LHCb
LHCb (unpublished):
link
Parameter
Measurement
\(\frac{{\sigma(B_c^-) \times \cal{B}} ( B_c^- \to J/\psi \pi^- )} {\sigma(B^-) \times {\cal{B}} ( B^- \to J/\psi K^- )}\)
\([2.2 \pm 0.8\mbox{ (stat)} \pm 0.2\mbox{ (syst)}] \times 10^{-2}\)