| Experiment | Measurement | Reference |
|---|---|---|
| Belle | \([22.2 \pm 2.2\mbox{ (stat)} ^{+2.6}_{-2.4}\mbox{ (syst)}] \times 10^{-4}\) | PRL 100:092001, 2008 |
| BaBar | \([1.31 \pm 0.07\mbox{ (stat)} \pm 0.12\mbox{ (syst)}] \times 10^{-3}\) | PRD 83, 032004 (2011) |
| Average | \(\mathbf{[14.4 \pm 1.3\mbox{ (combined)}] \times 10^{-4}}\) |