Measurement of branching fractions of J/ψ and ψ(3686) decays to Σ+ and <math> <mover> <mi>Σ</mi> <mo>¯</mo> </mover> </math> $$ \overline{\Sigma} $$ −

Using 1310.6 &#215; 106J/ψ and 448.1 &#215; 106ψ(3686) events collected with the BESIII detector, the branching fractions of J/ψ decays to Σ+$$ \overline{\Sigma} $$ Σ &#175; − is measured to be (10.61 &#177; 0.04 &#177; 0.36) &#215; 10−4, which is significantly more precise than the current world average. The branching fractions of ψ(3686) decays to Σ+$$ \overline{\Sigma} $$ Σ &#175; − is measured to be (2.52 &#177; 0.04 &#177; 0.09) &#215; 10−4, which is consistent with the previous measurements. In addition, the ratio of $$ \mathcal{B} $$ B (ψ(3686) → Σ+$$ \overline{\Sigma} $$ Σ &#175; −)/$$ \mathcal{B} $$ B (J/ψ → Σ+$$ \overline{\Sigma} $$ Σ &#175; −) is determined to be (23.8 &#177; 1.1)% which violates the “12% rule”.