2017/08/07 by Kento Kumakawa, Daisuke Jido · 15 citations
Physics and Astronomy · #Baryon #Charmed baryons #Diquark #Excitation #High-Energy Particle Collisions Research #Hyperon #Isospin #Lambda #Lambda baryon #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Quark #Quark model #Quarkonium #Scalar (mathematics) #hep-ph #nucl-th
paper · pdf · open access · doi:10.1093/ptep/ptx155
published in Progress of Theoretical and Experimental Physics 2017(12) (University of Oxford) · 17 pages, 8 figures
arxiv created 2017/08/07 · openalex publication_date 2017/10/24 · arxiv updated 2017/12/18 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The excitation energies of the |Λc| and |Λb| baryons are investigated in a finite-size diquark potential model, in which the heavy baryons are treated as bound states of a charm quark and a scalar–isoscalar diquark. The diquark is considered as a sizable object. The quark–diquark interaction is calculated as a sum of the quark–quark interaction that is assumed to be half of the quark–antiquark interaction for the color singlet. The potential parameters in the quark–antiquark interaction are fixed so as to reproduce the charmonium spectrum. We find the diquark size to be 1.1 fm for the diquark mass 0.5 GeV/|c2| to reproduce the |1p| excitation energy of |Λc|. In this model, the |Λc| and |Λb| excitation spectra are reproduced well, while this model does not explain |Λc(2765)|, whose isospin and spin–parity are still unknown. Thus, the detailed properties of |Λc(2765)| are very important to the presence of the diquark in heavy baryons as an effective constituent. We also discuss the |Ξc| spectrum with the scalar strange diquark.