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), Phys
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Flux-averaged cross sections for n-bar p to K+K-pi+ and K+K-pi+pi0 are measured as 0.53 and 1.09 mb using tagged antineutrons from J/psi decays.
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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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Cross Section Measurements of $\bar{n}p \rightarrow K^{+}K^{-}\pi^{+}(\pi^{0})$ via Antineutrons Produced by $J/\psi \to p \pi^{-} \bar{n}$ Decays
Flux-averaged cross sections for n-bar p to K+K-pi+ and K+K-pi+pi0 are measured as 0.53 and 1.09 mb using tagged antineutrons from J/psi decays.