## Abstract

The fraction of {Mathematical expression}; events in hadronic Z^{0} decays has been measured using the data collected by OPAL in 1992 and 1993. The presence of electrons or muons from semileptonic decays of bottom hadrons and the detection of bottom hadron decay vertices were used together to obtain an event sample enriched in {Mathematical expression} decays. To reduce the systematic error on the measurement of the {Mathematical expression} fraction, the efficiency of the {Mathematical expression} event tagging was obtained from the data by comparing the numbers of events having a bottom signature in either one or both thrust hemispheres. A value of {Mathematical expression} was obtained, where the first error is statistical and the second systematic. The uncertainty on the decay width {Mathematical expression} is not included in these errors. A fractional variation of this width by ±8% about its Standard Model prediction would result in a variation of the measured {Mathematical expression} fraction of ±0.0015.

Original language | English |
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Pages (from-to) | 17-30 |

Number of pages | 14 |

Journal | European Physical Journal C |

Volume | 65 |

Issue number | 1 |

DOIs | |

State | Published - 1 Mar 1995 |

Externally published | Yes |

## ASJC Scopus subject areas

- Physics and Astronomy (miscellaneous)