Experiment
Measurement
Reference
Belle
\([3.97 \pm 0.85\mbox{ (stat)} \pm 0.56\mbox{ (syst)}] \times 10^{-4}\)
PRD 83, 051102(R) (2011)
Average
\(\mathbf{[3.97 \pm 1.02\mbox{ (combined)}] \times 10^{-4}}\)
