Experiment	Measurement	Reference
BaBar	\([0.62 \pm 0.06\mbox{ (stat)} \pm 0.05\mbox{ (syst)}] \times 10^{0}\)	PRD 78 012006 (2008)
Average	\(\mathbf{[0.62 \pm 0.08\mbox{ (combined)}] \times 10^{0}}\)