${\boldsymbol {\boldsymbol c}}$ ${\boldsymbol {\overline{\boldsymbol c}}}$ MESONS
(including possibly non- ${\boldsymbol {\boldsymbol q}}$ ${\boldsymbol {\overline{\boldsymbol q}}}$ states)
INSPIRE search

${{\boldsymbol \chi}_{{c0}}{(4500)}}$ $I^G(J^{PC})$ = $0^+(0^{+ +})$


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   $4506 {}^{+16}_{-19}$ MeV 
${{\mathit \chi}_{{c0}}{(4500)}}$ WIDTH   $92 \pm29$ MeV 
$\Gamma_{1}$ ${{\mathit J / \psi}}{{\mathit \phi}}$ 813