{
  "annotation_id": "33337414-1586-40fe-8a1e-8c098295fc18",
  "date_created": "2026-03-02T18:00:22.141000Z",
  "date_modified": "2026-03-02T18:00:22.141000Z",
  "file_hash": "9a26ee32966a90637e1ceb1ed87832391c2fe7dca52d11124c4b49754bd33ff7",
  "private": false,
  "record": {
    "abstract": "In this work improvements to the application of the Gross equation to nuclear\nsystems are tested. In particular we evaluate the two pion exchange diagrams,\nincluding the crossed-box diagram, using models developed within the\nspectator-on-mass-shell covariant formalism. We found that the form factors\nused in these models induce spurious contributions that violate the unitary cut\nrequirement. We tested then some alternative form-factors in order to preserve\nthe unitarity condition. With this new choice, the difference between the exact\nand the spectator-on-mass-shell amplitudes is of the order of the one boson\nscalar exchange, supporting the idea that this difference may be parameterized\nby this type of terms.",
    "arxiv_id": "nucl-th/9808060",
    "authors": [
      "G. Ramalho",
      "A. Arriaga",
      "M. T. Pe\u00f1a"
    ],
    "categories": [
      "nucl-th"
    ],
    "doi": "10.1103/PhysRevC.60.047001",
    "journal_ref": "Phys.Rev. C60 (1999) 047001",
    "title": "Two-pion exchange and strong form-factors in covariant field theories",
    "url": "https://arxiv.org/abs/nucl-th/9808060"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "614ffe70-a7b0-44e4-b2fa-9cb783765d70",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}