Inelastic J/Ψ Photoproduction off Nuclei: Gluon Enhancement or Double Color Exchange?
J. Huefner, B. Z. Kopeliovich, Al. B. Zamolodchikov
Abstract
The nuclear enhancement observed in inelastic photoproduction of J/Ψ should not be interpreted as evidence for an increased gluon density in nuclei. The nuclear suppression of the production rate due to initial and final state interactions is calculated and a novel two-step color exchange process is proposed, which is able to explain the data.
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