Search for time-dependent<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msubsup><mml:mrow><mml:mi>B</mml:mi></mml:mrow><mml:mrow><mml:mi>s</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msubsup></mml:mrow><mml:mo>−</mml:mo><mml:mrow><mml:mrow><mml:mover><mml:mrow><mml:mrow><mml:msubsup><mml:mrow><mml:mi>B</mml:mi></mml:mrow><mml:mrow><mml:mi>s</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msubsup></mml:mrow></mml:mrow><mml:mrow><mml:mi>¯</mml:mi></mml:mrow></mml:mover></mml:mrow></mml:mrow></mml:math>oscillations using exclusively reconstructed<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msubsup><mml:mrow><mml:mi>D</mml:mi></mml:mrow><mml:mrow><mml:mi>s</mml:mi></mml:mrow><mml:mrow><mml:mo>±</mml:mo></mml:mrow></mml:msubsup></mml:mrow></mml:math>mesons

A search for ${B}_{s}^{0}\ensuremath{-}\overline{{B}_{s}^{0}}$ oscillations is performed using a sample of 400 000 hadronic ${Z}^{0}$ decays collected by the SLAC Large Detector experiment. The ${B}_{s}^{0}$ candidates are reconstructed in the ${B}_{s}^{0}\ensuremath{\rightarrow}{D}_{s}^{\ensuremath{-}}X$ channel with ${D}_{s}^{\ensuremath{-}}\ensuremath{\rightarrow}\ensuremath{\varphi}{\ensuremath{\pi}}^{\ensuremath{-}},$ ${K}^{*0}{K}^{\ensuremath{-}}.$ The ${B}_{s}^{0}$ production flavor is determined using the large forward-backward asymmetry of polarized ${Z}^{0}\ensuremath{\rightarrow}b\overline{b}$ decays and charge information in the hemisphere opposite that of the ${B}_{s}^{0}$ candidate. The decay flavor is tagged by the charge of the ${D}_{s}^{\ifmmode\pm\else\textpm\fi{}}.$ From a sample of 361 candidates with an average ${B}_{s}^{0}$ purity of 40%, we exclude the following values of the oscillation frequency: $\ensuremath{\Delta}{m}_{s}&lt;1.4{\mathrm{ps}}^{\ensuremath{-}1}$ and $2.4&lt;\ensuremath{\Delta}{m}_{s}&lt;5.3{\mathrm{ps}}^{\ensuremath{-}1}$ at the 95% confidence level.