| Abstract |
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We measure the time-dependent \CP asymmetry parameters in B0 --> K+ K- K0
based on a data sample of approximately 227 million
B-meson pairs recorded at the Upsilon(4S) resonance with the BaBar detector
at the PEP-II B-meson Factory at SLAC.
We reconstruct two-body B0 decays to Phi(1020) K0S and Phi(1020)K0L, and
the three-body decay K+ K- K0S with Phi(1020) K0S excluded.
For the B0 --> Phi K0 decays, we measure
sin(2 beta_{eff})(Phi K0) = +0.50 +/- 0.25(stat) +0.07/-0.04(syst).
The B0 --> K+ K- K0S decays are dominated by K+ K- S-wave, as determined from
an angular analysis; we measure
sin(2 beta_{eff})(K+ K- K0S) = +0.55 +/- 0.22(stat) +/- 0.04(syst) +/- 0.11(CP),
where the last error is due to the uncertainty in the fraction of CP-even contributions
to the decay amplitude. We find no evidence for direct CP violation.
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