${{\mathit \Sigma}}$ BARYONS
($\mathit S$ = $-1$, $\mathit I$ = 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   JSON PDGID:
B079

${{\mathit \Sigma}{(1660)}}$

$I(J^P)$ = $1(1/2^{+})$ 
For results published before 1974 (they are now obsolete), see our 1982 edition Physics Letters 111B 1 (1982).
${{\mathit \Sigma}{(1660)}}$ POLE POSITION
REAL PART   $1585 \pm20$ MeV 
 
$-2{\times }$IMAGINARY PART   $290 {}^{+140}_{-40}$ MeV 
 
${{\mathit \Sigma}{(1660)}}$ POLE RESIDUES
Normalized residue in ${{\mathit N}}$ ${{\overline{\mathit K}}}$ $\rightarrow$ ${{\mathit \Sigma}{(1660)}}$ $\rightarrow$ ${{\mathit N}}{{\overline{\mathit K}}}$   $0.07 \pm0.03$  
 
Normalized residue in ${{\mathit N}}$ ${{\overline{\mathit K}}}$ $\rightarrow$ ${{\mathit \Sigma}{(1660)}}$ $\rightarrow$ ${{\mathit \Sigma}}{{\mathit \pi}}$   $0.17 \pm0.04$  
 
Normalized residue in ${{\mathit N}}$ ${{\overline{\mathit K}}}$ $\rightarrow$ ${{\mathit \Sigma}{(1660)}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \pi}}$   $0.16 \pm0.05$  
 
Normalized residue in ${{\mathit N}}$ ${{\overline{\mathit K}}}$ $\rightarrow$ ${{\mathit \Sigma}{(1660)}}$ $\rightarrow$ ${{\mathit \Sigma}}{{\mathit \sigma}}$   $0.14 \pm0.06$  
 
Normalized residue in ${{\mathit N}}$ ${{\overline{\mathit K}}}$ $\rightarrow$ ${{\mathit \Sigma}{(1660)}}$ $\rightarrow$ ${{\mathit \Sigma}{(1385)}}{{\mathit \pi}}$
Normalized residue in ${{\mathit N}}$ ${{\overline{\mathit K}}}$ $\rightarrow$ ${{\mathit \Sigma}{(1660)}}$ $\rightarrow$ ${{\mathit \Lambda}{(1405)}}{{\mathit \pi}}$   $0.06 \pm0.03$  
 
Normalized residue in ${{\mathit N}}$ ${{\overline{\mathit K}}}$ $\rightarrow$ ${{\mathit \Sigma}{(1660)}}$ $\rightarrow$ ${{\mathit \Lambda}{(1520)}}{{\mathit \pi}}$   $0.04 \pm0.02$  
 
${{\mathit \Sigma}{(1660)}}$ MASS   $1640\text{ to }1680\text{ }(\approx1660) $ MeV 
 
${{\mathit \Sigma}{(1660)}}$ WIDTH   $100\text{ to }300\text{ }(\approx200) $ MeV 
 
$\Gamma_{1}$ ${{\mathit N}}{{\overline{\mathit K}}}$   0.05 to 010 to 0.15 405
 
$\Gamma_{2}$ ${{\mathit \Lambda}}{{\mathit \pi}}$   $(35\pm{12})\%$ 440
 
$\Gamma_{3}$ ${{\mathit \Sigma}}{{\mathit \pi}}$   $(37\pm{10})\%$ 387
 
$\Gamma_{4}$ ${{\mathit \Sigma}}{{\mathit \sigma}}$   $(20\pm{8})\%$  
 
$\Gamma_{5}$ ${{\mathit \Sigma}{(1385)}}{{\mathit \pi}}$   222
 
$\Gamma_{6}$ ${{\mathit \Lambda}{(1405)}}{{\mathit \pi}}$   $(4.0\pm{2.0})\%$ 199
 
$\Gamma_{7}$ ${{\mathit \Lambda}{(1520)}}{{\mathit \pi}}$   39
 
FOOTNOTES