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   JSON PDGID:
M247

${{\mathit \eta}{(2370)}}$

$I^G(J^{PC})$ = $0^+(0^{- +})$ 

was ${{\mathit X}{(2370)}}$
$\mathit J{}^{PC} = 0{}^{-+}$ determined by ABLIKIM 2024.
${{\mathit \eta}{(2370)}}$ MASS $2377$ $\pm9$ MeV 
 
${{\mathit \eta}{(2370)}}$ WIDTH $148^{+80}_{-28}$ MeV (S = 1.7)
 
Mode  
Fraction ($\Gamma_i$ / $\Gamma$) Scale Factor/
Conf. Level		 P(MeV/c)  
$\Gamma_{1}$ ${{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit \eta}^{\,'}}$ seen 683
 
$\Gamma_{2}$ ${{\mathit K}_S^0}$ ${{\mathit K}_S^0}$ ${{\mathit \eta}^{\,'}}$ seen 677
 
$\Gamma_{3}$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \eta}^{\,'}}$ seen 973
 
$\Gamma_{4}$ ${{\mathit f}_{{{0}}}{(980)}}{{\mathit \eta}^{\,'}}$ seen 681
 
$\Gamma_{5}$ ${{\mathit \eta}}{{\mathit \eta}}{{\mathit \eta}^{\,'}}$ not seen 597