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arXiv · 1601.03699

Measurement of the cross-section ratio sigma_{psi(2S)}/sigma_{J/psi(1S)} in deep inelastic exclusive ep scattering at HERA

ZEUS Collaboration·H. Abramowicz·I. Abt·L. Adamczyk·M. Adamus·S. Antonelli·V. Aushev·Y. Aushev·O. Behnke·U. Behrens·A. Bertolin·I. Bloch·E. G. Boos·K. Borras·I. Brock·N. H. Brook·R. Brugnera·A. Bruni·P. J. Bussey·A. Caldwell·M. Capua·C. D. Catterall·J. Chwastowski·J. Ciborowski·R. Ciesielski·A. M. Cooper-Sarkar·M. Corradi·F. Corriveau·R. K. Dementiev·R. C. E. Devenish·G. Dolinska·S. Dusini·J. Figiel·B. Foster·G. Gach·E. Gallo·A. Garfagnini·A. Geiser·A. Gizhko·L. K. Gladilin·Yu. A. Golubkov·J. Grebenyuk·I. Gregor·G. Grzelak·O. Gueta·M. Guzik·W. Hain·D. Hochman·R. Hori·Z. A. Ibrahim·Y. Iga·M. Ishitsuka·A. Iudin·F. Januschek·N. Z. Jomhari·I. Kadenko·S. Kananov·U. Karshon·M. Kaur·P. Kaur·D. Kisielewska·R. Klanner·U. Klein·N. Kondrashova·O. Kononenko·Ie. Korol·I. A. Korzhavina·A. Kotański·U. Kötz·N. Kovalchuk·H. Kowalski·B. Krupa·O. Kuprash·M. Kuze·B. B. Levchenko·A. Levy·V. Libov·S. Limentani·M. Lisovyi·E. Lobodzinska·B. Löhr·E. Lohrmann·A. Longhin·D. Lontkovskyi·O. Yu. Lukina·I. Makarenko·J. Malka·S. Mergelmeyer·F. Mohamad Idris·N. Mohammad Nasir·V. Myronenko·K. Nagano·T. Nobe·D. Notz·R. J. Nowak·Yu. Onishchuk·E. Paul·W. Perlański·N. S. Pokrovskiy·M. Przybycień
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Abstract

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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ZEUS Collaboration, H. Abramowicz, I. Abt, L. Adamczyk, M. Adamus, S. Antonelli, V. Aushev, Y. Aushev, O. Behnke, U. Behrens, A. Bertolin, I. Bloch, E. G. Boos, K. Borras, I. Brock, N. H. Brook, R. Brugnera, A. Bruni, P. J. Bussey, A. Caldwell, M. Capua, C. D. Catterall, J. Chwastowski, J. Ciborowski, R. Ciesielski, A. M. Cooper-Sarkar, M. Corradi, F. Corriveau, R. K. Dementiev, R. C. E. Devenish, G. Dolinska, S. Dusini, J. Figiel, B. Foster, G. Gach, E. Gallo, A. Garfagnini, A. Geiser, A. Gizhko, L. K. Gladilin, Yu. A. Golubkov, J. Grebenyuk, I. Gregor, G. Grzelak, O. Gueta, M. Guzik, W. Hain, D. Hochman, R. Hori, Z. A. Ibrahim, Y. Iga, M. Ishitsuka, A. Iudin, F. Januschek, N. Z. Jomhari, I. Kadenko, S. Kananov, U. Karshon, M. Kaur, P. Kaur, D. Kisielewska, R. Klanner, U. Klein, N. Kondrashova, O. Kononenko, Ie. Korol, I. A. Korzhavina, A. Kotański, U. Kötz, N. Kovalchuk, H. Kowalski, B. Krupa, O. Kuprash, M. Kuze, B. B. Levchenko, A. Levy, V. Libov, S. Limentani, M. Lisovyi, E. Lobodzinska, B. Löhr, E. Lohrmann, A. Longhin, D. Lontkovskyi, O. Yu. Lukina, I. Makarenko, J. Malka, S. Mergelmeyer, F. Mohamad Idris, N. Mohammad Nasir, V. Myronenko, K. Nagano, T. Nobe, D. Notz, R. J. Nowak, Yu. Onishchuk, E. Paul, W. Perlański, N. S. Pokrovskiy, M. Przybycień. 2016-01-14. Measurement of the cross-section ratio sigma_{psi(2S)}/sigma_{J/psi(1S)} in deep inelastic exclusive ep scattering at HERA. https://arxiv.org/abs/1601.03699

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