{
  "annotation_id": "14a70cf5-c6fb-47af-ac7d-9399ee479381",
  "date_created": "2026-03-02T18:00:25.212000Z",
  "date_modified": "2026-03-02T18:00:25.212000Z",
  "file_hash": "5e627c223eb7114f1204c044200c42b14019c65c781df79277a5dc544458d126",
  "private": false,
  "record": {
    "abstract": "The centrality dependence of (multi-)strange hadron abundances is studied for\nPb(158 AGeV)Pb reactions and compared to p(158 GeV)Pb collisions. The\nmicroscopic transport model UrQMD is used for this analysis. The predicted\nLambda/pi-, Xi-/pi- and Omega-/pi- ratios are enhanced due to rescattering in\ncentral Pb-Pb collisions as compared to peripheral Pb-Pb or p-Pb collisions. A\nreduction of the constituent quark masses to the current quark masses m_s \\sim\n230 MeV, m_q \\sim 10 MeV, as motivated by chiral symmetry restoration, enhances\nthe hyperon yields to the experimentally observed high values. Similar results\nare obtained by an ad hoc overall increase of the color electric field strength\n(effective string tension of kappa=3 GeV/fm). The enhancement depends strongly\non the kinematical cuts. The maximum enhancement is predicted around\nmidrapidity. For Lambda\u0027s, strangeness suppression is predicted at\nprojectile/target rapidity. For Omega\u0027s, the predicted enhancement can be as\nlarge as one order of magnitude. Comparisons of Pb-Pb data to proton induced\nasymmetric (p-A) collisions are hampered due to the predicted strong asymmetry\nin the various rapidity distributions of the different (strange) particle\nspecies. In p-Pb collisions, strangeness is locally (in rapidity) not\nconserved. The present comparison to the data of the WA97 and NA49\ncollaborations clearly supports the suggestion that conventional (free)\nhadronic scenarios are unable to describe the observed high (anti-)hyperon\nyields in central collisions. The doubling of the strangeness to nonstrange\nsuppression factor, gamma_s \\approx 0.65, might be interpreted as a signal of a\nphase of nearly massless particles.",
    "arxiv_id": "nucl-th/9907026",
    "authors": [
      "Sven Soff",
      "Steffen A. Bass",
      "Marcus Bleicher",
      "Larissa Bravina",
      "Mark Gorenstein",
      "Eugen Zabrodin",
      "Horst Stoecker",
      "Walter Greiner"
    ],
    "categories": [
      "nucl-th",
      "hep-ph",
      "nucl-ex"
    ],
    "doi": "10.1016/S0370-2693(99)01318-0",
    "journal_ref": "Phys.Lett.B471:89-96,1999",
    "title": "Strangeness Enhancement in Heavy Ion Collisions - Evidence for   Quark-Gluon-Matter ?",
    "url": "https://arxiv.org/abs/nucl-th/9907026"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "75e52ae0-5a4c-41d8-b79d-f8734b37ecc9",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}