{
  "abstract": "We compute the leading-twist proton parton distribution amplitude (PDA) using algebraic representations of the nucleon Faddeev wave function inspired by perturbation-theory integral representations. The PDA is obtained from a light-front projection of the covariant quark--diquark Faddeev amplitude and analysed in terms of its scalar- and axial-vector-diquark components. We derive analytic expressions for the corresponding diquark distribution amplitudes and their contributions to the proton PDA. The resulting distribution is broad and concave, with its maximum $(x_1,x_2,x_3)\\approx(0.55,0.20,0.25)$ displaced from the symmetric configuration $(1/3,1/3,1/3)$, which corresponds to the maximum of the perturbative-QCD asymptotic form. Scalar-diquark correlations generate a strong asymmetry in the longitudinal momentum distribution, whereas axial-vector correlations redistribute momentum among the valence quarks and significantly reduce this asymmetry. We calculate low-order Mellin moments and obtain a compact parametrisation of the proton PDA at the hadronic scale, $μ_0=0.51\\,\\mathrm{GeV}$. We then perform the leading-order QCD evolution of its normalized shape to $μ=2\\,\\mathrm{GeV}$, finding that evolution reduces the momentum asymmetry while preserving a clear imprint of the non-perturbative quark--diquark correlations. The results provide insight into the role of such correlations in shaping the proton light-front structure and furnish non-perturbative input for studies of hard exclusive baryonic processes.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.22994",
  "author_total": 4,
  "authors": [
    {
      "name": "B. Almeida-Zamora"
    },
    {
      "name": "L. Albino"
    },
    {
      "name": "C. Mezrag"
    },
    {
      "name": "J. Segovia"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/fcjp6yrmbr95z.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.22994",
  "fulltext_url": null,
  "id": "fcjp6yrmbr95z",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.22994",
  "language": "en",
  "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-lat"
    ],
    [
      "arxiv",
      "hep-ph"
    ],
    [
      "arxiv",
      "nucl-ex"
    ],
    [
      "arxiv",
      "nucl-th"
    ],
    [
      "hal",
      "0.phys"
    ],
    [
      "hal",
      "1.phys.hexp"
    ],
    [
      "hal",
      "1.phys.hlat"
    ],
    [
      "hal",
      "1.phys.hphe"
    ],
    [
      "hal",
      "1.phys.nexp"
    ],
    [
      "hal",
      "1.phys.nucl"
    ],
    [
      "openalex",
      "3106|Quantum Chromodynamics and Particle Interactions"
    ]
  ],
  "openalex": "W7222930073",
  "pdf_url": "https://arxiv.org/pdf/2610.22994",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-16",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/fcjp6yrmbr95z.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:30:32Z",
      "native_id": "2610.22994",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.22994"
    },
    {
      "first_seen": "2026-11-04T12:20:52Z",
      "native_id": "hal-05850255",
      "source": "hal",
      "url": "https://hal.science/hal-05850255v1"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ex",
      "subfield": "high-energy"
    },
    {
      "field": "physics",
      "origin": "arxiv:nucl-ex",
      "subfield": "nuclear"
    }
  ],
  "title": "Leading-twist proton parton distribution amplitude from scalar and axial-vector diquark correlations",
  "title_text": "Leading-twist proton parton distribution amplitude from scalar and axial-vector diquark correlations",
  "type": "preprint",
  "updated_at": "2026-11-05T12:20:12Z",
  "url": "https://research.draconitic.com/paper/fcjp6yrmbr95z",
  "venue": "arXiv",
  "versions": []
}