Decays of Roper-like singly heavy baryons in a chiral model

Abstract

We present a chiral model describing decays of the Roper-like ${\Lambda }_c(2765)$ and ${\Xi }_c(2970)$ as well as those of the heavy quark spin-doublet $\{{\Sigma }_c(2455),{\Sigma }_c(2520)\}$ and $\{{\Xi }_c^{\prime },{\Xi }_c(2645)\}$, by focusing on chiral representations of diquarks inside the heavy baryons. Based on our chiral model together with the heavy quark spin symmetry, we derive a relation satisfied by axial charges of the heavy baryons that controls magnitude of their one pion (kaon) decays. Besides, it is shown that the large decay widths of the Roper-like ${\Lambda }_c(2765)$ and ${\Xi }_c(2970)$, which cannot be implemented by conventional non-relativistic quark models, are explained by reasonable values of the axial charges. In addition, we apply the chiral model to bottom baryons and predict decay widths of the undiscovered Roper-like ${\Xi }_b$. We expect that our present investigation leads to elucidation of dynamical properties of the excited heavy baryons from the viewpoint of chiral symmetry.

arXiv comment12 pages, 7 figures, and 4 tables

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• Axial anomaly effect on three-quark and five-quark singly heavy baryons
• Fate of ${\Sigma }_c$, ${\Xi }_c^{\prime }$ and ${\Omega }_c$ baryons at high temperature with chiral restoration
• Chiral effective theory of scalar and vector diquarks revisited
• Understanding the 1P- and 2S-wave nucleon resonances within the extended Lee-Friedrichs Model