We report the observation of B0(s)-B-bar0_s oscillations from a
time-dependent measurement of the B0(s)-B-bar0_s oscillation frequency
Delta m_s. Using a data sample of 1 fb-1 of p anti-p collisions at s**(1/2) =
1.96 TeV collected with the CDF II detector at the Fermilab Tevatron, we
find signals of 5600 fully reconstructed hadronic B_s decays, 3100 partially
reconstructed hadronic B_s decays, and 61,500 partially reconstructed
semileptonic B_s decays. We measure the probability as a function of proper
decay time that the B_s decays with the same, or opposite, flavor as the
flavor at production, and we find a signal for B0(s)-B-bar0_s oscillations.
The probability that random fluctuations could produce a comparable signal
is 8 x 10-8, which exceeds 5 sigma significance. We measure Delta m_s =
17.77 +/- 0.10 (stat) +/- 0.07 (syst) ps-1 and extract |V_td/V_ts| = -.2060
+/- 0.0007 (exp)+0.0081_-0.0060 (theor).
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Updated: Wednesday, 2006 December 20 10:56:03 CST automatically from input from Carol Picciolo