Heavy Baryons in a Pion Mean-Field Approach: A Brief Review

• Published in: Journal of the Korean Physical Society Vol. 73; no. 2; pp. 165 - 178
• Main Author: Kim, Hyun-Chul
• Format: Journal Article
• Language: English
• Published: Seoul The Korean Physical Society 01.07.2018; Springer Nature B.V; 한국물리학회
• Subjects: Baryons; JKPS 50th Anniversary Reviews; Magnetic moments; Mathematical and Computational Physics; Particle and Nuclear Physics; Physics; Physics and Astronomy; Quarks; Review Articles; Theoretical; 물리학; Pion mean fields; Heavy baryons; Flavor SU symmetry breaking; Chiral quark-soliton model
• ISSN: 0374-4884; 1976-8524
• DOI: 10.3938/jkps.73.165

We review in this paper a series of recent works on properties of singly heavy baryons, based on a pion mean-field approach. In the limit of an infinitely heavy-quark mass, the heavy quark inside a heavy baryon can be regarded as a static color source. In this limit, a heavy baryon can be viewed as N c − 1 valence quarks bound by the pion mean fields which are created self-consistently by the presence of the N c valence quarks. We show that this mean-field approach can successfully describe the masses and the magnetic moments of the lowest-lying singly heavy baryons, using all the parameters fixed in the light-baryon sector except for the hyperfine spin-spin interactions. We also review a recent work on identifying the newly found excited Ω c baryons reported by the LHCb Collaboration. We discuss possible scenarios to identify them. Finally, we give a future perspective on this pion mean-field approach.