Experiment	Measurement	Reference
Belle	\([4.3 \pm 0.8\mbox{ (stat)} \pm 0.3\mbox{ (syst)}] \times 10^{-2}\)	PRD(RC) 74, 051103 (2006)
Average	\(\mathbf{[4.3 \pm 0.9\mbox{ (combined)}] \times 10^{-2}}\)