Experiment
Measurement
Reference
Belle
\([6.2 \pm 1.2\mbox{ (stat)} \pm 1.8\mbox{ (syst)}] \times 10^{-4}\)
PLB 553, 159 (2003)
Average
\(\mathbf{[6.2 \pm 2.2\mbox{ (combined)}] \times 10^{-4}}\)
