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

${{\boldsymbol \chi}_{{c1}}{(4274)}}$ $I^G(J^{PC})$ = $0^+(1^{+ +})$

was ${{\mathit X}{(4274)}}$
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 ${{\mathit B}^{+}}$ $\rightarrow$ ${{\mathit \chi}_{{c1}}}{{\mathit K}^{+}}$ , ${{\mathit \chi}_{{c1}}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit \phi}}$ using an amplitude analysis of ${{\mathit B}^{+}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit \phi}}{{\mathit K}^{+}}$ with a significance (accounting for systematic uncertainties) of 6.0 $\sigma $.
${{\mathit \chi}_{{c1}}{(4274)}}$ MASS   $4274 {}^{+8}_{-6}$ MeV 
${{\mathit \chi}_{{c1}}{(4274)}}$ WIDTH   $49 \pm12$ MeV 
$\Gamma_{1}$ ${{\mathit J / \psi}}{{\mathit \phi}}$ seen503