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

${{\boldsymbol \Lambda}{(2020)}}$ $I(J^P)$ = $0(7/2^{+})$

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.
${{\boldsymbol \Lambda}{(2020)}}$ POLE POSITION
REAL PART
$-2{\times }$IMAGINARY PART
${{\boldsymbol \Lambda}{(2020)}}$ POLE RESIDUES
Normalized residue in ${{\mathit N}}$ ${{\overline{\mathit K}}}$ $\rightarrow$ ${{\mathit \Lambda}{(2020)}}$ $\rightarrow$ ${{\mathit N}}{{\overline{\mathit K}}}$
Normalized residue in ${{\mathit N}}$ ${{\overline{\mathit K}}}$ $\rightarrow$ ${{\mathit \Lambda}{(2020)}}$ $\rightarrow$ ${{\mathit \Sigma}}{{\mathit \pi}}$
Normalized residue in ${{\mathit N}}$ ${{\overline{\mathit K}}}$ $\rightarrow$ ${{\mathit \Lambda}{(2020)}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \eta}}$
Normalized residue in ${{\mathit N}}$ ${{\overline{\mathit K}}}$ $\rightarrow$ ${{\mathit \Lambda}{(2020)}}$ $\rightarrow$ ${{\mathit \Sigma}{(1385)}}{{\mathit \pi}}$ , ${\mathit F}{\mathrm -wave}$
Normalized residue in ${{\mathit N}}$ ${{\overline{\mathit K}}}$ $\rightarrow$ ${{\mathit \Lambda}{(2020)}}$ $\rightarrow$ ${{\mathit \Sigma}{(1385)}}{{\mathit \pi}}$ , ${\mathit H}{\mathrm -wave}$
${{\mathit \Lambda}{(2020)}}$ MASS   $\approx2020$ MeV 
${{\mathit \Lambda}{(2020)}}$ WIDTH
$\Gamma_{1}$ ${{\mathit N}}{{\overline{\mathit K}}}$ 695
$\Gamma_{2}$ ${{\mathit \Sigma}}{{\mathit \pi}}$ 651
$\Gamma_{3}$ ${{\mathit \Lambda}}{{\mathit \eta}}$ 550
$\Gamma_{4}$ ${{\mathit \Sigma}{(1385)}}{{\mathit \pi}}$ , ${\mathit F}{\mathrm -wave}$ 524
$\Gamma_{5}$ ${{\mathit \Sigma}{(1385)}}{{\mathit \pi}}$ , ${\mathit H}{\mathrm -wave}$ 524
$\Gamma_{6}$ ${{\mathit N}}{{\overline{\mathit K}}^{*}{(892)}}$ , $\mathit S$=1/2, ${\mathit F}{\mathrm -wave}$ 427
$\Gamma_{7}$ ${{\mathit N}}{{\overline{\mathit K}}^{*}{(892)}}$ , $\mathit S$=3/2, ${\mathit F}{\mathrm -wave}$ 427
$\Gamma_{8}$ ${{\mathit N}}{{\overline{\mathit K}}^{*}{(892)}}$ , $\mathit S$=3/2, ${\mathit H}{\mathrm -wave}$ 427
$\Gamma_{9}$ ${{\mathit \Lambda}}{{\mathit \omega}}$ 341
$\Gamma_{10}$ ${{\mathit N}}{{\overline{\mathit K}}^{*}{(892)}}$ , $\mathit S$=1/2 $(30\pm{9})\%$427