Abstract: We report a measurement of the bottom-strange meson mixing phase
s using the time evolution of B0s ! J=c ð! þ
Þð! KþK
Þ decays in which the quark-flavor content of the bottom-strange meson is identified at production. This measurement uses the full data set of proton-antiproton collisions at ffiffi s p ¼ 1:96 TeV collected by the Collider Detector experiment at the Fermilab Tevatron, corresponding to 9:6 fb
1 of integrated luminosity. We report confidence regions in the two-dimensional space of
s and the B0s decay-width difference
s and measure
s 2 ½
=2;
1:51 [ ½
0:06; 0:30[½1:26; =2 at the 68% confidence level, in agreement with the standard model expectation. Assuming the standard model value of
s, we also determine
s ¼ 0:068 0:026ðstatÞ 0:009ðsystÞ ps
1 and the mean B0s lifetime s ¼ 1:528 0:019ðstatÞ 0:009ðsystÞ ps, which are consistent and competitive with determinations by other experiments.

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