The dynamical diquark model: fine structure and isospin

Jesse F. Giron, Richard F. Lebed, Curtis T. Peterson

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


We incorporate fine-structure corrections into the dynamical diquark model of multiquark exotic hadrons. These improvements include effects due to finite diquark size, spin-spin couplings within the diquarks, and most significantly, isospin-dependent couplings in the form of pionlike exchanges assumed to occur between the light quarks within the diquarks. Using a simplified two-parameter interaction Hamiltonian, we obtain fits in which the isoscalar JPC = 1++ state — identified as the X (3872) — appears naturally as the lightest exotic (including all states that are predicted by the model but have not yet been observed), while the closed-charm decays of Zc(3900) and Zc(4020) prefer J/𝜓 and hc modes, respectively, in accord with experiment. We explore implications of this model for the excited tetraquark multiplets and the pentaquarks.

Original languageEnglish (US)
Article number124
JournalJournal of High Energy Physics
Issue number1
StatePublished - Jan 1 2020


  • Phenomenological Models
  • QCD Phenomenology

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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