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  • Measurement of the cross-section ratio sigma_{psi(2S)}/sigma_{J/psi(1S)} in deep inelastic exclusive ep scattering at HERA
    Abt, I; Adamczyk, L; Adamus, M; Aushev, V; Aushev, Y; Behnke, O; Bertolin, A; Borras, K; Brock, I; Brook, N H; Brugnera, R; Bussey, P J; Caldwell, A; Catterall, C D; Ciesielski, R; Cooper-Sarkar, A M; Corradi, M; Corriveau, F; Dementiev, R K; Dolinska, G; Dusini, S; Gallo, E; Garfagnini, A; Gladilin, L K; Grebenyuk, J; Gregor, I; Grzelak, G; Gueta, O; Hain, W; Hori, R; Ibrahim, Z A; Iga, Y; Iudin, A; Januschek, F; Karshon, U; Kaur, P; Kisielewska, D; Kondrashova, N; Kononenko, O; Korol, Ie; Korzhavina, I A; Kötz, U; Kovalchuk, N; Kowalski, H; Krupa, B; Kuze, M; Levchenko, B B; Levy, A; Lisovyi, M; Löhr, B; Lohrmann, E; Longhin, A; Lontkovskyi, D; O Yu Lukina; Makarenko, I; Malka, J; Mergelmeyer, S; N Mohammad Nasir; Myronenko, V; Nobe, T; Notz, D; Nowak, R J; Yu Onishchuk; Perlański, W; Pokrovskiy, N S; Przybycień, M; Roloff, P; Ruspa, M; Saxon, D H; Schmidke, W B; Schneekloth, U; Shcheglova, L M; Shevchenko, R; Yu Shyrma; Skillicorn, I O; Słomiński, W; Stefaniuk, N; Stern, A; Stopa, P; Sztuk-Dambietz, J; Szuba, D; Tassi, E; Tokushuku, K; Tsurugai, T; Turcato, M; Turkot, O; Verbytskyi, A; Viazlo, O; Walczak, R; W A T Wan Abdullah; Wolf, G; Yamada, S; Yamazaki, Y; Zakharchuk, N; Żarnecki, A F; Zawiejski, L; Zenaiev, O; Zhautykov, B O; Zhmak, N; Zotkin, D S

    arXiv.org, 06/2016
    Paper, Journal Article

    The exclusive deep inelastic electroproduction of \(\psi(2S)\) and \(J/\psi(1S)\) at an \(ep\) centre-of-mass energy of 317 GeV has been studied with the ZEUS detector at HERA in the kinematic range \(2 < Q^2 < 80\) GeV\(^2\), \(30 < W < 210\) GeV and \(|t| < 1\) GeV\(^2\), where \(Q^2\) is the photon virtuality, \(W\) is the photon-proton centre-of-mass energy and \(t\) is the squared four-momentum transfer at the proton vertex. The data for \(2 < Q^2 < 5\) GeV\(^2\) were taken in the HERA I running period and correspond to an integrated luminosity of 114 pb\(^{-1}\). The data for \(5 < Q^2 < 80\) GeV\(^2\) are from both HERA I and HERA II periods and correspond to an integrated luminosity of 468 pb\(^{-1}\). The decay modes analysed were \(\mu^+\mu^-\) and \(J/\psi(1S) \pi^+\pi^-\) for the \(\psi(2S)\) and \(\mu^+\mu^-\) for the \(J/\psi(1S)\). The cross-section ratio \(\sigma_{\psi(2S)}/\sigma_{J/\psi(1S)}\) has been measured as a function of \(Q^2, W\) and \(t\). The results are compared to predictions of QCD-inspired models of exclusive vector-meson production.

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