| Experiment | Measurement | Reference |
|---|---|---|
| Belle | \([1.02 \pm 0.04\mbox{ (stat)} \pm 0.15\mbox{ (syst)}] \times 10^{-3}\) | PRD 69, 112002(2004) |
| BaBar | \([1.08 \pm 0.03\mbox{ (stat)} \pm 0.05\mbox{ (syst)}] \times 10^{-3}\) | PRD 79, 112004 (2009) |
| Average | \(\mathbf{[1.07 \pm 0.05\mbox{ (combined)}] \times 10^{-3}}\) |