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.
The possible tetraquark states $cc \bar c \bar c$ observed by the LHCb experiment
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We give a brief comment on the possible tetraquark states $cc \bar c \bar c$ observed by the LHCb experiment.
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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.