| Experiment | Measurement | Reference |
|---|---|---|
| BaBar | \([1.6 \pm 0.6\mbox{ (stat)} \pm 0.4\mbox{ (syst)}] \times 10^{-5}\) | PRL 90 091801 (2003) (superseded) |
| BaBar | \([2.7 \pm 0.3\mbox{ (stat)} \pm 0.2\mbox{ (syst)}] \times 10^{-5}\) | PRD 76 031101 (2007) |
| Average | \(\mathbf{[2.7 \pm 0.4\mbox{ (combined)}] \times 10^{-5}}\) |