We report the observation of B0(s) - B-bar0_s oscillations using
1 fb-1 of data from p anti-p collisions with the CDF II detector at the
Fermilab Tevatron. We measure the probability, as a function of proper
decay time, that the B0(s) decays with the same, or opposite, flavor as its
flavor at production, which is determined using opposite-side and same-side
flavor identification methods. We find a signal consistent with B0(s) -
B-bar0_s oscillations, with a significance greater than 5 sigma. We
measure Delta m_s = 17.77 +/- 0.10(stat) +/- 0.07(syst) ps-1.
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Updated: Thursday, 2007 March 08 16:08:18 CST automatically from input from Carol Picciolo