Strangeness in the proton from W+charm production and SIDIS data
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arXiv
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| Auteurs principaux: | , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866912650295771136 |
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| author | Anderson, Trey Melnitchouk, W. Sato, N. |
| author_facet | Anderson, Trey Melnitchouk, W. Sato, N. |
| contents | We perform a global QCD analysis of unpolarized parton distribution functions (PDFs) in the proton, including new $W +$\,charm production data from $pp$ collisions at the LHC and semi-inclusive pion and kaon production data in lepton-nucleon deep-inelastic scattering, both of which have been suggested for constraining the strange quark PDF. Compared with a baseline global fit that does not include these datasets, the new analysis reduces the uncertainty on the strange quark distribution over the range $0.01 < x < 0.3$, and provides a consistent description of processes sensitive to strangeness in the proton. Including the new datasets, the ratio of strange to nonstrange sea quark distributions is $R_s = (s+\bar s)/(\bar u+\bar d) = \{0.72^{+0.52}_{-0.34},\, 0.46^{+0.30}_{-0.20},\, 0.32^{+0.23}_{-0.15}\}$ for $x = \{ 0.01, 0.04, 0.1 \}$ at $Q^2 = 4$~GeV$^2$. The data place more stringent constraints on the strange asymmetry $s-\bar s$, which is found to be consistent with zero in this range. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_00665 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Strangeness in the proton from W+charm production and SIDIS data Anderson, Trey Melnitchouk, W. Sato, N. High Energy Physics - Phenomenology High Energy Physics - Experiment Nuclear Theory We perform a global QCD analysis of unpolarized parton distribution functions (PDFs) in the proton, including new $W +$\,charm production data from $pp$ collisions at the LHC and semi-inclusive pion and kaon production data in lepton-nucleon deep-inelastic scattering, both of which have been suggested for constraining the strange quark PDF. Compared with a baseline global fit that does not include these datasets, the new analysis reduces the uncertainty on the strange quark distribution over the range $0.01 < x < 0.3$, and provides a consistent description of processes sensitive to strangeness in the proton. Including the new datasets, the ratio of strange to nonstrange sea quark distributions is $R_s = (s+\bar s)/(\bar u+\bar d) = \{0.72^{+0.52}_{-0.34},\, 0.46^{+0.30}_{-0.20},\, 0.32^{+0.23}_{-0.15}\}$ for $x = \{ 0.01, 0.04, 0.1 \}$ at $Q^2 = 4$~GeV$^2$. The data place more stringent constraints on the strange asymmetry $s-\bar s$, which is found to be consistent with zero in this range. |
| title | Strangeness in the proton from W+charm production and SIDIS data |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment Nuclear Theory |
| url | https://arxiv.org/abs/2501.00665 |