Isospin dependence of nuclear EMC effect from global QCD analysis
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arXiv
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| Auteurs principaux: | , , , , |
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| Format: | Preprint |
| Publié: |
2026
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| _version_ | 1866911458551398400 |
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| author | Cocuzza, C. Hague, T. J. Melnitchouk, W. Sato, N. Thomas, A. W. |
| author_facet | Cocuzza, C. Hague, T. J. Melnitchouk, W. Sato, N. Thomas, A. W. |
| contents | We perform a new global QCD analysis of unpolarized parton distribution functions (PDFs) in the nucleon from proton, deuteron and $A=3$ data, including recent measurements of $^3$He/$D$ and $^3$H/$D$ cross section ratios from the MARATHON experiment at Jefferson Lab. Simultaneously inferring the PDFs and nucleon off-shell corrections allows both to be determined consistently, without theoretical assumptions about the isospin dependence of nuclear effects. The analysis provides strong evidence for the need of nucleon off-shell corrections to describe the $A=3$ data, and suggests the presence of both isoscalar and isovector nuclear effects in $A \leq 3$ nuclei. We find that the extracted EMC ratios of nuclear to nucleon structure functions for $A=2$ and 3 differ from those naively extrapolated from heavy nuclei down to low $A$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_16589 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Isospin dependence of nuclear EMC effect from global QCD analysis Cocuzza, C. Hague, T. J. Melnitchouk, W. Sato, N. Thomas, A. W. High Energy Physics - Phenomenology High Energy Physics - Experiment Nuclear Theory We perform a new global QCD analysis of unpolarized parton distribution functions (PDFs) in the nucleon from proton, deuteron and $A=3$ data, including recent measurements of $^3$He/$D$ and $^3$H/$D$ cross section ratios from the MARATHON experiment at Jefferson Lab. Simultaneously inferring the PDFs and nucleon off-shell corrections allows both to be determined consistently, without theoretical assumptions about the isospin dependence of nuclear effects. The analysis provides strong evidence for the need of nucleon off-shell corrections to describe the $A=3$ data, and suggests the presence of both isoscalar and isovector nuclear effects in $A \leq 3$ nuclei. We find that the extracted EMC ratios of nuclear to nucleon structure functions for $A=2$ and 3 differ from those naively extrapolated from heavy nuclei down to low $A$. |
| title | Isospin dependence of nuclear EMC effect from global QCD analysis |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment Nuclear Theory |
| url | https://arxiv.org/abs/2602.16589 |