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

${{\boldsymbol \eta}_{{c}}{(2S)}}$ $I^G(J^{PC})$ = $0^+(0^{- +})$

Quantum numbers are quark model predictions.
${{\mathit \eta}_{{c}}{(2S)}}$ MASS   $3637.6 \pm1.2$ MeV (S = 1.2)
${{\mathit \eta}_{{c}}{(2S)}}$ WIDTH   $11.3 {}^{+3.2}_{-2.9}$ MeV 
$\Gamma_{1}$ hadrons not seen
$\Gamma_{2}$ ${{\mathit K}}{{\overline{\mathit K}}}{{\mathit \pi}}$ $(1.9\pm{1.2})\%$1729
$\Gamma_{3}$ ${{\mathit K}}{{\overline{\mathit K}}}{{\mathit \eta}}$ $(5\pm{4})\times 10^{-3}$1637
$\Gamma_{4}$ 2 ${{\mathit \pi}^{+}}$2 ${{\mathit \pi}^{-}}$ not seen1792
$\Gamma_{5}$ ${{\mathit \rho}^{0}}{{\mathit \rho}^{0}}$ not seen1645
$\Gamma_{6}$ 3 ${{\mathit \pi}^{+}}$3 ${{\mathit \pi}^{-}}$ not seen1749
$\Gamma_{7}$ ${{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ not seen1700
$\Gamma_{8}$ ${{\mathit K}^{*0}}{{\overline{\mathit K}}^{*0}}$ not seen1585
$\Gamma_{9}$ ${{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$ $(1.4\pm{1.0})\%$1667
$\Gamma_{10}$ ${{\mathit K}^{+}}{{\mathit K}^{-}}$2 ${{\mathit \pi}^{+}}$2 ${{\mathit \pi}^{-}}$ not seen1627
$\Gamma_{11}$ ${{\mathit K}_S^0}$ ${{\mathit K}^{-}}$2 ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ + c.c. seen1666
$\Gamma_{12}$ 2 ${{\mathit K}^{+}}$2 ${{\mathit K}^{-}}$ not seen1470
$\Gamma_{13}$ ${{\mathit \phi}}{{\mathit \phi}}$ not seen1506
$\Gamma_{14}$ ${{\mathit p}}{{\overline{\mathit p}}}$ seen1558
$\Gamma_{15}$ ${{\mathit \gamma}}{{\mathit \gamma}}$ $(1.9\pm{1.3})\times 10^{-4}$1819
$\Gamma_{16}$ ${{\mathit \gamma}}{{\mathit J / \psi}{(1S)}}$ $<1.4\%$CL=90%500
$\Gamma_{17}$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \eta}}$ not seen1766
$\Gamma_{18}$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \eta}^{\,'}}$ not seen1680
$\Gamma_{19}$ ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \eta}_{{c}}{(1S)}}$ $<25\%$CL=90%538