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Oscillations in the B 0  s - \(\overline{{B}^0_s}\) system were studied in events selected from about 4.3 million hadronic Z0 decays registered by DELPHI between 1992 and 2000. This paper presents updates of two published analyses ([11, 12]). The first analysis, which utilizes leptons emitted with large momentum transverse to a jet, was improved by means of a better algorithm for the vertex reconstuction and a new algorithm for flavour-tagging at production time. The second analysis, which utilizes D s -lepton events, was improved by optimizing the treatment of proper time resolution. No signal of B 0 s oscillations was observed and limits on the mass difference between the physical B 0  s  states were obtained to be: \( \begin{array}{@{}l@{}}  \Delta m_s > 8.0\, {\mathrm{{ps}^{-1}~at~the~95\%~C.L.}}\\  {\mathrm{with~a~sensitivity~of}}~~\Delta m_s = 9.1\,{\mathrm{ps}^{-1}} \end{array}  \) in the high p  t  lepton analysis and \(\begin{array}{@{}l@{}}  \Delta m_s > 4.9\, {\mathrm{{ps}^{-1}~at~the~95\%~C.L.}}\\  {\mathrm{with~a~sensitivity of}}~~\Delta m_s = 8.6\,{\mathrm{ps}}^{-1}   \end{array} \) in the D s -lepton analysis. Previously published results on these analyses are superseded. The combination of these results with those obtained in other independent analyses previously performed in DELPHI (D s -hadron, exclusive B s  0, inclusive vertex) gives: \( \begin{array}{@{}l@{}}  \Delta m_s > 8.5\,{\mathrm{{ps}^{-1}~at~the~95\%~C.L.}} \\  {\mathrm{with~a~sensitivity~of}}~~ \Delta m_s = 12.0\,{\mathrm{ps}}^{-1}.   \end{array} \)

Search for $\mbox{B}^0_s$ - $\overline{\mbox{B}^0_s}$ oscillations in DELPHI using high-p t leptons