Roper-like singly heavy baryons in a chiral model


  • Daiki Suenaga RCNP, Osaka University



Singly heavy baryons; chiral symmetry; pentaquark picture


We investigate the Roper-like singly heavy baryons such as Λc(2765) and Ξc(2967) in a chiral model. Based on chiral symmetry of diquarks inside the baryons, we propose that the Roper-like baryons are mostly pentaquark states (Qqqqq¯ ) while the corresponding ground-state ones Λc(2286) and Ξc(2470) are three-quark states (Qqq). Besides, the mass spectrum of negative-parity Λc and Ξc which are heavy quark spin-singlet is predicted by the linear representation of chiral symmetry. We also derive a sum rule of the heavy baryon masses and an extended Goldberger-Treiman relation. In addition to them, we demonstrate the parity-partner structure of the Λc’s and Ξc’s by showing mass degeneracies of them at the chiral restoration point. We expect that the present investigation leads to a better understanding of the diquarks inside hadrons from the viewpoint of chiral symmetry.


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How to Cite

Suenaga D. Roper-like singly heavy baryons in a chiral model. Supl. Rev. Mex. Fis. [Internet]. 2022 Jul. 29 [cited 2024 May 29];3(3):0308025 1-5. Available from: