For fully-heavy bbcc and bcbc tetraquarks, the chiral quark model finds no bound states but predicts several resonances above the two-meson thresholds.
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Fully-heavy tetraquarks: $bb\bar{c}\bar{c}$ and $bc\bar{b}\bar{c}$
For fully-heavy bbcc and bcbc tetraquarks, the chiral quark model finds no bound states but predicts several resonances above the two-meson thresholds.