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

摘要

The charged-particle multiplicity is measured for b-quark and light-quark (u, d, s) events in e(+)e(-) annihilation at root 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. (C) 1998 Published by Elsevier Science B.V. [References: 38]