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

INSPIRE JSON (beta) PDGID:

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

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

Quantum numbers are quark model predictions.

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

$3637.7 \pm1.1$ MeV (S = 1.2)

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

$13.9 \pm2.6$ MeV

${{\mathit \eta}_{{c}}{(2S)}}$ 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 ${{\mathit \pi}^{-}}$

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

$<1.9\times 10^{-3}$

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

$(1.3\pm{0.9})\%$

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

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

$<2.9\times 10^{-3}$

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

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

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

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

$(1.0\pm{0.8})\%$

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

$<1.3\times 10^{-3}$

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

$<1.1\times 10^{-3}$

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

$<2.0\times 10^{-3}$

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

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

$(1.6\pm{1.0})\times 10^{-4}$

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

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

$<6\times 10^{-3}$

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

$(2.6\pm{1.9})\times 10^{-3}$

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

FOOTNOTES

Except where otherwise noted, content of the 2023 Review of Particle Physics is licensed under a Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) license. The publication of the Review of Particle Physics is supported by US DOE, MEXT (Japan), INFN (Italy), JPS and CERN. Individual collaborators receive support for their PDG activities from their respective institutes or funding agencies. © 2023. See LBNL disclaimers.