{
  "annotation_id": "d7fb0604-1e97-457b-b287-cd2e1d376d21",
  "date_created": "2026-03-02T18:00:22.149000Z",
  "date_modified": "2026-03-02T18:00:22.149000Z",
  "file_hash": "fec7313ae39476409d774478c54a48fb671b9100efb9ebb1f5169597aab05191",
  "private": false,
  "record": {
    "abstract": "We study Pb+Pb collisions at 158 A GeV/c using a hydrodynamical approach. We\ntest different equations of state (EoSs) and different initial conditions and\nshow that there are more than one initial state for each EoS which reproduce\nthe observed hadronic spectra. We also find that different equations of state\nfavour different freeze-out temperature. Simultaneously we calculate the\nthermal dilepton and photon spectra for each EoS and initial state. We compare\nthe dilepton mass spectrum to data measured by the CERES collaboration and find\nthat the differences in spectra obtained using different EoSs and initial\nstates are not resolvable within the current experimental resolution. However,\nat invariant masses over 2 GeV the difference in the yield due to various\ninitial states is close to an order of magnitude. We also study the rapidity\ndistribution of lepton pairs and find that for masses around 800 MeV the shape\nof the distribution depends strongly on the EoS.",
    "arxiv_id": "nucl-th/9807076",
    "authors": [
      "Pasi Huovinen",
      "P. V. Ruuskanen",
      "Josef Sollfrank"
    ],
    "categories": [
      "nucl-th",
      "hep-ph"
    ],
    "doi": "10.1016/S0375-9474(99)00107-4",
    "journal_ref": "Nucl.Phys. A650 (1999) 227-244",
    "title": "Sensitivity of electromagnetic spectra to equation of state and initial   energy density in the Pb+Pb collisions at SPS",
    "url": "https://arxiv.org/abs/nucl-th/9807076"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "99ebd99a-8520-4eae-8b1d-3fab15c4d296",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}