Experiment	Measurement	Reference
CDF	\([0.045 ^{+0.017}_{-0.012}\mbox{ (stat)} \pm 0.004\mbox{ (syst)}] \times 10^{0}\)	PRD 80, 072003 (2009)
Average	\(\mathbf{[0.045 ^{+0.017}_{-0.013}\mbox{ (combined)}] \times 10^{0}}\)