Abstract

It is shown that existing difficulties in the perturbative QCD approach to the data for hadronic production of charm are eliminated once the flavour excitation contribution is duly taken into account. A stable calculation of this contribution is presented whose main ingredients are: i) a QCD Monte Carlo calculation of the evolution of the charm sea, with constraints from the existing F2(charm) data; ii) use of pT data for charmed mesons to fix the tmin cutoff which regulates the t≂0 divergence in the diagrams. Diffractive production of Λc is shown to be naturally understood with a simple recombination model. Qualitative predictions for bottom production are also discussed.

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