Experiment	Measurement	Reference
BaBar	\([1.22 \pm 0.13\mbox{ (stat)} \pm 0.23\mbox{ (syst)}] \times 10^{0}\)	PRD 74 111102 (2006)
Average	\(\mathbf{[1.22 \pm 0.26\mbox{ (combined)}] \times 10^{0}}\)