First observation of Λ(1520)→γΣ⁰ and Λ(1670)→γΣ⁰ decays with branching fraction measurements that agree with SU(3) symmetry but disagree with some quark model predictions.
Ablikimet al.(BESIII Collaboration), Phys
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First absolute branching fractions for Σ⁺ → p π⁰ and Σ⁺ → n π⁺ measured at 49.79% and 49.87%, deviating from PDG values and showing >5σ evidence for ΔI=3/2 amplitudes.
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Observation of the electromagnetic radiative decays of the \boldmath{$\Lambda(1520)$} and \boldmath{$\Lambda(1670)$} to \boldmath{$\gamma\Sigma^0$}
First observation of Λ(1520)→γΣ⁰ and Λ(1670)→γΣ⁰ decays with branching fraction measurements that agree with SU(3) symmetry but disagree with some quark model predictions.
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First measurement of the absolute branching fractions of $\Sigma^+$ nonleptonic decays and test of the $\Delta I = 1/2$ rule
First absolute branching fractions for Σ⁺ → p π⁰ and Σ⁺ → n π⁺ measured at 49.79% and 49.87%, deviating from PDG values and showing >5σ evidence for ΔI=3/2 amplitudes.