Average and Individual B Hadron Lifetimes at CDF.

Book excerpt: Bottom hadron lifetime measurements have been performed using B → J/[psi] → [mu]+[mu]−X dacays recorded with the collider Detector at Fermilab (CDF) during the first half of the 1992--1993 Tevatron collider run. These decays have been reconstructed in a silicon vertex detector. Using 5344 ± 73 inclusive J/[psi] events, the average lifetime of all bottom hadrons produced in 1.8 TeV p{bar p} collisions and decaying into a J/[psi] events, the average lifetime of all bottom hadrons produced in 1.8 TeV p{bar p} collisions and decaying into a J/[psi] is found to be 1.46 ± 0.06(stat) ±0.06(sys)ps. The charged and neutral B meson lifetimes have been measured separately using 75 ±10 (charged) and 61±9 (neutral) fully reconstructed decays; preliminary results are [tau]{sup ±} = 1.63 ± 0.21(stat) ± 0.16(sys) ± 0. 10(sys) ps, yielding a lifetime ratio of [tau]{sup ±}/[tau]° = 1.06{plus_minus} 0.20(stat){plus_minus}0.12(sys).