${{\boldsymbol \Sigma}}$ 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

${{\boldsymbol \Sigma}{(3170)}}$ Bumps $I(J^P)$ = $1(?^{?})$

Seen by AMIRZADEH 1979 as a narrow 6.5-standard-deviation enhancement in the reaction ${{\mathit K}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit Y}^{*+}}{{\mathit \pi}^{-}}$ using data from independent high statistics bubble chamber experiments at 8.25 and 6.5 ${\mathrm {GeV/}}\mathit c$. The dominant decay modes are multibody, multistrange final states and the production is via isospin-${}^{}3/2{}^{}$ baryon exchange. Isospin ${}^{}1{}^{}$ is favored. Not seen in a ${{\mathit K}^{-}}{{\mathit p}}$ experiment in LASS at 11 ${\mathrm {GeV/}}\mathit c$ (ASTON 1985B).

${{\mathit \Sigma}{(3170)}}$ MASS (PRODUCTION EXPERIMENTS)

$\approx3170$ MeV

${{\mathit \Sigma}{(3170)}}$ WIDTH (PRODUCTION EXPERIMENTS)

Decay Modes

$\Gamma_{1}$

${{\mathit \Lambda}}{{\mathit K}}{{\overline{\mathit K}}}$

seen

$\Gamma_{2}$

${{\mathit \Sigma}}{{\mathit K}}{{\overline{\mathit K}}}$

seen

$\Gamma_{3}$

${{\mathit \Xi}}{{\mathit K}}$

seen