Experiment	Measurement	Reference
BaBar	\([2.67 \pm 0.61\mbox{ (stat)} \pm 0.47\mbox{ (syst)}] \times 10^{-4}\)	PRD 74 (2006) 031103
Average	\(\mathbf{[2.67 \pm 0.77\mbox{ (combined)}] \times 10^{-4}}\)