Measurement of the BS0 meson lifetime using semileptonic decays

Phys. Rev. D 59, 032004 – Published 11 January 1999
F. Abe et al. (CDF Collaboration)


The lifetime of the BS0 meson is measured using the semileptonic decay BS0DS-l+νX. The data sample consists of about 110pb-1 of pp¯ collisions at s=1.8TeV collected by the CDF detector at Fermilab. Four different DS- decay modes are reconstructed resulting in approximately 600 DS-l+ signal events. The BS0 meson lifetime is determined to be τ(BS0)=(1.36±0.09-0.05+0.06)ps, where the first and second uncertainties are statistical and systematic, respectively. The BS0 meson decay length distribution is examined for a lifetime difference ΔΓ/Γ between the two mass eigenstates of the BS0 meson. An upper limit of ΔΓ/Γ<0.83 is set at the 95% confidence level.


  • Received 4 August 1998
  • Published 11 January 1999

© 1999 The American Physical Society

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