String dynamics and metastability of fully-heavy tetraquarks
Abstract
Multiquark states have been advocated to explain recent experimental data in the heavy-light sector, and there are already speculations about multiquarks containing only heavy quarks and antiquarks. With a rigorous treatment of the four-body problem in current quark models, full-charm (cc c c) and full-beauty (bb b b) tetraquarks are found to be unbound. Thus their stability should rely on more subtle effects that are not included in the simple picture of constituent quarks. The case of (bc b c) might be more favorable if the naive color-additive model of confinement is replaced by a string-inspired interaction.
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