{
  "annotation_id": "645ffb8d-7631-42cd-b3bf-109d0287f2ab",
  "date_created": "2026-03-02T18:00:07.975000Z",
  "date_modified": "2026-03-02T18:00:07.975000Z",
  "file_hash": "228c328c664b4648fe16fdce2d8d604cbf12b09473fc08488fba040d48b23d2f",
  "private": false,
  "record": {
    "abstract": "We study the production amplitude for the reaction $NN\\to NN\\pi$ up to\nnext-to-leading order in chiral perturbation theory. We show that the\nirreducible chiral loops at this order exactly cancel those terms that arise\nfrom the off-shell parts of the $\\pi N$ rescattering vertex. This cancellation\nis required for formal consistency of the whole scheme. The net effect of the\ninclusion of all next-to-leading order loops is to enhance the leading\nrescattering amplitude by a factor of 4/3 compared to phenomenological studies,\nbringing its contribution to the cross section for $pp\\to d\\pi^+$ close to the\nexperimental value.",
    "arxiv_id": "nucl-th/0609007",
    "authors": [
      "V. Lensky",
      "J. Haidenbauer",
      "C. Hanhart",
      "V. Baru",
      "A. Kudryavtsev",
      "U. -G. Mei\u00dfner"
    ],
    "categories": [
      "nucl-th"
    ],
    "doi": "10.1142/S0217751X07035902",
    "journal_ref": "Int.J.Mod.Phys.A22:591-595,2007",
    "title": "Advances in the field-theoretic understanding of pion production in   nucleon-nucleon collisions",
    "url": "https://arxiv.org/abs/nucl-th/0609007"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "de464936-3590-405a-b7ec-6f1dd0464cb9",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}