| Experiment | Measurement | Reference |
|---|---|---|
| Belle | \([-2.887 \pm 0.090\mbox{ (stat)} \pm 0.008\mbox{ (syst)}] \times 10^{0}\) | PRL 95, 091601 (2005) |
| BaBar | \([-2.93 \pm 0.08\mbox{ (stat)} \pm 0.04\mbox{ (syst)}] \times 10^{0}\) | PRD 76 031102 (2007) |
| Average | \(\mathbf{[-2.909 \pm 0.064\mbox{ (combined)}] \times 10^{0}}\) |