A holographic model predicts double-heavy tetraquarks as Efimov-like bound states of a heavy meson and a sphaleron in the Sakai-Sugimoto model.
The meson effective theory is chiefly chiral, consisting of the light mesons
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Holographic tetraquarks and the newly observed $T_{cc}^{+}$ at LHCb
A holographic model predicts double-heavy tetraquarks as Efimov-like bound states of a heavy meson and a sphaleron in the Sakai-Sugimoto model.