On the duality of Drell-Yan and J/ψ production processes

The model on J/ψ production allowing the extraction of parton distribution functions is studied from the combined analysis with both data on Drell-Yan and J/ψ production processes. It is shown that this model, attractive from a theoretical point of view, can be safely used in the low-energy region E ≲ 100 GeV. The significance of gluon contributions to the J/ψ cross sections is investigated. The obtained results in the high-energy region are rather surprising.