| Experiment | Measurement | Reference |
|---|---|---|
| Belle | \([0.23 \pm 0.05\mbox{ (stat)} \pm 0.02\mbox{ (syst)}] \times 10^{-4}\) | PRD 67, 032003(2003) |
| BaBar | \([1.69 \pm 0.14\mbox{ (stat)} \pm 0.07\mbox{ (syst)}] \times 10^{-5}\) | PRL 101 021801 (2008) |
| Average | \(\mathbf{[1.74 \pm 0.15\mbox{ (combined)}] \times 10^{-5}}\) |