Experiment	Measurement	Reference
Belle	\([1.21 \pm 0.34\mbox{ (stat)} \pm 0.22\mbox{ (syst)}] \times 10^{-4}\)	PRD 72, 011103(R) (2005)
BaBar	\([1.48 \pm 0.22\mbox{ (stat)} \pm 0.13\mbox{ (syst)}] \times 10^{-4}\)	PRD 84, 112007 (2011)
Average	\(\mathbf{[1.40 \pm 0.22\mbox{ (combined)}] \times 10^{-4}}\)