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

${{\boldsymbol X}{(4055)}^{\pm}}$ $I^G(J^{PC})$ = $1^+(?^{? -})$ I, G, C need confirmation.

Properties incompatible with a ${{\mathit q}}{{\overline{\mathit q}}}$ structure (exotic state). See the review on non- ${{\mathit q}}{{\overline{\mathit q}}}$ states. Needs confirmation. Seen by WANG 2015A in the ${{\mathit \psi}{(2S)}}{{\mathit \pi}^{+}}$ invariant mass distribution in ${{\mathit \psi}{(4360)}}$ $\rightarrow$ ${{\mathit \psi}{(2S)}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ decay.
${{\mathit X}{(4055)}^{\pm}}$ MASS   $4054 \pm3.2$ MeV 
${{\mathit X}{(4055)}^{\pm}}$ WIDTH   $45 \pm13$ MeV 
$\Gamma_{1}$ ${{\mathit \pi}^{+}}{{\mathit \psi}{(2S)}}$  seen 325
$\Gamma_{2}$ ${{\mathit \pi}^{\pm}}{{\mathit \psi}{(3770)}}$  not seen 235