{
  "annotation_id": "fce80bc5-078a-400d-b509-3b35619f4af2",
  "date_created": "2026-03-02T18:00:04.751000Z",
  "date_modified": "2026-03-02T18:00:04.751000Z",
  "file_hash": "f33a4abbb6b648498fc4a9b6c6fa0b0d7b343047014d1ad7283fa59277433784",
  "private": false,
  "record": {
    "abstract": "The linear $\\s$-model is used to study the effects of chiral symmetry in\nunitarized amplitudes incorporating scalar resonances. When just a single\nresonance is present, we show that the iteration of a chiral tree amplitude by\nmeans of regularized two-pion loops preserves the smallness of $\\p\\p$\ninteraction at low energies and estimate the importance of pion off-shell\ncontributions. The inclusion of a second resonance is performed by means of a\nchiral extension of the linear $\\s$-model lagrangian. The new $\\p\\p$ ampitude\nat tree level complies with low-energy theorems, depends on a mixing angle and\nhas a zero for a given energy between the resonance masses. The unitarization\nof this amplitude by means of two-pion loops preserves both its chiral low\nenergy behavior and the position of this zero confirming, in a lagrangian\nframework, conclusions drawn previously by T\\\"ornqvist. Finally, we approximate\nand generalize our results and give a friendly expression that can be used in\nthe parametrization of $N$ coupled scalar resonances.",
    "arxiv_id": "nucl-th/0502001",
    "authors": [
      "L. O. Arantes",
      "M. R. Robilotta"
    ],
    "categories": [
      "nucl-th"
    ],
    "title": "Chiral symmetry and parametrization of scalar resonances",
    "url": "https://arxiv.org/abs/nucl-th/0502001"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "2f4ca285-87c4-4766-9fee-7df2cabc2ca7",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}