Photoproduction of J/psi mesons at high energies in parton model and kₜ-faktorization approach

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We consider J/psi meson photoproduction on protons at high energies at the leading order in alphaₛ using conventional parton model and kₜ-factorization approach of QCD. It is shown that in the both cases the colour singlet mechanism gives correct description for experimental data from HERA for the total cross section and for the J/psi meson z-spectrum at realistic values of a c-quark mass and meson wave function at the origin Psi (0). At the same time our predictions for pₜ-spectrum of J/psi meson and for pₜ dependence of the spin parameter alpha obtained in kₜ-factorization approach are very different from the results obtained in conventional parton model. Such a way the experimental study of a polarized J/psi meson production at the large pₜ should be a direct test of BFKL gluons.