{
  "annotation_id": "45841f1e-4ca1-4613-b2b1-97e319a2cdd4",
  "date_created": "2026-03-02T18:00:11.936000Z",
  "date_modified": "2026-03-02T18:00:11.936000Z",
  "file_hash": "6b8f4bacb4b64a9bdde884b358555a10f00d19bd163a782450d13b310a4cc508",
  "private": false,
  "record": {
    "abstract": "In order to isolate the contribution of the nucleon strange electric form\nfactor to the parity-violating asymmetry measured in 4He(\\vec e,e\u0027)4He\nexperiments, it is crucial to have a reliable estimate of the magnitude of\nisospin-symmetry-breaking (ISB) corrections in both the nucleon and 4He. We\nexamine this issue in the present letter. Isospin admixtures in the nucleon are\ndetermined in chiral perturbation theory, while those in 4He are derived from\nnuclear interactions, including explicit ISB terms. A careful analysis of the\nmodel dependence in the resulting predictions for the nucleon and nuclear ISB\ncontributions to the asymmetry is carried out. We conclude that, at the low\nmomentum transfers of interest in recent measurements reported by the HAPPEX\ncollaboration at Jefferson Lab, these contributions are of comparable magnitude\nto those associated with strangeness components in the nucleon electric form\nfactor.",
    "arxiv_id": "nucl-th/0703051",
    "authors": [
      "M. Viviani",
      "R. Schiavilla",
      "B. Kubis",
      "R. Lewis",
      "L. Girlanda",
      "A. Kievsky",
      "L. E. Marcucci",
      "S. Rosati"
    ],
    "categories": [
      "nucl-th",
      "nucl-ex"
    ],
    "doi": "10.1103/PhysRevLett.99.072001",
    "journal_ref": "Phys.Rev.Lett.99:112002,2007",
    "title": "Isospin mixing in the nucleon and 4He and the nucleon strange electric   form factor",
    "url": "https://arxiv.org/abs/nucl-th/0703051"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "6a005832-5f56-4dfe-bc74-87dd28d66dbd",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}