Experiment	Measurement	Reference
BaBar	\([2.40 \pm 0.55\mbox{ (stat)} \pm 0.67\mbox{ (syst)}] \times 10^{-3}\)	PRD 83, 032004 (2011)
Average	\(\mathbf{[2.40 \pm 0.87\mbox{ (combined)}] \times 10^{-3}}\)