Experiment	Measurement	Reference
CDF	\([0.93 \pm 0.28\mbox{ (stat)} \pm 0.17\mbox{ (syst)}] \times 10^{-3}\)	PRD 54 6596 (1996)
Average	\(\mathbf{[0.93 \pm 0.33\mbox{ (combined)}] \times 10^{-3}}\)