Abstract
The charged-particle multiplicity is measured for b-quark and light-quark ( u, d, s) events in e + e − annihilation at s =58 GeV. Two independent methods, lepton tagging and decay-length tagging, are applied to enrich b-quark events. These methods provide event samples having different concentrations of b-quark events. The mean charged multiplicity is measured to be 19.38±0.27±0.84 for b-quark events, and 15.91±0.04±0.70 for light-quark events. The results are compared with predictions of phenomenological and theoretical models.
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