Charmonia production in hadron colliders and the extraction of colour-octet matrix elements

Abstract

We present the results of our analysis on charmonia ($J/\psi$ and ${\psi }^{\prime }$) hadroproduction taking into account higher-order QCD effects induced by initial-state radiation in a Monte Carlo framework, with the colour-octet mechanism implemented in the event generation. We find that those colour-octet matrix elements extracted so far from Fermilab Tevatron data for both $J/\psi$ and ${\psi }^{\prime }$ production have to be lowered significantly. We finally make predictions for charmonia production at the LHC, presenting a code for a fast simulation with PYTHIA based on the colour-octet model.

17 pages, LaTex, 5 Figures included in the text

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