| Experiment | Measurement | Reference |
|---|---|---|
| Belle | \([1.25 \pm 0.08\mbox{ (stat)} \pm 0.22\mbox{ (syst)}] \times 10^{-3}\) | PRD 69, 112002(2004) |
| BaBar | \([1.22 \pm 0.05\mbox{ (stat)} \pm 0.18\mbox{ (syst)}] \times 10^{-3}\) | Experiment Note |
| Average | \(\mathbf{[1.23 \pm 0.15\mbox{ (combined)}] \times 10^{-3}}\) |