Experiment	Measurement	Reference
LHCb	\([2.12 \pm 0.15\mbox{ (stat)} \pm 0.14\mbox{ (syst)} \pm 0.08\mbox{ (fs/fd)} \pm 0.08\mbox{ (PDG)}]\)	JHEP07(2014)140
Average	\(\mathbf{[2.12 \pm 0.23\mbox{ (combined)}]}\)