# Direct limits on the $B_s^0$ oscillation frequency

Abstract : We report the first direct two-sided bound on the $B^0_s$ oscillation frequency using a large sample of $B^0_s$ semileptonic decays corresponding to approximately 1 fb$^{-1}$ of integrated luminosity collected by the \dzer\ experiment in 2002--2006 during Run II of the Fermilab Tevatron Collider. The flavor (i.e., $B^0_s$ or $\bar{B}^0_s$) of the \bs meson at the time of production was found using an opposite-side tagging technique, and the flavor at the time of decay was determined from the charge of the muon in the partially reconstructed decay $\bs\to \mu^{+}D_{s}^{-}X$, $D_{s}^{-}\to \phi \pi^{-}$, $\phi\to K^{+}K^{-}$. A likelihood scan over the oscillation frequency, $\Delta m_s$, gives a most probable value of 19 ps$^{-1}$ and a range of $17 < \Delta m_s < 21$ ps$^{-1}$ at the 90% C.L. At $\Delta m_s=19$ ps$^{-1}$, the amplitude method yields a result that deviates from the hypothesis of an oscillation amplitude of zero by 2.5 standard deviations, corresponding to a two-sided C.L. of 1%.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00025788
Contributor : Sylvie Flores <>
Submitted on : Thursday, March 16, 2006 - 4:08:38 PM
Last modification on : Wednesday, September 16, 2020 - 4:23:40 PM

### Citation

V.M. Abazov, B. Abbott, M. Abolins, B.S. Acharya, M. Adams, et al.. Direct limits on the $B_s^0$ oscillation frequency. Physical Review Letters, American Physical Society, 2006, 97, pp.021802. ⟨10.1103/PhysRevLett.97.021802⟩. ⟨in2p3-00025788⟩

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