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

INSPIRE   JSON PDGID: B055

${{\mathit \Lambda}{(1690)}}$ $I(J^P)$ = $0(3/2^{-})$

The measurements of the mass, width, and elasticity published before 1974 are now obsolete and have been omitted. They were last listed in our 1982 edition Physics Letters 111B 1 (1982).

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▸  exp ${{\mathit \Lambda}{(1690)}}$ POLE POSITION

REAL PART 1680 TO 1700 $(\approx 1690 )$ MeV

$-2{\times }$IMAGINARY PART 60 TO 80 $(\approx 70 )$ MeV

▸  exp ${{\mathit \Lambda}{(1690)}}$ POLE RESIDUES

Normalized residue in ${{\mathit N}}$ ${{\overline{\mathit K}}}$ $\rightarrow$ ${{\mathit \Lambda}{(1690)}}$ $\rightarrow$ ${{\mathit N}}{{\overline{\mathit K}}}$ $0.24$ $\pm0.05$

Normalized residue in ${{\mathit N}}$ ${{\overline{\mathit K}}}$ $\rightarrow$ ${{\mathit \Lambda}{(1690)}}$ $\rightarrow$ ${{\mathit \Sigma}}{{\mathit \pi}}$ $0.35$ $\pm0.07$

Normalized residue in ${{\mathit N}}$ ${{\overline{\mathit K}}}$ $\rightarrow$ ${{\mathit \Lambda}{(1690)}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \eta}}$ $0.05$ $\pm0.02$

Normalized residue in ${{\mathit N}}$ ${{\overline{\mathit K}}}$ $\rightarrow$ ${{\mathit \Lambda}{(1690)}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \sigma}}$ $0.08$ $\pm0.02$

Normalized residue in ${{\mathit N}}$ ${{\overline{\mathit K}}}$ $\rightarrow$ ${{\mathit \Lambda}{(1690)}}$ $\rightarrow$ ${{\mathit \Sigma}{(1385)}}{{\mathit \pi}}$ , ${\mathit S}{\mathrm -wave}$ $0.11$ $\pm0.06$

Normalized residue in ${{\mathit N}}$ ${{\overline{\mathit K}}}$ $\rightarrow$ ${{\mathit \Lambda}{(1690)}}$ $\rightarrow$ ${{\mathit \Sigma}{(1385)}}{{\mathit \pi}}$ , ${\mathit D}{\mathrm -wave}$ $0.06$ $\pm0.04$

Normalized residue in ${{\mathit N}}$ ${{\overline{\mathit K}}}$ $\rightarrow$ ${{\mathit \Lambda}{(1690)}}$ $\rightarrow$ ${{\mathit N}}{{\overline{\mathit K}}^{*}{(892)}}$ , ${\mathit S}{\mathrm -wave}$ $0.05$ $\pm0.04$

Normalized residue in ${{\mathit N}}$ ${{\overline{\mathit K}}}$ $\rightarrow$ ${{\mathit \Lambda}{(1690)}}$ $\rightarrow$ ${{\mathit N}}{{\overline{\mathit K}}^{*}{(892)}}$ , ${\mathit D}{\mathrm -wave}$ $0.18$ $\pm0.05$

${{\mathit \Lambda}{(1690)}}$ MASS 1685 TO 1695 $(\approx 1690 )$ MeV

${{\mathit \Lambda}{(1690)}}$ WIDTH 60 TO 80 $(\approx 70 )$ MeV

${{\mathit \Lambda}{(1690)}}$ DECAY MODES

Mode   Fraction ($\Gamma_i$ / $\Gamma$) Scale Factor/ Conf. Level P(MeV/c)   $\Gamma_{1}$ ${{\mathit N}}{{\overline{\mathit K}}}$ $(20-30) \%$ 433   $\Gamma_{2}$ ${{\mathit \Sigma}}{{\mathit \pi}}$ $(20-40) \%$ 410   $\Gamma_{3}$ ${{\mathit \Lambda}}{{\mathit \sigma}}$ ($5.0$ $\pm2.0$ ) $\%$     $\Gamma_{4}$ ${{\mathit \Lambda}}{{\mathit \pi}}{{\mathit \pi}}$ $\sim25$ $\%$ 419   $\Gamma_{5}$ ${{\mathit \Sigma}}{{\mathit \pi}}{{\mathit \pi}}$ $\sim20$ $\%$ 358   $\Gamma_{6}$ ${{\mathit \Lambda}}{{\mathit \eta}}$ 140   $\Gamma_{7}$ ${{\mathit \Sigma}{(1385)}}{{\mathit \pi}}$ , ${\mathit S}{\mathrm -wave}$ ($9$ $\pm5$ ) $\%$ 251   $\Gamma_{8}$ ${{\mathit \Sigma}{(1385)}}{{\mathit \pi}}$ , ${\mathit D}{\mathrm -wave}$ ($3.0$ $\pm2.0$ ) $\%$ 251   $\Gamma_{9}$ ${{\mathit N}}{{\overline{\mathit K}}^{*}{(892)}}$ , $\mathit S$=1/2, ${\mathit D}{\mathrm -wave}$ -1   $\Gamma_{10}$ ${{\mathit N}}{{\overline{\mathit K}}^{*}{(892)}}$ , $\mathit S$=3/2, ${\mathit S}{\mathrm -wave}$ -1   $\Gamma_{11}$ ${{\mathit N}}{{\overline{\mathit K}}^{*}{(892)}}$ , $\mathit S$=3/2, ${\mathit D}{\mathrm -wave}$ -1