PRL 77 5176 (1996)

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