Experiment	Measurement	Reference
BaBar	\([4.55 \pm 0.16\mbox{ (stat)} \pm 0.39\mbox{ (syst)}] \times 10^{-4}\)	PRD 85, 092017 (2012)
Average	\(\mathbf{[4.55 \pm 0.42\mbox{ (combined)}] \times 10^{-4}}\)