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

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

Quantum numbers are quark model predictions.

${{\mathit \eta}_{{c}}{(2S)}}$ MASS

$3637.5 \pm1.1$ MeV (S = 1.2)

${{\mathit \eta}_{{c}}{(2S)}}$ WIDTH

$11.3 {}^{+3.2}_{-2.9}$ MeV

Decay Modes

${{\mathit K}}{{\overline{\mathit K}}}{{\mathit \pi}}$

$(1.9\pm{1.2})\%$

${{\mathit K}}{{\overline{\mathit K}}}{{\mathit \eta}}$

$(5\pm{4})\times 10^{-3}$

2 ${{\mathit \pi}^{+}}$2 ${{\mathit \pi}^{-}}$

${{\mathit \rho}^{0}}{{\mathit \rho}^{0}}$

3 ${{\mathit \pi}^{+}}$3 ${{\mathit \pi}^{-}}$

${{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$

${{\mathit K}^{*0}}{{\overline{\mathit K}}^{*0}}$

${{\mathit K}^{+}}{{\mathit K}^{-}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \pi}^{0}}$

$(1.4\pm{1.0})\%$

${{\mathit K}^{+}}{{\mathit K}^{-}}$2 ${{\mathit \pi}^{+}}$2 ${{\mathit \pi}^{-}}$

${{\mathit K}_S^0}$ ${{\mathit K}^{-}}$2 ${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$ + c.c.

2 ${{\mathit K}^{+}}$2 ${{\mathit K}^{-}}$

${{\mathit \phi}}{{\mathit \phi}}$

${{\mathit p}}{{\overline{\mathit p}}}$

${{\mathit p}}{{\overline{\mathit p}}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}$

${{\mathit \gamma}}{{\mathit \gamma}}$

$(1.9\pm{1.3})\times 10^{-4}$

${{\mathit \gamma}}{{\mathit J / \psi}{(1S)}}$

${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \eta}}$

${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \eta}^{\,'}}$

${{\mathit \pi}^{+}}{{\mathit \pi}^{-}}{{\mathit \eta}_{{c}}{(1S)}}$