{"@context":"http://schema.org","@id":"https://doi.org/10.17182/hepdata.167853.v1","@reverse":{"isBasedOn":[{"@type":"ScholarlyArticle","identifier":{"@type":"PropertyValue","propertyID":"URL","value":"https://inspirehep.net/literature/3113723"}}]},"@type":"Dataset","additionalType":"Collection","author":{"@type":"Organization","name":"CMS Collaboration"},"creator":{"@type":"Organization","name":"CMS Collaboration"},"datePublished":"2026","description":"Three structures, X (6600), X (6900), and X (7100), have emerged from the J/\u03c8 J/\u03c8 (J/\u03c8 \u2192 \u03bc+\u03bc\u2212) mass spectrum. These are candidates of all-charm tetraquarks, an exotic form of hadronic matter. A clearer picture of these states is obtained using proton-proton collision data collected by the CMS detector that corresponds to 315 fb\u22121, which yields 3.6 times more J/\u03c8 J/\u03c8 pairs than previous studies by CMS. All three structures, and their mutual interference, have statistical significances above five standard deviations. The presence of interference implies that the structures have common quantum numbers. Their squared masses align linearly with a resonance index and have natural widths that systematically decrease as the index increases. These features are consistent with radial excitations of tetraquarks composed of two aligned spin-1 diquarks without orbital excitation, and disfavor other interpretations. The J/\u03c8 \u03c8(2S) \u2192 \u03bc+\u03bc\u2212\u03bc+\u03bc\u2212 decay mode is also explored and the X (6900) and X (7100) states are found with significances exceeding 8 and 4 standard deviations, respectively.","hasPart":[{"@id":"https://doi.org/10.17182/hepdata.167853.v1/t1","@type":"Dataset","description":"Measured masses and widths of the three X states from the fits to the $\\mathrm{J}/\\psi\\mathrm{J}/\\psi$ mass spectrum from the Run...","name":"Table 1 - middle row"},{"@id":"https://doi.org/10.17182/hepdata.167853.v1/t2","@type":"Dataset","description":"Measured masses and widths of the three X states from the fits to the $\\mathrm{J}/\\psi \\psi(2S)$ mass spectrum from the...","name":"Table 1 - last row"},{"@id":"https://doi.org/10.17182/hepdata.167853.v1/t3","@type":"Dataset","description":"The $\\mathrm{J}/\\psi\\mathrm{J}/\\psi$ invariant-mass spectrum covering the full range of the fit: 6.175 - 15.0 GeV.","name":"Figure 3"},{"@id":"https://doi.org/10.17182/hepdata.167853.v1/t4","@type":"Dataset","description":"$\\mathrm{J}/\\psi\\psi(2S)$ invariant-mass spectrum covering the full range of the fit: 6.76 - 15.0 GeV.","name":"Figure 4"},{"@id":"https://doi.org/10.17182/hepdata.167853.v1/t5","@type":"Dataset","description":"Squared masses (GeV^2) versus radial quantum number of (from left to right): the Upsilon family (triangles); the X(6600), X(6900), X(7100)...","name":"Figure 5"},{"@id":"https://doi.org/10.17182/hepdata.167853.v1/t6","@type":"Dataset","description":"Masses and widths obtained from the Regge trajectory fit for the X states shown in Fig. 5 (statistical uncertainties only)....","name":"Figure 5 (Regge fit)"},{"@id":"https://doi.org/10.17182/hepdata.167853.v1/t7","@type":"Dataset","description":"Widths (in MeV) as a function of the radial quantum number. Shown are, from left to right: the total widths...","name":"Figure 6"},{"@id":"https://doi.org/10.17182/hepdata.167853.v1/t8","@type":"Dataset","description":"Comparison of the measured X Regge trajectory with theoretical predictions from spin-0 diquark model for 0++ states with L =...","name":"Figure S4 top left"},{"@id":"https://doi.org/10.17182/hepdata.167853.v1/t9","@type":"Dataset","description":"Comparison of the measured X Regge trajectory with theoretical predictions from spin-1 diquark model for 0++ states with L =...","name":"Figure S4 top right"},{"@id":"https://doi.org/10.17182/hepdata.167853.v1/t10","@type":"Dataset","description":"Comparison of the measured X Regge trajectory with theoretical predictions from spin-1 diquark model for 2++ states with L =...","name":"Figure S4 bottom"},{"@id":"https://doi.org/10.17182/hepdata.167853.v1/t11","@type":"Dataset","description":"Comparison of the measured X Regge trajectory with theoretical predictions from spin-1 diquark model for 0-+ states with L =...","name":"Figure S5 top left"},{"@id":"https://doi.org/10.17182/hepdata.167853.v1/t12","@type":"Dataset","description":"Comparison of the measured X Regge trajectory with theoretical predictions from spin-1 diquark model for 1-+ states with L =...","name":"Figure S5 top right"},{"@id":"https://doi.org/10.17182/hepdata.167853.v1/t13","@type":"Dataset","description":"Comparison of the measured X Regge trajectory with theoretical predictions from spin-1 diquark model for 2-+ states with L =...","name":"Figure S5 bottom"},{"@id":"https://doi.org/10.17182/hepdata.167853.v1/t14","@type":"Dataset","description":"Comparison of the measured X Regge trajectory with theoretical predictions from spin-0, 1 diquark model for (0, 1, 2)++ states...","name":"Figure S6"}],"identifier":[{"@type":"PropertyValue","propertyID":"HEPDataRecord","value":"https://www.hepdata.net/record/ins3113723?version=1"},{"@type":"PropertyValue","propertyID":"HEPDataRecordAlt","value":"https://www.hepdata.net/record/167853"}],"inLanguage":"en","name":"Observation of a family of all-charm tetraquarks","provider":{"@type":"Organization","name":"HEPData"},"publisher":{"@type":"Organization","name":"HEPData"},"url":"https://www.hepdata.net/record/ins3113723?version=1","version":1}