Charmonium Production at High Energy in the k_T-Factorization Approach

Details Charmonium Production at High Energy in the k_T-Factorization Approach Charmonium Production at High Energy in the k_T-Factorization Approach

2006-02-20

arxiv.org/abs/hep-ph/0602179v1

Phys.Rev.D73:074022,2006

Physics

High Energy Physics

High Energy Physics - Phenomenology

40 pages, 10 figures

Scientific paper

10.1103/PhysRevD.73.074022

We study charmonium production at high-energy colliders (Tevatron, HERA, and LEP2) in the framework of the k_T-factorization approach and the factorization formalism of non-relativistic quantum chromodynamics at leading order in the strong-coupling constant alpha_s and the relative velocity v. The transverse-momentum distributions of direct and prompt J/psi-meson production measured at the Fermilab Tevatron are fitted to obtain the non-perturbative long-distance matrix elements for different choices of unintegrated gluon distribution functions in the proton. Using the matrix elements thus obtained, we predict charmonium production rates in gamma-gamma, gamma-p, and deep-inelastic e-p collisions including the contributions from both direct and resolved photons. The results are compared with the known ones obtained in the conventional parton model and with recent experimental data from HERA and LEP2.

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