| Experiment | Measurement | Reference |
|---|---|---|
| Belle | \([4.1 \pm 0.6\mbox{ (stat)} \pm 0.9\mbox{ (syst)}] \times 10^{-4}\) | PLB 634, 155 (2006) ( |
| BaBar | \([2.94 \pm 0.95\mbox{ (stat)} \pm 0.93\mbox{ (syst)} \pm 0.31\mbox{ (chic1 br (correlated))}] \times 10^{-4}\) | PRL 94 141801 (2005) (superseded) |
| BaBar | \([2.6 \pm 0.5\mbox{ (stat)} \pm 0.4\mbox{ (syst)}] \times 10^{-4}\) | PRL 102 132001 (2009) |
| Average | \(\mathbf{[3.0 \pm 0.6\mbox{ (combined)}] \times 10^{-4}}\) | CL=0.2327 |