Experiment	Measurement	Reference
LHCb	\([0.25 \pm 0.07\mbox{ (stat)} \pm 0.01\mbox{ (syst)} \pm 0.01\mbox{ (R(psi))}]\)	PRD 87, 071103(R) (2013)
Average	\(\mathbf{[0.25 \pm 0.07\mbox{ (combined)}]}\)