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Abt, I.; Adamus, M.; Aggarwal, R.; Aushev, V.; Behnke, O.; Bertolin, A.; Bloch, I.; Brock, I.; Brook, N. H.; Brugnera, R.; Bruni, A.; Bussey, P. J.; Caldwell, A.; Catterall, C. D.; Chwastowski, J.; Ciborowski, J.; Ciesielski, R.; Cooper-Sarkar, A. M.; Corradi, M.; Dementiev, R. K.; Dusini, S.; Ferrando, J.; Foster, B.; Gallo, E.; Gangadharan, D.; Garfagnini, A.; Geiser, A.; Grzelak, G.; Gwenlan, C.; Hochman, D.; Jomhari, N. Z.; Kadenko, I.; Karshon, U.; Kaur, P.; Klanner, R.; Klein, U.; Korzhavina, I. A.; Kovalchuk, N.; Kuze, M.; Levchenko, B. B.; Levy, A.; Löhr, B.; Lohrmann, E.; Longhin, A.; Lorkowski, F.; Makarenko, I.; Malka, J.; Masciocchi, S.; Nagano, K.; Nam, J. D.; Onishchuk, Yu; Paul, E.; Pidhurskyi, I.; Polini, A.; Przybycień, M.; Quintero, A.; Rubinsky, I.; Ruspa, M.; Schneekloth, U.; Schörner-Sadenius, T.; Selyuzhenkov, I.; Shchedrolosiev, M.; Shcheglova, L. M.; Skillicorn, I. O.; Słomiński, W.; Solano, A.; Stanco, L.; Stefaniuk, N.; Surrow, B.; Tokushuku, K.; Tomaszewska, J.; Trofymov, A.; Turkot, O.; Tymieniecka, T.; Verbytskyi, A.; Wan Abdullah, W. A. T.; Wichmann, K.; Wing, M.; Yamada, S.; Yamazaki, Y.; Żarnecki, A. F.; Zenaiev, O.
The journal of high energy physics, 29/12, Letnik: 2022, Številka: 12Journal Article
A bstract The exclusive photoproduction reactions γp → J/ψ (1 S ) p and γp → ψ (2 S ) 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 GeV 2 and | t | < 1 GeV 2 , 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 (1 S ) → μ + μ − , ψ (2 S ) → μ + μ − and ψ (2 S ) → J/ψ (1 S ) π + π − with subsequent decay J/ψ (1 S ) → μ + μ − . The ratio of the production cross sections, R = σ ψ (2 S ) /σ J/ψ (1 S ) , 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.
