A study of charm hadron production in\(Z^0 \to c\bar c\) and\(Z^0 \to b\bar b\) decays at LEPdecays at LEP

Measurements of the production of the weakly decaying charmed hadrons: D0, D+, D s + andΛ c + in both\(Z^0 \to c\bar c\) and\(Z^0 \to b\bar b\) events are reported. By summing the partial contributions from each of these states we measure the partial width for Z0 decays into a\(c\bar c\) pair as: $$\frac{{\Gamma _{c\bar c} }}{{\Gamma _{had} }} = 0.167 \pm 0.011(stat) \pm 0.011(sys) \pm 0.005(br)$$ where the errors are statistical, systematic and due to the uncertainties in the charmed hadron branching ratios, respectively. The relative production rates for the formation of the charmed hadrons from primaryc quarks is found to be in good agreement with continuum e + e − data at √s≈10 GeV.