| Experiment | Measurement | Reference |
|---|
| Belle | \([1.62 \pm 0.32\mbox{ (stat)} ^{+0.24}_{-0.34}\mbox{ (syst)} \pm 0.50\mbox{ (etac br (correlated))}] \times 10^{-3}\) | PRL 90, 071801(2003) |
| BaBar | \([5.7 \pm 0.6\mbox{ (stat)} \pm 0.4\mbox{ (syst)} \pm 0.8\mbox{ (BR(B- -> eta_c k-))}] \times 10^{-4}\) | PRD 78 012006 (2008) |
| BaBar | \([0.80 ^{+0.21}_{-0.19}\mbox{ (stat)} \pm 0.13\mbox{ (syst)} ^{+0.35}_{-0.19}\mbox{ (br)}] \times 10^{-3}\) | PRD 76 092004 (2007) |
| Average | \(\mathbf{[6.1 \pm 1.0\mbox{ (combined)}] \times 10^{-4}}\) | |
