Colour-octet Contributions to J/psi Hadroproduction at Fixed Target Energies

Abstract

We investigate the integrated cross section for forward $\jpsi$ production in proton-proton and pion-proton collisions at centre of mass energies upto 60 GeV. We find that colour-octet contributions to the cross section are crucially important, and their inclusion produces a very good description of the data. Since the values of non-perturbative matrix elements are fixed by other experiments, these predictions are parameter-free.

7 pages vanilla LaTeX including one figure. Errors in eqs 3, 6, 8 corrected and other minor changes

References in corpus (7)

• Color-octet quarkonia production
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• Color-octet quarkonia production II
• Color-Octet Contributions to $J/\psi$ Photoproduction
• Charmonium Production at the Tevatron
• An update on ${\chi }_c$ Decays: Perturbative QCD versus Data
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