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

${{\boldsymbol X}{(4050)}^{\pm}}$

$I^G(J^{PC})$ = $1^-(?^{? +})$ 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. Observed by MIZUK 2008 in the ${{\mathit \pi}^{+}}{{\mathit \chi}_{{c1}}{(1P)}}$ invariant mass distribution in ${{\overline{\mathit B}}^{0}}$ $\rightarrow$ ${{\mathit K}^{-}}{{\mathit \pi}^{+}}{{\mathit \chi}_{{c1}}{(1P)}}$ decays. Not seen by LEES 2012B in this same mode after accounting for ${{\mathit K}}{{\mathit \pi}}$ resonant mass and angular structure.
${{\mathit X}{(4050)}^{\pm}}$ MASS   $4051 {}^{+24}_{-40}$ MeV 
 
${{\mathit X}{(4050)}^{\pm}}$ WIDTH   $82 {}^{+50}_{-28}$ MeV 
 
$\Gamma_{1}$ ${{\mathit \pi}^{+}}{{\mathit \chi}_{{c1}}{(1P)}}$  seen 487
 
$\Gamma_{2}$ ${{\mathit \pi}^{\pm}}{{\mathit \psi}{(3770)}}$  not seen 231
 
FOOTNOTES