A lattice QCD computation predicts a 2++ J/psi J/psi resonance with mass 6.54 GeV and width 0.54 GeV, identified with the X(6600) structure.
New Structures in the $J/\psi$ $J/\psi$ Mass Spectrum at CMS
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abstract
A search is reported for structures near the $J/\psi$ $J/\psi$ mass threshold using a dataset of proton-proton collisions at $\sqrt{s} \: =13 \: \mathrm{TeV} $ recorded with the CMS detector at the LHC, corresponding to an integrated luminosity of about $135 \: \mathrm{fb^{-1}}$. Two structures are observed with a significance exceeding $5\sigma$ and evidence of an additional structure is reported with a local significance of $4.7\sigma$.
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Tensor Resonance in $J/\psi J/\psi$ Scattering from Lattice QCD
A lattice QCD computation predicts a 2++ J/psi J/psi resonance with mass 6.54 GeV and width 0.54 GeV, identified with the X(6600) structure.