Measurement of charm fragmentation fractions in photoproduction at HERA
Abstract
The production of D0, D*+, D+, Ds+ and Lambdac+ charm hadrons and their antiparticles in ep scattering at HERA has been studied with the ZEUS detector, using a total integrated luminosity of 372 pb-1. The fractions of charm quarks hadronising into a particular charm hadron were derived. In addition, the ratio of neutral to charged D-meson production rates, the fraction of charged D mesons produced in a vector state, and the stangeness-suppression factor have been determined. The measurements have been performed in the photoproduction regime. The charm hadrons were reconstructed in the range of transverse momentum pT >3.8 GeV and pseudorapidity |eta|<1.6. The charm fragmentation fractions are compared to previous results from HERA and from e+e-experiments. The data support the hypothesis that fragmentation is independent of the production process.
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