Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-07-26
Nucl.Phys.Proc.Suppl. 86 (2000) 543-546
Physics
High Energy Physics
High Energy Physics - Phenomenology
Latex, espcrc2, 4 pages, 3 EPS figures, Montpellier QCD99 Conference. to appear in Nucl. Phys. B [Proc. Suppl.]
Scientific paper
10.1016/S0920-5632(00)00620-4
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-state gluons fragmenting into $c\bar{c}$ 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 avoid the problematic $p_t{\to}0$ region, arguing about the reliability of 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 $J/\psi$ direct production rate.
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