| Experiment | Measurement | Reference |
|---|---|---|
| Belle | \([2.938 \pm 0.064\mbox{ (stat)} \pm 0.010\mbox{ (syst)}] \times 10^{0}\) | PRL 95, 091601 (2005) |
| BaBar | \([2.91 \pm 0.05\mbox{ (stat)} \pm 0.03\mbox{ (syst)}] \times 10^{0}\) | PRD 76 031102 (2007) |
| Average | \(\mathbf{[2.923 \pm 0.043\mbox{ (combined)}] \times 10^{0}}\) |