Experiment	Measurement	Reference
Belle	\([2.60 \pm 0.47\mbox{ (stat)} \pm 0.37\mbox{ (syst)}] \times 10^{-3}\)	PRD (R)70,111103(2004)
Average	\(\mathbf{[2.60 \pm 0.60\mbox{ (combined)}] \times 10^{-3}}\)