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

${{\mathit X}{(4630)}}$

$I^G(J^{PC})$ = $0^+(?^{? +})$ 
This state shows properties different from a conventional ${{\mathit q}}{{\overline{\mathit q}}}$ state. A candidate for an exotic structure. See the review on "Heavy Non-${{\mathit q}}{{\overline{\mathit q}}}$ Mesons." Seen by AAIJ 2021E in ${{\mathit B}^{+}}$ $\rightarrow$ ${{\mathit X}{(4630)}}{{\mathit K}^{+}}$ with ${{\mathit X}{(4630)}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit \phi}}$ using an amplitude analysis of ${{\mathit B}^{+}}$ $\rightarrow$ ${{\mathit J / \psi}}{{\mathit \phi}}{{\mathit K}^{+}}$ with a significance (accounting for systematic uncertainties) of 5.5 $\sigma $. The $\mathit J{}^{P} = 1{}^{-}$ assignment is favored over ${}^{}2{}^{-}$ with a significance of 3 $\sigma $ and other assignments are disfavored by more than 5 $\sigma $.
${{\mathit X}{(4630)}}$ MASS   $4626 {}^{+24}_{-110}$ MeV 
 
${{\mathit X}{(4630)}}$ WIDTH   $174 {}^{+140}_{-80}$ MeV 
 
$\Gamma_{1}$ ${{\mathit J / \psi}}{{\mathit \phi}}$  seen 943
 
FOOTNOTES