LIGHT UNFLAVORED MESONS
($\mathit S$ = $\mathit C$ = $\mathit B$ = 0)
For $\mathit I = 1$ (${{\mathit \pi}}$, ${{\mathit b}}$, ${{\mathit \rho}}$, ${{\mathit a}}$): ${\mathit {\mathit u}}$ ${\mathit {\overline{\mathit d}}}$, ( ${\mathit {\mathit u}}$ ${\mathit {\overline{\mathit u}}}−$ ${\mathit {\mathit d}}$ ${\mathit {\overline{\mathit d}}})/\sqrt {2 }$, ${\mathit {\mathit d}}$ ${\mathit {\overline{\mathit u}}}$;
for $\mathit I = 0$ (${{\mathit \eta}}$, ${{\mathit \eta}^{\,'}}$, ${{\mathit h}}$, ${{\mathit h}^{\,'}}$, ${{\mathit \omega}}$, ${{\mathit \phi}}$, ${{\mathit f}}$, ${{\mathit f}^{\,'}}$): ${\mathit {\mathit c}}_{{\mathrm {1}}}$( ${{\mathit u}}{{\overline{\mathit u}}}$ $+$ ${{\mathit d}}{{\overline{\mathit d}}}$ ) $+$ ${\mathit {\mathit c}}_{{\mathrm {2}}}$( ${{\mathit s}}{{\overline{\mathit s}}}$ ) 		INSPIRE   JSON  (beta) PDGID:
M037

${{\mathit \eta}{(1295)}}$

$I^G(J^{PC})$ = $0^+(0^{- +})$ 
See the review on "Spectroscopy of Light Meson Resonances."
${{\mathit \eta}{(1295)}}$ MASS   $1294 \pm4$ MeV (S = 1.6)
 
${{\mathit \eta}{(1295)}}$ WIDTH   $55 \pm5$ MeV 
 
$\Gamma_{1}$ ${{\mathit \eta}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$   seen 487
 
$\Gamma_{2}$ ${{\mathit a}_{{0}}{(980)}}{{\mathit \pi}}$   seen 248
 
$\Gamma_{3}$ ${{\mathit \gamma}}{{\mathit \gamma}}$   647
 
$\Gamma_{4}$ ${{\mathit \eta}}{{\mathit \pi}^{0}}{{\mathit \pi}^{0}}$   seen 490
 
$\Gamma_{5}$ ${{\mathit \eta}}{({\mathit \pi}{\mathit \pi})_{{{\mathit S}-{\text{wave}}}}}$   seen  
 
$\Gamma_{6}$ ${{\mathit \sigma}}{{\mathit \eta}}$   seen  
 
$\Gamma_{7}$ ${{\mathit K}}{{\overline{\mathit K}}}{{\mathit \pi}}$   seen 320
 
FOOTNOTES