${{\mathit \Sigma}^{+}}$ DECAY PARAMETERS

See the ``Note on Baryon Decay Parameters'' in the neutron Listings. A few early results have been omitted.

(${{\mathit \alpha}_{{{0}}}}$ $−$ ${{\overline{\mathit \alpha}}_{{{0}}}}$)/2

INSPIRE   JSON  (beta) PDGID:
S019A04
Average decay parameter assuming $\mathit CP$ conservation.
S019A04
VALUE EVTS DOCUMENT ID TECN  COMMENT
$-0.9869$ $\pm0.0011$ $\pm0.0016$ 1.07M 1
ABLIKIM
2025BT
 
BES3 ${{\mathit J / \psi}}$ $/$ ${{\mathit \psi}{(2S)}}$ $\rightarrow$ ${{\mathit \Sigma}^{+}}{{\overline{\mathit \Sigma}}^{-}}$
1  ABLIKIM 2025BT uses production through ${{\mathit e}^{+}}$ ${{\mathit e}}$ $\rightarrow$ ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \Sigma}^{+}}{{\overline{\mathit \Sigma}}^{-}}$ and ${{\mathit e}^{+}}$ ${{\mathit e}}$ $\rightarrow$ ${{\mathit \psi}{(2S)}}$ $\rightarrow$ ${{\mathit \Sigma}^{+}}{{\overline{\mathit \Sigma}}^{-}}$, with $1016678$ $\pm1398$ and $53293$ $\pm299$ events, respectively.
References