Stability of Heavy Tetraquarks
Abstract
We discuss the stability of tetraquark systems with two different masses. After some reminders about the stability of very asymmetric \(QQ{\bar{q}} {\bar{q}}\) tetraquarks, we demonstrate that in the all-heavy limit \(q \rightarrow Q\) , the system becomes unstable for standard color-additive models. We also analyze the consequences of symmetry breaking for \(Qq{\bar{Q}}{\bar{q}}\) configurations: we find a kind of metastability between the lowest threshold \(Q{\bar{Q}} + q{\bar{q}}\) and the highest one, \(Q{\bar{q}}+{\bar{Q}} q\) , and we calculate the width of the resonance. Our results are consistent with the experimental observation of narrow hadrons lying well above their lowest decay threshold.
Publisher URL: https://link.springer.com/article/10.1007/s00601-018-1331-9
DOI: 10.1007/s00601-018-1331-9
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