| Experiment | Measurement | Reference |
|---|---|---|
| Belle | \([1.11 ^{+0.36}_{-0.34}\mbox{ (stat)} \pm 0.09\mbox{ (syst)}] \times 10^{-5}\) | PRL 107, 091803 (2011) |
| BaBar | \([1 \pm 1\mbox{ (stat)} \pm 0\mbox{ (syst)}] \times 10^{-5}\) | PRL 102 132001 (2009) |
| Average | \(\mathbf{[1.08 \pm 0.31\mbox{ (combined)}] \times 10^{-5}}\) |