Abstract
We re-analyze Tavatron data on charmonium hadroproduction in the framework of the color-octet model implemented in the event generator PYTHIA taking into account initial-state radiation of gluons and Altarelli-Parisi evolution of final-stage gluons fragmenting into c c pairs. We obtain new values for the color-octet matrix elements relevant to this production process. We discuss the sensitivity of our results to the transverse momentum lower cut-off employed in the generation to avois the problematic p t →0 region, arguing to the transverse momentum our previous extraction of the NRQCD matrix elements for the 3S 1 (8) and 1S 0 (8) + 3P J (8) contributions. Finally we extrapolate to LHC energies to get predictions on the J ψ direct production rate.
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