Journal article
MEASUREMENT OF THE CROSS-SECTION FOR THE REACTION GAMMA-P-]J/PSI-P WITH THE ZEUS DETECTOR AT HERA
Physics letters. B, Vol.350(1), pp.120-134
05/04/1995
DOI: 10.1016/0370-2693(95)00403-8
Abstract
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.
Details
- Title: Subtitle
- MEASUREMENT OF THE CROSS-SECTION FOR THE REACTION GAMMA-P-]J/PSI-P WITH THE ZEUS DETECTOR AT HERA
- Creators
- ZEUS CollaborationJ Repond (Contributor)U Mallik (Contributor)E Mccliment (Contributor)
- Resource Type
- Journal article
- Publication Details
- Physics letters. B, Vol.350(1), pp.120-134
- Publisher
- Elsevier
- DOI
- 10.1016/0370-2693(95)00403-8
- ISSN
- 0370-2693
- eISSN
- 1873-2445
- Number of pages
- 15
- Language
- English
- Date published
- 05/04/1995
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984627187902771
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