Experiment	Measurement	Reference
LHCb	\([1.27 \pm 0.06\mbox{ (stat)} \pm 0.11\mbox{ (syst)}] \times 10^{0}\)	PRD 84 092001 (2011), Erratum: PRD 85 039904 (2012)
Average	\(\mathbf{[1.27 \pm 0.13\mbox{ (combined)}] \times 10^{0}}\)