LHCb
LHCb (unpublished):
link
Parameter
Measurement
\(\frac{{\cal{B}} ( B^- \to J/\psi(1S) \pi^- )}{{\cal{B}} ( B^- \to J/\psi(1S) K^- )}\)
\([3.94 \pm 0.39\mbox{ (stat)} \pm 0.17\mbox{ (syst)}] \times 10^{-2}\)