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

#### ${{\mathit \Lambda}{(1820)}}$

$I(J^P)$ = $0(5/2^{+})$
This resonance is the cornerstone for all partial-wave analyses in this region. Most of the results published before 1973 are now obsolete and have been omitted. They may be found in our 1982 edition Physics Letters 111B 1 (1982).
${{\mathit \Lambda}{(1820)}}$ POLE POSITION
 REAL PART $1812\text{ to }1825\text{ }(\approx1818)$ MeV
 $-2{\times }$IMAGINARY PART $75\text{ to }80\text{ }(\approx77)$ MeV
${{\mathit \Lambda}{(1820)}}$ POLE RESIDUES
 Normalized residue in ${{\mathit N}}$ ${{\overline{\mathit K}}}$ $\rightarrow$ ${{\mathit \Lambda}{(1820)}}$ $\rightarrow$ ${{\mathit N}}{{\overline{\mathit K}}}$ $0.60 \pm0.12$
 Normalized residue in ${{\mathit N}}$ ${{\overline{\mathit K}}}$ $\rightarrow$ ${{\mathit \Lambda}{(1820)}}$ $\rightarrow$ ${{\mathit \Sigma}}{{\mathit \pi}}$ $0.34 \pm0.07$
 Normalized residue in ${{\mathit N}}$ ${{\overline{\mathit K}}}$ $\rightarrow$ ${{\mathit \Lambda}{(1820)}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \eta}}$
 Normalized residue in ${{\mathit N}}$ ${{\overline{\mathit K}}}$ $\rightarrow$ ${{\mathit \Lambda}{(1820)}}$ $\rightarrow$ ${{\mathit \Xi}}{{\mathit K}}$
 Normalized residue in ${{\mathit N}}$ ${{\overline{\mathit K}}}$ $\rightarrow$ ${{\mathit \Lambda}{(1820)}}$ $\rightarrow$ ${{\mathit \Sigma}{(1385)}}{{\mathit \pi}}$ , ${\mathit P}{\mathrm -wave}$ $0.07 \pm0.02$
 Normalized residue in ${{\mathit N}}$ ${{\overline{\mathit K}}}$ $\rightarrow$ ${{\mathit \Lambda}{(1820)}}$ $\rightarrow$ ${{\mathit \Sigma}{(1385)}}{{\mathit \pi}}$ , ${\mathit F}{\mathrm -wave}$ $0.11 \pm0.04$
 Normalized residue in ${{\mathit N}}$ ${{\overline{\mathit K}}}$ $\rightarrow$ ${{\mathit \Lambda}{(1820)}}$ $\rightarrow$ ${{\mathit N}}{{\overline{\mathit K}}^{*}{(892)}}$ , $\mathit S$=1/2 , ${\mathit F}{\mathrm -wave}$ $0.02 \pm0.02$
 Normalized residue in ${{\mathit N}}$ ${{\overline{\mathit K}}}$ $\rightarrow$ ${{\mathit \Lambda}{(1820)}}$ $\rightarrow$ ${{\mathit N}}{{\overline{\mathit K}}^{*}{(892)}}$ , $\mathit S$=3/2 , ${\mathit P}{\mathrm -wave}$ $0.35 \pm0.15$
 Normalized residue in ${{\mathit N}}$ ${{\overline{\mathit K}}}$ $\rightarrow$ ${{\mathit \Lambda}{(1820)}}$ $\rightarrow$ ${{\mathit N}}{{\overline{\mathit K}}^{*}{(892)}}$ , $\mathit S$=3/2 , ${\mathit F}{\mathrm -wave}$ $0.02 \pm0.02$
 ${{\mathit \Lambda}{(1820)}}$ MASS $1815\text{ to }1825\text{ }(\approx1820)$ MeV
 ${{\mathit \Lambda}{(1820)}}$ WIDTH $70\text{ to }90\text{ }(\approx80)$ MeV
 $\Gamma_{1}$ ${{\mathit N}}{{\overline{\mathit K}}}$ 55$-65\%$ 545
 $\Gamma_{2}$ ${{\mathit \Sigma}}{{\mathit \pi}}$ 8$-14\%$ 509
 $\Gamma_{3}$ ${{\mathit \Sigma}{(1385)}}{{\mathit \pi}}$ 5$-10\%$ 366
 $\Gamma_{4}$ ${{\mathit \Sigma}{(1385)}}{{\mathit \pi}}$ , ${\mathit P}{\mathrm -wave}$ 366
 $\Gamma_{5}$ ${{\mathit \Sigma}{(1385)}}{{\mathit \pi}}$ , ${\mathit F}{\mathrm -wave}$ $(2.0\pm{1.0})\%$ 366
 $\Gamma_{6}$ ${{\mathit \Lambda}}{{\mathit \eta}}$ 351
 $\Gamma_{7}$ ${{\mathit \Xi}}{{\mathit K}}$ 91
 $\Gamma_{8}$ ${{\mathit \Sigma}}{{\mathit \pi}}{{\mathit \pi}}$ 469
 $\Gamma_{9}$ ${{\mathit N}}{{\overline{\mathit K}}^{*}{(892)}}$ , $\mathit S$=1/2, ${\mathit F}{\mathrm -wave}$ -1
 $\Gamma_{10}$ ${{\mathit N}}{{\overline{\mathit K}}^{*}{(892)}}$ , $\mathit S$=3/2, ${\mathit P}{\mathrm -wave}$ $(3.0\pm{1.0})\%$ -1
 $\Gamma_{11}$ ${{\mathit N}}{{\overline{\mathit K}}^{*}{(892)}}$ , $\mathit S$=3/2, ${\mathit F}{\mathrm -wave}$ -1
 FOOTNOTES