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

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

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

INSPIRE   PDGID:
S019A00
VALUE EVTS DOCUMENT ID TECN  COMMENT
$0.004$ $\pm0.037$ $\pm0.010$ 93k 1
ABLIKIM
2020X
 BES3 ${{\mathit J / \psi}}$ $/$ ${{\mathit \psi}{(2S)}}$ $\rightarrow$ ${{\mathit \Sigma}^{+}}{{\overline{\mathit \Sigma}}^{-}}$
1  ABLIKIM 2020X 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 87,815 and 5,327 events, respectively. Note that the reported values of decay parameters ${{\mathit \alpha}_{{0}}}$ of ${{\mathit \Sigma}^{+}}$ and ${{\overline{\mathit \alpha}}_{{0}}}$ of ${{\overline{\mathit \Sigma}}^{-}}$ are correlated.
References:
ABLIKIM 2020X
PRL 125 052004 $\Sigma^{+}$ and $\bar{\Sigma}^-$ polarization in the $J/\psi$ and $\psi(3686)$ decays