Tomography of high-twist proton structure through $ep$ elastic scattering
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866909942728884224 |
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| author | Yu, Ji-Xin Cheng, Shan Han, Jia-Jie Li, Hsiang-nan Yu, Fu-Sheng |
| author_facet | Yu, Ji-Xin Cheng, Shan Han, Jia-Jie Li, Hsiang-nan Yu, Fu-Sheng |
| contents | We present the first high-twist study of the proton form factors $F_{1,2}(Q^2)$ in $ep$ elastic scattering based on the perturbative QCD $k_T$ factorization, $Q^2$ being momentum transfer squared. It is motivated by unexpectedly large higher-power contributions from subleading-twist light-cone distribution amplitudes (LCDAs), which are attributed to the enhancement in endpoint regions of parton momentum fractions. We highlight that the endpoint enhancement, tamed by the $k_T$ resummation effect, is crucial for accommodating the approximate scaling behavior of the $Q^4F_1(Q^2)$ data at intermediate $Q^2\sim {\cal O}(10)$ GeV$^2$. The proton LCDAs up to twist 6 are then extracted, and verified by the charge-parity asymmetries observed in hadronic heavy baryon decays. Our work provides new insights into the proton three-dimensional structure and manifests the precision requirement for reliable perturbative analyses of baryonic exclusive processes. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2511_12589 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Tomography of high-twist proton structure through $ep$ elastic scattering Yu, Ji-Xin Cheng, Shan Han, Jia-Jie Li, Hsiang-nan Yu, Fu-Sheng High Energy Physics - Phenomenology High Energy Physics - Experiment We present the first high-twist study of the proton form factors $F_{1,2}(Q^2)$ in $ep$ elastic scattering based on the perturbative QCD $k_T$ factorization, $Q^2$ being momentum transfer squared. It is motivated by unexpectedly large higher-power contributions from subleading-twist light-cone distribution amplitudes (LCDAs), which are attributed to the enhancement in endpoint regions of parton momentum fractions. We highlight that the endpoint enhancement, tamed by the $k_T$ resummation effect, is crucial for accommodating the approximate scaling behavior of the $Q^4F_1(Q^2)$ data at intermediate $Q^2\sim {\cal O}(10)$ GeV$^2$. The proton LCDAs up to twist 6 are then extracted, and verified by the charge-parity asymmetries observed in hadronic heavy baryon decays. Our work provides new insights into the proton three-dimensional structure and manifests the precision requirement for reliable perturbative analyses of baryonic exclusive processes. |
| title | Tomography of high-twist proton structure through $ep$ elastic scattering |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2511.12589 |