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We report the results of the first search for the decay $B_s^0 \to\eta^\prime K_S^0$ using $121.4\,{\rm fb}^{-1}$ of data collected at the$\Upsilon(5S)$ resonance with the Belle detector at the KEKB asymmetric-energy$e^+ e^-$ collider. We observe no signal and set a 90\% confidence-level upperlimit of $8.16 \times 10^{-6}$ on the $B_s^0 \to \eta^\prime K_S^0$ branchingfraction.

Search for the decay $B_s^0 \to \eta^\prime K_S^0$