{
  "annotation_id": "9f041715-31a8-4ec8-8fc6-245564f00d2f",
  "date_created": "2026-03-02T18:00:18.784000Z",
  "date_modified": "2026-03-02T18:00:18.784000Z",
  "file_hash": "7e9c2a317410575edcb07b892352fc456bb8a758466079e4c7d26c82211c231f",
  "private": false,
  "record": {
    "abstract": "We investigate the production of $e^+e^-$ pairs from $p + Be$ and\nnucleus-nucleus collisions from 2 GeV/A to 200 GeV/A within a covariant\ntransport approach and focus on the dilepton angular anisotropies as a function\nof the dilepton invariant mass. Whereas the low mass regime yields information\nabout the Dalitz decays of the $\\Delta, \\eta$ and $\\omega$, above M $\\approx\n$0.5 GeV the angular anisotropies provide additional information about the\n$\\pi^+\\pi^- \\to \\rho^0 \\to e^+e^-$ channel in the medium. The anisotropy\ncoefficient is found to change its sign for M $\u003e$ 0.5 GeV in case of\nnucleus-nucleus reactions when increasing the bombarding energy from 2 GeV/A to\n200 GeV/A which sheds some light on the $\\pi \\pi \\to \\rho$ dynamics.",
    "arxiv_id": "nucl-th/9605025",
    "authors": [
      "E. L. Bratkovskaya",
      "W. Cassing",
      "U. Mosel"
    ],
    "categories": [
      "nucl-th"
    ],
    "journal_ref": "Z.Phys. C75 (1997) 119-126",
    "title": "Probing Hadronic Polarizations with Dilepton Anisotropies",
    "url": "https://arxiv.org/abs/nucl-th/9605025"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "8a2baf44-d492-4437-99e4-b2d9413f346d",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}