Experiment	Measurement	Reference
LHCb	\([0.268 \pm 0.032\mbox{ (stat)} \pm 0.007\mbox{ (syst)} \pm 0.006\mbox{ (R(psi))}]\)	LHCb-PAPER-2015-024
Average	\(\mathbf{[0.268 \pm 0.033\mbox{ (combined)}]}\)