$J/ψ$ Photoproduction and the Gluon Structure of the Nucleon

Using short distance QCD methods based on the operator product expansion, we calculate the $J/ψ$ photoproduction cross section in terms of the gluon distribution function of the nucleon. Comparing the result with data, we show that experimental behaviour of the cross section correctly reflects the $x$-dependence of the gluon distribution obtained from deep inelastic scattering.

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