| Experiment | Measurement | Reference |
|---|---|---|
| Belle | \([0.34 ^{+0.11}_{-0.14}\mbox{ (stat)} ^{+0.03}_{-0.02}\mbox{ (syst)} ^{+0.08}_{-0.05}\mbox{ (fs)}] \times 10^{-4}\) | PRL 106, 121802 (2011) |
| Average | \(\mathbf{[0.34 ^{+0.14}_{-0.15}\mbox{ (combined)}] \times 10^{-4}}\) |