Experiment	Measurement	Reference
LHCb	\([4.4 \pm 1.7\mbox{ (stat)} ^{+0.6}_{-0.4}\mbox{ (syst)}] \times 10^{-2}\)	PRD 84 092001 (2011), Erratum: PRD 85 039904 (2012)
Average	\(\mathbf{[4.4 ^{+1.8}_{-1.7}\mbox{ (combined)}] \times 10^{-2}}\)