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:
M085

${{\mathit X}{(1835)}}$

$I^G(J^{PC})$ = $0^+(0^{- +})$ 
Could be a superposition of two states, one appearing as threshold enhancement in ${{\mathit p}}{{\overline{\mathit p}}}$ the other one with a lower mass at 1835 MeV. Coupled-channel analyses with more sophisticated model are needed.
${{\mathit X}{(1835)}}$ MASS   $1834.0 {}^{+4.0}_{-3.0}$ MeV (S = 1.2)
 
${{\mathit X}{(1835)}}$ WIDTH   $130 \pm50$ MeV (S = 6.4)
 
$\Gamma_{1}$ ${{\mathit p}}{{\overline{\mathit p}}}$   seen -1
 
$\Gamma_{2}$ ${{\mathit \eta}^{\,'}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$   seen 629
 
$\Gamma_{3}$ ${{\mathit \gamma}}{{\mathit \gamma}}$   not seen 917
 
$\Gamma_{4}$ ${{\mathit K}_S^0}$ ${{\mathit K}_S^0}$ ${{\mathit \eta}}$   seen 481
 
$\Gamma_{5}$ ${{\mathit \gamma}}{{\mathit \phi}{(1020)}}$   seen 634
 
$\Gamma_{6}$ 3 ( ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$)   seen 777
 
FOOTNOTES