LIGHT UNFLAVORED MESONS
($\mathit S$ = $\mathit C$ = $\mathit B$ = 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

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

$I^G(J^{PC})$ = $?^-(1^{- -})$ 
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 
 
$\Gamma_{1}$ ${{\mathit K}^{+}}{{\mathit K}^{-}}$  seen 725
 
$\Gamma_{2}$ ${{\overline{\mathit K}}^{*}{(892)}^{0}}{{\mathit K}_S^0}$  not seen 521
 
$\Gamma_{3}$ ${{\mathit K}^{*}{(892)}^{\pm}}{{\mathit K}^{\mp}}$  not seen 524
 
FOOTNOTES