${\mathit {\mathit c}}$ ${\mathit {\overline{\mathit c}}}$ MESONS
(including possibly non-${\mathit {\mathit q}}$ ${\mathit {\overline{\mathit q}}}$ states)
INSPIRE   JSON PDGID:
M233

${{\mathit \chi}_{{{c1}}}{(4274)}}$

$I^G(J^{PC})$ = $0^+(1^{+ +})$ 

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   $4286 {}^{+8}_{-9}$ MeV (S = 1.7)
 
${{\mathit \chi}_{{{c1}}}{(4274)}}$ WIDTH   $51 \pm7$ MeV 
 
$\Gamma_{1}$ ${{\mathit J / \psi}}{{\mathit \phi}}$   seen 522
 
FOOTNOTES