Using an impact parameter tag to select an enriched sample of Z0 --> bbBAR events, we have measured the difference between the average charged multiplicity of Z0 --> bbBAR and Z0 --> hadrons to be n(b)BAR-n(had)BAR=2.24 +/- 0.30(stat) +/- 0.33(syst) tracks per event. From this, we have derived n(b)BAR-n(uds)BAR=3.31 +/- 0.41 +/- 0.79. Comparing this measurement with those at lower center-of-mass energies, we find no evidence that n(b)BAR-n(uds)BAR 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.
Measurement of the Charged Multiplicity of Z(0)-]b(b)over-bar Events
BISELLO, DARIO;
1994
Abstract
Using an impact parameter tag to select an enriched sample of Z0 --> bbBAR events, we have measured the difference between the average charged multiplicity of Z0 --> bbBAR and Z0 --> hadrons to be n(b)BAR-n(had)BAR=2.24 +/- 0.30(stat) +/- 0.33(syst) tracks per event. From this, we have derived n(b)BAR-n(uds)BAR=3.31 +/- 0.41 +/- 0.79. Comparing this measurement with those at lower center-of-mass energies, we find no evidence that n(b)BAR-n(uds)BAR 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.File in questo prodotto:
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