Experiment	Measurement	Reference
BaBar	\([1.66 \pm 0.13\mbox{ (stat)} \pm 0.27\mbox{ (syst)}] \times 10^{-4}\)	PRD 85, 092017 (2012)
Average	\(\mathbf{[1.66 \pm 0.30\mbox{ (combined)}] \times 10^{-4}}\)