Measurement of the B+ and B-0 lifetimes and search for CP(T) violation using reconstructed secondary vertices

The lifetimes of the \(\rm B^+\) and \(\rm B^0\) mesons, and their ratio, have been measured in the OPAL experiment using 2.4 million hadronic \(\rm Z^0\) decays recorded at LEP. \(\rm Z^0 \rightarrow \rm b\overline{b}\) decays were tagged using displaced secondary vertices and high momentum electrons and muons. The lifetimes were then measured using well-reconstructed charged and neutral secondary vertices selected in this tagged data sample. The results are