${{\boldsymbol \Lambda}}$ BARYONS
($\boldsymbol S$ = $-1$, $\boldsymbol I$ = 0)
${{\mathit \Lambda}^{0}}$ = ${\mathit {\mathit u}}$ ${\mathit {\mathit d}}$ ${\mathit {\mathit s}}$

INSPIRE search

${{\boldsymbol \Lambda}{(2085)}}$ $I(J^P)$ = $0(7/2^{+})$

was ${{\mathit \Lambda}{(2020)}}$

In LITCHFIELD 1971 , need for the state rests solely on a possibly inconsistent polarization measurement at 1.784 ${\mathrm {GeV/}}\mathit c$. HEMINGWAY 1975 does not require this state. GOPAL 1977 does not need it in either ${{\mathit N}}{{\overline{\mathit K}}}$ or ${{\mathit \Sigma}}{{\mathit \pi}}$ . With new ${{\mathit K}^{-}}{{\mathit n}}$ angular distributions included, DECLAIS 1977 sees it. However, this and other new data are included in GOPAL 1980 and the state is not required. BACCARI 1977 weakly supports it.

${{\boldsymbol \Lambda}{(2085)}}$ POLE POSITION

REAL PART

$-2{\times }$IMAGINARY PART

${{\boldsymbol \Lambda}{(2085)}}$ POLE RESIDUES

Normalized residue in ${{\mathit N}}$ ${{\overline{\mathit K}}}$ $\rightarrow$ ${{\mathit \Lambda}{(2085)}}$ $\rightarrow$ ${{\mathit N}}{{\overline{\mathit K}}}$

Normalized residue in ${{\mathit N}}$ ${{\overline{\mathit K}}}$ $\rightarrow$ ${{\mathit \Lambda}{(2085)}}$ $\rightarrow$ ${{\mathit \Sigma}}{{\mathit \pi}}$

Normalized residue in ${{\mathit N}}$ ${{\overline{\mathit K}}}$ $\rightarrow$ ${{\mathit \Lambda}{(2085)}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \eta}}$

Normalized residue in ${{\mathit N}}$ ${{\overline{\mathit K}}}$ $\rightarrow$ ${{\mathit \Lambda}{(2085)}}$ $\rightarrow$ ${{\mathit \Sigma}{(1385)}}{{\mathit \pi}}$ , ${\mathit F}{\mathrm -wave}$

Normalized residue in ${{\mathit N}}$ ${{\overline{\mathit K}}}$ $\rightarrow$ ${{\mathit \Lambda}{(2085)}}$ $\rightarrow$ ${{\mathit \Sigma}{(1385)}}{{\mathit \pi}}$ , ${\mathit H}{\mathrm -wave}$

${{\mathit \Lambda}{(2085)}}$ MASS

$\approx2020$ MeV

${{\mathit \Lambda}{(2085)}}$ WIDTH