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Analysis shows increased D production cross section in ep collisions, indicating reconciliation with theoretical predictions.
Fragmentation finctions for D mesons, based on the convolution of a perturbative part, related to the heavy quark perturbative showering, and a non-perturbative model for its hadronization into the meson, are used to describe D* production in e+e- and ep collisions. The non-perturbative part is determined by fitting the e+e- data taken by ARGUS and OPAL at 10.6 and 91.2 GeV respectively. When fitting with a non perturbative Peterson fragmentation function and using next-to-leading evolution for the perturbative part, we find an parameter significantly different from the one commonly used, wich is instead found with a leading order fit. The use of this new value is shown to increase considerably the cross section D* production at HERA, suggesting a possible reconciliation between the next-to-leading order theoretical predictions and the experimental data.
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M. et al. (1997) studied this question.
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