Measurement of the Charged Multiplicity of $Z \rightarrow b \overline{b}$ Events

Details Measurement of the Charged Multiplicity of $Z \rightarrow b \overline{b}$ Events Measurement of the Charged Multiplicity of $Z \rightarrow b \overline{b}$ Events

1994-05-13

arxiv.org/abs/hep-ex/9405004v1

Phys.Rev.Lett.72:3145-3149,1994

Physics

High Energy Physics

High Energy Physics - Experiment

15 pages (in Phyzzx) and two figures (uuencoded compressed EPS files), Physical Review Letters Volume 72, 3145 (May 1994), SLA

Scientific paper

10.1103/PhysRevLett.72.3145

Using an impact parameter tag to select an enriched sample of $Z \rightarrow b \overline{b}$ events, we have measured the difference between the average charged multiplicity of $Z \rightarrow b \overline{b}$ and $Z^0 \rightarrow hadrons$ to be $\overline{n}_{b} - \overline{n}_{had} = 2.24\pm 0.30(\rm{stat.}) \pm 0.33(\rm{syst.})$ tracks per event. {}From this, we have derived $\overline{n}_{b} - \overline{n}_{uds} = 3.31 \pm 0.41 \pm 0.79.$ Comparing this measurement with those at lower center-of-mass energies, we find no evidence that $\overline{n}_{b} - \overline{n}_{uds}$ depends on energy. This result is in agreement with a precise prediction of perturbative QCD, and supports the notion that QCD remains asymptotically free down to the scale $M_b^2$.

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