| Experiment | Measurement | Reference |
|---|---|---|
| CDF | \([1.13 \pm 0.12\mbox{ (stat)} \pm 0.09\mbox{ (syst)} \pm 0.19\mbox{ (norm)}] \times 10^{-2}\) | PRL 108, 201801 (2012) |
| Belle | \([1.76 ^{+0.23}_{-0.22}\mbox{ (stat)} \pm 0.40\mbox{ (syst)}] \times 10^{-2}\) | PRD 87 (2013) 031101 |
| Average | \(\mathbf{[1.27 \pm 0.21\mbox{ (combined)}] \times 10^{-2}}\) |