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We perform the investigation of two-body hidden-bottom transitions of the$\Upsilon(6S)$, which include $\Upsilon(6S) \to \Upsilon(1^3D_J)\eta~~(J=1,2,3)$ decays. For estimating the branching ratios of theseprocesses, we consider contributions from the triangle hadronic loops composedof S-wave $B_{(s)}$ and $B_{(s)}^*$ mesons, which are a bridge to connect the$\Upsilon(6S)$ and final states. Our results show that both of the branchingratios of these decays can reach $10^{-3}$. Due to such considerable potentialto observe these two-body hidden-bottom transitions of the $\Upsilon(6S)$, wesuggest the forthcoming Belle II experiment to explore them.

Potential observation of the $\Upsilon(6S) \to \Upsilon(1^3D_J) \eta$ transitions at Belle II