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

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Original language English 177-184 8 Physics Letters B 709 3 19 Dec 2011 10.1016/j.physletb.2012.02.031 Published - 19 Mar 2012

### Abstract

The B^0_s-\bar{B}^0_s oscillation frequency Delta m_s is measured with 36 pb^{-1} of data collected in pp collisions at \sqrt{s} = 7 TeV by the LHCb experiment 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, with average decay time resolutions of 44 fs and 36 fs, respectively. An oscillation signal with a statistical significance of 4.6 sigma is observed. The measured oscillation frequency is Delta m_s = 17.63 \pm 0.11 (stat) \pm 0.02 (syst) ps^{-1}.

ID: 3946141