Measurement of the charged multiplicity of events containing bottom hadrons atEc.m.=91GeV
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Abstract
Using an impact-parameter tag to select an enriched sample of ${Z}^{0}\ensuremath{\rightarrow}b\overline{b}$ events, we have measured the difference between the average charged multiplicity of $b\overline{b}$ and all hadronic ${Z}^{0}$ decays to be 2.1\ifmmode\pm\else\textpm\fi{}1.8(stat)\ifmmode\pm\else\textpm\fi{}0.6(syst) tracks per event. The resulting total (nonleading) charged multiplicity for ${Z}^{0}\ensuremath{\rightarrow}b\overline{b}$ events is 23.1(12.0)\ifmmode\pm\else\textpm\fi{}1.8\ifmmode\pm\else\textpm\fi{}0.6 tracks. A comparison of this nonleading multiplicity to hadronic multiplicity data in the range of 10 to 60 GeV supports the hypothesis of flavor-independent hadronic fragmentation, and yields a measurement of the average energy fraction of bottom hadrons in ${Z}^{0}$ decays of ${〈{x}_{E}〉}_{b}=0.62\ifmmode\pm\else\textpm\fi{}0.10\ifmmode\pm\else\textpm\fi{}0.04$.