We report a measurement of the bottom-strange meson mixing
phase βs using the time evolution of B(s)0→J/ψ(→μ+μ-)ϕ(→K+K-)
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 √s=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 βs and the B(s)0 decay-width difference
ΔΓs and measure βs∈[-π/2,-1.51]∪[-0.06,0.30]∪[1.26,π/2]
at the 68% confidence level, in agreement with the standard model
expectation. Assuming the standard model value of βs, we also determine
ΔΓs=0.068±0.026(stat)±0.009(syst) ps-1 and the mean B(s)0
lifetime τs=1.528±0.019(stat)±0.009(syst) ps, which are consistent
and competitive with determinations by other experiments.
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Updated: Wednesday, 2012 November 21 10:50:48 CST automatically from input from Stephanie A Schuler