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

${{\boldsymbol \eta}{(1475)}}$ $I^G(J^{PC})$ = $0^+(0^{- +})$ 

See the ${{\mathit \eta}{(1405)}}$ and the related review on "Pseudoscalar and Pseudovector Mesons in the 1400 MeV Region."
${{\mathit \eta}{(1475)}}$ MASS   $1475 \pm4$ MeV (S = 1.4)
${{\mathit \eta}{(1475)}}$ WIDTH   $90 \pm9$ MeV (S = 1.6)
$\Gamma_{1}$ ${{\mathit K}}{{\overline{\mathit K}}}{{\mathit \pi}}$ seen477
$\Gamma_{2}$ ${{\mathit K}}{{\overline{\mathit K}}^{*}{(892)}}$ + c.c. seen244
$\Gamma_{3}$ ${{\mathit a}_{{0}}{(980)}}{{\mathit \pi}}$ seen396
$\Gamma_{4}$ ${{\mathit \gamma}}{{\mathit \gamma}}$ seen738
$\Gamma_{5}$ ${{\mathit K}_S^0}$ ${{\mathit K}_S^0}$ ${{\mathit \eta}}$ possibly seen-1
$\Gamma_{6}$ ${{\mathit \gamma}}{{\mathit \phi}{(1020)}}$ possibly seen385