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).
Aadet al.(ATLAS), (2025), arXiv:2509.13101 [hep- ex]
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Using recent four-body quark model wave functions and NRQCD, the authors compute two-photon couplings and UPC cross sections for fully charmed tetraquarks, showing resonant terms exceed continuum in J/ψJ/ψ but not in γγ channels.
LHC di-dijet excesses are attributed to resonant and non-resonant production of b'b'b'b' tetraquarks from fourth-generation quarks of mass ~2 TeV, with dijet resonances from color-octet bound states in a Yukawa potential.
A constituent quark model predicts masses of 1.9, 4.2, and 6.6 GeV for light, charmonium-like, and fully-charm 1^{-+} tetraquarks along with decay ratios for specific two-body channels and rules out η1(1855) as a compact tetraquark.
citing papers explorer
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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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Two photon decay width of the fully charmed tetraquarks: revisiting prospects for ultraperipheral collisions
Using recent four-body quark model wave functions and NRQCD, the authors compute two-photon couplings and UPC cross sections for fully charmed tetraquarks, showing resonant terms exceed continuum in J/ψJ/ψ but not in γγ channels.
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LHC di-dijet excesses as signals of fourth-generation tetraquarks
LHC di-dijet excesses are attributed to resonant and non-resonant production of b'b'b'b' tetraquarks from fourth-generation quarks of mass ~2 TeV, with dijet resonances from color-octet bound states in a Yukawa potential.
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Systematic study of exotic $1^{-+}$ tetraquark spectroscopy
A constituent quark model predicts masses of 1.9, 4.2, and 6.6 GeV for light, charmonium-like, and fully-charm 1^{-+} tetraquarks along with decay ratios for specific two-body channels and rules out η1(1855) as a compact tetraquark.