Journal of High Energy Physics (Dec 2022)
Measurement of the cross-section ratio σ ψ(2S) /σ J/ψ(1S) in exclusive photoproduction at HERA
- The ZEUS collaboration,
- I. Abt,
- M. Adamus,
- R. Aggarwal,
- V. Aushev,
- O. Behnke,
- A. Bertolin,
- I. Bloch,
- I. Brock,
- N. H. Brook,
- R. Brugnera,
- A. Bruni,
- P. J. Bussey,
- A. Caldwell,
- C. D. Catterall,
- J. Chwastowski,
- J. Ciborowski,
- R. Ciesielski,
- A. M. Cooper-Sarkar,
- M. Corradi,
- R. K. Dementiev,
- S. Dusini,
- J. Ferrando,
- B. Foster,
- E. Gallo,
- D. Gangadharan,
- A. Garfagnini,
- A. Geiser,
- G. Grzelak,
- C. Gwenlan,
- D. Hochman,
- N. Z. Jomhari,
- I. Kadenko,
- U. Karshon,
- P. Kaur,
- R. Klanner,
- U. Klein,
- I. A. Korzhavina,
- N. Kovalchuk,
- M. Kuze,
- B. B. Levchenko,
- A. Levy,
- B. Löhr,
- E. Lohrmann,
- A. Longhin,
- F. Lorkowski,
- I. Makarenko,
- J. Malka,
- S. Masciocchi,
- K. Nagano,
- J. D. Nam,
- Yu. Onishchuk,
- E. Paul,
- I. Pidhurskyi,
- A. Polini,
- M. Przybycień,
- A. Quintero,
- I. Rubinsky,
- M. Ruspa,
- U. Schneekloth,
- T. Schörner-Sadenius,
- I. Selyuzhenkov,
- M. Shchedrolosiev,
- L. M. Shcheglova,
- I. O. Skillicorn,
- W. Słomiński,
- A. Solano,
- L. Stanco,
- N. Stefaniuk,
- B. Surrow,
- K. Tokushuku,
- J. Tomaszewska,
- A. Trofymov,
- O. Turkot,
- T. Tymieniecka,
- A. Verbytskyi,
- W. A. T. Wan Abdullah,
- K. Wichmann,
- M. Wing,
- S. Yamada,
- Y. Yamazaki,
- A. F. Żarnecki,
- O. Zenaiev
Affiliations
- The ZEUS collaboration
- I. Abt
- Max-Planck-Institut für Physik
- M. Adamus
- National Centre for Nuclear Research
- R. Aggarwal
- DST-Inspire Faculty, Department of Technology, SPPU
- V. Aushev
- Department of Nuclear Physics, National Taras Shevchenko University of Kyiv
- O. Behnke
- Deutsches Elektronen-Synchrotron DESY
- A. Bertolin
- INFN Padova
- I. Bloch
- Deutsches Elektronen-Synchrotron DESY
- I. Brock
- Physikalisches Institut der Universität Bonn
- N. H. Brook
- Physics and Astronomy Department, University College London
- R. Brugnera
- Dipartimento di Fisica e Astronomia dell’ Università and INFN
- A. Bruni
- INFN Bologna
- P. J. Bussey
- School of Physics and Astronomy, University of Glasgow
- A. Caldwell
- Max-Planck-Institut für Physik
- C. D. Catterall
- Department of Physics, York University
- J. Chwastowski
- The Henryk Niewodniczanski Institute of Nuclear Physics, Polish Academy of Sciences
- J. Ciborowski
- Faculty of Physics, University of Warsaw
- R. Ciesielski
- Deutsches Elektronen-Synchrotron DESY
- A. M. Cooper-Sarkar
- Department of Physics, University of Oxford
- M. Corradi
- INFN Bologna
- R. K. Dementiev
- S. Dusini
- INFN Padova
- J. Ferrando
- Deutsches Elektronen-Synchrotron DESY
- B. Foster
- Department of Physics, University of Oxford
- E. Gallo
- Hamburg University, Institute of Experimental Physics
- D. Gangadharan
- Physikalisches Institut of the University of Heidelberg
- A. Garfagnini
- Dipartimento di Fisica e Astronomia dell’ Università and INFN
- A. Geiser
- Deutsches Elektronen-Synchrotron DESY
- G. Grzelak
- Faculty of Physics, University of Warsaw
- C. Gwenlan
- Department of Physics, University of Oxford
- D. Hochman
- Department of Particle Physics and Astrophysics, Weizmann Institute
- N. Z. Jomhari
- Deutsches Elektronen-Synchrotron DESY
- I. Kadenko
- Department of Nuclear Physics, National Taras Shevchenko University of Kyiv
- U. Karshon
- Department of Particle Physics and Astrophysics, Weizmann Institute
- P. Kaur
- Sant Longowal Institute of Engineering and Technology
- R. Klanner
- Hamburg University, Institute of Experimental Physics
- U. Klein
- Deutsches Elektronen-Synchrotron DESY
- I. A. Korzhavina
- N. Kovalchuk
- Hamburg University, Institute of Experimental Physics
- M. Kuze
- Department of Physics, Tokyo Institute of Technology
- B. B. Levchenko
- A. Levy
- Raymond and Beverly Sackler Faculty of Exact Sciences, School of Physics, Tel Aviv University
- B. Löhr
- Deutsches Elektronen-Synchrotron DESY
- E. Lohrmann
- Hamburg University, Institute of Experimental Physics
- A. Longhin
- Dipartimento di Fisica e Astronomia dell’ Università and INFN
- F. Lorkowski
- Deutsches Elektronen-Synchrotron DESY
- I. Makarenko
- Deutsches Elektronen-Synchrotron DESY
- J. Malka
- Deutsches Elektronen-Synchrotron DESY
- S. Masciocchi
- Physikalisches Institut of the University of Heidelberg
- K. Nagano
- Institute of Particle and Nuclear Studies, KEK
- J. D. Nam
- Department of Physics, Temple University
- Yu. Onishchuk
- Department of Nuclear Physics, National Taras Shevchenko University of Kyiv
- E. Paul
- Physikalisches Institut der Universität Bonn
- I. Pidhurskyi
- Institut für Kernphysik, Goethe Universität
- A. Polini
- INFN Bologna
- M. Przybycień
- AGH University of Science and Technology, Faculty of Physics and Applied Computer Science
- A. Quintero
- Department of Physics, Temple University
- I. Rubinsky
- Deutsches Elektronen-Synchrotron DESY
- M. Ruspa
- Università del Piemonte Orientale, Novara, and INFN
- U. Schneekloth
- Deutsches Elektronen-Synchrotron DESY
- T. Schörner-Sadenius
- Deutsches Elektronen-Synchrotron DESY
- I. Selyuzhenkov
- GSI Helmholtzzentrum für Schwerionenforschung GmbH
- M. Shchedrolosiev
- Deutsches Elektronen-Synchrotron DESY
- L. M. Shcheglova
- I. O. Skillicorn
- School of Physics and Astronomy, University of Glasgow
- W. Słomiński
- Department of Physics, Jagellonian University
- A. Solano
- Università di Torino and INFN
- L. Stanco
- INFN Padova
- N. Stefaniuk
- Deutsches Elektronen-Synchrotron DESY
- B. Surrow
- Department of Physics, Temple University
- K. Tokushuku
- Institute of Particle and Nuclear Studies, KEK
- J. Tomaszewska
- Faculty of Physics, University of Warsaw
- A. Trofymov
- Department of Nuclear Physics, National Taras Shevchenko University of Kyiv
- O. Turkot
- Deutsches Elektronen-Synchrotron DESY
- T. Tymieniecka
- National Centre for Nuclear Research
- A. Verbytskyi
- Max-Planck-Institut für Physik
- W. A. T. Wan Abdullah
- National Centre for Particle Physics, Universiti Malaya
- K. Wichmann
- Deutsches Elektronen-Synchrotron DESY
- M. Wing
- Physics and Astronomy Department, University College London
- S. Yamada
- Institute of Particle and Nuclear Studies, KEK
- Y. Yamazaki
- Department of Physics, Kobe University
- A. F. Żarnecki
- Faculty of Physics, University of Warsaw
- O. Zenaiev
- Deutsches Elektronen-Synchrotron DESY
- DOI
- https://doi.org/10.1007/JHEP12(2022)164
- Journal volume & issue
-
Vol. 2022,
no. 12
pp. 1 – 27
Abstract
Abstract The exclusive photoproduction reactions γp → J/ψ(1S)p and γp → ψ(2S)p have been measured at an ep centre-of-mass energy of 318 GeV with the ZEUS detector at HERA using an integrated luminosity of 373 pb −1. The measurement was made in the kinematic range 30 < W < 180 GeV, Q 2 < 1 GeV2 and |t| < 1 GeV2, where W is the photon-proton centre-of-mass energy, Q 2 is the photon virtuality and t is the squared four-momentum transfer at the proton vertex. The decay channels used were J/ψ(1S) → μ + μ − , ψ(2S) → μ + μ − and ψ(2S) → J/ψ(1S)π + π − with subsequent decay J/ψ(1S) → μ + μ − . The ratio of the production cross sections, R = σ ψ(2S) /σ J/ψ(1S), has been measured as a function of W and |t| and compared to previous data in photoproduction and deep inelastic scattering and with predictions of QCD-inspired models of exclusive vector-meson production, which are in reasonable agreement with the data.
Keywords
