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Using an impact parameter tag to select an enriched sample of $Z \rightarrowb \overline{b}$ events, we have measured the difference between the averagecharged multiplicity of $Z \rightarrow b \overline{b}$ and $Z^0 \rightarrowhadrons$ to be $\overline{n}_{b} - \overline{n}_{had} = 2.24\pm0.30(\rm{stat.}) \pm 0.33(\rm{syst.})$ tracks per event. {}From this, we havederived $\overline{n}_{b} - \overline{n}_{uds} = 3.31 \pm 0.41 \pm 0.79.$Comparing this measurement with those at lower center-of-mass energies, we findno evidence that $\overline{n}_{b} - \overline{n}_{uds}$ depends on energy.This result is in agreement with a precise prediction of perturbative QCD, andsupports the notion that QCD remains asymptotically free down to the scale$M_b^2$.Comment: 15 pages (in Phyzzx) and two figures (uuencoded compressed EPS  files), Physical Review Letters Volume 72, 3145 (May 1994), SLAC preprint  SLAC-PUB-6372 (as revised for Physical Review Letters

physical review letters

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Measurement of the charged multiplicity ofZ0→bb¯ events