${\mathit {\mathit c}}$ ${\mathit {\overline{\mathit c}}}$ MESONS
(including possibly non-${\mathit {\mathit q}}$ ${\mathit {\overline{\mathit q}}}$ states)
INSPIRE   JSON PDGID:
M234

${{\mathit \chi}_{{{c0}}}{(4500)}}$

$I^G(J^{PC})$ = $0^+(0^{+ +})$ 

was ${{\mathit X}{(4500)}}$
This state shows properties different from a conventional ${{\mathit q}}{{\overline{\mathit q}}}$ state. A candidate for an exotic structure. See the review on non-${{\mathit q}}{{\overline{\mathit q}}}$ states. Seen by AAIJ 2017C in ${{\mathit B}^{+}}$ $\rightarrow$ ${{\mathit \chi}_{{{c0}}}}{{\mathit K}^{+}}$, ${{\mathit \chi}_{{{c0}}}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit \phi}}$ using an amplitude analysis of ${{\mathit B}^{+}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit \phi}}{{\mathit K}^{+}}$ with a significance (accounting for systematic uncertainties) of 6.1 $\sigma $.
${{\mathit \chi}_{{{c0}}}{(4500)}}$ MASS   $4474 \pm4$ MeV 
 
${{\mathit \chi}_{{{c0}}}{(4500)}}$ WIDTH   $77 {}^{+12}_{-10}$ MeV 
 
$\Gamma_{1}$ ${{\mathit J / \psi}}{{\mathit \phi}}$   seen 776
 
FOOTNOTES