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Twist-3 generalized parton distributions of sea quarks at zero skewness in the light-cone quark model

Xiaoyan Luan and Zhun Lu*

  • *Contact author: zhunlu@seu.edu.cn

Phys. Rev. D 112, 034004 – Published 5 August, 2025

DOI: https://doi.org/10.1103/34lm-pr91

Abstract

We present a systematic study of twist-3 generalized parton distributions (GPDs) for u¯ and d¯ sea quarks in the proton at zero skewness (ξ=0) using the light-cone formalism with overlap representation. The proton wave functions are derived from a meson-baryon fluctuation model that incorporates |qq¯B⟩ Fock states, providing a natural framework for investigating sea quark contributions. Within this approach, we compute the complete set of twist-3 GPDs and present the numerical results, including both chiral-odd (H2, E2, E˜2, and H˜2′) and chiral-even (E˜2T, H2T′, E2T′, and H˜2T′) distributions for u¯ and d¯ quarks at zero skewness. By taking the forward limit, we also calculate the corresponding twist-3 parton distribution functions e(x) of u¯ and d¯ quarks. The kinetic orbital angular momenta of sea quarks deduced from the twist-3 GPDs are studied and compared to those from the twist-2 GPDs.

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