Twist-3 generalized parton distributions of sea quarks at zero skewness in the light-cone quark model
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| Format: | Preprint |
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2025
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| _version_ | 1866909584230187008 |
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| author | Luan, Xiaoyan Lu, Zhun |
| author_facet | Luan, Xiaoyan Lu, Zhun |
| contents | We present a systematic study of twist-3 generalized parton distributions (GPDs) for $\bar{u}$ and $\bar{d}$ 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 $|q\bar{q}B\rangle$ 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 ($H_2$, $E_2$, $\widetilde{E}_2$, $\widetilde{H}_2^\prime$) and chiral-even ($\widetilde{E}_{2T}$, $H_{2T}^\prime$, $E_{2T}^\prime$, $\widetilde{H}_{2T}^\prime$) distributions for $\bar{u}$ and $\bar{d}$ quarks at zero skewness. By taking the forward limit, we also calculate the corresponding twist-3 parton distribution functions $e(x)$ of $\bar{u}$ and $\bar{d}$ 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. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2504_13627 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Twist-3 generalized parton distributions of sea quarks at zero skewness in the light-cone quark model Luan, Xiaoyan Lu, Zhun High Energy Physics - Phenomenology We present a systematic study of twist-3 generalized parton distributions (GPDs) for $\bar{u}$ and $\bar{d}$ 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 $|q\bar{q}B\rangle$ 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 ($H_2$, $E_2$, $\widetilde{E}_2$, $\widetilde{H}_2^\prime$) and chiral-even ($\widetilde{E}_{2T}$, $H_{2T}^\prime$, $E_{2T}^\prime$, $\widetilde{H}_{2T}^\prime$) distributions for $\bar{u}$ and $\bar{d}$ quarks at zero skewness. By taking the forward limit, we also calculate the corresponding twist-3 parton distribution functions $e(x)$ of $\bar{u}$ and $\bar{d}$ 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. |
| title | Twist-3 generalized parton distributions of sea quarks at zero skewness in the light-cone quark model |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2504.13627 |