{
  "annotation_id": "5de3d9b9-68af-444c-84f9-09ba4f0a0d8c",
  "date_created": "2026-03-02T18:00:19.117000Z",
  "date_modified": "2026-03-02T18:00:19.117000Z",
  "file_hash": "fcfb442ea81edfb126f8744b9c82b14384838d519c12129aadfcc2930809a744",
  "private": false,
  "record": {
    "abstract": "The coupled eta N, pi N system is described by a K-matrix method. The\nparameters in this model are adjusted to get an optimal fit to pi N -\u003e pi N, pi\nN -\u003e eta N and gamma N -\u003e eta N data in an energy range of about 100MeV each\nside of the eta threshold. In the notation T^(-1)+iq_(eta) = 1/a + (r_0)/2\nq^2_(eta) + s q^4_(eta), q_(eta) being the momentum in the eta N\ncenter-of-mass, the resulting effective range parameters for eta N scattering\nare found to be a(fm) = 0.75(4)-i0.27(3), r_0(fm) = -1.50(13)-i0.24(4) and\ns(fm^3) = -0.10(2)-i0.01(1)",
    "arxiv_id": "nucl-th/9703009",
    "authors": [
      "A. M. Green",
      "S. Wycech"
    ],
    "categories": [
      "nucl-th",
      "hep-ph"
    ],
    "doi": "10.1103/PhysRevC.55.R2167",
    "journal_ref": "Phys.Rev.C55:2167-2170,1997",
    "title": "The Eta-Nucleon Scattering Length and Effective Range",
    "url": "https://arxiv.org/abs/nucl-th/9703009"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "565e495c-735f-4b2e-8996-4156341da283",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}