Experiment	Measurement	Reference
Belle	\([4.0 ^{+2.3}_{-0.9}\mbox{ (stat)} ^{+19.7}_{-0.5}\mbox{ (syst)}] \times 10^{-5}\)	PRD 78:072004,2008
Average	\(\mathbf{[4.0 ^{+19.8}_{-1.0}\mbox{ (combined)}] \times 10^{-5}}\)