Abstract
The cross sections for inelastic photoproduction of J/ψ and ψ′ mesons have been measured in ep collisions with the ZEUS detector at HERA, using an integrated luminosity of 468 pb−1 collected in the period 1996–2007. The ψ′ to J/ψ cross section ratio was measured in the range 0.55 < z < 0.9 and 60 < W < 190 GeV as a function of W, z and p T . Here W denotes the photon-proton centre-of-mass energy, z is the fraction of the incident photon energy carried by the meson and p T is the transverse momentum of the meson with respect to the beam axis. The J/ψ cross sections were measured for 0.1 < z < 0.9, 60 < W < 240 GeV and p T > 1 GeV. Theoretical predictions within the non-relativistic QCD framework including NLO colour-singlet and colour-octet contributions were compared to the data, as were predictions based on the k T -factorisation approach.
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ArXiv ePrint: 1211.6946
Supported by the US Department of Energy. (1, 37, 56)
Supported by the Italian National Institute for Nuclear Physics (INFN). (3, 4, 8, 17, 18, 39, 40, 43, 49, 50)
Supported by the German Federal Ministry for Education and Research (BMBF), under contract No. 05 H09PDF. (5)
Supported by the Science and Technology Facilities Council, U.K. (6, 20, 23, 38, 44, 52)
Supported by HIR and UMRG grants from Universiti Malaya, and an ERGS grant from the Malaysian Ministry for Higher Education. (10)
Supported by the US National Science Foundation. Any opinion, findings and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the National Science Foundation. (11, 41)
Supported by the Polish Ministry of Science and Higher Education as a scientific project No. DPN/N188/DESY/2009. (12)
Supported by the Polish Ministry of Science and Higher Education and its grants for Scientific Research. (13)
Supported by the German Federal Ministry for Education and Research (BMBF), under contract No. 05h09GUF, and the SFB 676 of the Deutsche Forschungsgemeinschaft (DFG). (22)
Supported by the Japanese Ministry of Education, Culture, Sports, Science and Technology (MEXT) and its grants for Scientific Research. (24, 32, 42, 46, 47, 48)
Supported by the Korean Ministry of Education and Korea Science and Engineering Foundation. (28)
Supported by FNRS and its associated funds (IISN and FRIA) and by an Inter-University Attraction Poles Programme subsidised by the Belgian Federal Science Policy Office. (29)
Supported by the Spanish Ministry of Education and Science through funds provided by CICYT. (30)
Supported by the Natural Sciences and Engineering Research Council of Canada (NSERC). (31, 51, 57)
Partially supported by the German Federal Ministry for Education and Research (BMBF). (33)
Supported by RF Presidential grant N 3920.2012.2 for the Leading Scientific Schools and by the Russian Ministry of Education and Science through its grant for Scientific Research on High Energy Physics. (34)
Supported by the Netherlands Foundation for Research on Matter (FOM). (36)
Supported by the Israel Science Foundation. (45)
Also funded by Max Planck Institute for Physics, Munich, Germany. (R. Aggarwal, P. Kaur, I. Singh)
Also Senior Alexander von Humboldt Research Fellow at Hamburg University, Institute of Experimental Physics, Hamburg, Germany. (E. Tassi)
Supported by the research grant No. 1 P03B 04529 (2005-2008). (A. Kotanski)
Partially supported by the Polish National Science Centre projects DEC-2011/01/B/ST2/03643 and DEC-2011/03/B/ST2/00220. (W. Slominski)
Now at DESY group FS-CFEL-1. (N. Coppola)
Also affiliated with Universtiy College London, U.K. (K. Mujkic)
Partially supported by Warsaw University, Poland. (J. Tomaszewska)
Supported by the Alexander von Humboldt Foundation. (K. Wichmann)
Also affiliated with DESY, Germany. (I. Gialas)
Deceased. (B. A. Dolgoshein, P. F. Ermolov, A. Eskreys)
Supported by DESY, Germany. (V. Aushev, Y. Aushev, V. Bokhonov, N. Zhmak)
Member of National Technical University of Ukraine, Kyiv Polytechnic Institute, Kyiv, Ukraine. (Y. Aushev)
Member of National University of Kyiv - Mohyla Academy, Kyiv, Ukraine. (A. Gizhko, N. Kondrashova, O. Turkot, O. Zabiegalov)
Alexander von Humboldt Professor; also at DESY and University of Oxford. (B. Foster)
STFC Advanced Fellow. (C. Gwenlan)
This material was based on work supported by the National Science Foundation, while working at the Foundation. (J. J. Whitmore)
Also at Max Planck Institute for Physics, Munich, Germany, External Scientific Member. (H. Abramowicz)
Member of Lódz University, Poland. (W. Perlanski)
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The ZEUS collaboration., Abramowicz, H., Abt, I. et al. Measurement of inelastic J/ψ and ψ′ photoproduction at HERA. J. High Energ. Phys. 2013, 71 (2013). https://doi.org/10.1007/JHEP02(2013)071
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DOI: https://doi.org/10.1007/JHEP02(2013)071