| Experiment | Measurement | Reference |
|---|---|---|
| Belle | \([3.1 \pm 0.3\mbox{ (stat)} \pm 0.7\mbox{ (syst)}] \times 10^{-4}\) | PLB 634, 155 (2006) ( |
| BaBar | \([3.27 \pm 0.42\mbox{ (stat)} \pm 0.54\mbox{ (syst)} \pm 0.34\mbox{ (chic1 br (correlated))}] \times 10^{-4}\) | PRL 94 141801 (2005) (superseded) |
| BaBar | \([2.5 \pm 0.2\mbox{ (stat)} \pm 0.2\mbox{ (syst)}] \times 10^{-4}\) | PRL 102 132001 (2009) |
| Average | \(\mathbf{[2.6 \pm 0.3\mbox{ (combined)}] \times 10^{-4}}\) | CL=0.4602 |