Measurements of CP-Violating Asymmetries in the Decay B0-->K+K-K0

TL;DR

This study measures CP-violating asymmetries in B0 decays to K+ K- K0 using a large dataset, finding significant CP violation effects and providing detailed asymmetry parameters for various decay channels.

Contribution

It provides the first detailed measurement of CP violation parameters in B0 --> K+ K- K0 decays with a large dataset, including separate analyses for specific intermediate states.

Findings

CP asymmetry A_CP = -0.015 ± 0.077 ± 0.053

Effective beta angle beta_eff = 0.352 ± 0.076 ± 0.026 rad

CP violation significance of 4.8 sigma

Abstract

We analyze the decay B0 --> K+ K- K0 using 383 million B-Bbar events collected by the BaBar detector at SLAC to extract CP violation parameter values over the Dalitz plot. Combining all K+ K- K0 events, we find A_CP = -0.015 +/- 0.077 +/- 0.053 and beta_eff = 0.352 +/- 0.076 +/- 0.026 rad, corresponding to a CP violation significance of 4.8 sigma. A second solution near pi/2 - beta_eff is disfavored with a significance of 4.5 sigma. We also report A_CP and beta_eff separately for decays to phi(1020) K0, f0(980) K0, and K+ K- K0 with m_{K+ K-} > 1.1 GeV/c^2.