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

${{\boldsymbol R}_{{c0}}{(4240)}}$ $I^G(J^{PC})$ = $1^+(0^{- -})$ I, G, C need confirmation.

was ${{\mathit X}{(4240)}^{\pm}}$
Properties incompatible with a ${{\mathit q}}{{\overline{\mathit q}}}$ structure (exotic state). See the review on non- ${{\mathit q}}{{\overline{\mathit q}}}$ states. Spin and parity assigment $\mathit J{}^{P} = 0{}^{-}$ is favored over ${}^{}1{}^{-}$, ${}^{}2{}^{-}$, and ${}^{}2{}^{+}$ by 8 $\sigma $ and over ${}^{}1{}^{+}$ by 1 $\sigma $, according to the four-dimensional amplitude analysis of AAIJ 2014AG.
${{\mathit R}_{{c0}}{(4240)}}$ MASS   $4239 {}^{+50}_{-21}$ MeV 
${{\mathit R}_{{c0}}{(4240)}}$ WIDTH   $220 {}^{+120}_{-90}$ MeV 
$\Gamma_{1}$ ${{\mathit \pi}^{-}}{{\mathit \psi}{(2S)}}$  seen 500