Observation of Bs0B¯s0 Oscillations

A. Abulencia et al. (CDF Collaboration)
Phys. Rev. Lett. 97, 242003 – Published 12 December 2006

Abstract

We report the observation of Bs0B¯s0 oscillations from a time-dependent measurement of the Bs0B¯s0 oscillation frequency Δms. Using a data sample of 1fb1 of pp¯ collisions at s=1.96TeV 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 61 500 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 Bs0B¯s0 oscillations. The probability that random fluctuations could produce a comparable signal is 8×108, which exceeds 5σ significance. We measure Δms=17.77±0.10(stat)±0.07(syst)ps1 and extract |Vtd/Vts|=0.2060±0.0007(Δms)0.0060+0.0081(Δmd+theor).

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  • Received 18 September 2006

DOI:https://doi.org/10.1103/PhysRevLett.97.242003

©2006 American Physical Society

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Vol. 97, Iss. 24 — 15 December 2006

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