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${{\mathit X}{(1835)}}$
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 $\mathit J{}^{PC} = 0{}^{-+}$.
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${{\mathit X}{(1835)}}$ MASS
$1826.5 {}^{+13.0}_{-3.4}$ MeV
${{\mathit X}{(1835)}}$ WIDTH
$242 {}^{+14}_{-15}$ MeV
Decay Modes
Mode
Fraction ($\Gamma_i$ / $\Gamma$)
Scale Factor/
Conf. Level
P (MeV/c)
$\Gamma_{1}$
${{\mathit p}}{{\overline{\mathit p}}}$
seen
-1
$\Gamma_{2}$
${{\mathit \eta}^{\,'}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$
seen
624
$\Gamma_{3}$
${{\mathit \gamma}}{{\mathit \gamma}}$
913
$\Gamma_{4}$
${{\mathit K}_S^0}$ ${{\mathit K}_S^0}$ ${{\mathit \eta}}$
seen
474
$\Gamma_{5}$
${{\mathit \gamma}}{{\mathit \phi}{(1020)}}$
possibly seen
629
$\Gamma_{6}$
3 ( ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$)
seen
773