Experiment	Measurement	Reference
BaBar	\([3.32 \pm 0.88\mbox{ (stat)} \pm 0.66\mbox{ (syst)}] \times 10^{-4}\)	PRD 77 011102 (2008)
Average	\(\mathbf{[3.32 \pm 1.10\mbox{ (combined)}] \times 10^{-4}}\)