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Measurement of the cross-section ratio σψ(2S)/σJ/ψ(1S) in exclusive photoproduction at HERA

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, Q2 < 1 GeV2 and |t|...

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Main Authors: Abt, Iris (Author) , Adamus, M. (Author) , Aggarwal, R. (Author) , Aushev, V. (Author) , Behnke, O. (Author) , Bertolin, A. (Author) , Bloch, I. (Author) , Brock, I. (Author) , Brook, N. H. (Author) , Brugnera, R. (Author) , Bruni, A. (Author) , Bussey, P. J. (Author) , Caldwell, A. (Author) , Catterall, C. D. (Author) , Chwastowski, J. (Author) , Ciborowski, J. (Author) , Ciesielski, R. (Author) , Cooper-Sarkar, A. M. (Author) , Corradi, M. (Author) , Dementiev, R. K. (Author) , Dusini, S. (Author) , Ferrando, J. (Author) , Foster, B. (Author) , Gallo, E. (Author) , Gangadharan, Dhevan (Author) , Garfagnini, A. (Author) , Geiser, A. (Author) , Grzelak, G. (Author) , Gwenlan, C. (Author) , Hochman, D. (Author) , Jomhari, N. Z. (Author) , Kadenko, I. (Author) , Karshon, U. (Author) , Kaur, P. (Author) , Klanner, R. (Author) , Klein, U. (Author) , Korzhavina, I. A. (Author) , Kovalchuk, N. (Author) , Kuze, M. (Author) , Levchenko, B. B. (Author) , Levy, A. (Author) , Löhr, B. (Author) , Lohrmann, E. (Author) , Longhin, A. (Author) , Lorkowski, F. (Author) , Makarenko, I. (Author) , Malka, J. (Author) , Masciocchi, S. (Author) , Nagano, K. (Author) , Nam, J. D. (Author) , Onishchuk, Yu. (Author) , Paul, E. (Author) , Pidhurskyi, I. (Author) , Polini, A. (Author) , Przybycień, M. (Author) , Quintero, A. (Author) , Rubinsky, I. (Author) , Ruspa, M. (Author) , Schneekloth, U. (Author) , Schörner-Sadenius, T. (Author) , Selyuzhenkov, I. (Author) , Shchedrolosiev, M. (Author) , Shcheglova, L. M. (Author) , Skillicorn, I. O. (Author) , Słomiński, W. (Author) , Solano, A. (Author) , Stanco, L. (Author) , Stefaniuk, N. (Author) , Surrow, B. (Author) , Tokushuku, K. (Author) , Tomaszewska, J. (Author) , Trofymov, A. (Author) , Turkot, O. (Author) , Tymieniecka, T. (Author) , Verbytskyi, A. (Author) , Wan Abdullah, W. A. T. (Author) , Wichmann, K. (Author) , Wing, M. (Author) , Yamada, S. (Author) , Yamazaki, Y. (Author) , Żarnecki, A. F. (Author) , Zenaiev, O. (Author)
Format: Article (Journal)
Language:English
Published: December 29, 2022
In: Journal of high energy physics
Year: 2022, Issue: 12, Pages: 1-27
ISSN:1029-8479
DOI:10.1007/JHEP12(2022)164
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1007/JHEP12(2022)164
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Author Notes:The ZEUS collaboration
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Summary: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, Q2 < 1 GeV2 and |t| < 1 GeV2, where W is the photon-proton centre-of-mass energy, Q2 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 = σψ(2S)/σJ/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.
Item Description:Im Titel sind die Formulierungen "psi(2S)" und "J/psi(1S)" tiefgestellt
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
Gesehen am 26.04.2023
Physical Description:Online Resource
ISSN:1029-8479
DOI:10.1007/JHEP12(2022)164

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