Experiment	Measurement	Reference
BaBar	\([0.474 \pm 0.013\mbox{ (stat)} \pm 0.054\mbox{ (syst)}] \times 10^{0}\)	PRD 85, 052003 (2012)
Average	\(\mathbf{[0.474 \pm 0.056\mbox{ (combined)}] \times 10^{0}}\)