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Multipole structure of the nucleon tensor form factors

High Energy Physics - Phenomenology 2026-05-26 v1 High Energy Physics - Experiment High Energy Physics - Lattice

Abstract

We investigate the multipole structure of the nucleon tensor form factors within the chiral quark-soliton model based on the 1/Nc1/N_c expansion. Extending the previous leading-order analysis~\cite{Ghim:2025gqo}, we include the rotational 1/Nc1/N_c corrections. These corrections provide the leading nonvanishing contributions to the flavor components that are absent at leading order, thereby completing the flavor decomposition of the tensor multipole form factors at the present order. We numerically evaluate the isoscalar tensor charge, the isovector anomalous tensor magnetic moment, and the isoscalar tensor quadrupole moment, obtaining gTu+d=0.81g_T^{u+d}=0.81, κTud=1.97\kappa_T^{u-d}=1.97, and ETu+d(0)=5.98E_T^{u+d}(0)=5.98, respectively. The isoscalar tensor charge and quadrupole moment are mainly governed by the valence-quark contribution, whereas the isovector anomalous tensor magnetic moment receives a sizable Dirac-sea contribution. We also examine the momentum-transfer dependence of the corresponding form factors. They decrease monotonically with increasing t-t. In particular, the isovector anomalous tensor magnetic form factor shows a pronounced falloff in the small-t|t| region, reflecting the importance of the Dirac sea in the tensor dipole structure.

Keywords

Cite

@article{arxiv.2605.24435,
  title  = {Multipole structure of the nucleon tensor form factors},
  author = {Nam-Yong Ghim and Ho-Yeon Won and June-Young Kim and Hyun-Chul Kim},
  journal= {arXiv preprint arXiv:2605.24435},
  year   = {2026}
}

Comments

10 pages, 1 figure

R2 v1 2026-07-22T07:29:49.165Z