2017/12/31 by Luciano Maiani, L. Maiani, A. D. Polosa +2
Physics and Astronomy · #Atomic physics #Baryon #Charm (quantum number) #Cold Atom Physics and Bose-Einstein Condensates #Diquark #Hyperfine structure #Isospin #Meson #Nuclear physics #Particle physics #Pentaquark #Physics #Quantum Chromodynamics and Particle Interactions #Quantum chaos and dynamical systems #Resonance (particle physics) #Tetraquark #X(3872) #hep-ph
paper · pdf · doi:10.1016/j.physletb.2018.01.039
6 pages, 2 figures, some points clarified. To appear in PLB
arxiv created 2018/01/13 · openalex publication_date 2018/01/28 · arxiv updated 2018/02/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We introduce the hypothesis that diquarks and antidiquarks in tetraquarks are separated by a potential barrier. We show that this notion can answer satisfactorily long standing questions challenging the diquark–antidiquark model of exotic resonances. The tetraquark description of X and Z resonances is shown to be compatible with present limits on the non-observation of charged partners X±, of the X(3872) and the absence of a hyperfine splitting between two different neutral states. In the same picture, Zc and Zb particles are expected to form complete isospin triplets plus singlets. It is also explained why the decay rate into final states including quarkonia are suppressed with respect to those having open charm/beauty states.