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, KHAKZAD, M and SCHMIDKE, W B (1995) Measurement of the cross-section for the reaction gamme-P-]J/PSI-P with the ZEUS detector at HERA. Physics Letters B, 350 (1).
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This paper reports the cross section measurements for the process ep --> e J/psi p for Q(2) < 4 GeV2 at root s = 296 GeV, based on an integrated luminosity of about 0.5 pb(-1), using the ZEUS detector. The J/psi was detected in its e(+)e(-) and mu(+)mu(-) decay modes. The photoproduction cross section was measured to be 52(-12)(+7) +/- 10 nb at an average gamma p centre of mass energy of 67 GeV and 71(-20)(+13) +/- 12 nb at 114 GeV. The significant rise of the cross section compared to lower energy measurements is not in agreement with VDM models, but can be described by QCD inspired models if a rise in the gluon momentum density at low x in the proton is assumed.
This is a Submitted version This version's date is: 4/5/1995 This item is not peer reviewed
https://repository.royalholloway.ac.uk/items/efe92ea9-9896-c8e7-6f03-30c0a4d10d5b/4/
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