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

#### ${{\boldsymbol \psi}{(4660)}}$

$I^G(J^{PC})$ = $0^-(1^{- -})$

also known as ${{\mathit Y}{(4660)}}$; was ${{\mathit X}{(4660)}}$
This state shows properties different from a conventional ${{\mathit q}}{{\overline{\mathit q}}}$ state. A candidate for an exotic structure. See the review on non- ${{\mathit q}}{{\overline{\mathit q}}}$ states. Seen in radiative return from ${{\mathit e}^{+}}{{\mathit e}^{-}}$ collisions at $\sqrt {s }$ = $9.54 - 10.58$ GeV by WANG 2007D. Also obtained in a combined fit of WANG 2007D, AUBERT 2007S, and LEES 2014F. See also the review on "Spectroscopy of mesons containing two heavy quarks."
 ${{\mathit \psi}{(4660)}}$ MASS $4630 \pm6$ MeV (S = 1.4)
 ${{\mathit \psi}{(4660)}}$ WIDTH $62 {}^{+9}_{-7}$ MeV
 $\Gamma_{1}$ ${{\mathit e}^{+}}{{\mathit e}^{-}}$ not seen 2315
 $\Gamma_{2}$ ${{\mathit \psi}{(2S)}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ seen 809
 $\Gamma_{3}$ ${{\mathit J / \psi}}{{\mathit \eta}}$ not seen 1192
 $\Gamma_{4}$ ${{\mathit D}^{0}}{{\mathit D}^{*-}}{{\mathit \pi}^{+}}$ not seen 1153
 $\Gamma_{5}$ ${{\mathit \chi}_{{c1}}}{{\mathit \gamma}}$ not seen 984
 $\Gamma_{6}$ ${{\mathit \chi}_{{c2}}}{{\mathit \gamma}}$ not seen 949
 $\Gamma_{7}$ ${{\mathit \Lambda}_{{c}}^{+}}{{\mathit \Lambda}_{{c}}^{-}}$ seen 362
 $\Gamma_{8}$ ${{\mathit D}_{{s}}^{+}}{{\mathit D}_{{s1}}{(2536)}^{-}}$ seen 533
 $\Gamma_{9}$ ${{\mathit D}_{{s}}^{+}}{{\mathit D}_{{s2}}^{*}{(2573)}^{-}}$
 FOOTNOTES