Belle II measures B(B+→τ+ντ) = (1.24 ± 0.41 ± 0.19) × 10^-4 from 365 fb^-1 of data, finding 3.0 sigma evidence for the decay.
Measurement of B+ → τ +ντ branching fraction with a hadronic tagging method at Belle II
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$\mathcal{B}(B\rightarrow\tau\nu)$ measurement with the hadronic FEI at Belle~II
Belle II measures B(B+→τ+ντ) = (1.24 ± 0.41 ± 0.19) × 10^-4 from 365 fb^-1 of data, finding 3.0 sigma evidence for the decay.