We report on a measurement of b-hadron lifetimes in the fully
reconstructed decay modes B+ --> J/psi K+, B0 --> J/psi K*(892)0,
B0 -> J/psi K0(s), and Lambda0(b) --> J/psi Lambda0 using data
corresponding to an integrated luminosity of 4.3 fb-1, collected by the
CDF II detector at the Fermilab Tevatron. The measured lifetimes are
tau(B+) ñ.639 +/- 0.009 (stat) +/- 0.009 (syst) ps, tau(B0) ñ.507 +/-
0.010 (stat) +/- 0.008 (syst) ps and tau (Lambda0(b)) ñ.537 +/- 0.045
(stat) +/- 0.014 (syst) ps. The lifetime ratios are tau(B+)/tau(B0)
ñ.088 +/- 0.009 (stat) +/- 0.004 (syst) and tau(Lambda0(b))/tau(B0)
ñ.020 +/- 0.030 (stat) +/- 0.008 (syst). These are the most precise
determinations of these quantities from a single experiment.
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Updated: Tuesday, 2011 March 29 10:10:34 CDT automatically from input from "Carol Picciolo"