Experiment	Measurement	Reference
BaBar	\([2.61 \pm 1.03\mbox{ (stat)} \pm 0.31\mbox{ (syst)}] \times 10^{-4}\)	PRD 77 011102 (2008)
Average	\(\mathbf{[2.61 \pm 1.08\mbox{ (combined)}] \times 10^{-4}}\)