| Parameter | Measurement |
|---|---|
| \(\frac{{\cal{B}} ( B^{-} \to J/\psi \pi^{-} )}{{\cal{B}} ( B^{-} \to J/\psi K^{-} )}\) | \([0.0537 \pm 0.0045\mbox{ (stat)} \pm 0.0011\mbox{ (syst)}]\) |
| \({\cal{B}} ( B^{-} \to J/\psi \pi^{-} )\) | \([0.537 \pm 0.045\mbox{ (stat)} \pm 0.024\mbox{ (syst)}] \times 10^{-4}\) |