Valence-quark-core and meson-cloud effects on electromagnetic form factors of Δ baryons
Abstract
Electromagnetic form factors and electromagnetic properties of Δ baryons are studied in the perturbative chiral quark model (PCQM) using quark wavefunctions predetermined from proton charge form factor data. Our predictions agree reasonably with lattice-QCD and other phenomenological results. For charged Δ++, Δ+, and Δ−, observables are dominated by the three-quark core, with small meson-cloud corrections superimposed. For neutral Δ0, the leading-order quark core contribution vanishes, so meson-cloud corrections fully determine its electromagnetic response. The PCQM gives a nonzero magnetic moment, a negative charge radius, and a sizable magnetic radius for Δ0. This work provides consistent, parameter-free predictions for Δ baryon structure and highlights the role of meson cloud fluctuations.
Related
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BibTeX
@misc{fan2026valencequarkcore,
title = {{Valence-quark-core and meson-cloud effects on electromagnetic form factors of $Δ$ baryons}},
author = {Yutao Fan and Shuai Gui and Shixing Liu and Yongxin Guo and Xuyang Liu},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.35705},
eprint = {2610.35705},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.35705},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Valence-quark-core and meson-cloud effects on electromagnetic form factors of Δ baryons
AU - Yutao Fan
AU - Shuai Gui
AU - Shixing Liu
AU - Yongxin Guo
AU - Xuyang Liu
PY - 2026
DA - 2026/10/26
PB - arXiv
DO - 10.48550/arxiv.2610.35705
UR - https://arxiv.org/abs/2610.35705
AB - Electromagnetic form factors and electromagnetic properties of Δ baryons are studied in the perturbative chiral quark model (PCQM) using quark wavefunctions predetermined from proton charge form factor data. Our predictions agree reasonably with lattice-QCD and other phenomenological results. For charged Δ^++, Δ^+, and Δ^−, observables are dominated by the three-quark core, with small meson-cloud corrections superimposed. For neutral Δ^0, the leading-order quark core contribution vanishes, so meson-cloud corrections fully determine its electromagnetic response. The PCQM gives a nonzero magnetic moment, a negative charge radius, and a sizable magnetic radius for Δ^0. This work provides consistent, parameter-free predictions for Δ baryon structure and highlights the role of meson cloud fluctuations.
ER -