Experiment	Measurement	Reference
CDF	\([0.210 \pm 0.042\mbox{ (stat)} ^{+0.071}_{-0.050}\mbox{ (syst)}] \times 10^{0}\)	PRD 79, 032001 (2009)
Average	\(\mathbf{[0.210 ^{+0.082}_{-0.065}\mbox{ (combined)}] \times 10^{0}}\)