{
  "annotation_id": "aed22c75-5f62-4134-9424-b6c1390a9e7d",
  "date_created": "2026-03-02T17:59:57.933000Z",
  "date_modified": "2026-03-02T17:59:57.933000Z",
  "file_hash": "b4ac5b70222322ae4c5c2bddda049462c1252a4c218421f6eff2ef76e29e8fc5",
  "private": false,
  "record": {
    "abstract": "It is shown that most of the available data on the $pp\\to pp\\eta$ reaction,\nincluding the invariant mass distributions in the $pp\\to pp\\eta$ reaction\nrecently measured at COSY, can be understood in terms of the partial-wave\namplitudes involving final $pp$ $S$ and $P$ states and the $\\eta$ meson s-wave.\nThis finding, together with the fact that results within a meson--exchange\nmodel are especially sensitive to the details of the excitation mechanism of\nthe $S_{11}(1535)$ resonance, demonstrates the possibility of investigating the\nproperties of this resonance in $NN$ collisions. The spin correlation function\n$C_{xx}$ is shown to disentangle the $S$- and $P$-wave contributions. It is\nalso argued that spin correlations may be used to help constrain the\ncontributions of the amplitudes corresponding to the final $pp$ $^3P_0$",
    "arxiv_id": "nucl-th/0302061",
    "authors": [
      "K. Nakayama",
      "J. Haidenbauer",
      "C. Hanhart",
      "J. Speth"
    ],
    "categories": [
      "nucl-th"
    ],
    "doi": "10.1103/PhysRevC.68.045201",
    "journal_ref": "Phys.Rev. C68 (2003) 045201",
    "title": "An analysis of the reaction pp --\u003e pp\\eta near threshold",
    "url": "https://arxiv.org/abs/nucl-th/0302061"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "f899deb1-7e78-45c1-85a4-31a1704fa320",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}