The B[sup 0] and B[sup+] meson lifetimes have been measured in e[sup+]e[sup -] annihilation data collected in 1999 and 2000 with the BABAR detector at center-of-mass energies near the[Upsilon](4S) resonance. Events are selected in which one B meson is fully reconstructed in a hadronic final state while the second B meson is reconstructed inclusively. A combined fit to the B[sup 0] and the B[sup+] decay time difference distributions yields[tau][sub B[sup 0]]= 1.546[+-] 0.032 (stat)[+-] 0.022 (syst) ps, [tau][sub B[sup+]]= 1.673[+-] 0.032 (stat)[+-] 0.023 (syst) ps and[tau][sub B[sup+]]/[tau][sub B[sup 0]]= 1.082[+-] 0.026 (stat)[+-] 0.012 (syst).

The B° and B meson lifetimes have been measured in ee− annihilation data collected in 1999 and 2000 with the BABAR detector at center-of-mass energies near the [Upsilon](4S) resonance. Events are selected in which one B meson is fully reconstructed in a hadronic final state while the second B meson is reconstructed inclusively. A combined fit to the B° and the B+ decay time difference distributions yields [tau]{sub B{sup 0}} = 1.546 ± 0.032 (stat) ± 0.022 (syst) ps, [tau]{sub B{sup +}} = 1.673 ± 0.032 (stat) ± 0.023 (syst) ps and [tau]{sub B{sup +}}/[tau]{sub B{sup 0}} = 1.082 ± 0.026 (stat) ± 0.012 (syst).

Data collected with the BABAR detector at the PEP-II asymmetric B Factory at SLAC are used to measure the lifetimes of the B[sup 0] and B[sup+] mesons. The data sample consists of 8.3 fb[sup -1] collected near the[Upsilon](4S) resonance. B[sup 0] and B[sup+] mesons are fully reconstructed in several exclusive hadronic decay modes to charm and charmonium final states. The B lifetimes are determined from the flight length difference between the two B mesons.

Lifetime measurements for B0 and B+ are presented using semileptonic decays of B mesons from 360 pb-1 of data collected by CDF's lepton plus displaced track trigger. The decays B 2!l[nu]DX, where D is either D +, D0, or D* +, are partially reconstructed from a muon or electron, a displaced track, and a fully reconstructed charm meson. The B 0 and B+ lifetimes are obtained from an unbinned maximum-likelihood fit to the proper decay length distributions. The measured lifetimes are [tau]B 0 = 1.527 ± 0.012(stat.) ± 0.023(syst.)ps and [tau]B + = 1.629 ± 0.013(stat.) ± 0.025(syst.)ps.