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

# ${{\boldsymbol a}_{{0}}{(980)}}$ $I^G(J^{PC})$ = $1^-(0^{+ +})$

See the review on "Scalar Mesons below 2 GeV."
${{\boldsymbol a}_{{0}}{(980)}}$ MASS
 Mass $\mathit m$ $980 \pm20$ MeV
 ${{\mathit \eta}}{{\mathit \pi}}$ FINAL STATE ONLY
 ${{\mathit K}}{{\overline{\mathit K}}}$ ONLY
${{\boldsymbol a}_{{0}}{(980)}}$ WIDTH
 Full width $\Gamma$ $50\text{ to }100$ MeV
 ${{\mathit K}}{{\overline{\mathit K}}}$ ONLY $92 \pm8$ MeV