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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:

${{\mathit \psi}{(2S)}}$

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

See the Review on ``${{\mathit \psi}{(2S)}}$ and ${{\mathit \chi}_{{c}}}$ branching ratios'' before the ${{\mathit \chi}_{{c0}}{(1P)}}$ Listings.

${{\mathit \psi}{(2S)}}$ MASS

$3686.10 \pm0.06$ MeV (S = 5.9)

${\mathit m}_{{{\mathit \psi}{(2S)}}}–{\mathit m}_{{{\mathit J / \psi}{(1S)}}}$

$589.188 \pm0.028$ MeV

${{\mathit \psi}{(2S)}}$ WIDTH

▸	MULTIPOLE AMPLITUDE RATIOS IN RADIATIVE DECAYS ${{\mathit \psi}{(2S)}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \chi}_{{cJ}}{(1P)}}$ and ${{\mathit \chi}_{{cJ}}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit J / \psi}{(1S)}}$

${{\mathit \psi}{(2S)}}$ DECAY MODES ▸ Expand all decays

$(97.85\pm{0.13})\%$

virtual ${{\mathit \gamma}}$ $\rightarrow$ hadrons

$(1.73\pm{0.14})\%$

${{\mathit g}}{{\mathit g}}{{\mathit g}}$

$(10.6\pm{1.6})\%$

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

$(1.03\pm{0.29})\%$

$(15.4\pm{1.5})\%$

${{\mathit K}_S^0}$ anything

$(16.0\pm{1.1})\%$

${{\mathit e}^{+}}{{\mathit e}^{-}}$

$(7.93\pm{0.17})\times 10^{-3}$

${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$

$(8.0\pm{0.6})\times 10^{-3}$

${{\mathit \tau}^{+}}{{\mathit \tau}^{-}}$

$(3.1\pm{0.4})\times 10^{-3}$

▸	Decays into ${{\mathit J / \psi}{(1S)}}$ and anything

▸	Hadronic decays

▸	Radiative decays

▸	Weak decays

▸	Other decays

FOOTNOTES

Constrained Fit information

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.