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

${{\boldsymbol \pi}{(1800)}}$ $I^G(J^{PC})$ = $1^-(0^{- +})$ 

See the related review on "Non-${{\mathit q}{\overline{\mathit q}}}$ mesons."
${{\mathit \pi}{(1800)}}$ MASS   $1810 {}^{+9}_{-11}$ MeV (S = 2.2)
${{\mathit \pi}{(1800)}}$ WIDTH   $215 {}^{+7}_{-8}$ MeV 
$\Gamma_{1}$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{-}}$ seen878
$\Gamma_{2}$ ${{\mathit f}_{{0}}{(500)}}{{\mathit \pi}^{-}}$ seen
$\Gamma_{3}$ ${{\mathit f}_{{0}}{(980)}}{{\mathit \pi}^{-}}$ seen624
$\Gamma_{4}$ ${{\mathit f}_{{0}}{(1370)}}{{\mathit \pi}^{-}}$ seen366
$\Gamma_{5}$ ${{\mathit f}_{{0}}{(1500)}}{{\mathit \pi}^{-}}$ not seen247
$\Gamma_{6}$ ${{\mathit \rho}}{{\mathit \pi}^{-}}$ not seen731
$\Gamma_{7}$ ${{\mathit \eta}}{{\mathit \eta}}{{\mathit \pi}^{-}}$ seen660
$\Gamma_{8}$ ${{\mathit a}_{{0}}{(980)}}{{\mathit \eta}}$ seen471
$\Gamma_{9}$ ${{\mathit a}_{{2}}{(1320)}}{{\mathit \eta}}$ not seen-1
$\Gamma_{10}$ ${{\mathit f}_{{2}}{(1270)}}{{\mathit \pi}}$ not seen441
$\Gamma_{11}$ ${{\mathit f}_{{0}}{(1370)}}{{\mathit \pi}^{-}}$ not seen366
$\Gamma_{12}$ ${{\mathit f}_{{0}}{(1500)}}{{\mathit \pi}^{-}}$ seen247
$\Gamma_{13}$ ${{\mathit \eta}}{{\mathit \eta}^{\,'}{(958)}}{{\mathit \pi}^{-}}$ seen373
$\Gamma_{14}$ ${{\mathit K}_{{0}}^{*}{(1430)}}{{\mathit K}^{-}}$ seen-1
$\Gamma_{15}$ ${{\mathit K}^{*}{(892)}}{{\mathit K}^{-}}$ not seen568