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We report the first observation of $B_s^0\to J/\psi\eta$ and evidence for$B_s^0\to J/\psi\eta'$. These results are obtained from $23.6 \mathrm{fb}^{-1}$of data collected at the $\Upsilon(5S)$ resonance with the Belle detector atthe KEKB $e^+e^-$ collider. We measure the branching fractions$\mathcal{B}(B_s^0\to J/\psi\eta)= (3.32 \pm0.87(\mathrm{stat.})^{+0.32}_{-0.28}(\mathrm{syst.}) \pm 0.42(f_s))\times10^{-4}}$ with a significance of $7.3 \sigma$, and $\mathcal{B}(B_s^0\toJ/\psi\eta')= (3.1 \pm 1.2(\mathrm{stat.})^{+0.5}_{-0.6}(\mathrm{syst.}) \pm0.38(f_s))\times 10^{-4}$ with a significance of $3.8 \sigma$.

Observation of the decay $B_s^0\to J/\psi\eta$ and Evidence for $B_s^0\to J/\psi\eta'$