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- W2080964080 abstract "The available data on J/Ψ photoproduction are analysed in terms of pomeron exchange, two-gluon exchange and photon–gluon fusion models. Allowing the pomeron–quark interaction to be flavour-dependent and introducing both soft and hard pomerons it is possible to reproduce the data at 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 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. However none of the models describe the data at GeV or |t| ⩾ 1 GeV2. We attribute the J/Ψ photoproduction at low energies and large |t| to a mechanism different from pomeron or two-gluon exchange. We consider that this might be the exchange of an axial vector trajectory that couples with the axial form factor of the nucleon." @default.
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- W2080964080 date "2004-09-16" @default.
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- W2080964080 title "Systematic analysis of charmonium photoproduction" @default.
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- W2080964080 doi "https://doi.org/10.1088/0954-3899/30/10/009" @default.
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