Charged particle multiplicity in three-jet events and two-gluon systems

The charged particle multiplicity in hadronic three-jet events from Z decays is investigated. The topology dependence of the event multiplicity is found to be well described by a modified leading logarithmic prediction. A parameter fit of the prediction to the data yields a measurement of the colour factor ratio C_A/C_F with the result

CA/CF = 2.261 ±0.014stat. ±0.036exp. ±0.066theo.C_A/C_F = 2.261 pm 0.014_{mathrm{stat.}} pm 0.036_{mathrm{exp.}} pm 0.066_{mathrm{theo.}}
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