Experiment	Measurement	Reference
Belle	\([5.22 \pm 0.78\mbox{ (stat)} \pm 0.49\mbox{ (syst)}] \times 10^{-5}\)	PTEP 2014 (2014) 043C01
BaBar	\([0.84 \pm 0.26\mbox{ (stat)} \pm 0.27\mbox{ (syst)} \pm 0.02\mbox{ (psi/eta/k br (correlated))}] \times 10^{-4}\)	PRL 93 041801 (2004)
Average	\(\mathbf{[5.40 \pm 0.89\mbox{ (combined)}] \times 10^{-5}}\)