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

Abstract : 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 the mass difference $\Delta m_{s}$ of the $B^{0}_{s}$ mass eigenstates. Using the world's largest $B^{0}_{s}$ meson sample accumulated in a dataset, corresponding to an integrated luminosity of 1.0 fb$^{-1}$, collected by the LHCb experiment at the CERN LHC in 2011, a measurement of $\Delta m_{s}$ is presented. A total of about 34,000 $B^{0}_{s}\rightarrowD^{-}_{s}\pi^{+}$ signal decays are reconstructed, with an average decay time resolution of 44 fs. 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 precise measurement to date.
Document type :
Journal articles

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Contributor : Danielle Cristofol <>
Submitted on : Thursday, April 18, 2013 - 8:27:52 AM
Last modification on : Wednesday, September 16, 2020 - 4:19:30 PM

### Citation

R. Aaij, C. Abellan Beteta, B. Adeva, M. Adinolfi, C. Adrover, et al.. Precision measurement of the $B^{0}_{s}$-$\bar{B}^{0}_{s}$ oscillation frequency with the decay $B^{0}_{s}\rightarrowD^{-}_{s}\pi^{+}$. New Journal of Physics, Institute of Physics: Open Access Journals, 2013, 15, pp.053021. ⟨10.1088/1367-2630/15/5/053021⟩. ⟨in2p3-00814946⟩

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