| Experiment | Measurement | Reference |
|---|---|---|
| Belle | \([1.25 \pm 0.14\mbox{ (stat)} ^{+0.10}_{-0.12}\mbox{ (syst)} \pm 0.38\mbox{ (etac br (correlated))}] \times 10^{-3}\) | PRL 90, 071801(2003) |
| BaBar | \([8.7 \pm 1.5\mbox{ (stat+syst combined)}] \times 10^{-4}\) | PRL 96 052002 (2006) |
| BaBar | \([12.9 \pm 0.9\mbox{ (stat)} \pm 1.3\mbox{ (syst)} \pm 3.6\mbox{ (etac br (correlated))}] \times 10^{-4}\) | PRD 70 011101 (2004) |
| Average | \(\mathbf{[9.2 \pm 1.4\mbox{ (combined)}] \times 10^{-4}}\) |