Measurement Of The B(0) And B+ Lifetimes
PHYSICS LETTERS B(1993)
Abstract
From a data sample of approximately 240 000 hadronic Z0 decays recorded during 1991 a sample of about 130 semileptonic B hadron decays containing a D0, D+ or D*+ has been isolated. Using silicon microvertex detector information the decay vertices in these events have been reconstructed. The average B hadron lifetime of the mix of B hadrons in this event sample is measured to be 1.51(+0.16/-0.14) +/- 0.11 ps. From the distribution of decay times in the different samples the lifetimes of the B0 and B+ mesons are determined to be 1.51(+0.24+0.12/-0.23-0.14) ps and 1.51(+0.30+0.12/-0.28-0.14) ps, respectively. The measured ratio of the B+ to B0 lifetimes of 1.00(+0.33/-0.25) +/- 0.08 supports expectations that the lifetimes are similar.
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Key words
particle physics
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