Experiment	Measurement	Reference
BaBar	\([2.3 \pm 0.3\mbox{ (stat)} \pm 0.3\mbox{ (syst)}] \times 10^{-4}\)	PRD(RC) 82 011101 (2010)
Average	\(\mathbf{[2.3 \pm 0.4\mbox{ (combined)}] \times 10^{-4}}\)