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

${{\boldsymbol X}{(4050)}^{\pm}}$ $I^G(J^{PC})$ = $1^-(?^{? +})$

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 
$\Gamma_{1}$ ${{\mathit \pi}^{+}}{{\mathit \chi}_{{c1}}{(1P)}}$ seen487