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A key ingredient to searches for physics beyond the Standard Model in$B^{0}_{s}$ mixing phenomena is the measurement of the$B^{0}_{s}$-$\bar{B}^{0}_{s}$ oscillation frequency, which is equivalent to themass difference $\Delta m_{s}$ of the $B^{0}_{s}$ mass eigenstates. Using theworld's largest $B^{0}_{s}$ meson sample accumulated in a dataset,corresponding to an integrated luminosity of 1.0 fb$^{-1}$, collected by theLHCb experiment at the CERN LHC in 2011, a measurement of $\Delta m_{s}$ ispresented. A total of about 34,000 $B^{0}_{s}\rightarrowD^{-}_{s}\pi^{+}$signal decays are reconstructed, with an average decay time resolution of 44fs. The oscillation frequency is measured to be \mbox{$\Delta m_{s}$ = 17.768$\pm$ 0.023 (stat) $\pm$ 0.006 (syst) ps$^{-1}$}, which is the most precisemeasurement to date.

Precision measurement of the $B^{0}_{s}$-$\bar{B}^{0}_{s}$ oscillation frequency with the decay $B^{0}_{s}\rightarrowD^{-}_{s}\pi^{+}$