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Phys. Rev. Lett. 72, 3145 - 3149 (1994)

Measurement of the charged multiplicity of Z0→bb¯ events

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K. Abe et al.
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Received 5 November 1993

Using an impact parameter tag to select an enriched sample of Z0→bb¯ events, we have measured the difference between the average charged multiplicity of Z0→bb¯ and Z0→ hadrons to be n¯b-n¯had=2.24±0.30 ( stat )±0.33 ( syst ) tracks per event. From this, we have derived n¯b-n¯uds=3.31±0.41±0.79. Comparing this measurement with those at lower center-of-mass energies, we find no evidence that n¯b-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 Mb2.


©1994 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.72.3145
DOI: 10.1103/PhysRevLett.72.3145
PACS: 13.38.Dg, 12.38.Qk, 13.65.+i, 13.87.Fh

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