Experiment	Measurement	Reference
BaBar	\([1.55 \pm 0.17\mbox{ (stat)} \pm 0.13\mbox{ (syst)}] \times 10^{-3}\)	PRD 83, 032004 (2011)
Average	\(\mathbf{[1.55 \pm 0.21\mbox{ (combined)}] \times 10^{-3}}\)