Heavy Hadronic Molecules Coupled with Multiquark States
We investigate the hidden-charm pentaquarks as a Λ<sub>c</sub>͞D⁽*⁾ – Σ<sub>c</sub>⁽*⁾͞D⁽*⁾ hadronic molecule coupling to a compact five-quark state. The coupling to the compact state leads to an hadron short-range interaction generating an attraction. In addition, the one pi...
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| Autores principales: | , , , , , , |
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| Formato: | Articulo |
| Lenguaje: | Inglés |
| Publicado: |
2021
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| Materias: | |
| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/133719 |
| Aporte de: |
| Sumario: | We investigate the hidden-charm pentaquarks as a Λ<sub>c</sub>͞D⁽*⁾ – Σ<sub>c</sub>⁽*⁾͞D⁽*⁾ hadronic molecule coupling to a compact five-quark state. The coupling to the compact state leads to an hadron short-range interaction generating an attraction. In addition, the one pion exchange potential (OPEP) as a long-range interaction is introduced by the Lagrangians satisfying the chiral and heavy quark spin symmetries. The OPEP has been known as a driving force to bind atomic nuclei, where the tensor term leading the coupled-channel effect generates a strong attraction. The mass degeneracy of heavy hadrons due to the heavy quark spin symmetry enhances the OPEP derived by the πD⁽*⁾͞D⁽*⁾ and πΣ<sub>c</sub>⁽*⁾Σ<sub>c</sub>⁽*⁾ couplings. Introducing those interactions, we consistently explain the masses and widths of the P<sub>c</sub> states reported by LHCb in 2019. The short range interaction has a dominant role to determine the energy-level structures, while the OPEP tensor term does the decay width. |
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