${{\boldsymbol \Sigma}}$ 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

${{\boldsymbol \Sigma}{(1750)}}$ $I(J^P)$ = $1(1/2^{-})$ 

For most results published before 1974 (they are now obsolete), see our 1982 edition Physics Letters 111B 1 (1982). There is evidence for this state in many partial-wave analyses, but with wide variations in the mass, width, and couplings. The latest analyses indicated significant couplings to ${{\mathit N}}{{\overline{\mathit K}}}$ and ${{\mathit \Lambda}}{{\mathit \pi}}$ , as well as to ${{\mathit \Sigma}}{{\mathit \eta}}$ whose threshold is at 1746 MeV (JONES 1974 ).
${{\boldsymbol \Sigma}{(1750)}}$ POLE POSITION
REAL PART
$-2{\times }$IMAGINARY PART
${{\boldsymbol \Sigma}{(1750)}}$ POLE RESIDUES
Normalized residue in ${{\mathit N}}$ ${{\overline{\mathit K}}}$ $\rightarrow$ ${{\mathit \Sigma}{(1750)}}$ $\rightarrow$ ${{\mathit N}}{{\overline{\mathit K}}}$
Normalized residue in ${{\mathit N}}$ ${{\overline{\mathit K}}}$ $\rightarrow$ ${{\mathit \Sigma}{(1750)}}$ $\rightarrow$ ${{\mathit \Sigma}}{{\mathit \pi}}$
Normalized residue in ${{\mathit N}}$ ${{\overline{\mathit K}}}$ $\rightarrow$ ${{\mathit \Sigma}{(1750)}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \pi}}$
Normalized residue in ${{\mathit N}}$ ${{\overline{\mathit K}}}$ $\rightarrow$ ${{\mathit \Sigma}{(1750)}}$ $\rightarrow$ ${{\mathit \Sigma}{(1385)}}{{\mathit \pi}}$ , ${\mathit D}{\mathrm -wave}$
${{\mathit \Sigma}{(1750)}}$ MASS   $1730\text{ to }1800\text{ }(\approx1750) $ MeV 
${{\mathit \Sigma}{(1750)}}$ WIDTH   $60\text{ to }160\text{ }(\approx90) $ MeV 
$\Gamma_{1}$ ${{\mathit N}}{{\overline{\mathit K}}}$ 10$-40\%$486
$\Gamma_{2}$ ${{\mathit \Lambda}}{{\mathit \pi}}$ seen507
$\Gamma_{3}$ ${{\mathit \Sigma}}{{\mathit \pi}}$ $<8\%$456
$\Gamma_{4}$ ${{\mathit \Sigma}}{{\mathit \eta}}$ 15$-55\%$98
$\Gamma_{5}$ ${{\mathit \Sigma}{(1385)}}{{\mathit \pi}}$ , ${\mathit D}{\mathrm -wave}$ 305
$\Gamma_{6}$ ${{\mathit \Lambda}{(1520)}}{{\mathit \pi}}$ 174
$\Gamma_{7}$ ${{\mathit N}}{{\overline{\mathit K}}^{*}{(892)}}$ , $\mathit S$=1/2 $(8\pm{4})\%$-1
$\Gamma_{8}$ ${{\mathit N}}{{\overline{\mathit K}}^{*}{(892)}}$ , $\mathit S$=3/2, ${\mathit D}{\mathrm -wave}$ -1