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Search for the decay $B_s^0 \to \eta^\prime K_S^0$
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arxiv 2201.01851 v1 pith:T5KFJSCM submitted 2022-01-05 hep-ex
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abstract
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 upper limit of $8.16 \times 10^{-6}$ on the $B_s^0 \to \eta^\prime K_S^0$ branching fraction.
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