Experiment	Measurement	Reference
BaBar	\([2.26 \pm 0.16\mbox{ (stat)} \pm 0.17\mbox{ (syst)}] \times 10^{-3}\)	PRD 83, 032004 (2011)
Average	\(\mathbf{[2.26 \pm 0.23\mbox{ (combined)}] \times 10^{-3}}\)