A theory of X and Z multiquark resonances

Autor: Luciano Maiani, Antonio D. Polosa, Veronica Riquer
Jazyk: angličtina
Rok vydání: 2018
Předmět:
Zdroj: Physics Letters B, Vol 778, Iss C, Pp 247-251 (2018)
Druh dokumentu: article
ISSN: 0370-2693
1873-2445
DOI: 10.1016/j.physletb.2018.01.039
Popis: 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.
Databáze: Directory of Open Access Journals
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