Novel pentaquark picture for singly heavy baryons from chiral symmetry

We propose a new type of structure for singly heavy baryons of Qqqqq in addition to the conventional one of Qqq. Based on chiral symmetry of the light quarks, we show that the Qqqqq baryon offers a novel picture for heavy-quark spin-singlet and flavor-antisymmetric baryons. By making use of the effe...

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Bibliographic Details
Published in:Physical review. D 2021-08, Vol.104 (3), p.1, Article 034009
Main Authors: Suenaga, Daiki, Hosaka, Atsushi
Format: Article
Language:English
Subjects:
Baryons
Flavor (particle physics)
Parity
Quark models
Quarks
Sum rules
Symmetry
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Summary:We propose a new type of structure for singly heavy baryons of Qqqqq in addition to the conventional one of Qqq. Based on chiral symmetry of the light quarks, we show that the Qqqqq baryon offers a novel picture for heavy-quark spin-singlet and flavor-antisymmetric baryons. By making use of the effective Lagrangian approach, we find that Λc(2765) and Ξc(2967) are mostly Qqqqq, while Λc(2286) and Ξc(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.
ISSN:2470-0010
2470-0029
DOI:10.1103/PhysRevD.104.034009