# Observation of $B^0_s-\bar{B}^0_s$ Oscillations

Abstract : We report the observation of Bs-Bsbar oscillations from a time-dependent measurement of the Bs-Bsbar oscillation frequency Delta ms. Using a data sample of 1 fb^-1 of p-pbar collisions at sqrt{s}=1.96 TeV collected with the CDF II detector at the Fermilab Tevatron, we find signals of 5600 fully reconstructed hadronic Bs decays, 3100 partially reconstructed hadronic Bs decays, and 61500 partially reconstructed semileptonic Bs decays. We measure the probability as a function of proper decay time that the Bs decays with the same, or opposite, flavor as the flavor at production, and we find a signal for Bs-Bsbar oscillations. The probability that random fluctuations could produce a comparable signal is 8 X 10^-8, which exceeds 5 sigma significance. We measure Delta ms = 17.77 +- 0.10 (stat) +- 0.07 (syst) ps^-1 and extract |Vtd/Vts| = 0.2060 +- 0.0007 (exp) + 0.0081 - 0.0060 (theor).
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00128976
Contributor : Dominique Girod <>
Submitted on : Monday, February 5, 2007 - 11:41:12 AM
Last modification on : Wednesday, May 27, 2020 - 7:20:03 PM

### Citation

A. Abulencia, J. Adelman, T. Affolder, T. Akimoto, M. G. Albrow, et al.. Observation of $B^0_s-\bar{B}^0_s$ Oscillations. Physical Review Letters, American Physical Society, 2006, 97, pp.242003. ⟨10.1103/PhysRevLett.97.242003⟩. ⟨in2p3-00128976⟩

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