($\boldsymbol S$ = $\boldsymbol C$ = $\boldsymbol B$ = 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

${{\boldsymbol \pi}_{{1}}{(1400)}}$ $I^G(J^{PC})$ = $1^-(1^{- +})$ 

See the review on "Non- ${\mathit {\mathit q}}$ ${\mathit {\overline{\mathit q}}}$ Mesons" and a note in PDG 2006 , Journal of Physics G33 1 (2006).
${{\mathit \pi}_{{1}}{(1400)}}$ MASS   $1354 \pm25$ MeV (S = 1.8)
${{\mathit \pi}_{{1}}{(1400)}}$ WIDTH   $330 \pm35$ MeV 
$\Gamma_{1}$ ${{\mathit \eta}}{{\mathit \pi}^{0}}$  seen 557
$\Gamma_{2}$ ${{\mathit \eta}}{{\mathit \pi}^{-}}$  seen 556
$\Gamma_{3}$ ${{\mathit \eta}^{\,'}}{{\mathit \pi}}$  318
$\Gamma_{4}$ ${{\mathit \rho}{(770)}}{{\mathit \pi}}$  not seen 442