Experiment	Measurement	Reference
Belle	\([3.78 ^{+0.17}_{-0.16}\mbox{ (stat)} \pm 0.33\mbox{ (syst)}] \times 10^{-4}\)	PRL 107, 091803 (2011)
BaBar	\([4.2 \pm 0.3\mbox{ (stat)} \pm 0.3\mbox{ (syst)}] \times 10^{-4}\)	PRL 102 132001 (2009)
Average	\(\mathbf{[3.96 \pm 0.28\mbox{ (combined)}] \times 10^{-4}}\)