Colour-octet Contributions to J/psi Hadroproduction at Fixed Target Energies
Sourendu Gupta, K. Sridhar
Abstract
We investigate the integrated cross section for forward 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.
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