pdgLive Home   >   ${\mathit {\mathit c}}{\mathit {\overline{\mathit c}}}$ MESONS   >   ${{\mathit X}{(4055)}^{\pm}}$

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

INSPIRE

${{\mathit X}{(4055)}^{\pm}}$ $I^G(J^{PC})$ = $1^+(?^{? -})$ 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

${{\mathit X}{(4055)}^{\pm}}$ Decay Modes
Mode   Fraction ($\Gamma_i$ / $\Gamma$) Scale Factor/ Conf. Level P(MeV/c)   $\Gamma_{1}$ ${{\mathit \pi}^{+}}{{\mathit \psi}{(2S)}}$   seen 325   $\Gamma_{2}$ ${{\mathit \pi}^{\pm}}{{\mathit \psi}{(3770)}}$   not seen 235
FOOTNOTES