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.
Ablikimet al.(BESIII Collaboration), Nature606, 64 (2022)
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BESIII reports 4.4σ evidence for transverse Ξ⁰ polarization in ψ(3686)→Ξ⁰Ξ⁰-bar together with improved measurements of branching fraction, decay amplitudes, and CP observables consistent with no violation.
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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.
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Evidence of transverse polarization of $\Xi^0$ hyperon in $\psi(3686)\rightarrow\Xi^0\bar{\Xi}^0$
BESIII reports 4.4σ evidence for transverse Ξ⁰ polarization in ψ(3686)→Ξ⁰Ξ⁰-bar together with improved measurements of branching fraction, decay amplitudes, and CP observables consistent with no violation.