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The Simple Spectrum of cbar c cbar c States in the Dynamical Diquark Model
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The Simple Spectrum of cbar c cbar c States in the Dynamical Diquark Model
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We develop the spectroscopy of $c\bar c c\bar c$ and other all-heavy tetraquark states in the dynamical diquark model. In the most minimal form of the model (e.g., each diquark appears only in the color-triplet combination; the non-orbital spin couplings connect only quarks within each diquark), the spectroscopy is extremely simple. Namely, the $S$-wave multiplets contain precisely 3 degenerate states ($0^{++}$, $1^{+-}$, $2^{++}$) and the 7 $P$-wave states satisfy an equal-spacing rule when the tensor coupling is negligible. When comparing numerically to the recent LHCb results, we find the best interpretation is assigning $X(6900)$ to the $2S$ multiplet, while a lower state suggested at about $6740$ MeV fits well with the members of the $1P$ multiplet. We also predict the location of other multiplets ($1S$, $1D$, etc.) and discuss the significance of the $cc$ open-flavor threshold.
Forward citations
Cited by 7 Pith papers
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Predictions for the scalar partner of the LHC tetraquark $X(6600)$
The paper predicts a scalar cc-ccbar tetraquark state (X(6400)) and identifies it as the partner to the recently observed tensor state X(6600).
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Next-to-leading order QCD corrections to electromagnetic production and decay of fully charm tetraquarks
The first NLO QCD corrections to fully charm tetraquark → γγ decay are given, with photon-fusion production cross sections predicted.
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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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Symmetry Analysis of Compact Tetraquark States and Implications for the Level Ordering of the Fully Charmed Candidates $X(6600)$, $X(6900)$, and $X(7100)$
Counting symmetry-allowed states up to orbital angular momentum L=3 predicts low-lying compact tetraquarks prefer J^P=2^+, matching the observed 2^{++} fully charmed X states.
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The $T_{bc}$ tetraquarks near the $B\bar{D}$ threshold
The 0+ T_bc tetraquark is predicted near the B D-bar threshold while the 1+ state appears as an S-wave resonance 23-28 MeV above the B* D-bar threshold, with masses 7.143-7.222 GeV.
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Enhanced evidence of $X(7200)$ and improved measurements of $X(6900)$ parameters from a combined LHCb-ATLAS-CMS analysis
Simultaneous fits to LHCb-ATLAS-CMS data raise X(7200) evidence to 3.7–6.6σ (best 6.6σ) while confirming X(6900) at >12σ with improved mass and width precision.
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Enhanced evidence of $X(7200)$ and improved measurements of $X(6900)$ parameters from a combined LHCb-ATLAS-CMS analysis
A combined fit to LHCb, ATLAS, and CMS di-J/ψ data finds >12σ evidence for X(6900) and 3.7–6.6σ evidence for X(7200), with interference effects playing a critical role.
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