Measurement of CP Asymmetries in B0 --> Phi K0 and B0 --> K+K-K0S Decays

TL;DR

This paper reports measurements of time-dependent CP asymmetries in B0 decays to specific final states, using a large data sample from BaBar, providing insights into CP violation in the B-meson system.

Contribution

The study presents the first measurements of CP asymmetries in B0 --> Phi K0 and K+K-K0S decays, including an angular analysis to determine CP composition.

Findings

Measured sin(2 beta_eff) for Phi K0 as +0.50 +/- 0.25 (stat) +0.07/-0.04 (syst)

Measured sin(2 beta_eff) for K+K-K0S as +0.55 +/- 0.22 (stat) +/- 0.04 (syst) +/- 0.11 (CP)

Found no evidence of direct CP violation in these decays

Abstract

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.