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Nature of $X(6900)$ and its production mechanism at LHCb
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abstract
We show that the Pomeron exchanges play a unique role in vector charmonium scatterings. Such a mechanism can provide a natural explanation for the nontrivial structures in the di-$J/\psi$ spectrum observed by the LHCb Collaboration. The narrow structure $X(6900)$, as a dynamically generated resonance pole, can arise from the Pomeron exchanges and coupled-channel effects between the $J/\psi$-$J/\psi$, $J/\psi$-$\psi(2S)$ scatterings. A pole structure near the di-$J/\psi$ threshold is also found. Meanwhile, we predict that $X(6900)$ can produce significant threshold enhancement in the $J/\psi$-$\psi(2S)$ energy spectrum which can be searched for at LHCb.
Forward citations
Cited by 3 Pith papers
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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.
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$\eta_c\eta_c$ and $J/\psi J/\psi$ scatterings from lattice QCD
Lattice QCD predicts a broad J/psi J/psi 2++ resonance with mass about 6.54 GeV and width about 0.55 GeV, compatible with X(6600) and X(6400), plus a 0++ virtual state near threshold.
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Symmetry Analysis of Compact Tetraquark States and Implications for the Level Ordering of the Fully Charmed Candidates $X(6600)$, $X(6900)$, and $X(7100)$
Symmetry analysis of compact tetraquarks shows low-energy states favor J^P=2+ and places X(6600), X(6900), X(7100) among the lower levels of the fully charmed spectrum.
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