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Measurements of electroweak penguin $B$ decays with missing energy at Belle and Belle II
Electroweak penguin $B$ decays with neutrinos or $τ$ leptons in the final state are sensitive probes of physics beyond the Standard Model. Using the full Belle and Run 1 Belle II datasets, the first search for $B^0 \to K^0_Sτ^+τ^-$ sets the upper limit on the branching fraction to $\mathcal{B} < 8.3
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