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The B^0_s-\bar{B}^0_s oscillation frequency Delta m_s is measured with 36pb^{-1} of data collected in pp collisions at \sqrt{s} = 7 TeV by the LHCbexperiment at the Large Hadron Collider. A total of 1381 B^0_s -> D_s^- \pi^+and \B^0_s -> D_s^- pi^+ pi^- pi^+ signal decays are reconstructed, withaverage decay time resolutions of 44 fs and 36 fs, respectively. An oscillationsignal with a statistical significance of 4.6 sigma is observed. The measuredoscillation frequency is Delta m_s = 17.63 \pm 0.11 (stat) \pm 0.02 (syst)ps^{-1}.

Measurement of the B^0_s - \bar{B}^0_s oscillation frequency Delta m_s in B^0_s -> D_s^-(3) pi decays