LIGHT UNFLAVORED MESONS
($\boldsymbol S$ = $\boldsymbol C$ = $\boldsymbol B$ = 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

${{\boldsymbol \eta}_{{2}}{(1645)}}$ $I^G(J^{PC})$ = $0^+(2^{- +})$ 

${{\mathit \eta}_{{2}}{(1645)}}$ MASS   $1617 \pm5$ MeV 
${{\mathit \eta}_{{2}}{(1645)}}$ WIDTH   $181 \pm11$ MeV 
$\Gamma_{1}$ ${{\mathit a}_{{2}}{(1320)}}{{\mathit \pi}}$ seen243
$\Gamma_{2}$ ${{\mathit K}}{{\overline{\mathit K}}}{{\mathit \pi}}$ seen580
$\Gamma_{3}$ ${{\mathit K}^{*}}{{\overline{\mathit K}}}$ seen404
$\Gamma_{4}$ ${{\mathit \eta}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ seen685
$\Gamma_{5}$ ${{\mathit a}_{{0}}{(980)}}{{\mathit \pi}}$ seen499
$\Gamma_{6}$ ${{\mathit f}_{{2}}{(1270)}}{{\mathit \eta}}$ not seen-1