Electromagnetic form factors of singly heavy baryons in the self-consistent SU(3) chiral quark-soliton model

Kim, June-Young (Department of Physics, Inha University, Incheon 22212, Republic of Korea) ; Kim, Hyun-Chul (Department of Physics, Inha University, Incheon 22212, Republic of Korea) (School of Physics, Korea Institute for Advanced Study (KIAS), Seoul 02455, Republic of Korea)

08 June 2018

Abstract: The self-consistent chiral quark-soliton model is a relativistic pion mean-field approach in the large Nc limit, which describes both light and heavy baryons on an equal footing. In the limit of the infinitely heavy mass of the heavy quark, a heavy baryon can be regarded as Nc1 valence quarks bound by the pion mean fields, leaving the heavy quark as a color static source. The structure of the heavy baryon in this scheme is mainly governed by the light-quark degrees of freedom. Based on this framework, we evaluate the electromagnetic form factors of the lowest-lying heavy baryons. The rotational 1/Nc and strange current quark mass corrections in linear order are considered. We discuss the electric charge and magnetic densities of heavy baryons in comparison with those of the nucleons. The results of the electric charge radii of the positive-charged heavy baryons show explicitly that the heavy baryon is a compact object. The electric form factors are presented. The form factor of Σc++ is compared with that from a lattice QCD. We also discuss the results of the magnetic form factors. The magnetic moments of the baryon sextet with spin 1/2 and the magnetic radii are compared with other works and the lattice data.

Published in: Physical Review D 97 (2018)
Published by: APS
DOI: 10.1103/PhysRevD.97.114009
arXiv: 1803.04069
License: CC-BY-4.0

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