Doubly heavy tetraquark resonant states

Qi Meng, Masayasu Harada, Emiko Hiyama, Atsushi Hosaka, Makoto Oka

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)


Spectrum of the doubly heavy tetraquarks, bbq¯q¯, is studied in a constituent quark model. Four-body problem is solved in a variational method where the real scaling technique is used to identify resonant states above the fall-apart decay thresholds. In addition to the two bound states that were reported in the previous study we have found several narrow resonant states above the BB and BB thresholds. Their structures are studied and are interpreted by the quark dynamics. A narrow resonance with spin-parity JP=1+ is found to be a mixed state of a compact tetraquark and a BB scattering state. This is driven by a strong color Coulombic attraction between the bb quarks. Negative-parity excited resonances with JP=0, 1 and 2 form a triplet under the heavy-quark spin symmetry. It turns out that they share a similar structure to the λ-mode of a singly heavy baryon as a result of the strongly attractive correlation for the doubly heavy diquark.

Original languageEnglish
Article number136800
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Publication statusPublished - 2022 Jan 10


  • Doubly heavy tetraquark
  • Few-body problem
  • Quark model
  • Resonant states


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