Measurement of the \({\mathrm{B^0_s}}\) lifetime and study of \({\mathrm{B^0_s}}\)-\({\overline{\mathrm{B^0_s}}}\) oscillations using \({{\mathrm{ D_s}}\ell}\) events

  • The DELPHI Collaboration
  • P. Abreu et al.
Experimental physics


Lifetime and oscillations of \({\rm B^0_s}\) mesons have been studied in events with a large transverse momentum lepton and a \({\rm D_s}\) of opposite electric charge in the same hemisphere, selected from about 3.6 million hadronic \({\rm Z^0}\) decays accumulated by DELPHI between 1992 and 1995. The \({\rm B^0_s}\) lifetime and the fractional width difference between the two physical \({\rm B^0_s}\) states have been found to be:

\(\) \(\)

In the latter result it has been assumed that \(\tau_{{\rm B^0_s}}=\tau_{\rm B_d^}\). Using the same sample, a limit on the mass difference between the physical \(\mbox{B}^0_{\mathrm s}\) states has been set:


with a corresponding sensitivity equal to \(8.1 ps^{-1}\).


Physical State Transverse Momentum Electric Charge Mass Difference Width Difference 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer-Verlag Berlin Heidelberg 2000

Authors and Affiliations

  • The DELPHI Collaboration
  • P. Abreu et al.
    • 1
  1. 1.LIP, IST, FCUL – Av. Elias Garcia, 14-1°, 1000 Lisboa Codex, PortugalPT

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