ExperimentMeasurementReference
BaBar\([8.1 \pm 1.2\mbox{ (stat)} \pm 1.1\mbox{ (syst)} \pm 0.6\mbox{ (correlated syst)}] \times 10^{-4}\)PRD 73(2006) 112004
Average \(\mathbf{[8.1 \pm 1.7\mbox{ (combined)}] \times 10^{-4}}\)