| Experiment | Measurement | Reference |
|---|---|---|
| Belle | \([1.78 ^{+0.48}_{-0.44}\mbox{ (stat)} \pm 0.12\mbox{ (syst)}] \times 10^{-6}\) | PRL 107, 091803 (2011) |
| BaBar | \([2.8 \pm 0.8\mbox{ (stat)} \pm 0.1\mbox{ (syst)}] \times 10^{-6}\) | PRL 102 132001 (2009) |
| Average | \(\mathbf{[2.04 \pm 0.41\mbox{ (combined)}] \times 10^{-6}}\) |