Search for the decay $B_s^0\to J\mathrm{/}\psi {\pi }^0$ at Belle experiment

We have analyzed 121.4 fb${}^{-1}$ of data collected at the $\mathrm{{\rm Y}}(5S)$ resonance by the Belle experiment using the KEKB asymmetric-energy $e^{+}{e}^{-}$ collider to search for the decay $B_s^0\to J\mathrm{/}\psi {\pi }^0$. We observe no signal and report an upper limit on the branching fraction $\mathcal{B}(B_s^0\to J\mathrm{/}\psi {\pi }^0)$ of $1.21\times {10}^{-5}$ at 90% confidence level. This result is the most stringent, improving the previous bound by two orders of magnitude.