arXiv:hep-ph/0304114·v2·High Energy Physics — Phenomenology
Direct J/psi and psi' hadroproduction via fragmentation in the collinear parton model and k_T-factorization approach
V. A. Saleev🇷🇺 · D. V. Vasin (Samara State University, Samara, Russia)🇷🇺
Abstract
The p_T-spectra for direct J/psi and psi' in hadroproduction at Tevatron energy have been calculated based on NRQCD formalism and fragmentation approximation in the collinear parton model and k_T-factorization approach. We have described the CDF data and obtained a good agreement between the predictions obtained in the parton model and k_T-factorization approach. We performed the calculations using the relevant leading order in alpha_s hard amplitudes and the equal values of the color-octet long-distance matrix elements for the both models.
Comments: 10 pages, Latex, 4 eps figures, epsfig.sty, graphics.sty