{
  "annotation_id": "8a0ac9f4-fa86-457f-a7d1-1e882d8fbf2f",
  "date_created": "2026-03-02T18:00:08.368000Z",
  "date_modified": "2026-03-02T18:00:08.368000Z",
  "file_hash": "aaac725623e7fceb556613bdf383b8024285d1ca5b4c5196a52d476ce71a8b68",
  "private": false,
  "record": {
    "abstract": "Within an effective hadronic model including electromagnetic interactions via\na U$_{\\rm em}$(1) gauge, we reinvestigate photon Bremsstrahlung from a hot\nhadronic gas as expected to be formed in relativistic heavy-ion collisions at\nSPS energies. We calculate photon emission from the reactions\n$\\pi\\pi\\to\\pi\\pi\\gamma$ and $\\pi K \\to\\pi K\\gamma$ by an explicit (numerical)\nevaluation of the multi-dimensional phase space integral. This, in particular,\nallows to avoid the commonly employed soft photon approximation (SPA), as well\nas to incorporate final-state thermal enhancement factors. % during the\nhadronic stage of the fireball. Both improvements are shown to result in an\nappreciable increase of the photon production rate over previous hadronic\ncalculations. Upon convolution over a thermal fireball we find an improvement\nin the description of recent low transverse-momentum WA98 data at SPS. The\ninfluence of both Landau-Pomeranchuk-Migdal and in-medium effects on \"$\\sigma$\"\nand $\\rho$-meson exchanges are briefly discussed.",
    "arxiv_id": "nucl-th/0604031",
    "authors": [
      "W. Liu",
      "R. Rapp"
    ],
    "categories": [
      "nucl-th"
    ],
    "doi": "10.1016/j.nuclphysa.2007.08.014",
    "journal_ref": "Nucl.Phys.A796:101-121,2007",
    "title": "Low-Energy Thermal Photons from Meson-Meson Bremsstrahlung",
    "url": "https://arxiv.org/abs/nucl-th/0604031"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "e188e35d-cfd9-48b9-ab21-f29633cb97d6",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}