Tetraquarks, Pentaquarks and Dibaryons in the large $N$ QCD
| Autor: | Wei Wang, Luciano Maiani, Veronica Riquer |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Particle physics
Physics and Astronomy (miscellaneous) High Energy Physics::Lattice Hadron Nuclear Theory FOS: Physical sciences lcsh:Astrophysics 01 natural sciences High Energy Physics - Experiment High Energy Physics - Experiment (hep-ex) High Energy Physics - Phenomenology (hep-ph) lcsh:QB460-466 0103 physical sciences lcsh:Nuclear and particle physics. Atomic energy. Radioactivity Limit (mathematics) 010306 general physics Nuclear Experiment Engineering (miscellaneous) Quantum chromodynamics Physics Series (mathematics) 010308 nuclear & particles physics High Energy Physics::Phenomenology Observable Baryon High Energy Physics - Phenomenology Excited state lcsh:QC770-798 High Energy Physics::Experiment |
| Zdroj: | European Physical Journal European Physical Journal C: Particles and Fields, Vol 78, Iss 12, Pp 1-10 (2018) |
| Popis: | We study the multiquark hadrons in large $N$ QCD under the 't-Hooft limit, extending Witten's picture of the baryons. We explore the decay widths of tetraquarks, pentaquarks and dibaryons. Based on the decay behaviors, we point out in the $N\to \infty$ limit decay widths of tetraquarks stay constant, while those of pentaquarks and dibaryons above certain thresholds can diverge. In the large $N$ limit, we find that the ground states of the three spectroscopic series are stable or narrow and that the excited states of pentaquarks and dibaryons above the indicated thresholds are not observables. We compare our results with those obtained in a different large $N$ generalization of tetraquarks. 9 pages, 6 figures; v2: discussions on phase space added in the appendix |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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