{
  "annotation_id": "8370587a-34bb-4ae1-889a-c38a2bd7c0dc",
  "date_created": "2026-03-02T18:00:21.090000Z",
  "date_modified": "2026-03-02T18:00:21.090000Z",
  "file_hash": "0957a6f5b35926b200a24279586beccf47305c81981371837835ead3fb2bc933",
  "private": false,
  "record": {
    "abstract": "We present a dynamical study of $e^+e^-$ production in C + C and Ca + Ca\ncollisions at BEVALAC/SIS energies on the basis of the covariant transport\napproach HSD employing momentum-dependent $\\rho$-meson spectral functions that\ninclude the pion modifications in the nuclear medium as well as the\npolarization of the $\\rho$-meson due to resonant $\\rho - N$ scattering. We find\nthat the experimental data from the DLS collaboration cannot be described\nwithin the $\\rho$-meson spectral function approach. A dropping $\\eta$-mass\nscenario leads to a good reproduction of the DLS dilepton data, however,\nviolates the $m_T$-scaling of $\\pi^0$ and $\\eta$ spectra as observed by the\nTAPS collaboration as well as $\\eta$ photoproduction on nuclei.",
    "arxiv_id": "nucl-th/9710043",
    "authors": [
      "E. L. Bratkovskaya",
      "W. Cassing",
      "R. Rapp",
      "J. Wambach"
    ],
    "categories": [
      "nucl-th"
    ],
    "doi": "10.1016/S0375-9474(98)00135-3",
    "journal_ref": "Nucl.Phys. A634 (1998) 168-189",
    "title": "Dilepton production and $m_T$-scaling at BEVALAC/SIS energies",
    "url": "https://arxiv.org/abs/nucl-th/9710043"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "28f8230c-ff7b-4ce8-ba29-f9efe0e7e644",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}