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A search is reported for near-threshold structures in the J/$\psi$J/$\psi$invariant mass spectrum produced in proton-proton collisions at $\sqrt{s}$ = 13TeV from data collected by the CMS experiment, corresponding to an integratedluminosity of 135 fb$^{-1}$. A new structure is observed with a significanceabove 5 standard deviations at a mass of 6552 $\pm$ 10 (stat) $\pm$ 12 (syst)MeV. Another structure with even higher significance is found at a mass of 6927$\pm$ 9 (stat) $\pm$ 4 (syst) MeV, which is consistent with the X(6900)resonance reported by the LHCb experiment and confirmed by the ATLASexperiment. Evidence for another new structure, with a local significance of4.1 standard deviations, is found at a mass of 7287$^{+20}_{-18}$ (stat) $\pm$5 (syst) MeV. The masses and significances are obtained in a model withoutconsidering possible quantum mechanical interference between the resonances.Incorporating this interference provides a better description of the massspectrum between the resonances and shifts the measured masses by up to 150MeV.

Observation of new structure in the J/$\psi$J/$\psi$ mass spectrum in proton-proton collisions at $\sqrt{s}$ = 13 TeV