${{\mathit \Sigma}}$ 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:
B023

${{\mathit \Sigma}{(1480)}}$ Bumps

$I(J^P)$ = $1(?^{?})$ 
These are peaks seen in ${{\mathit \Lambda}}{{\mathit \pi}}$ and ${{\mathit \Sigma}}{{\mathit \pi}}$ spectra in the reaction ${{\mathit \pi}^{+}}$ ${{\mathit p}}$ $\rightarrow$ ( ${{\mathit Y}}{{\mathit \pi}}$ ) ${{\mathit K}^{+}}$ at 1.7 ${\mathrm {GeV/}}\mathit c$. Also, the ${{\mathit Y}}$ polarization oscillates in the same region. MILLER 1970 suggests a possible alternate explanation in terms of a reflection of ${{\mathit N}{(1675)}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit K}}$ decay. However, such an explanation for the ( ${{\mathit \Sigma}^{+}}{{\mathit \pi}^{0}}$ ) ${{\mathit K}^{+}}$ channel in terms of ${{\mathit \Delta}{(1650)}}$ $\rightarrow$ ${{\mathit \Sigma}}{{\mathit K}}$ decay seems unlikely (see PAN 1970). In addition such reflections would also have to account for the oscillation of the ${{\mathit Y}}$ polarization in the 1480 MeV region. HANSON 1971, with less data than PAN 1970, can neither confirm nor deny the existence of this state. MAST 1975 sees no structure in this region in ${{\mathit K}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \pi}^{0}}$. ENGELEN 1980 performs a multichannel analysis of ${{\mathit K}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}{{\overline{\mathit K}}^{0}}{{\mathit \pi}^{-}}$ at 4.2 ${\mathrm {GeV/}}\mathit c$. They observe a 3.5 standard-deviation signal at 1480 MeV in ${{\mathit p}}{{\overline{\mathit K}}^{0}}$ which cannot be explained as a reflection of any competing channel. PRAKHOV 2004 sees no evidence for this or other light ${{\mathit \Sigma}}$ resonances, aside from the ${{\mathit \Sigma}{(1385)}}$, in ${{\mathit K}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \pi}^{0}}{{\mathit \pi}^{0}}$. ZYCHOR 2006 finds peaks in ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit p}}{{\mathit K}^{+}}({{\mathit \pi}^{\pm}}{{\mathit X}^{\mp}}$) at $\mathit p_{{\mathrm {beam}}}$ = 3.65$~$GeV/c.