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${{\mathit \Sigma}}$ 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).

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▸  exp ${{\mathit \Sigma}{(1660)}}$ POLE POSITION

REAL PART $1585$ $\pm20$ MeV

$-2{\times }$IMAGINARY PART $290^{+140}_{-40}$ MeV

▸  exp ${{\mathit \Sigma}{(1660)}}$ 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 TO 1680 $(\approx 1660 )$ MeV

${{\mathit \Sigma}{(1660)}}$ WIDTH 100 TO 300 $(\approx 200 )$ MeV

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

Mode   Fraction ($\Gamma_i$ / $\Gamma$) Scale Factor/ Conf. Level P(MeV/c)   $\Gamma_{1}$ ${{\mathit N}}{{\overline{\mathit K}}}$ 0.05 TO 0.15 $(\approx 0.10 )$ 405   $\Gamma_{2}$ ${{\mathit \Lambda}}{{\mathit \pi}}$ ($35$ $\pm12$ ) $\%$ 440   $\Gamma_{3}$ ${{\mathit \Sigma}}{{\mathit \pi}}$ ($37$ $\pm10$ ) $\%$ 387   $\Gamma_{4}$ ${{\mathit \Sigma}}{{\mathit \sigma}}$ ($20$ $\pm8$ ) $\%$     $\Gamma_{5}$ ${{\mathit \Sigma}{(1385)}}{{\mathit \pi}}$ 222   $\Gamma_{6}$ ${{\mathit \Lambda}{(1405)}}{{\mathit \pi}}$ ($4.0$ $\pm2.0$ ) $\%$ 199   $\Gamma_{7}$ ${{\mathit \Lambda}{(1520)}}{{\mathit \pi}}$ 39