A measurement of the average lifetime of B-hadrons produced bye+e−-collision at\(\left\langle {\sqrt s } \right\rangle = 36.3 GeV\)
1990
Data taken with an improved tracking system have been used to determine the average lifetime of B-hadrons, τB. A study of the pseudo decay length gave
$$\tau _B = (1.46 \pm 0.22(stat.) \pm 0.34(syst.)) ps$$
. From the impact parameter distribution of highp ⊥ electrons and muons, values of
$$\tau _B = \left( {1.27_{ - 0.29}^{ + 0.35} \pm 0.17} \right) ps$$
and
$$\tau _B = \left( {1.36_{ - 0.27}^{ + 0.32} \pm 0.14} \right) ps$$
were obtained. Combining these results, allowing for correlations and adding statistical and systematic errors in quadrature, we obtain
$$\tau _B = \left( {1.36_{ - 0.23}^{ + 0.25} } \right) ps$$
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