Measurement of the charged multiplicity of bottom and light quark events in e+ e- annihilation at s**(1/2) = 58-GeV

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.

13.65.+i
12.38.Qk
13.87.Fh
Hadron production by electron-positron collisions
Strong interaction
Charged particle multiplicity
Fragmentation into hadrons
Bottom and light quarks
electron positron: colliding beams
electron positron: annihilation

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