| Experiment | Measurement | Reference |
|---|---|---|
| Belle | \([5.4 ^{+4.0}_{-1.0}\mbox{ (stat)} ^{+1.1}_{-0.9}\mbox{ (syst)}] \times 10^{-6}\) | arXiv:1408.6457 |
| BaBar | \([-1.2 \pm 0.4\mbox{ (stat)}] \times 10^{-5}\) | PRD 79 112001 (2009) |
| Average | \(\mathbf{[-1.1 \pm 2.4\mbox{ (combined)}] \times 10^{-6}}\) |