Experiment	Measurement	Reference
BaBar	\([4.1 \pm 1.2\mbox{ (stat)} \pm 1.0\mbox{ (syst)} \pm 0.4\mbox{ (correlated syst)}] \times 10^{-4}\)	PRD 74 (2006) 012001
Average	\(\mathbf{[4.1 \pm 1.6\mbox{ (combined)}] \times 10^{-4}}\)