F. Abe et al., MEASUREMENT OF THE AVERAGE LIFETIME OF B-HADRONS PRODUCED IN P(P)OVER-BAR COLLISIONS AT ROOT-S = 1.8 TEV, Physical review letters, 71(21), 1993, pp. 3421-3426
The average b-hadron lifetime has been measured using a high statistic
s sample of B --> J/psi) X decays recorded with the Collider Detector
at Fermilab. The decay vertices of 5344 inclusive J/psi --> mu+mu-cand
idates have been reconstructed using information from a silicon vertex
detector. The measured B lifetime, which is the average over all b ha
drons produced in ppBAR collisions at square-root s = 1.8 TeV weighted
by their branching ratios into J/psi, is 1.46 +/- 0.06(stat) +/- 0.06
(syst) ps.