Experiment	Measurement	Reference
BaBar	\([1.34 \pm 0.19\mbox{ (stat)} \pm 0.13\mbox{ (syst)} \pm 0.38\mbox{ (etac br (correlated))}]\)	PRD 70 011101 (2004)
Average	\(\mathbf{[1.34 \pm 0.44\mbox{ (combined)}]}\)