{
  "abstract": "We revisit the extraction of parton distribution functions (PDFs) in the pion in a global QCD analysis of pion--nucleus Drell--Yan and leading-neutron (LN) electroproduction data, in view of recent suggestions that uncertainties on the pion PDFs at small parton momentum fraction $x$ are dramatically underestimated. We perform a set of controlled fits that vary the LN data coverage, PDF parametrization, and positivity constraints, determining both the PDFs and pion-nucleon splitting functions simultaneously. While the use of a restricted H1 LN data sample used by the Fantômas group is found to enlarge the PDF uncertainties and admit solutions with vanishing gluon PDFs, our global analysis provides a good description of an extended H1 and ZEUS LN database, significantly reducing the parametrization dependence and strongly disfavoring a zero gluon distribution.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.19415",
  "author_total": 4,
  "authors": [
    {
      "name": "C. Yang"
    },
    {
      "name": "P. C. Barry"
    },
    {
      "name": "W. Melnitchouk"
    },
    {
      "name": "N. Sato"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/ehb77svx3rb0g.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.19415",
  "fulltext_url": null,
  "id": "ehb77svx3rb0g",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.19415",
  "language": null,
  "licence": "LicenseRef-arXiv-nonexclusive-1.0",
  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "hep-ex"
    ],
    [
      "arxiv",
      "hep-ph"
    ],
    [
      "arxiv",
      "nucl-th"
    ],
    [
      "openalex",
      "3106|Quantum Chromodynamics and Particle Interactions"
    ]
  ],
  "openalex": "W7222084296",
  "pdf_url": "https://arxiv.org/pdf/2610.19415",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-14",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/ehb77svx3rb0g.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:29:31Z",
      "native_id": "2610.19415",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.19415"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ex",
      "subfield": "high-energy"
    },
    {
      "field": "physics",
      "origin": "arxiv:nucl-th",
      "subfield": "nuclear"
    }
  ],
  "title": "Constraints on pion parton distributions at small $x$ from leading-neutron electroproduction data",
  "title_text": "Constraints on pion parton distributions at small x from leading-neutron electroproduction data",
  "type": "preprint",
  "updated_at": "2026-10-30T12:29:31Z",
  "url": "https://research.draconitic.com/paper/ehb77svx3rb0g",
  "venue": "arXiv",
  "versions": []
}