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<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>B</mml:mi><mml:mi>s</mml:mi></mml:msub><mml:mo>−</mml:mo><mml:msub><mml:mover accent="true"><mml:mi>B</mml:mi><mml:mo>¯</mml:mo></mml:mover><mml:mi>s</mml:mi></mml:msub></mml:math>mixing constraints on FCNC and a nonuniversal<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>Z</mml:mi><mml:mo>′</mml:mo></mml:msup></mml:math>
${B}_{s}\ensuremath{-}{\overline{B}}_{s}$ mixing has been measured recently by D0 and CDF. The range predicted in the standard model is consistent with data. However, the standard model central values for $\ensuremath{\Delta}{M}_{{B}_{s}}$ and also $\ensuremath{\Delta}{M}_{{B}_{d}}$ are away from the data which may be indications of new physics. Using the observed values of $\ensuremath{\Delta}{M}_{{B}_{s}}$ …