LHCb
LHCb (unpublished):
link
Parameter
Measurement
\(\frac{{\cal{B}} ( B_c^- \to J/\psi \pi^+ \pi^- \pi^- )} {{\cal{B}} ( B_c^- \to J/\psi \pi^- )}\)
\([3.0 \pm 0.6\mbox{ (stat)} \pm 0.4\mbox{ (syst)}] \times 10^{0}\)