${\boldsymbol {\boldsymbol c}}$ ${\boldsymbol {\overline{\boldsymbol c}}}$ 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

Decay Modes

$\Gamma_{1}$

${{\mathit \pi}^{+}}{{\mathit \psi}{(2S)}}$

seen

325

$\Gamma_{2}$

${{\mathit \pi}^{\pm}}{{\mathit \psi}{(3770)}}$

not seen

235