Experiment	Measurement	Reference
BaBar	\([5.52 \pm 0.26\mbox{ (stat)} \pm 0.61\mbox{ (syst)}] \times 10^{-4}\)	PRD 85, 052003 (2012)
Average	\(\mathbf{[5.52 \pm 0.66\mbox{ (combined)}] \times 10^{-4}}\)