| Experiment | Measurement | Reference |
|---|
| CDF | \([5.5 \pm 1.0\mbox{ (stat)} \pm 0.6\mbox{ (syst)}] \times 10^{-4}\) | PRD 58 072001 (1998) |
| Belle | \([6.9 \pm 0.6\mbox{ (stat+syst combined)}] \times 10^{-4}\) | PRD 67, 032003(2003) |
| BaBar | \([4.9 \pm 1.6\mbox{ (stat)} \pm 0.4\mbox{ (syst)}] \times 10^{-4}\) | PRL 96 052002 (2006) |
| BaBar | \([6.17 \pm 0.32\mbox{ (stat)} \pm 0.38\mbox{ (syst)} \pm 0.23\mbox{ (psi(2S) br (correlated))}] \times 10^{-4}\) | PRL 94 141801 (2005) |
| Average | \(\mathbf{[6.32 \pm 0.37\mbox{ (combined)}] \times 10^{-4}}\) | |
