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

${{\boldsymbol X}{(1835)}}$ $I^G(J^{PC})$ = $?^?(0^{- +})$

Could be a superposition of two states, one with small width appearing as threshold enhancement in ${{\mathit p}}{{\overline{\mathit p}}}$ , the other one with a larger width. For the former ABLIKIM 2012D determine $\mathit J{}^{PC} = 0{}^{-+}$.

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

$1826.5 {}^{+13.0}_{-3.4}$ MeV

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

$242 {}^{+14}_{-15}$ MeV

Decay Modes