Experiment	Measurement	Reference
Belle	\([2.9 \pm 1.0\mbox{ (stat)} \pm 0.4\mbox{ (syst)}] \times 10^{-4}\)	PLB 553, 159 (2003)
Average	\(\mathbf{[2.9 \pm 1.1\mbox{ (combined)}] \times 10^{-4}}\)