Abstract
The average lifetime ofB hadrons produced in hadronicZ 0 decays has been measured with the DELPHI detector at LEP. The measurement is based on the analysis of the impact parameter distributions of highp t muons and hadrons. The resulting meanB lifetimes are τ B =(1.30±0.10±0.08)ps and τ B =(1.27±0.04±0.12)ps respectively, giving a combined value of τ B =(1.28±0.10)ps. The hadronic sample was also used to measure the partialZ 0 width $${{\Gamma _{b\bar b} } \mathord{\left/ {\vphantom {{\Gamma _{b\bar b} } {\Gamma _h }}} \right. \kern-\nulldelimiterspace} {\Gamma _h }}$$ and gave a value of 0.222 −0.031 +0.033 ±0.017.
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