Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-01-05
Phys.Rev.D65:054041,2002
Physics
High Energy Physics
High Energy Physics - Phenomenology
LaTeX2e, 11 pages plus 8 fig. using epsfig.sty
Scientific paper
10.1103/PhysRevD.65.054041
We consider J/psi meson photoproduction on protons at high energies at the leading order in alpha_s using conventional parton model and k_t-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 p_t-spectrum of J/psi meson and for p_t dependence of the spin parameter alpha obtained in k_t-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 p_t should be a direct test of BFKL gluons.
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