Article Dans Une Revue Few-Body Systems Année : 2018

Stability of Heavy Tetraquarks

A. Valcarce
  • Fonction : Auteur
J. Vijande
  • Fonction : Auteur
H. Garcilazo
  • Fonction : Auteur

Résumé

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.

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Dates et versions

hal-01714272 , version 1 (21-02-2018)

Identifiants

Citer

A. Valcarce, J. Vijande, J.M. Richard, H. Garcilazo. Stability of Heavy Tetraquarks. Few-Body Systems, 2018, 59 (2), pp.9. ⟨10.1007/s00601-018-1331-9⟩. ⟨hal-01714272⟩
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