Belle: INSPIRE
| Parameter | Measurement |
|---|---|
| \({\cal{B}} ( \bar{B}^0 \to J/\psi(1S) \eta K_S^0 )\) | \([5.22 \pm 0.78\mbox{ (stat)} \pm 0.49\mbox{ (syst)}] \times 10^{-5}\) |
| \({\cal{B}} ( B^- \to J/\psi(1S) \eta K^- )\) | \([1.27 \pm 0.11\mbox{ (stat)} \pm 0.11\mbox{ (syst)}] \times 10^{-4}\) |