalesak Zhiqing Zhang 2 A. Zhokin F. Zomer 2 M. Zur Nedden
Abstract : 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.
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A. Aktas, V. Andreev, T. Anthonis, A. Astvatsatourov, A. Babaev, et al.. Diffractive photoproduction of $j/\psi$ mesons with large momentum transfer at HERA. Physics Letters B, Elsevier, 2003, 568, pp.205-218. ⟨in2p3-00014098⟩

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