A radius-dependent chromoelectric interaction in the MIT bag model predicts that the state T_ncs̄n̄(0+, 2.925) is a compact tetraquark candidate corresponding to the experimentally observed T_c̄s0^a(2900).
Interpretation of structure in the di-$J/\psi$ spectrum
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abstract
Structure in the di-$J/\psi$ mass spectrum observed by the LHCb experiment around 6.9 and 7.2 GeV is interpreted in terms of $J^{PC}=0^{++}$ and $2^{++}$ resonances between a $cc$ diquark and a $\bar c \bar c$ antidiquark, using a recently confirmed string-junction picture to calculate tetraquark masses. The main peak around 6.9 GeV is likely dominated by the $0^{++}(2S)$ state, a radial excitation of the $cc$-$\bar c \bar c$ tetraquark, which we predict at $6.871\pm 0.025$ GeV. The dip around 6.75 GeV is ascribed to the opening of the \Swave\ di-$\chi_{c0}$ channel, while the dip around 7.2 GeV could be correlated with the opening of the di-$\eta_c(2S)$ or $\Xi_{cc} \bar \Xi_{cc}$ channel. The low-mass part of the di-$J/\psi$ structure appears to require a broad resonance consistent with a predicted $2^{++}(1S)$ state with invariant mass around $M_{\rm inv} = 6400$ MeV. Implications for $bb \bar b \bar b$ tetraquarks are discussed.
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hep-ph 2representative citing papers
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.
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Compactness, mass spectra, and strong stability of singly heavy tetraquarks
A radius-dependent chromoelectric interaction in the MIT bag model predicts that the state T_ncs̄n̄(0+, 2.925) is a compact tetraquark candidate corresponding to the experimentally observed T_c̄s0^a(2900).
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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.