Abstract
We investigate the electromagnetic transitions of the singly charmed baryons with spin 3/2, based on a pion mean-field approach, also known as the chiral quark-soliton model, taking into account the rotational $1/N_c$ corrections and the effects of flavor SU(3) symmetry breaking. We examine the valence- and sea-quark contributions to the electromagnetic transition form factors and find that the quadrupole form factors of the sea-quark contributions dominate over those of the valence-quark ones in the smaller $Q^2$ region, whereas the sea quarks only provide marginal contributions to the magnetic dipole transition form factors of the baryon sextet with spin 3/2. The effects of the flavor SU(3) symmetry breaking are in general very small except for the forbidden transition $\Xi_c^0\gamma\to \Xi_c^{*0}$ by $U$-spin symmetry. We also discuss the widths of the radiative decays for the baryon sextet with spin 3/2, comparing the present results with those from other works.
Highlights
It is of great importance to understand the electromagnetic (EM) structure of a baryon, since it reveals how the baryon is shaped by its constituents
We examine the valence- and seaquark contributions to the electromagnetic transition form factors and find that the quadrupole form factors of the sea-quark contributions dominate over those of the valence-quark ones in the smaller Q2 region, whereas the sea quarks only provide marginal contributions to the magnetic dipole transition form factors of the baryon sextet with spin 3=2
This leads to an interpretation that the E2 moment of a low-lying baryon with spin 3=2 is governed by long-distance pion clouds [3]
Summary
It is of great importance to understand the electromagnetic (EM) structure of a baryon, since it reveals how the baryon is shaped by its constituents. We investigate the EM transition form factors of the low-lying singly heavy baryons with spin 3=2 within the framework of the chiral quark-soliton model (χQSM). This indicates that the light quarks govern the dynamics inside a singly heavy baryon Based on this heavy-quark spin-flavor symmetry, the pion mean-field approach was developed for the singly heavy baryons that can be regarded as the bound state of Nc − 1 valence quarks. While the Ω0cγ → ΩÃc0 radiative decay was computed in lattice QCD, there is no work on the EM transition form factors for all possible radiative decays for the baryon sextet with spin 3=2.
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