JHEP 1311 (2013) 094
LHCb:
INSPIRE
Parameter
Measurement
\(\frac{{\cal{B}} ( B_c^{-} \to J/\psi K^{-} K^{+} \pi^{-} )} { {\cal{B}} ( B_c^{-} \to J/\psi \pi^{-} )}\)
\([0.53 \pm 0.10\mbox{ (stat)} \pm 0.05\mbox{ (syst)}]\)