Experiment	Measurement	Reference
Belle	\([5.52 ^{+0.35}_{-0.32}\mbox{ (stat)} ^{+0.53}_{-0.58}\mbox{ (syst)}] \times 10^{-4}\)	PRD 80, 031104(R) (2009)
Average	\(\mathbf{[5.52 ^{+0.64}_{-0.66}\mbox{ (combined)}] \times 10^{-4}}\)