Experiment	Measurement	Reference
BaBar	\([0.30 \pm 0.06\mbox{ (stat)} \pm 0.02\mbox{ (syst)}] \times 10^{0}\)	PRD 76 031102 (2007)
Average	\(\mathbf{[0.30 \pm 0.06\mbox{ (combined)}] \times 10^{0}}\)