Experiment	Measurement	Reference
BaBar	\([1.71 \pm 0.48\mbox{ (stat)} \pm 0.32\mbox{ (syst)}] \times 10^{-4}\)	PRD 77 011102 (2008)
Average	\(\mathbf{[1.71 \pm 0.58\mbox{ (combined)}] \times 10^{-4}}\)