| Experiment | Measurement | Reference |
|---|---|---|
| Belle | \([1.07 \pm 0.06\mbox{ (stat)} \pm 0.10\mbox{ (syst)}] \times 10^{-3}\) | Experiment Note |
| Belle | \([8.0 \pm 0.6\mbox{ (stat)} \pm 1.5\mbox{ (syst)}] \times 10^{-4}\) | PLB 553, 159 (2003) |
| Average | \(\mathbf{[9.8 \pm 0.9\mbox{ (combined)}] \times 10^{-4}}\) |