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

${{\mathit \psi}{(4660)}}$

$I^G(J^{PC})$ = $0^-(1^{- -})$ 

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   $4641 \pm10$ MeV (S = 2.7)
${{\mathit \psi}{(4660)}}$ WIDTH   $73 {}^{+13}_{-11}$ MeV (S = 1.7)
$\Gamma_{1}$ ${{\mathit e}^{+}}{{\mathit e}^{-}}$   not seen 2321
$\Gamma_{2}$ ${{\mathit \psi}{(2S)}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$   seen 819
$\Gamma_{3}$ ${{\mathit J / \psi}}{{\mathit \eta}}$   not seen 1201
$\Gamma_{4}$ ${{\mathit D}^{0}}{{\mathit D}^{*-}}{{\mathit \pi}^{+}}$   not seen 1165
$\Gamma_{5}$ ${{\mathit D}^{*0}}{{\mathit D}^{*-}}{{\mathit \pi}^{+}}$   seen 1032
$\Gamma_{6}$ ${{\mathit \psi}_{{{2}}}{(3823)}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$   seen 701
$\Gamma_{7}$ ${{\mathit \chi}_{{{c1}}}}{{\mathit \gamma}}$   not seen 993
$\Gamma_{8}$ ${{\mathit \chi}_{{{c1}}}}{{\mathit \phi}}$   not seen 426
$\Gamma_{9}$ ${{\mathit \chi}_{{{c2}}}}{{\mathit \gamma}}$   not seen 958
$\Gamma_{10}$ ${{\mathit \chi}_{{{c2}}}}{{\mathit \phi}}$   not seen 326
$\Gamma_{11}$ ${{\mathit \Lambda}_{{{c}}}^{+}}{{\mathit \Lambda}_{{{c}}}^{-}}$   seen 397
$\Gamma_{12}$ ${{\mathit D}_{{{s}}}^{+}}{{\mathit D}_{{{s1}}}{(2536)}^{-}}$   seen 557
$\Gamma_{13}$ ${{\mathit D}_{{{s}}}^{+}}{{\mathit D}_{{{s2}}}^{*}{(2573)}^{-}}$   seen  
$\Gamma_{14}$ ${{\mathit \omega}}{{\mathit \pi}^{0}}$   not seen 2253
$\Gamma_{15}$ ${{\mathit \omega}}{{\mathit \eta}}$   not seen 2220
$\Gamma_{16}$ ${{\mathit \Xi}^{-}}{{\overline{\mathit \Xi}}^{+}}$   not seen 1908
$\Gamma_{17}$ ${{\mathit p}}{{\mathit K}^{-}}{{\overline{\mathit \Lambda}}}$ + c.c.   not seen 1935