Relative difference between up and down quark structure of the proton
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arXiv
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| Auteurs principaux: | , , , , , |
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866910964311392256 |
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| author | Xie, Mingzhe Yang, Siqi Ma, Wenhao Liu, Minghui Han, Liang Yuan, C. -P. |
| author_facet | Xie, Mingzhe Yang, Siqi Ma, Wenhao Liu, Minghui Han, Liang Yuan, C. -P. |
| contents | We presen a novel determination of the down-to-up composition ratio using the forward-backward asymmetry observed in the proton-proton collisions at the LHC. This method offers unique insights into the flavor-specific difference between down and up quarks, which are difficult to isolate in traditional cross-section measurements due to the inherent mixing of contributions from both flavors. In this study, we systematically measure the down-to-up quark ratio over a broad momentum fraction (x) range of 0.01 to 0.1, utilizing the sensitivity of the forward-backward asymmetry to quark-level couplings. Our findings reveal significant deviations in both the value and x-dependence of this ratio compared to predictions from current parton distribution functions (PDFs). These discrepancies highlight potential limitations in existing PDF parameterization and emphasize the importance of flavor-separated measurements for advancing our understanding of proton structure. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_17608 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Relative difference between up and down quark structure of the proton Xie, Mingzhe Yang, Siqi Ma, Wenhao Liu, Minghui Han, Liang Yuan, C. -P. High Energy Physics - Phenomenology We presen a novel determination of the down-to-up composition ratio using the forward-backward asymmetry observed in the proton-proton collisions at the LHC. This method offers unique insights into the flavor-specific difference between down and up quarks, which are difficult to isolate in traditional cross-section measurements due to the inherent mixing of contributions from both flavors. In this study, we systematically measure the down-to-up quark ratio over a broad momentum fraction (x) range of 0.01 to 0.1, utilizing the sensitivity of the forward-backward asymmetry to quark-level couplings. Our findings reveal significant deviations in both the value and x-dependence of this ratio compared to predictions from current parton distribution functions (PDFs). These discrepancies highlight potential limitations in existing PDF parameterization and emphasize the importance of flavor-separated measurements for advancing our understanding of proton structure. |
| title | Relative difference between up and down quark structure of the proton |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2505.17608 |