| Experiment | Measurement | Reference |
|---|---|---|
| Belle | \([0.078 \pm 0.019\mbox{ (stat)} \pm 0.009\mbox{ (syst)}]\) | PRL 87, 111801 (2001) |
| BaBar | \([0.0813 \pm 0.0040\mbox{ (stat)} ^{+0.0042}_{-0.0031}\mbox{ (syst)}] \times 10^{0}\) | PRD 71, 031102 (2005) |
| Average | \(\mathbf{[0.0811 \pm 0.0053\mbox{ (combined)}] \times 10^{0}}\) |