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${{\mathit T}_{{{c c {{\overline{\mathit c}}} {{\overline{\mathit c}}}}}}{(6900)}^{0}}$

$I^G(J^{PC})$ = $0^+(2^{+ +})$

was ${{\mathit X}{(6900)}}$

Assuming that all structures seen in the ${{\mathit J / \psi}}{{\mathit J / \psi}}$ final state have the same quantum numbers, CMS determined those to $\mathit J{}^{PC} = 2{}^{++}$ (HAYRAPETYAN 2025AG). State incompatible with a ${{\mathit q}}{{\overline{\mathit q}}}$ structure. See the review on "Heavy Non-${{\mathit q}}{{\overline{\mathit q}}}$ Mesons."

${{\mathit T}_{{{c c {{\overline{\mathit c}}} {{\overline{\mathit c}}}}}}{(6900)}^{0}}$ MASS

$6898$ $\pm12$ MeV (S = 1.2)

${{\mathit T}_{{{c c {{\overline{\mathit c}}} {{\overline{\mathit c}}}}}}{(6900)}^{0}}$ WIDTH

$161$ $\pm26$ MeV

${{\mathit T}_{{{c c {{\overline{\mathit c}}} {{\overline{\mathit c}}}}}}{(6900)}^{0}}$ DECAY MODES

Mode

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

Scale Factor/
Conf. Level

P(MeV/c)

$\Gamma_{1}$

${{\mathit J / \psi}}{{\mathit J / \psi}}$

seen

Except where otherwise noted, content of the 2026 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 and KEK (Japan), INFN (Italy) and CERN. Individual collaborators receive support for their PDG activities from their respective institutes or funding agencies. © 2026. See LBNL disclaimers.

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${{\mathit T}_{{{c c {{\overline{\mathit c}}} {{\overline{\mathit c}}}}}}{(6900)}^{0}}$