Title: Measurement of the B+ and B0 Lifetimes 
using Topological Vertexing at SLD

Abstract: The lifetimes of B+ and B0 mesons 
have been measured using the entire sample of 
polarized Z0 decays collected by the 
SLD experiment between 1993 and 1998. 
We report the inclusive analysis of the 
400,000 hadronic Z0's collected between 1996 
and 1998 using the upgraded vertex detector 
(VXD3). Approximately 50,000 B hadron decay 
vertices are reconstructed with good charge 
purity. This charge purity is then enhanced using 
vertex information, as well as information on the 
initial state flavor of the hemisphere containing 
the vertex. Combining these results with the 
previously published 1993-95 SLD results 
(based upon the 150,00 hadronic Z0's obtaining 
using the VXD2 vertex detector), 
we obtain individual meson lifetimes with total errors 
between 2 and 3%, and a total error on the 
lifetime ratio of approximately 3.5%.