{
  "annotation_id": "f6e0ca0b-df9d-48ba-b7b2-703282981570",
  "date_created": "2026-03-02T18:00:01.257000Z",
  "date_modified": "2026-03-02T18:00:01.257000Z",
  "file_hash": "7cf15e2786c998985d758106fc8bb3b7e37479c1f7676c50aad10fc0901cb1ec",
  "private": false,
  "record": {
    "abstract": "We analyze polarization phenomena for elastic lepton-nucleon scattering,\nparametrizing the $2\\gamma$-exchange contribution, as the product of lepton and\nnucleon axial vector currents, that correspond to $C=+1$ exchange in the\nannihilation channel. We found two combinations of polarization observables\n(one for three T-odd observables and another one - for five T-even\nobservables), which allow to measure the ratio $G_E(Q^2)/G_M(Q^2)$ of nucleon\nelectromagnetic form factors in model independent way, without any specific\nassumption about the $2\\gamma$-exchange mechanism. Both these combinations have\na general character and do not depend on the choice of the spin structure for\nthe $2\\gamma$-exchange. We show the inconsistency of other approximations\nrecently used in the literature.",
    "arxiv_id": "nucl-th/0402004",
    "authors": [
      "M. P. Rekalo",
      "E. Tomasi-Gustafsson"
    ],
    "categories": [
      "nucl-th"
    ],
    "doi": "10.1016/j.nuclphysa.2004.07.009",
    "journal_ref": "Nucl.Phys.A742:322-334,2004",
    "title": "Polarization phenomena in elastic $e^{\\mp}N$ scattering, for axial   parametrization of two-photon exchange",
    "url": "https://arxiv.org/abs/nucl-th/0402004"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "50f793f7-83ee-4bad-9700-043e7162af73",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}