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

${{\boldsymbol f}_{{0}}{(500)}}$ $I^G(J^{PC})$ = $0^+(0^{+ +})$

also known as ${{\mathit \sigma}}$; was ${{\mathit f}_{{0}}{(600)}}$
 See related review: Scalar Mesons below 2 GeV
 ${{\mathit f}_{{0}}{(500)}}$ T-MATRIX POLE $\sqrt {\mathit s }$ $(400 - 550)−{\mit i}(200 - 350)$ MeV
 ${{\mathit f}_{{0}}{(500)}}$ BREIT-WIGNER MASS OR K-MATRIX POLE PARAMETERS $\text{(400 - 550)}$ MeV
 ${{\mathit f}_{{0}}{(500)}}$ BREIT-WIGNER WIDTH $\text{(400 - 700)}$ MeV
 $\Gamma_{1}$ ${{\mathit \pi}}{{\mathit \pi}}$ seen
 $\Gamma_{2}$ ${{\mathit \gamma}}{{\mathit \gamma}}$ seen