Novel pentaquark picture for singly heavy baryons from chiral symmetry

Abstract

We propose a new type of structure for singly heavy baryons of $Qqq\bar{q}q$ in addition to the conventional one of $Qqq$. Based on chiral symmetry of the light quarks, we show that the $Qqq\bar{q}q$ baryon offers a novel picture for heavy quark spin-singlet and flavor-antisymmetric baryons. By making use of the effective Lagrangian approach, we find ${\Lambda }_c(2765)$ and ${\Xi }_c(2967)$ are mostly $Qqq\bar{q}q$ while ${\Lambda }_c(2286)$ and ${\Xi }_c(2470)$ are mostly $Qqq$. The masses of negative-parity baryons are predicted. We also derive a sum rule and the extended Goldberger-Treiman relation that the masses of the baryons satisfy. Furthermore, a mass degeneracy of parity partners of the baryons with the restoration of chiral symmetry is discussed. These are the unique features that the conventional picture of radial excitation in the quark model does not accommodate. Our findings provide useful information not only for future experiments but also for future lattice simulations on diquarks.

7 pages, 3 figures

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Cited by in corpus (11)

• Chiral perturbation theory for heavy hadrons and chiral effective field theory for heavy hadronic molecules
• Relativistic corrections to decays of heavy baryons in the quark model
• Heavy baryon spectrum with chiral multiplets of scalar and vector diquarks
• Probing the hadron mass spectrum in dense two-color QCD with the linear sigma model
• Decays of Roper-like singly heavy baryons in a chiral model
• Strong decays of singly heavy baryons from a chiral effective theory of diquarks
• Axial anomaly effect to the chiral-partner structure of diquarks at high temperature
• Masses and Magnetic Moments of Singly Heavy Pentaquarks
• 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