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

${{\boldsymbol a}_{{4}}{(1970)}}$ $I^G(J^{PC})$ = $1^-(4^{+ +})$ 


was ${{\mathit a}_{{4}}{(2040)}}$
${{\mathit a}_{{4}}{(1970)}}$ MASS   $1967 \pm16$ MeV (S = 2.1)
${{\mathit a}_{{4}}{(1970)}}$ WIDTH   $324 {}^{+15}_{-18}$ MeV 
$\Gamma_{1}$ ${{\mathit K}}{{\overline{\mathit K}}}$ seen851
$\Gamma_{2}$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$ seen959
$\Gamma_{3}$ ${{\mathit \rho}}{{\mathit \pi}}$ seen825
$\Gamma_{4}$ ${{\mathit f}_{{2}}{(1270)}}{{\mathit \pi}}$ seen559
$\Gamma_{5}$ ${{\mathit \omega}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$ seen801
$\Gamma_{6}$ ${{\mathit \omega}}{{\mathit \rho}}$ seen601
$\Gamma_{7}$ ${{\mathit \eta}}{{\mathit \pi}}$ seen902
$\Gamma_{8}$ ${{\mathit \eta}^{\,'}{(958)}}{{\mathit \pi}}$ seen743