| Experiment | Measurement | Reference |
|---|---|---|
| Belle | \([0.89 \pm 0.15\mbox{ (stat)} \pm 0.17\mbox{ (syst)} ^{+0.00}_{-0.26}\mbox{ (model uncertainty)}] \times 10^{-4}\) | PRL 94 (2005) 221805 |
| Average | \(\mathbf{[0.89 ^{+0.23}_{-0.34}\mbox{ (combined)}] \times 10^{-4}}\) |