Experiment	Measurement	Reference
LHCb	\([4.7 \pm 0.7\mbox{ (stat)} \pm 0.4\mbox{ (syst)} \pm 0.6\mbox{ (PDG)}] \times 10^{-4}\)	JHEP07(2014)140
Average	\(\mathbf{[4.7 \pm 1.0\mbox{ (combined)}] \times 10^{-4}}\)