${{\boldsymbol \Sigma}}$ 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

${{\boldsymbol \Sigma}{(1620)}}$ Production Experiments $I(J^P)$ = $1(?^{?})$

Formation experiments are listed separately in the previous entry. The results of CRENNELL 1969B at 3.9 ${\mathrm {GeV/}}\mathit c$ are not confirmed by SABRE 1970 at 3.0 ${\mathrm {GeV/}}\mathit c$. However, at 4.5 ${\mathrm {GeV/}}\mathit c$, AMMANN 1970 sees a peak at 1642 MeV which on the basis of branching ratios they do not associate with the ${{\mathit \Sigma}{(1670)}}$. See MILLER 1970 for a review of these conflicts.
${{\mathit \Sigma}{(1620)}}$ MASS (PRODUCTION EXPERIMENTS)   $\approx1620$ MeV 
${{\mathit \Sigma}{(1620)}}$ WIDTH (PRODUCTION EXPERIMENTS)
$\Gamma_{1}$ ${{\mathit N}}{{\overline{\mathit K}}}$ 364
$\Gamma_{2}$ ${{\mathit \Lambda}}{{\mathit \pi}}$ 410
$\Gamma_{3}$ ${{\mathit \Sigma}}{{\mathit \pi}}$ 354
$\Gamma_{4}$ ${{\mathit \Lambda}}{{\mathit \pi}}{{\mathit \pi}}$ 358
$\Gamma_{5}$ ${{\mathit \Sigma}{(1385)}}{{\mathit \pi}}$ 181
$\Gamma_{6}$ ${{\mathit \Lambda}{(1405)}}{{\mathit \pi}}$ 156