Elastic and proton-dissociative photoproduction of J/ψ mesons at HERA

C. Alexa; V. Andreev; A. Baghdasaryan; S. Baghdasaryan; W. Bartel; K. Begzsuren; A. Belousov; P. Belov; V. Boudry; I. Bozovic-Jelisavcic; G. Brandt; M. Brinkmann; V. Brisson; D. Britzger; A. Buniatyan; A. Bylinkin; L. Bystritskaya; A. J. Campbell; K. B. Cantun Avila; F. Ceccopieri; K. Cerny; V. Chekelian; J. G. Contreras; J. Cvach; J. B. Dainton; K. Daum; E. A. De Wolf; C. Diaconu; M. Dobre; V. Dodonov; A. Dossanov; G. Eckerlin; S. Egli; E. Elsen; 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; G. Grindhammer; S. Habib; D. Haidt; R. C. W. Henderson; E. Hennekemper; M. Herbst; G. Herrera; M. Hildebrandt; K. H. Hiller; J. Hladkỳ; D. Hoffmann; R. Horisberger; T. Hreus; F. Huber; M. Jacquet; X. Janssen; L. Jönsson; H. Jung; M. Kapichine; C. Kiesling; M. Klein; C. Kleinwort; R. Kogler; P. Kostka; M. Krämer; J. Kretzschmar; K. Krüger; M. P. J. Landon; W. Lange; P. Laycock; A. Lebedev; S. Levonian; K. Lipka; B. List; J. List; B. Lobodzinski; R. Lopez-Fernandez; V. Lubimov; E. Malinovski; H.-U. Martyn; S. J. Maxfield; A. Mehta; A. B. Meyer; H. Meyer; J. Meyer; S. Mikocki; I. Milcewicz-Mika; A. Morozov; J. V. Morris; K. Müller; Th. Naumann; P. R. Newman; C. Niebuhr; D. Nikitin; G. Nowak; K. Nowak; J. E. Olsson; D. Ozerov; P. Pahl; V. Palichik; M. Pandurovic; C. Pascaud; G. D. Patel; E. Perez; A. Petrukhin; I. Picuric; H. Pirumov; D. Pitzl; R. Plačakytė; B. Pokorny; R. Polifka; V. Radescu; N. Raicevic; 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; S. Shushkevich; Y. Soloviev; P. Sopicki; D. South; V. Spaskov; A. Specka; Z. Staykova; M. Steder; B. Stella; G. Stoicea; U. Straumann; T. Sykora; P. D. Thompson; D. Traynor; P. Truöl; I. Tsakov; B. Tseepeldorj; J. Turnau; A. Valkárová; C. Vallée; P. Van Mechelen; Y. Vazdik; D. Wegener; E. Wünsch; J. Žáček; J. Zálešák; Z. Zhang; R. Žlebčík; H. Zohrabyan; F. Zomer

doi:10.1140/epjc/s10052-013-2466-y

2024 Impact factor 4.8

Particles and Fields

Open Access

Eur. Phys. J. C (2013) 73: 2466
https://doi.org/10.1140/epjc/s10052-013-2466-y

Regular Article - Experimental Physics

Elastic and proton-dissociative photoproduction of J/ψ mesons at HERA

The H1 Collaboration
C. Alexa⁶, V. Andreev²⁶, A. Baghdasaryan³⁸, S. Baghdasaryan³⁸, W. Bartel¹², K. Begzsuren³⁵, A. Belousov²⁶, P. Belov¹², V. Boudry²⁹, I. Bozovic-Jelisavcic², G. Brandt⁴², M. Brinkmann¹², V. Brisson²⁸, D. Britzger¹², A. Buniatyan¹⁵, A. Bylinkin²⁵, L. Bystritskaya²⁵, A. J. Campbell¹², K. B. Cantun Avila²³, F. Ceccopieri⁴^,5, K. Cerny³², V. Chekelian²⁷, J. G. Contreras²³, J. Cvach³¹, J. B. Dainton¹⁹, K. Daum³⁷^*, E. A. De Wolf⁴^,5, C. Diaconu²², M. Dobre⁶, V. Dodonov¹⁴, A. Dossanov¹³^,27, G. Eckerlin¹², S. Egli³⁶, E. Elsen¹², 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. Grab⁴⁰, A. Grebenyuk¹², T. Greenshaw¹⁹, G. Grindhammer²⁷, S. Habib¹², D. Haidt¹², R. C. W. Henderson¹⁸, E. Hennekemper¹⁶, M. Herbst¹⁶, G. Herrera²⁴, M. Hildebrandt³⁶, K. H. Hiller³⁹, J. Hladkỳ³¹, D. Hoffmann²², R. Horisberger³⁶, T. Hreus⁴^,5, F. Huber¹⁵, M. Jacquet²⁸, X. Janssen⁴^,5, L. Jönsson²¹, H. Jung¹²^,4^,5, M. Kapichine¹⁰, C. Kiesling²⁷, M. Klein¹⁹, C. Kleinwort¹², R. Kogler¹³, P. Kostka³⁹, M. Krämer¹², J. Kretzschmar¹⁹, K. Krüger¹², M. P. J. Landon²⁰, W. Lange³⁹, P. Laycock¹⁹, A. Lebedev²⁶, S. Levonian¹², K. Lipka¹², B. List¹², J. List¹², B. Lobodzinski¹², R. Lopez-Fernandez²⁴, V. Lubimov²⁵, E. Malinovski²⁶, H.-U. Martyn¹, S. J. Maxfield¹⁹, A. Mehta¹⁹, A. B. Meyer¹², H. Meyer³⁷, J. Meyer¹², S. Mikocki⁸, I. Milcewicz-Mika⁸, A. Morozov¹⁰, J. V. Morris⁷, K. Müller⁴¹, Th. Naumann³⁹, P. R. Newman³, C. Niebuhr¹², D. Nikitin¹⁰, G. Nowak⁸, K. Nowak¹³, J. E. Olsson¹², D. Ozerov¹², P. Pahl¹², V. Palichik¹⁰, M. Pandurovic², C. Pascaud²⁸, G. D. Patel¹⁹, E. Perez¹¹, A. Petrukhin¹², I. Picuric³⁰, H. Pirumov¹⁵, D. Pitzl¹², R. Plačakytė¹², B. Pokorny³², R. Polifka³², V. Radescu¹², N. Raicevic³⁰, T. Ravdandorj³⁵, P. Reimer³¹, E. Rizvi²⁰, P. Robmann⁴¹, R. Roosen⁴^,5, A. Rostovtsev²⁵, M. Rotaru⁶, J. E. Ruiz Tabasco²³, S. Rusakov²⁶, D. Šálek³², D. P. C. Sankey⁷, M. Sauter¹⁵, E. Sauvan²², S. Schmitt¹², L. Schoeffel¹¹, A. Schöning¹⁵, H.-C. Schultz-Coulon¹⁶, F. Sefkow¹², S. Shushkevich¹², Y. Soloviev¹²^,26, P. Sopicki⁸, D. South¹², V. Spaskov¹⁰, A. Specka²⁹, Z. Staykova⁴^,5, M. Steder¹², B. Stella³³, G. Stoicea⁶, U. Straumann⁴¹, T. Sykora³²^,4^,5, P. D. Thompson³, D. Traynor²⁰, P. Truöl⁴¹, I. Tsakov³⁴, B. Tseepeldorj³⁵, J. Turnau⁸, A. Valkárová³², C. Vallée²², P. Van Mechelen⁴^,5, Y. Vazdik²⁶, D. Wegener⁹, E. Wünsch¹², J. Žáček³², J. Zálešák³¹, Z. Zhang²⁸, R. Žlebčík³², H. Zohrabyan³⁸ and F. Zomer²⁸

¹ I. Physikalisches Institut der RWTH, Aachen, Germany
² Vinca Institute of Nuclear Sciences, University of Belgrade, 1100, 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, STFC, Didcot, Oxfordshire, 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 School of Physics and Astronomy, Queen Mary, University of London, London, UK
²¹ Physics Department, University of Lund, Lund, Sweden
²² CPPM, Aix-Marseille Univ, CNRS/IN2P3, 13288, Marseille, France
²³ Departamento de Fisica Aplicada, CINVESTAV, Mérida, Yucatán, México
²⁴ Departamento de Fisica, CINVESTAV IPN, México City, México
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 Faculty of Science, University of Montenegro, Podgorica, Montenegro
³¹ Institute of Physics, Academy of Sciences of the Czech Republic, Praha, Czech Republic
³² Faculty of Mathematics and Physics, Charles University, Praha, Czech Republic
³³ Dipartimento di Fisica, Università di Roma Tre and INFN Roma 3, Roma, Italy
³⁴ Institute for Nuclear Research and Nuclear Energy, Sofia, Bulgaria
³⁵ Institute of Physics and Technology of the Mongolian Academy of Sciences, Ulaanbaatar, Mongolia
³⁶ Paul Scherrer Institut, Villigen, Switzerland
³⁷ Fachbereich C, Universität Wuppertal, Wuppertal, Germany
³⁸ Yerevan Physics Institute, Yerevan, Armenia
³⁹ DESY, Zeuthen, Germany
⁴⁰ Institut für Teilchenphysik, ETH, Zürich, Switzerland
⁴¹ Physik-Institut der Universität Zürich, Zürich, Switzerland
⁴² Department of Physics, Oxford University, Oxford, UK

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

Received: 18 April 2013
Revised: 23 May 2013
Published online: 15 June 2013

Abstract

Cross sections for elastic and proton-dissociative photoproduction of J/ψ mesons are measured with the H1 detector in positron-proton collisions at HERA. The data were collected at ep centre-of-mass energies $\sqrt{s}\approx318~\mathrm{GeV}$ and $\sqrt {s}\approx225 \ \mbox{GeV}$ , corresponding to integrated luminosities of $\mathcal{L} = 130~\mbox{pb}^{-1}$ and $\mathcal{L} = 10.8~\mbox{pb}^{-1}$ , respectively. The cross sections are measured as a function of the photon-proton centre-of-mass energy in the range 25<W _γp<110 GeV. Differential cross sections dσ/dt, where t is the squared four-momentum transfer at the proton vertex, are measured in the range |t|<1.2 GeV² for the elastic process and |t|<8 GeV² for proton dissociation. The results are compared to other measurements. The W _γp and t-dependences are parametrised using phenomenological fits.