| Experiment | Measurement | Reference |
|---|---|---|
| Belle | \([1.16 ^{+0.31}_{-0.19}\mbox{ (stat)} ^{+0.15}_{-0.17}\mbox{ (syst)} ^{+0.26}_{-0.19}\mbox{ (fs)}] \times 10^{-4}\) | PRL 106, 121802 (2011) |
| Average | \(\mathbf{[1.16 ^{+0.43}_{-0.32}\mbox{ (combined)}] \times 10^{-4}}\) |