| Experiment | Measurement | Reference |
|---|---|---|
| Belle | \([6.0 ^{+2.1}_{-1.8}\mbox{ (stat)} \pm 0.7\mbox{ (syst)} \pm 0.9\mbox{ (br's (correlated))}] \times 10^{-4}\) | PRL 88, 031802 (2002) |
| BaBar | < \(1.8 \times 10^{-4}\) | PRL 96 052002 (2006) |
| BaBar | \([1.84 \pm 0.32\mbox{ (stat)} \pm 0.14\mbox{ (syst)} \pm 0.28\mbox{ (chi_c0 to KK BR)}] \times 10^{-4}\) | PRD 74, 032006 (2006) |
| Average | \(\mathbf{[2.00 \pm 0.44\mbox{ (combined)}] \times 10^{-4}}\) |