D^* production from e^+e^- to ep collisions in NLO QCD

Details D^* production from e^+e^- to ep collisions in NLO QCD D^* production from e^+e^- to ep collisions in NLO QCD

1997-02-21

arxiv.org/abs/hep-ph/9702389v1

Phys.Rev. D55 (1997) 7134-7143

Physics

High Energy Physics

High Energy Physics - Phenomenology

20 pages, LaTeX2e, 8 Postscript figures

Scientific paper

10.1103/PhysRevD.55.7134

Fragmentation functions 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 epsilon parameter sensibly different from the one commonly used, which is instead found with a leading order fit. The use of this new value is shown to increase considerably the cross section for D^* production at HERA, suggesting a possible reconciliation between the next-to-leading order theoretical predictions and the experimental data.

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