Measurement of the B+ and B0 Lifetimes and Search for CP(T) Violation using Reconstructed Secondary Vertices

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dc.creatorThe OPAL Collaboration
dc.creatoral, G. Abbiendi et
dc.date1999-01-13
dc.date.accessioned2026-07-07T12:02:28Z
dc.date.available2026-07-07T12:02:28Z
dc.descriptionThe lifetimes of the B+ and B0 mesons, and their ratio, have been measured in the OPAL experiment using 2.4 million hadronic Z0 decays recorded at LEP. Z0 -> b bbar 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 tau(B+) = 1.643 +- 0.037 +- 0.025 ps tau(B0) = 1.523 +- 0.057 +- 0.053 ps ratio tau(B+)/tau(B0) = 1.079 +- 0.064 +- 0.041 where in each case the first error is statistical and the second systematic. A larger data sample of 3.1 million hadronic Z0 decays has been used to search for CP and CPT violating effects by comparison of inclusive b and bbar hadron decays. No evidence for such effects is seen. The CP violation parameter Re(epsilon_B) is measured to be Re(epsilon_B) = 0.001 +- 0.014 +- 0.003 and the fractional difference between b and bbar hadron lifetimes is measured to be -0.001 +- 0.012 +- 0.008
dc.description31 pages, LaTeX, including 9 eps figures, submitted to European Physical Journal C
dc.identifierhttps://arxiv.org/abs/hep-ex/9901017
dc.identifierhttp://arxiv.org/abs/hep-ex/9901017
dc.identifierEur.Phys.J.C12:609-626,2000
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/207450
dc.subjectHigh Energy Physics - Experiment
dc.titleMeasurement of the B+ and B0 Lifetimes and Search for CP(T) Violation using Reconstructed Secondary Vertices
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