{
  "abstract": "The flavor-nonsinglet ( u − d ) quark angular momentum (AM) in the proton is computed based on the effective spin-flavor dynamics emerging from chiral symmetry breaking by QCD instantons. The QCD AM operators are converted to effective spin-flavor operators expressing instanton-induced chiral interactions. A large negative orbital AM L u − d arises from the interactions of the quarks with the chiral mean field in the proton in the large- N c limit. It cancels part of the large positive spin AM S u − d and reduces the total AM J u − d = L u − d + S u − d , in agreement with lattice QCD calculations.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": null,
  "author_total": 3,
  "authors": [
    {
      "name": "June-Young Kim"
    },
    {
      "name": "Ho-Yeon Won"
    },
    {
      "name": "Christian Weiss"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/02h8gfszqqg13.bib",
  "cited_by": 0,
  "doi": "10.1016/j.physletb.2026.140980",
  "fulltext_url": null,
  "id": "02h8gfszqqg13",
  "issns": [
    "0370-2693",
    "1873-2445"
  ],
  "landing_url": "https://hal.science/hal-05767307v1",
  "language": "en",
  "licence": "CC-BY",
  "licence_label": "CC BY",
  "licence_source": "journal",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "hal",
      "0.phys"
    ],
    [
      "hal",
      "1.phys.hphe"
    ],
    [
      "openalex",
      "3106|Quantum Chromodynamics and Particle Interactions"
    ]
  ],
  "openalex": "W7214012188",
  "pdf_url": "https://www.sciencedirect.com/science/article/pii/S0370269326008300/pdf",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-28",
  "publisher": "Elsevier",
  "ris": "https://research.draconitic.com/paper/02h8gfszqqg13.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:42Z",
      "native_id": "hal-05767307",
      "source": "hal",
      "url": "https://hal.science/hal-05767307v1"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "hal:1.phys.hphe",
      "subfield": "high-energy"
    }
  ],
  "title": "Quark orbital angular momentum from chiral symmetry breaking in QCD",
  "title_text": "Quark orbital angular momentum from chiral symmetry breaking in QCD",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:17:42Z",
  "url": "https://research.draconitic.com/paper/02h8gfszqqg13",
  "venue": "Physics Letters B",
  "versions": []
}