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Tetraquarks in the 1/N expansion and meson-meson resonances
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Diquarks are found to have the right degrees of freedom to describe the tetraquark poles in hidden-charm to open-charm meson-meson amplitudes. Compact tetraquarks result as intermediate states in non-planar diagrams of the 1/N expansion and the corresponding resonances are narrower than what estimated before. The proximity of tetraquarks to meson-thresholds has an apparent role in this analysis and, in the language of meson molecules, an halving rule in the counting of states is obtained.
Forward citations
Cited by 3 Pith papers
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Cluster reducibility of multiquark operators
Gauge-invariant multiquark operators decompose into products of ordinary hadronic operators, which rules out fully compact multiquark bound states.
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Flavour-Exotic Tetraquarks in Large-$N_{\rm c}$ QCD: Do They Exist?
Large-Nc QCD requires two flavour-exotic tetraquark states, but only one compact diquark-antidiquark configuration exists, so compact flavour-exotic tetraquarks likely do not exist.
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Tetraquark-Adequate QCD Sum Rules
QCD sum rules for tetraquarks should exclude unconnected meson-meson contributions; the corrected rules retain only diagrams of order alpha_s^2 or higher.
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