Experiment	Measurement	Reference
CDF	\([7.7 \pm 4.1\mbox{ (stat)} \pm 1.3\mbox{ (syst)}] \times 10^{-4}\)	PRL 88 071801 (2002)
Average	\(\mathbf{[7.7 \pm 4.3\mbox{ (combined)}] \times 10^{-4}}\)