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Particles containing the heavy bottom (b) quark decay into particles containing the charm (c) quark. Measuring the lifetimes for this decay gives important information about the weak interaction, e.g. the CKM matrix element lVcbl. The lifetimes of the charged Bu and neutral Bd meson have been measured using 19.3 pb1 of pp collisions at .J8 = 1.8 TeV recorded by the CDF experiment at Fermilab during the 1992-93 Tevatron Collider Run 1A[1]. Unbinned likelihood fits of the proper lifetime distribution of fully reconstructed B ---t 'IJ!K candidates, where W represents either a J j'IJI or a 1/;(2S) and K represents a meson containing a strange ( s) quark, give cr+ = 482 ± 48 ± 15 1-Lm and cr0 = 472 ± 55 ± 25 fLm, and r+ jr0 = 1.02 ± 0.16 ± 0.05 where the first error is statistical and the second error is systematic. Combining the method and results of Reference [2] with the value of r 0 quoted here yields lVcbl = (36 ± 5 ± 4) X 10-3 • This thesis was written under the guidance of Professor Bruce Barnett.

A Measurement of the Charged and Neutral B Meson Lifetimes Using Fully Reconstructed Decay Modes