Experiment	Measurement	Reference
CDF	\([0.108 \pm 0.044\mbox{ (stat)} ^{+0.042}_{-0.036}\mbox{ (syst)}] \times 10^{0}\)	PRD 79, 032001 (2009)
Average	\(\mathbf{[0.108 ^{+0.061}_{-0.057}\mbox{ (combined)}] \times 10^{0}}\)