| Experiment | Measurement | Reference |
|---|---|---|
| BaBar | \([1.06 \pm 0.23\mbox{ (stat)} \pm 0.04\mbox{ (syst)}]\) | PRL 96 052002 (2006) |
| BaBar | \([1.28 \pm 0.10\mbox{ (stat)} \pm 0.38\mbox{ (syst)}]\) | PRD 70 011101 (2004) |
| Average | \(\mathbf{[1.12 \pm 0.20\mbox{ (combined)}] \times 10^{0}}\) |