A measurement of the \(\mathrm{B_s^0}\) lifetime using reconstructed \(\mathrm{ D_s^-}\) mesons

  • OPAL Collaboration
  • K. Ackerstaff et al.
Experimental physics


We report a measurement of the \(\mathrm{B_s^0}\) meson lifetime from \(\mathrm{B_s^0} \to \mathrm{ D_s^-} \rm{X}\) decays, where \(\mathrm{ D_s^-}\) mesons are reconstructed in the \(\mathrm{ D_s^-} \to \mathrm{\phi\pi^-}\) and \(\mathrm{ D_s^-}\to\mathrm{K^{*0}K^-}\) decay channels. From approximately 3.7 million hadronic \(\mathrm{Z}^0\) decays recorded by the OPAL detector at LEP a sample is selected containing 911 \(\pm\) 83 candidates, of which \(519 \pm 136\) are estimated to be from \(\mathrm{B_s^0}\) meson decays. Fitting the distribution of the distance from the beam spot to the decay vertex of the \(\mathrm{ D_s^-}\) candidates with an unbinned likelihood function we measure \(\) where the errors are statistical and systematic, respectively.


Likelihood Function Opal Detector Decay Channel Beam Spot Decay Vertex 
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Copyright information

© Springer-Verlag Berlin Heidelberg 1998

Authors and Affiliations

  • OPAL Collaboration
  • K. Ackerstaff et al.
    • 1
  1. 1. CERN, European Organisation for Particle Physics, CH-1211 Geneva 23, Switzerland CH

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