Soft and hard QCD dynamics in hadroproduction of charmonium

Details Soft and hard QCD dynamics in hadroproduction of charmonium Soft and hard QCD dynamics in hadroproduction of charmonium

2001-11-28

arxiv.org/abs/hep-ph/0111379v1

Eur.Phys.J.C23:527-538,2002

Physics

High Energy Physics

High Energy Physics - Phenomenology

21 pages, 13 eps figures

Scientific paper

10.1007/s100520100881

Both hard and soft QCD dynamics are important in charmonium production, as presented here through a next-to-leading order QCD matrix element calculation combined with the colour evaporation model. Observed $x_F$ and $p_\perp$ distributions of $J/\psi$ in hadroproduction at fixed target and $p\bar{p}$ collider energies are reproduced. Quite similar results can also be obtained in a more phenomenologically useful Monte Carlo event generator where the perturbative production of \ccbar pairs is instead obtained through leading order matrix elements and the parton shower approximation of the higher order processes. The soft dynamics may alternatively be described by the soft colour interaction model, originally introduced in connection with rapidity gaps. We also discuss the relative rates of different charmonium states and introduce an improved model for mapping the continuous \ccbar mass spectrum on the physical charmonium resonances.

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