| Experiment | Measurement | Reference |
|---|---|---|
| Belle | \([1.18 \pm 0.15\mbox{ (stat)} \pm 0.16\mbox{ (syst)}] \times 10^{-4}\) | PRL 89 151802 (2002) |
| BaBar | \([1.02 \pm 0.04\mbox{ (stat)} \pm 0.06\mbox{ (syst)}] \times 10^{-4}\) | PRD 85, 092017 (2012) |
| Average | \(\mathbf{[1.04 \pm 0.07\mbox{ (combined)}] \times 10^{-4}}\) |