Experiment	Measurement	Reference
CDF	\([5.4 \pm 2.9\mbox{ (stat)} \pm 0.9\mbox{ (syst)}] \times 10^{-4}\)	PRL 88 071801 (2002)
Average	\(\mathbf{[5.4 \pm 3.0\mbox{ (combined)}] \times 10^{-4}}\)