| Experiment | Measurement | Reference |
|---|---|---|
| Belle | \([2.91 \pm 0.28\mbox{ (stat)} \pm 0.33\mbox{ (syst)} ^{+0.08}_{-0.54}\mbox{ (model)}] \times 10^{-4}\) | Experiment Note |
| Belle | \([2.9 \pm 1.0\mbox{ (stat)} \pm 0.4\mbox{ (syst)}] \times 10^{-4}\) | PLB 553, 159 (2003) |
| Average | \(\mathbf{[2.91 \pm 0.51\mbox{ (combined)}] \times 10^{-4}}\) |