Measurement of the cross-section ratio σψ(2S)/σJ/ψ(1S) in deep inelastic exclusive ep scattering at HERA
oleh: 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, P. Roloff, I. Rubinsky, M. Ruspa, D.H. Saxon, M. Schioppa, W.B. Schmidke, U. Schneekloth, T. Schörner-Sadenius, L.M. Shcheglova, R. Shevchenko, O. Shkola, Yu. Shyrma, I. Singh, I.O. Skillicorn, W. Słomiński, A. Solano, L. Stanco, N. Stefaniuk, A. Stern, P. Stopa, J. Sztuk-Dambietz, D. Szuba, J. Szuba, E. Tassi, K. Tokushuku, J. Tomaszewska, A. Trofymov, T. Tsurugai, M. Turcato, O. Turkot, T. Tymieniecka, A. Verbytskyi, O. Viazlo, R. Walczak, W.A.T. Wan Abdullah, K. Wichmann, M. Wing, G. Wolf, S. Yamada, Y. Yamazaki, N. Zakharchuk, A.F. Żarnecki, L. Zawiejski, O. Zenaiev, B.O. Zhautykov, N. Zhmak, D.S. Zotkin
| Format: | Article |
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| Diterbitkan: | Elsevier 2016-08-01 |
Deskripsi
The exclusive deep inelastic electroproduction of ψ(2S) and J/ψ(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<Q2<80 GeV2, 30<W<210 GeV and |t|<1 GeV2, where Q2 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<Q2<5 GeV2 were taken in the HERA I running period and correspond to an integrated luminosity of 114 pb−1. The data for 5<Q2<80 GeV2 are from both HERA I and HERA II periods and correspond to an integrated luminosity of 468 pb−1. The decay modes analysed were μ+μ− and J/ψ(1S)π+π− for the ψ(2S) and μ+μ− for the J/ψ(1S). The cross-section ratio σψ(2S)/σJ/ψ(1S) has been measured as a function of Q2,W and t. The results are compared to predictions of QCD-inspired models of exclusive vector-meson production.