Fully-heavy tetraquark spectroscopy in the relativistic quark model
| Autor: | Faustov, R. N., Galkin, V. O., Savchenko, E. M. |
|---|---|
| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | Symmetry 2022, 14(12), 2504 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.3390/sym14122504 |
| Popis: | Masses of the ground and excited (1P, 2S, 1D, 2P, 3S) states of the fully-heavy tetraquarks, composed of charm ($c$) and bottom ($b$) quarks and antiquarks, are calculated in the diquark-antidiquark picture within the relativistic quark model based on the quasipotential approach and quantum chromodynamics. The quasipotentials of the quark-quark and diquark-antidiquark interactions are constructed similarly to the previous consideration of mesons and baryons. Relativistic effects are consistently taken into account. A tetraquark is considered as a bound state of a diquark and an antidiquark. The finite size of the diquark is taken into account, using the form factors of the diquark-gluon interaction. It is shown that most of the investigated states of tetraquarks lie above the decay thresholds into a meson pair, as a result they can be observed only as broad resonances. The narrow state X(6900) recently discovered in the di-$J/\psi$ production spectrum by the LHCb, CMS and ATLAS Collaborations corresponds to an excited state of the fully-charmed tetraquark. Other recently discovered exotic heavy resonances X(6200), X(6400), X(6600), X(7200), X(7300) can also be interpreted as the different excitations of the fully-charmed tetraquark. Comment: 36 pages, 2 figures |
| Databáze: | arXiv |
| Externí odkaz: |
|