Abstract
A sample of ${\rm Z}^0$ decays containing b-flavoured hadrons is tagged using leptons, and events having precise proper time measurements are selected. These events are used to study ${\rm B}^0_{\rm s}$ oscillations. The flavour (b or $\rm \bar{b}$ ) at decay is determined from the lepton charge while the flavour at production is determined from jet charge or the charge of a second lepton, where available. The experiment was not able to resolve the oscillatory behaviour, and we deduce that the ${\rm B}^0_{\rm s}$ oscillation frequency $\Delta m_{\rm s} > 5.2$ ps $^{-1}$ at the 95% confidence level.
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