Experiment	Measurement	Reference
Belle	\([2.2 \pm 0.4\mbox{ (stat)} \pm 0.3\mbox{ (syst)}] \times 10^{-5}\)	PRD(RC) 74, 051103 (2006)
Average	\(\mathbf{[2.2 \pm 0.5\mbox{ (combined)}] \times 10^{-5}}\)