Experiment	Measurement	Reference
BaBar	\([1.67 \pm 0.36\mbox{ (stat)} \pm 0.47\mbox{ (syst)}] \times 10^{-4}\)	PRD 77 011102 (2008)
Average	\(\mathbf{[1.67 \pm 0.59\mbox{ (combined)}] \times 10^{-4}}\)