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- W2034008256 abstract "A model describing photoproduction of a heavy-fermion pair which interacts by the exchange of gluons with the target is considered in the framework of the Cheng-Wu picture. Its characteristics are presented and it is applied to psi/sub c/ and eta/sub c/ photoproduction where the heavy quarks are assumed to be produced in the target's gluon potential. The angular distribution of orthocharmonium reveals a characteristic zero point at ..sqrt.. - t = 2m/sub c/ whereas the angular distribution of paracharmonium is flat. Arguments and estimates are given for the neglect of the gluon tree diagrams. The model applied to electromagnetic production of (tau/sup +/tau/sup -/) shows that the inclusion of multiphoton exchanges enhances the cross sections by a factor 2--3." @default.
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- W2034008256 date "1978-06-01" @default.
- W2034008256 modified "2023-09-23" @default.
- W2034008256 title "Photoproduction of charmonium in a gluon-exchange model" @default.
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- W2034008256 doi "https://doi.org/10.1103/physrevd.17.2955" @default.
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