Heavy Hadronic Molecules Coupled with Multiquark States

• Autores: Yamaguchi, Yasuhiro; García Tecocoatzi, Hugo; Giachino, Alessandro; Hosaka, Atsushi; Santopinto, Elena; Takeuchi, Sachiko; Takizawa, Makoto
• Año de publicación: 2021
• Idioma: inglés
• Tipo de recurso: artículo
• Materia: Ciencias Exactas; hidden-charm pentaquarks; hadronic molecules
• Institución: Universidad Nacional de La Plata

We investigate the hidden-charm pentaquarks as a Λ_c͞D⁽*⁾ – Σ_c⁽*⁾͞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_c⁽*⁾Σ_c⁽*⁾ couplings. Introducing those interactions, we consistently explain the masses and widths of the P_c 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.
Facultad de Ciencias Exactas