Measurement of the
and search for CP(T) violation
using reconstructed secondary vertices
The OPAL Collaboration
G.Abbiendi - et al.
Dipartimento di Fisica dell' Università di Bologna and INFN,
40126 Bologna, Italy
Received: 11 December 1998 / Published online: 3 February 2000 - © Springer-Verlag 2000 2000
The lifetimes of the and mesons, and their ratio, have been measured in the OPAL experiment using 2.4 million hadronic decays recorded at LEP. 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
where in each case the first error is statistical and the second systematic.
A larger data sample of 3.1 million hadronic decays has been used to search for CP and CPT violating effects by comparison of inclusive b and hadron decays. No evidence for such effects is seen. The CP violation parameter is measured to be
and the fractional difference between b and hadron lifetimes is measured to be
Copyright Springer-Verlag 2000