PRL 77 5176 (1996)

CDF: INSPIRE

ParameterMeasurement
\(\frac{{\cal{B}} ( B^- \to J/\psi(1S) \pi^- )}{{\cal{B}} ( B^- \to J/\psi(1S) K^- )}\)\([0.050 ^{+0.019}_{-0.017}\mbox{ (stat)} \pm 0.001\mbox{ (syst)}] \times 10^{0}\)