Abstract
From a fit to the impact parameter distribution of lepton tracks from semileptonic b decay, the lifetime of B-hadrons produced in e +e − collisions at the Z 0 is measured to be 1.32±0.08 (stat.)±0.09(syst.) ps. Combined with an earlier measurement of the branching ratio Br(B→ℓ νX), the CKM matrix element | V cb| is determined to be 0.046±0.002 (exp.) −0.003 +0.004 (theory).
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