Inelastic production of J/ψ mesons in photoproduction and deep inelastic scattering at HERA

F. D. Aaron; C. Alexa; V. Andreev; B. Antunovic; S. Backovic; A. Baghdasaryan; E. Barrelet; W. Bartel; K. Begzsuren; A. Belousov; J. C. Bizot; V. Boudry; I. Bozovic-Jelisavcic; J. Bracinik; G. Brandt; M. Brinkmann; V. Brisson; D. Bruncko; A. Bunyatyan; G. Buschhorn; L. Bystritskaya; A. J. Campbell; K. B. Cantun Avila; K. Cerny; V. Cerny; V. Chekelian; A. Cholewa; J. G. Contreras; J. A. Coughlan; G. Cozzika; J. Cvach; J. B. Dainton; K. Daum; M. Deák; B. Delcourt; J. Delvax; E. A. De Wolf; C. Diaconu; V. Dodonov; A. Dossanov; A. Dubak; G. Eckerlin; V. Efremenko; S. Egli; A. Eliseev; E. Elsen; A. Falkiewicz; L. Favart; A. Fedotov; R. Felst; J. Feltesse; J. Ferencei; D.-J. Fischer; M. Fleischer; A. Fomenko; E. Gabathuler; J. Gayler; S. Ghazaryan; A. Glazov; L. Goerlich; N. Gogitidze; M. Gouzevitch; C. Grab; A. Grebenyuk; T. Greenshaw; B. R. Grell; G. Grindhammer; S. Habib; D. Haidt; C. Helebrant; R. C. W. Henderson; E. Hennekemper; H. Henschel; M. Herbst; G. Herrera; M. Hildebrandt; K. H. Hiller; D. Hoffmann; R. Horisberger; T. Hreus; M. Jacquet; X. Janssen; L. Jönsson; A. W. Jung; H. Jung; M. Kapichine; J. Katzy; I. R. Kenyon; C. Kiesling; M. Klein; C. Kleinwort; T. Kluge; A. Knutsson; R. Kogler; P. Kostka; M. Kraemer; K. Krastev; J. Kretzschmar; A. Kropivnitskaya; K. Krüger; K. Kutak; M. P. J. Landon; W. Lange; G. Laštovička-Medin; P. Laycock; A. Lebedev; V. Lendermann; S. Levonian; G. Li; K. Lipka; A. Liptaj; B. List; J. List; N. Loktionova; R. Lopez-Fernandez; V. Lubimov; A. Makankine; E. Malinovski; P. Marage; Ll. Marti; H.-U. Martyn; S. J. Maxfield; A. Mehta; A. B. Meyer; H. Meyer; J. Meyer; S. Mikocki; I. Milcewicz-Mika; F. Moreau; A. Morozov; J. V. Morris; M. U. Mozer; M. Mudrinic; K. Müller; P. Murín; Th. Naumann; P. R. Newman; C. Niebuhr; A. Nikiforov; D. Nikitin; G. Nowak; K. Nowak; J. E. Olsson; S. Osman; D. Ozerov; P. Pahl; V. Palichik; I. Panagoulias; M. Pandurovic; Th. Papadopoulou; C. Pascaud; G. D. Patel; E. Perez; A. Petrukhin; I. Picuric; S. Piec; D. Pitzl; R. Plačakytė; B. Pokorny; R. Polifka; B. Povh; V. Radescu; N. Raicevic; A. Raspiareza; T. Ravdandorj; P. Reimer; E. Rizvi; P. Robmann; R. Roosen; A. Rostovtsev; M. Rotaru; J. E. Ruiz Tabasco; S. Rusakov; D. Šálek; D. P. C. Sankey; M. Sauter; E. Sauvan; S. Schmitt; L. Schoeffel; A. Schöning; H.-C. Schultz-Coulon; F. Sefkow; R. N. Shaw-West; L. N. Shtarkov; S. Shushkevich; T. Sloan; I. Smiljanic; Y. Soloviev; P. Sopicki; D. South; V. Spaskov; A. Specka; Z. Staykova; M. Steder; B. Stella; G. Stoicea; U. Straumann; D. Sunar; T. Sykora; G. Thompson; P. D. Thompson; T. Toll; F. Tomasz; T. H. Tran; D. Traynor; P. Truöl; I. Tsakov; B. Tseepeldorj; J. Turnau; K. Urban; A. Valkárová; C. Vallée; P. Van Mechelen; A. Vargas Trevino; Y. Vazdik; V. Volchinski; M. von den Driesch; D. Wegener; Ch. Wissing; E. Wünsch; J. Žáček; J. Zálešák; Z. Zhang; A. Zhokin; T. Zimmermann; H. Zohrabyan; F. Zomer

doi:10.1140/epjc/s10052-010-1376-5

2022 Impact factor 4.4

Particles and Fields

Open Access

Eur. Phys. J. C (2010) 68: 401-420
https://doi.org/10.1140/epjc/s10052-010-1376-5

Regular Article - Experimental Physics

Inelastic production of J/ψ mesons in photoproduction and deep inelastic scattering at HERA

The H1 Collaboration
F. D. Aaron⁶, C. Alexa⁶, V. Andreev²⁶, B. Antunovic¹², S. Backovic³¹, A. Baghdasaryan³⁹, E. Barrelet³⁰, W. Bartel¹², K. Begzsuren³⁶, A. Belousov²⁶, J. C. Bizot²⁸, V. Boudry²⁹, I. Bozovic-Jelisavcic², J. Bracinik³, G. Brandt¹², M. Brinkmann¹³, V. Brisson²⁸, D. Bruncko¹⁷, A. Bunyatyan¹⁴^,39, G. Buschhorn²⁷, L. Bystritskaya²⁵, A. J. Campbell¹², K. B. Cantun Avila²³, K. Cerny³³, V. Cerny¹⁷, V. Chekelian²⁷, A. Cholewa¹², J. G. Contreras²³, J. A. Coughlan⁷, G. Cozzika¹¹, J. Cvach³², J. B. Dainton¹⁹, K. Daum³⁸, M. Deák¹², B. Delcourt²⁸, J. Delvax⁴^,5, E. A. De Wolf⁴^,5, C. Diaconu²², V. Dodonov¹⁴, A. Dossanov²⁷, A. Dubak³¹, G. Eckerlin¹², V. Efremenko²⁵, S. Egli³⁷, A. Eliseev²⁶, E. Elsen¹², A. Falkiewicz⁸, L. Favart⁴^,5, A. Fedotov²⁵, R. Felst¹², J. Feltesse¹¹, J. Ferencei¹⁷, D.-J. Fischer¹², M. Fleischer¹², A. Fomenko²⁶, E. Gabathuler¹⁹, J. Gayler¹², S. Ghazaryan¹², A. Glazov¹², L. Goerlich⁸, N. Gogitidze²⁶, M. Gouzevitch¹², C. Grab⁴¹, A. Grebenyuk¹², T. Greenshaw¹⁹, B. R. Grell¹², G. Grindhammer²⁷, S. Habib¹³, D. Haidt¹², C. Helebrant¹², R. C. W. Henderson¹⁸, E. Hennekemper¹⁶, H. Henschel⁴⁰, M. Herbst¹⁶, G. Herrera²⁴, M. Hildebrandt³⁷, K. H. Hiller⁴⁰, D. Hoffmann²², R. Horisberger³⁷, T. Hreus⁴^,5, M. Jacquet²⁸, X. Janssen⁴^,5, L. Jönsson²¹, A. W. Jung¹⁶, H. Jung¹²^,4^,5, M. Kapichine¹⁰, J. Katzy¹², I. R. Kenyon³, C. Kiesling²⁷, M. Klein¹⁹, C. Kleinwort¹², T. Kluge¹⁹, A. Knutsson¹², R. Kogler²⁷, P. Kostka⁴⁰, M. Kraemer¹², K. Krastev¹², J. Kretzschmar¹⁹, A. Kropivnitskaya²⁵, K. Krüger¹⁶^*, K. Kutak¹², M. P. J. Landon²⁰, W. Lange⁴⁰, G. Laštovička-Medin³¹, P. Laycock¹⁹, A. Lebedev²⁶, V. Lendermann¹⁶, S. Levonian¹², G. Li²⁸, K. Lipka¹², A. Liptaj²⁷, B. List¹³, J. List¹², N. Loktionova²⁶, R. Lopez-Fernandez²⁴, V. Lubimov²⁵, A. Makankine¹⁰, E. Malinovski²⁶, P. Marage⁴^,5, Ll. Marti¹², H.-U. Martyn¹, S. J. Maxfield¹⁹, A. Mehta¹⁹, A. B. Meyer¹², H. Meyer³⁸, J. Meyer¹², S. Mikocki⁸, I. Milcewicz-Mika⁸, F. Moreau²⁹, A. Morozov¹⁰, J. V. Morris⁷, M. U. Mozer⁴^,5, M. Mudrinic², K. Müller⁴², P. Murín¹⁷, Th. Naumann⁴⁰, P. R. Newman³, C. Niebuhr¹², A. Nikiforov¹², D. Nikitin¹⁰, G. Nowak⁸, K. Nowak⁴², J. E. Olsson¹², S. Osman²¹, D. Ozerov²⁵, P. Pahl¹², V. Palichik¹⁰, I. Panagoulias¹², M. Pandurovic², Th. Papadopoulou¹², C. Pascaud²⁸, G. D. Patel¹⁹, E. Perez¹¹, A. Petrukhin²⁵, I. Picuric³¹, S. Piec⁴⁰, D. Pitzl¹², R. Plačakytė¹², B. Pokorny³³, R. Polifka³³, B. Povh¹⁴, V. Radescu¹⁵, N. Raicevic³¹, A. Raspiareza²⁷, T. Ravdandorj³⁶, P. Reimer³², E. Rizvi²⁰, P. Robmann⁴², R. Roosen⁴^,5, A. Rostovtsev²⁵, M. Rotaru⁶, J. E. Ruiz Tabasco²³, S. Rusakov²⁶, D. Šálek³³, D. P. C. Sankey⁷, M. Sauter¹⁵, E. Sauvan²², S. Schmitt¹², L. Schoeffel¹¹, A. Schöning¹⁵, H.-C. Schultz-Coulon¹⁶, F. Sefkow¹², R. N. Shaw-West³, L. N. Shtarkov²⁶, S. Shushkevich²⁷, T. Sloan¹⁸, I. Smiljanic², Y. Soloviev²⁶, P. Sopicki⁸, D. South⁹, V. Spaskov¹⁰, A. Specka²⁹, Z. Staykova¹², M. Steder¹², B. Stella³⁴, G. Stoicea⁶, U. Straumann⁴², D. Sunar¹², T. Sykora⁴^,5, G. Thompson²⁰, P. D. Thompson³, T. Toll¹³, F. Tomasz¹⁷, T. H. Tran²⁸, D. Traynor²⁰, P. Truöl⁴², I. Tsakov³⁵, B. Tseepeldorj³⁶, J. Turnau⁸, K. Urban¹⁶, A. Valkárová³³, C. Vallée²², P. Van Mechelen⁴^,5, A. Vargas Trevino¹², Y. Vazdik²⁶, V. Volchinski³⁹, M. von den Driesch¹², D. Wegener⁹, Ch. Wissing¹², E. Wünsch¹², J. Žáček³³, J. Zálešák³², Z. Zhang²⁸, A. Zhokin²⁵, T. Zimmermann⁴¹, H. Zohrabyan³⁹ and F. Zomer²⁸

¹ I. Physikalisches Institut der RWTH, Aachen, Germany
² Vinca Institute of Nuclear Sciences, Belgrade, Serbia
³ School of Physics and Astronomy, University of Birmingham, Birmingham, UK
⁴ Inter-University Institute for High Energies ULB-VUB, Brussels, Belgium
⁵ Universiteit Antwerpen, Antwerpen, Belgium
⁶ National Institute for Physics and Nuclear Engineering (NIPNE), Bucharest, Romania
⁷ Rutherford Appleton Laboratory, Chilton, Didcot, UK
⁸ Institute for Nuclear Physics, Cracow, Poland
⁹ Institut für Physik, TU Dortmund, Dortmund, Germany
¹⁰ Joint Institute for Nuclear Research, Dubna, Russia
¹¹ CEA, DSM/Irfu, CE-Saclay, Gif-sur-Yvette, France
¹² DESY, Hamburg, Germany
¹³ Institut für Experimentalphysik, Universität Hamburg, Hamburg, Germany
¹⁴ Max-Planck-Institut für Kernphysik, Heidelberg, Germany
¹⁵ Physikalisches Institut, Universität Heidelberg, Heidelberg, Germany
¹⁶ Kirchhoff-Institut für Physik, Universität Heidelberg, Heidelberg, Germany
¹⁷ Institute of Experimental Physics, Slovak Academy of Sciences, Košice, Slovak Republic
¹⁸ Department of Physics, University of Lancaster, Lancaster, UK
¹⁹ Department of Physics, University of Liverpool, Liverpool, UK
²⁰ Queen Mary and Westfield College, London, UK
²¹ Physics Department, University of Lund, Lund, Sweden
²² CPPM, Aix-Marseille Université, CNRS/IN2P3, Marseille, France
²³ Departamento de Fisica Aplicada, CINVESTAV, Mérida, Yucatán, Mexico
²⁴ Departamento de Fisica, CINVESTAV IPN, México City, Mexico
²⁵ Institute for Theoretical and Experimental Physics, Moscow, Russia
²⁶ Lebedev Physical Institute, Moscow, Russia
²⁷ Max-Planck-Institut für Physik, München, Germany
²⁸ LAL, Université Paris-Sud, CNRS/IN2P3, Orsay, France
²⁹ LLR, Ecole Polytechnique, CNRS/IN2P3, Palaiseau, France
³⁰ LPNHE, Université Pierre et Marie Curie Paris 6, Université Denis Diderot Paris 7, CNRS/IN2P3, Paris, France
³¹ Faculty of Science, University of Montenegro, Podgorica, Montenegro
³² Institute of Physics, Academy of Sciences of the Czech Republic, Praha, Czech Republic
³³ Faculty of Mathematics and Physics, Charles University, Praha, Czech Republic
³⁴ Dipartimento di Fisica Università di Roma Tre and INFN Roma 3, Roma, Italy
³⁵ Institute for Nuclear Research and Nuclear Energy, Sofia, Bulgaria
³⁶ Institute of Physics and Technology of the Mongolian Academy of Sciences, Ulaanbaatar, Mongolia
³⁷ Paul Scherrer Institut, Villigen, Switzerland
³⁸ Fachbereich C, Universität Wuppertal, Wuppertal, Germany
³⁹ Yerevan Physics Institute, Yerevan, Armenia
⁴⁰ DESY, Zeuthen, Germany
⁴¹ Institut für Teilchenphysik, ETH, Zürich, Switzerland
⁴² Physik-Institut der Universität Zürich, Zürich, Switzerland

^* e-mail: kruegerk@mail.desy.de

Received: 2 February 2010
Revised: 25 May 2010
Published online: 15 July 2010

Abstract

A measurement is presented of inelastic photo- and electroproduction of J/ψ mesons in ep scattering at HERA. The data were recorded with the H1 detector in the period from 2004 to 2007. Single and double differential cross sections are determined and the helicity distributions of the J/ψ mesons are analysed. The results are compared to theoretical predictions in the colour singlet model and in the framework of non-relativistic QCD. Calculations in the colour singlet model using a k _T factorisation ansatz are able to give a good description of the data, while colour singlet model calculations to next-to-leading order in collinear factorisation underestimate the data.

© Springer-Verlag / Società Italiana di Fisica, 2010