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 search

${{\boldsymbol X}{(2370)}}$

$I^G(J^{PC})$ = $?^?(?^{? ?})$ 
${{\mathit X}{(2370)}}$ MASS   $2342 \pm9$ MeV 
 
${{\mathit X}{(2370)}}$ WIDTH   $117 \pm13$ MeV 
 
$\Gamma_{1}$ ${{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit \eta}^{\,'}}$  seen 652
 
$\Gamma_{2}$ ${{\mathit K}_S^0}$ ${{\mathit K}_S^0}$ ${{\mathit \eta}^{\,'}}$  seen 646
 
$\Gamma_{3}$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \eta}^{\,'}}$  seen 951
 
FOOTNOTES