Tetraquarks in the 1/N expansion and meson-meson resonances

Abstract

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.

10 pages, 10 figures, references and comments added, minor corrections made, to appear in JHEP

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• Four-Quark Hadrons: an Updated Review
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• Tetraquarks, Pentaquarks and Dibaryons in the large $N$ QCD
• Exotic Tetraquark Mesons in Large-$N_c$ Limit: an Unexpected Great Surprise
• OPE and quark-hadron duality for two-point functions of tetraquark currents in $1/N_c$ expansion
• Mission Target: Exotic Multiquark Hadrons -- Sharpened Blades
• Compact Exotic Tetraquark Mesons in Large-$N_c$ QCD
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• Exotic polyquark states and their properties in QCD
• Mission Target: Tetraquark Mesons of Flavour-Cryptoexotic Type
• Meson scattering and tetraquarks in two-dimensional QCD