Experiment	Measurement	Reference
BaBar	\([0.84 \pm 0.32\mbox{ (stat)} \pm 0.21\mbox{ (syst)}] \times 10^{-4}\)	PRD 77 011102 (2008)
Average	\(\mathbf{[0.84 \pm 0.38\mbox{ (combined)}] \times 10^{-4}}\)