| Experiment | Measurement | Reference |
|---|---|---|
| Belle | \([1.20 ^{+0.33}_{-0.29}\mbox{ (stat)} \pm 0.21\mbox{ (syst)}] \times 10^{-4}\) | PRL 89 151802 (2002) |
| BaBar | \([0.97 \pm 0.07\mbox{ (stat)} \pm 0.09\mbox{ (syst)}] \times 10^{-4}\) | PRD 85, 092017 (2012) |
| Average | \(\mathbf{[0.99 \pm 0.11\mbox{ (combined)}] \times 10^{-4}}\) |