LIGHT UNFLAVORED MESONS
($\mathit S$ = $\mathit C$ = $\mathit B$ = $\mathit{0}$)
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

${{\mathit X}{(1750)}}$ $I^G(J^{PC})$ = $?^-(1^{- -})$

The ${{\mathit X}{(1750)}}$ was separated from the ${{\mathit \phi}{(1680)}}$ in the 2022 listings due to its incompatible mass and incompatible pattern of ${{\overline{\mathit K}}}{{\mathit K}}$ and ${{\overline{\mathit K}}^{*}{(892)}}{{\mathit K}}$ branching fractions.

${{\mathit X}{(1750)}}$ MASS

$1753.8 \pm2.7$ MeV

${{\mathit X}{(1750)}}$ WIDTH

$120 \pm10$ MeV

${{\boldsymbol X}{(1750)}}$ DECAY MODES