2003/01/27 by A. Sibirtsev, Sibirtsev, A., S. Krewald +3
Biochemistry, Genetics and Molecular Biology · Physics and Astronomy · #Eicosanoids and Hypertension Pharmacology #FOS: Physical sciences #Nuclear Theory (nucl-th) #nucl-th
paper · pdf · doi:10.48550/arxiv.nucl-th/0301082
11 pages, 11 figures, revtex4
arxiv created 2003/01/27 · openalex publication_date 2003/01/27 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The available data on J/Ψ photoproduction are analyzed in terms of pomeron exchange, two gluon exchange and photon-gluon fusion models. Allowing the pomeron-quark interaction to be flavour dependent and introducing the soft and hard pomerons it is possible to reproduce the data at √(s)>10 GeV and small |t|. The two gluon exchange calculations indicate strong sensitivity to the gluon distribution function. The results obtained with the most modern MRST2001 and DL PDF reproduce the forward J/Ψ photoproduction cross section at √(s)>10 GeV. The calculations with the photon-gluon fusion model and with MRST2001 and DL PDF are also in reasonable agreement with the data on the total J/Ψ photoproduction cross section. We allocate the J/Ψ photoproduction at low energies and large |t| to the mechanism different from pomeron or two gluon exchanges. We consider that this might be axial vector trajectory exchange that couples to the axial form factor of the nucleon.