{
  "abstract": "Baryon-to-meson enhancements are commonly compared across collision systems at equal multiplicity. Using published data only, we test whether the $p_T$ dependence of the CMS $Λ/K^0_S$ ratio in minimum-bias O-O collisions at $\\sqrt{s_{NN}}=5.36$ TeV can be obtained from CMS multiplicity-differential p-Pb and Pb-Pb measurements weighted with the O-O multiplicity distribution. The prediction from p-Pb collisions of equal multiplicity is harder than the data, with a tilt of $+0.35\\pm0.04$ in $\\ln(\\mathrm{prediction}/\\mathrm{data})$ versus $\\ln p_T$, whereas that from peripheral Pb-Pb collisions is consistent with the data. In a Glauber model calibrated on O-O data, O-O and peripheral Pb-Pb collisions of equal multiplicity have similar transverse densities $ρ=\\langle(dN_{ch}/dη)/S_\\perp\\rangle$, about half of that in p-Pb. Matching the p-Pb reference in $ρ$ instead of multiplicity reduces the tilt by about 60%, to $+0.14\\pm0.04$, with nucleons as sources; the tension is fully removed ($-0.02\\pm0.04$) only when sub-nucleonic structure is included (three constituents per nucleon), so the conclusion depends on the modeled size of high-multiplicity p-Pb collisions. The published blast-wave velocities of p-Pb and Pb-Pb collisions, which differ at equal multiplicity, are close at equal $ρ$. Multiplicity alone thus does not determine the $Λ/K^0_S$ shape across systems; the data are consistent with a radial boost governed by the transverse density, as expected from hydrodynamics. The same pattern is found in EPOS4, which has a hydrodynamic core, but not in PYTHIA Angantyr. For Ne-Ne collisions, which have the transverse density of O-O at equal multiplicity, the minimum-bias ratio is predicted to agree with O-O within 3-5%, as EPOS4 also predicts.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2611.04865",
  "author_total": 2,
  "authors": [
    {
      "name": "Neeraj"
    },
    {
      "name": "Amal Sarkar"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/f6k0nt6pp8658.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2611.04865",
  "fulltext_url": null,
  "id": "f6k0nt6pp8658",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2611.04865",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "hep-ph"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2611.04865",
  "pmcid": null,
  "pmid": null,
  "published": "2026-11-03",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/f6k0nt6pp8658.ris",
  "sources": [
    {
      "first_seen": "2026-11-04T15:21:25Z",
      "native_id": "2611.04865",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2611.04865"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ph",
      "subfield": "high-energy"
    }
  ],
  "title": "Multiplicity and transverse density as ordering variables of the $Λ/K^0_S$ ratio in oxygen-oxygen collisions at the LHC",
  "title_text": "Multiplicity and transverse density as ordering variables of the Λ/K^0_S ratio in oxygen-oxygen collisions at the LHC",
  "type": "preprint",
  "updated_at": "2026-11-05T15:20:35Z",
  "url": "https://research.draconitic.com/paper/f6k0nt6pp8658",
  "venue": "arXiv",
  "versions": []
}