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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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.