${{\boldsymbol \Sigma}}$ BARYONS($\boldsymbol S$ = $-1$, $\boldsymbol I$ = 1) ${{\mathit \Sigma}^{+}}$ = ${\mathit {\mathit u}}$ ${\mathit {\mathit u}}$ ${\mathit {\mathit s}}$, ${{\mathit \Sigma}^{0}}$ = ${\mathit {\mathit u}}$ ${\mathit {\mathit d}}$ ${\mathit {\mathit s}}$, ${{\mathit \Sigma}^{-}}$ = ${\mathit {\mathit d}}$ ${\mathit {\mathit d}}$ ${\mathit {\mathit s}}$ INSPIRE search

# ${{\boldsymbol \Sigma}{(1580)}}$ $I(J^P)$ = $1(3/2^{-})$

Seen in the isospin-$1{}^{}{}^{}$ ${{\overline{\mathit K}}}{{\mathit N}}$ cross section at BNL (LI 1973 , CARROLL 1976 ) and in a partial-wave analysis of ${{\mathit K}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \pi}^{0}}$ for c.m. energies 1560$-$1600 MeV by LITCHFIELD 1974 . LITCHFIELD 1974 finds $\mathit J{}^{P} = 3/2{}^{-}$. Not seen by ENGLER 1978 or by CAMERON 1978C (with larger statistics in ${{\mathit K}_L^0}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \pi}^{+}}$ and ${{\mathit \Sigma}^{0}}{{\mathit \pi}^{+}}$ ). Neither OLMSTED 2004 (in ${{\mathit K}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \pi}^{0}}$ ) nor PRAKHOV 2004 (in ${{\mathit K}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \pi}^{0}}{{\mathit \pi}^{0}}$ ) see any evidence for this state.
${{\boldsymbol \Sigma}{(1580)}}$ POLE POSITION
 REAL PART
 $-2{\times }$IMAGINARY PART
${{\boldsymbol \Sigma}{(1580)}}$ POLE RESIDUES
 Normalized residue in ${{\mathit N}}$ ${{\overline{\mathit K}}}$ $\rightarrow$ ${{\mathit \Sigma}{(1580)}}$ $\rightarrow$ ${{\mathit N}}{{\overline{\mathit K}}}$
 Normalized residue in ${{\mathit N}}$ ${{\overline{\mathit K}}}$ $\rightarrow$ ${{\mathit \Sigma}{(1580)}}$ $\rightarrow$ ${{\mathit \Sigma}}{{\mathit \pi}}$
 Normalized residue in ${{\mathit N}}$ ${{\overline{\mathit K}}}$ $\rightarrow$ ${{\mathit \Sigma}{(1580)}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \pi}}$
 Normalized residue in ${{\mathit N}}$ ${{\overline{\mathit K}}}$ $\rightarrow$ ${{\mathit \Sigma}{(1580)}}$ $\rightarrow$ ${{\mathit \Sigma}{(1385)}}{{\mathit \pi}}$ , ${\mathit S}{\mathrm -wave}$
 Normalized residue in ${{\mathit N}}$ ${{\overline{\mathit K}}}$ $\rightarrow$ ${{\mathit \Sigma}{(1580)}}$ $\rightarrow$ ${{\mathit \Sigma}{(1385)}}{{\mathit \pi}}$ , ${\mathit D}{\mathrm -wave}$
 ${{\mathit \Sigma}{(1580)}}$ MASS $\approx1580$ MeV
 ${{\mathit \Sigma}{(1580)}}$ WIDTH