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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 PDGID:

M026

${{\mathit \eta}_{{{c}}}{(1S)}}$

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

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${{\mathit \eta}_{{{c}}}{(1S)}}$ MASS

$2984.1$ $\pm0.4$ MeV (S = 1.2)

${{\mathit \eta}_{{{c}}}{(1S)}}$ WIDTH

$30.5$ $\pm0.5$ MeV (S = 1.1)

${{\mathit \eta}_{{{c}}}{(1S)}}$ DECAY MODES

Mode

Fraction ($\Gamma_i$ / $\Gamma$)

Scale Factor/
Conf. Level

P(MeV/c)

▸ Decays involving hadronic resonances

▸ Decays into stable hadrons

▸ Radiative decays

▸ Charge conjugation ($\mathit C$), Parity ($\mathit P$), Lepton Family number ($\mathit LF$) violating modes

Constrained Fit information

Except where otherwise noted, content of the 2025 Review of Particle Physics is licensed under a Creative Commons Attribution 4.0 International (CC BY 4.0) license. The publication of the Review of Particle Physics is supported by US DOE, MEXT (Japan), INFN (Italy) and CERN. Individual collaborators receive support for their PDG activities from their respective institutes or funding agencies. © 2025. See LBNL disclaimers.

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${{\mathit \eta}_{{{c}}}{(1S)}}$