{
  "abstract": "We report the measurement of direct virtual photon ($γ^*_\\text{dir} \\rightarrow e^+e^-$) in four Au+Au collision energies at $\\sqrt{s_\\text{NN}}$ = 14.6--54.4 GeV. The $γ^*_\\text{dir}$ yields scale with charged-particle multiplicity ($(dN_{\\mathrm{ch}}/dη)^α$) as $α=1.43 \\pm 0.04 \\text{(stat.)} \\pm 0.03\\text{(sys.)}$, independent of collision energies and centralities, exceeding hadronic expectations and indicating notable contribution from QGP phase. At $\\sqrt{s_{\\rm NN}}=$ 54.4 GeV, the direct virtual photon mass distributions are further studied over $0.1 < M_{ee} < 1.1$ GeV/$c^2$, and are found to evolve from exponential to power-law form with increasing $p_\\text{T}$, signaling a shift from \"blackbody\" radiation to emission governed by Kroll-Wada formalism.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.19680",
  "author_total": 1,
  "authors": [
    {
      "name": "STAR Collaboration"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/29vjn6jw6834a.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.19680",
  "fulltext_url": null,
  "id": "29vjn6jw6834a",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.19680",
  "language": null,
  "licence": "CC-BY-NC-ND-4.0",
  "licence_label": "CC BY-NC-ND 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by-nc-nd/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "nucl-ex"
    ],
    [
      "openalex",
      "3106|High-Energy Particle Collisions Research"
    ]
  ],
  "openalex": "W7222053514",
  "pdf_url": "https://arxiv.org/pdf/2610.19680",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-14",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/29vjn6jw6834a.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:29:31Z",
      "native_id": "2610.19680",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.19680"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:nucl-ex",
      "subfield": "nuclear"
    }
  ],
  "title": "Probing the production mechanisms of virtual photons at RHIC",
  "title_text": "Probing the production mechanisms of virtual photons at RHIC",
  "type": "preprint",
  "updated_at": "2026-10-30T12:29:31Z",
  "url": "https://research.draconitic.com/paper/29vjn6jw6834a",
  "venue": "arXiv",
  "versions": []
}