First measurement of the absolute branching fractions of $\hat{I}{\pounds }^{+}$ nonleptonic decays and test of the $\hat{I}”I=1/2$ rule

BESIII Collaboration, M. Ablikim, M. N. Achasov +689

The paper reports the first absolute measurements of the branching fractions for the Σ⁺ → p π⁰ and Σ⁺ → n π⁺ decays using BESIII J/ψ data, and tests the ΔI = 1/2 rule in Σ hyperon…