${{\mathit \Sigma}}$ 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 search

${{\boldsymbol \Sigma}{(1915)}}$

$I(J^P)$ = $1(5/2^{+})$ 
Discovered by COOL 1966 . For results published before 1974 (they are now obsolete), see our 1982 edition Physics Letters 111B 1 (1982). This entry only includes results from partial-wave analyses. Parameters of peaks seen in cross sections and invariant-mass distributions in this region used to be listed in in a separate entry immediately following. They may be found in our 1986 edition Physics Letters 170B 1 (1986).
${{\boldsymbol \Sigma}{(1915)}}$ POLE POSITION
REAL PART   $1885\text{ to }1915\text{ }(\approx1900) $ MeV 
 
$-2{\times }$IMAGINARY PART   $90\text{ to }110\text{ }(\approx100) $ MeV 
 
${{\boldsymbol \Sigma}{(1915)}}$ POLE RESIDUES
Normalized residue in ${{\mathit N}}$ ${{\overline{\mathit K}}}$ $\rightarrow$ ${{\mathit \Sigma}{(1915)}}$ $\rightarrow$ ${{\mathit N}}{{\overline{\mathit K}}}$   $0.08 \pm0.02$  
 
Normalized residue in ${{\mathit N}}$ ${{\overline{\mathit K}}}$ $\rightarrow$ ${{\mathit \Sigma}{(1915)}}$ $\rightarrow$ ${{\mathit \Sigma}}{{\mathit \pi}}$   $0.09 \pm0.02$  
 
Normalized residue in ${{\mathit N}}$ ${{\overline{\mathit K}}}$ $\rightarrow$ ${{\mathit \Sigma}{(1915)}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \pi}}$   $0.07 \pm0.02$  
 
Normalized residue in ${{\mathit N}}$ ${{\overline{\mathit K}}}$ $\rightarrow$ ${{\mathit \Sigma}{(1915)}}$ $\rightarrow$ ${{\mathit \Xi}}{{\mathit K}}$   $0.02 \pm0.01$  
 
Normalized residue in ${{\mathit N}}$ ${{\overline{\mathit K}}}$ $\rightarrow$ ${{\mathit \Lambda}{(1915)}}$ $\rightarrow$ ${{\mathit \Sigma}{(1385)}}{{\mathit \pi}}$ , ${\mathit P}{\mathrm -wave}$   $0.02 \pm0.02$  
 
Normalized residue in ${{\mathit N}}$ ${{\overline{\mathit K}}}$ $\rightarrow$ ${{\mathit \Lambda}{(1915)}}$ $\rightarrow$ ${{\mathit \Sigma}{(1385)}}{{\mathit \pi}}$ , ${\mathit F}{\mathrm -wave}$   $0.05 \pm0.03$  
 
Normalized residue in ${{\mathit N}}$ ${{\overline{\mathit K}}}$ $\rightarrow$ ${{\mathit \Sigma}{(1915)}}$ $\rightarrow$ ${{\mathit \Lambda}{(1520)}}{{\mathit \pi}}$ , ${\mathit D}{\mathrm -wave}$   $0.08 \pm0.02$  
 
Normalized residue in ${{\mathit N}}$ ${{\overline{\mathit K}}}$ $\rightarrow$ ${{\mathit \Sigma}{(1915)}}$ $\rightarrow$ ${{\mathit \Delta}}{{\overline{\mathit K}}}$ , ${\mathit P}{\mathrm -wave}$   $0.12 \pm0.03$  
 
Normalized residue in ${{\mathit N}}$ ${{\overline{\mathit K}}}$ $\rightarrow$ ${{\mathit \Sigma}{(1915)}}$ $\rightarrow$ ${{\mathit \Delta}}{{\overline{\mathit K}}}$ , ${\mathit F}{\mathrm -wave}$   $0.07 \pm0.02$  
 
Normalized residue in ${{\mathit N}}$ ${{\overline{\mathit K}}}$ $\rightarrow$ ${{\mathit \Sigma}{(1915)}}$ $\rightarrow$ ${{\mathit \Lambda}{(1520)}}{{\mathit \pi}}$ , ${\mathit G}{\mathrm -wave}$   $0.01 \pm0.01$  
 
Normalized residue in ${{\mathit N}}$ ${{\overline{\mathit K}}}$ $\rightarrow$ ${{\mathit \Sigma}{(1915)}}$ $\rightarrow$ ${{\mathit N}}{{\overline{\mathit K}}^{*}{(892)}}$ , $\mathit S$=1/2 , ${\mathit F}{\mathrm -wave}$   $0.07 \pm0.04$  
 
Normalized residue in ${{\mathit N}}$ ${{\overline{\mathit K}}}$ $\rightarrow$ ${{\mathit \Sigma}{(1915)}}$ $\rightarrow$ ${{\mathit N}}{{\overline{\mathit K}}^{*}{(892)}}$ , $\mathit S$=3/2 , ${\mathit P}{\mathrm -wave}$
 
Normalized residue in ${{\mathit N}}$ ${{\overline{\mathit K}}}$ $\rightarrow$ ${{\mathit \Sigma}{(1915)}}$ $\rightarrow$ ${{\mathit N}}{{\overline{\mathit K}}^{*}{(892)}}$ , $\mathit S$=3/2 , ${\mathit F}{\mathrm -wave}$   $0.07 \pm0.03$  
 
${{\mathit \Sigma}{(1915)}}$ MASS   $1900\text{ to }1935\text{ }(\approx1915) $ MeV 
 
${{\mathit \Sigma}{(1915)}}$ WIDTH   $80\text{ to }160\text{ }(\approx120) $ MeV 
 
$\Gamma_{1}$ ${{\mathit N}}{{\overline{\mathit K}}}$  0.05 TO 0.15 618
 
$\Gamma_{2}$ ${{\mathit \Lambda}}{{\mathit \pi}}$  $(6.0\pm{2.0})\%$ 623
 
$\Gamma_{3}$ ${{\mathit \Sigma}}{{\mathit \pi}}$  $(10.0\pm{2.0})\%$ 577
 
$\Gamma_{4}$ ${{\mathit \Xi}}{{\mathit K}}$  284
 
$\Gamma_{5}$ ${{\mathit \Sigma}{(1385)}}{{\mathit \pi}}$ , ${\mathit P}{\mathrm -wave}$  $(2.0\pm{2.0})\%$ 443
 
$\Gamma_{6}$ ${{\mathit \Sigma}{(1385)}}{{\mathit \pi}}$ , ${\mathit F}{\mathrm -wave}$  $(4.0\pm{2.0})\%$ 443
 
$\Gamma_{7}$ ${{\mathit \Sigma}{(1385)}}{{\mathit \pi}}$  $<5\%$ 443
 
$\Gamma_{8}$ ${{\mathit \Sigma}{(1385)}}{{\mathit \pi}}$ , ${\mathit P}{\mathrm -wave}$  443
 
$\Gamma_{9}$ ${{\mathit \Sigma}{(1385)}}{{\mathit \pi}}$ , ${\mathit F}{\mathrm -wave}$  443
 
$\Gamma_{10}$ ${{\mathit \Lambda}{(1520)}}{{\mathit \pi}}$ , ${\mathit D}{\mathrm -wave}$  $(8.0\pm{2.0})\%$ 334
 
$\Gamma_{11}$ ${{\mathit \Lambda}{(1520)}}{{\mathit \pi}}$ , ${\mathit G}{\mathrm -wave}$  334
 
$\Gamma_{12}$ ${{\mathit N}}{{\overline{\mathit K}}^{*}{(892)}}$ , $\mathit S$=1/2, ${\mathit F}{\mathrm -wave}$  $(5.0\pm{3.0})\%$ 282
 
$\Gamma_{13}$ ${{\mathit N}}{{\overline{\mathit K}}^{*}{(892)}}$ , $\mathit S$=3/2, ${\mathit P}{\mathrm -wave}$  282
 
$\Gamma_{14}$ ${{\mathit N}}{{\overline{\mathit K}}^{*}{(892)}}$ , $\mathit S$=3/2, ${\mathit F}{\mathrm -wave}$  $(5.0\pm{2.0})\%$ 282
 
$\Gamma_{15}$ ${{\mathit \Delta}}{{\overline{\mathit K}}}$ , ${\mathit P}{\mathrm -wave}$  $(16\pm{5})\%$ 383
 
$\Gamma_{16}$ ${{\mathit \Delta}}{{\overline{\mathit K}}}$ , ${\mathit F}{\mathrm -wave}$  $(5.0\pm{3.0})\%$ 383
 
FOOTNOTES