| Experiment | Measurement | Reference |
|---|---|---|
| BaBar | \([1.21 ^{+0.43}_{-0.35}\mbox{ (stat)} ^{+0.34}_{-0.28}\mbox{ (syst)} ^{+0.54}_{-0.28}\mbox{ (br)}] \times 10^{-3}\) | PRD 76 092004 (2007) |
| Average | \(\mathbf{[1.21 ^{+0.77}_{-0.53}\mbox{ (combined)}] \times 10^{-3}}\) |