Experiment	Measurement	Reference
BaBar	\([8.26 \pm 0.43\mbox{ (stat)} \pm 0.67\mbox{ (syst)}] \times 10^{-3}\)	PRD 83, 032004 (2011)
Average	\(\mathbf{[8.26 \pm 0.80\mbox{ (combined)}] \times 10^{-3}}\)