{
  "annotation_id": "4529fe2c-064a-4c28-b2b0-6524a7971ff6",
  "date_created": "2026-03-02T18:00:18.788000Z",
  "date_modified": "2026-03-02T18:00:18.788000Z",
  "file_hash": "05eb0135032de67de7718c4aabbefc0697d5666b5fc1e96635ea524b8eaa07ef",
  "private": false,
  "record": {
    "abstract": "We discuss the two-pion exchange potential which emerges from a box diagram\nwith one nucleon (the spectator) restricted to its mass shell, and the other\nnucleon line replaced by a subtracted, covariant $\\pi N$ scattering amplitude\nwhich includes $\\Delta$, Roper, and $D_{13}$ isobars, as well as contact terms\nand off-shell (non-pole) dressed nucleon terms. The $\\pi N$ amplitude satisfies\nchiral symmetry constraints and fits $\\pi N$ data below $\\sim$ 700 MeV pion\nenergy. We find that this TPE potential can be well approximated by the\nexchange of an effective sigma and delta meson, with parameters close to the\nones used in one-boson-exchange models that fit $NN$ data below the pion\nproduction threshold.",
    "arxiv_id": "nucl-th/9605041",
    "authors": [
      "M. T. Pe\u00f1a",
      "Franz Gross",
      "Yohanes Surya"
    ],
    "categories": [
      "nucl-th"
    ],
    "doi": "10.1103/PhysRevC.54.2235",
    "journal_ref": "Phys.Rev.C54:2235-2239,1996",
    "title": "Two-pion exchange potential and the $\\pi N$ amplitude",
    "url": "https://arxiv.org/abs/nucl-th/9605041"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "0845ff97-f847-4973-b25d-365f110469c5",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}