Experiment
Measurement
Reference
LHCb
\([4.0 \pm 0.7\mbox{ (stat)} \pm 0.5\mbox{ (syst)}] \times 10^{-2}\)
PRD 84 092001 (2011), Erratum: PRD 85 039904 (2012)
Average
\(\mathbf{[4.0 \pm 0.9\mbox{ (combined)}] \times 10^{-2}}\)