Inelastic photoproduction of J/psi mesons at HERA

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title = "Inelastic photoproduction of J/psi mesons at HERA",
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.",
author = "C Adloff and V Andreev and B Andrieu and T Anthonis and A Astvatsatourov and A Babaev and J Bahr and P Baranov and E Barrelet and W Bartel and S Baumgartner and J Becker and M Beckingham and A Beglarian and O Behnke and C Beier and A Belousov and C Berger and T Berndt and JC Bizot and J Bohme and V Boudry and W Braunschweig and V Brisson and HB Broker and DP Brown and W Bruckner and D Bruncko and FW Busser and A Bunyatyan and A Burrage and G Buschhorn and L Bystritskaya and AJ Campbell and S Caron and F Cassol-Brunner and D Clarke and C Collard and JG Contreras and YR Coppens and JA Coughlan and MC Cousinou and BE Cox and G Cozzika and J Cvach and JB Dainton and WD Dau and Mattias Davidsson and B Delcourt and N Delerue and R Demirchyan and {De Roeck}, A and {De Wolf}, EA and C Diaconu and J Dingfelder and P Dixon and V Dodonov and JD Dowell and A Droutskoi and A Dubak and C Duprel and G Eckerlin and D Eckstein and V Efremenko and S Egli and R Eichler and F Eisele and E Eisenhandler and M Ellerbrock and E Elsen and M Erdmann and W Erdmann and PJW Faulkner and L Favart and A Fedotov and R Felst and J Ferencei and S Ferron and M Fleisher and P Fleischmann and YH Fleming and G Flugge and A Fomenko and I Foresti and J Formanek and G Franke and G Prising and E Gabathuler and K Gabathuler and J Garvey and J Gassner and J Gayler and R Gerhards and C Gerlich and S Ghazaryan and L Goerlich and N Gogitidze and C Grab and V Grabski and H Grassler and T Greenshaw and G Grindhammer and T Hadig and D Haidt and L Hajduk and J Haller and WJ Haynes and B Heinemann and G Heinzelmann and RCW Henderson and S Hengstmann and H Henschel and R Heremans and G Herrera and I Herynek and M Hildebrandt and M Hilgers and KH Hiller and J Hladky and P Hoting and D Hoffmann and R Horisberger and A Hovhannisyan and S Hurling and M Ibbotson and C Issever and M Jacquet and M Jaffre and L Janauschek and X Janssen and V Jemanov and Leif J{\"o}nsson and C Johnson and DP Johnson and MAS Jones and Hannes Jung and D Kant and M Kapichine and Martin Karlsson and O Karschnick and F Keil and N Keller and J Kennedy and IR Kenyon and S Kermiche and C Kiesling and P{\"a}r Kjellberg and M Klein and C Kleinwort and T Kluge and G Knies and B Koblitz and SD Kolya and V Korbel and P Kostka and SK Kotelnikov and R Koutouev and A Koutov and J Kroseberg and K Kruger and T Kuhr and T Kurca and D Lamb and MPJ Landon and W Lange and T Lastovicka and P Laycock and E Lebailly and A Lebedev and B Leissner and R Lemrani and V Lendermann and S Levonian and Magnus Lindstr{\"o}m and B List and E Lobodzinska and B Lobodzinski and A Loginov and N Lokuionova and V Lubimov and S Luders and D Luke and L Lytkin and N Malden and E Malinovski and I Malinovski and S Mangano and R Maracek and P Marage and J Marks and R Marshall and HU Martyn and J Martyniak and SJ Maxfield and D Meer and A Mehta and K Meier and AB Meyer and H Meyer and J Meyer and PO Meyer and S Mikocki and D Milstead and S Mohrdieck and MN Mondragon and F Moreau and A Morozov and JV Morris and K Muller and P Murin and V Nagovizin and B Naroska and J Naumann and T Naumann and G Nellen and PR Newman and F Niebergall and C Niebuhr and O Nix and G Nowak and M Nozicka and JE Olsson and D Ozerov and V Panassik and C Pascaud and GD Patel and M Peez and E Perez and A Petrukhin and JP Phillips and D Pitzl and R Poschl and I Potachnikova and B Povh and G Radel and J Rauschenberger and P Reimer and B Reisert and C Risler and E Rizvi and P Robmann and R Roosen and A Rostovtsev and S Rusakov and K Rybicki and DPC Sankey and S Schatzel and J Scheins and FP Schilling and P Schleper and D Schmidt and D Schmidt and S Schmidt and S Schmitt and M Schneider and L Schoeffel and A Schoning and T Schorner and V Schroder and HC Schultz-Coulon and C Schwanenberger and K Sedlak and F Sefkow and V Shekelyan and I Sheviakov and LN Shtarkov and Y Sirois and T Sloan and P Smirnov and Y Soloviev and D South and V Spaskov and A Specka and H Spitzer and R Stamen and B Stella and J Stiewe and I Strauch and U Straumann and M Swart and S Tchetchelnitski and G Thompson and PD Thompson and F Tomasz and D Traynor and P Truol and G Tsipolitis and I Tsurin and J Turnau and JE Turney and E Tzamariudaki and S Udluft and A Uraev and M Urban and A Usik and S Valkar and A Valkarova and C Vallee and {Van Mechelen}, P and S Vassiliev and Y Vazdik and A Vest and A Vichnevski and K Wacker and J Wagner and R Wallny and B Waugh and G Weber and D Wegener and C Werner and N Werner and M Wessels and G White and S Wiesand and T Wilksen and M Winde and GG Winter and C Wissing and M Wobisch and EE Woehrling and E Wunsch and AC Wyatt and J Zacek and J Zalesak and Z Zhang and A Zhokin and F Zomer and {zur Nedden}, M",
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)",
year = "2002",
doi = "10.1007/s10052-002-1009-8",
language = "English",
volume = "25",
pages = "25--39",
journal = "European Physical Journal C. Particles and Fields",
issn = "1434-6044",
publisher = "Springer",
number = "1",