Experiment	Measurement	Reference
BaBar	\([5.46 \pm 1.17\mbox{ (stat)} \pm 1.04\mbox{ (syst)}] \times 10^{-4}\)	PRD 77 011102 (2008)
Average	\(\mathbf{[5.46 \pm 1.57\mbox{ (combined)}] \times 10^{-4}}\)