{
  "abstract": "The pair transverse momentum ($k_T$) and collision-energy ($\\sqrt{s_{NN}}$) dependent difference between $π^{+}π^{+}$ and $π^{-}π^{-}$ femtoscopic correlations was observed by the HADES and STAR Collaborations. We investigate how much of the observed splitting can be accounted for by Coulomb dynamics in 0-10\\% central Au+Au collisions at $\\sqrt{s_{NN}}=2.42$-5.2 GeV. Using the UrQMD model and the CRAB programme, three transport scenarios that successively include baryon-baryon, baryon-meson, and meson-meson Coulomb interactions are considered. In a separate calculation based on the baryon-baryon reference, we reconstruct the time-dependent effective charge $Z_{\\rm{eff}}(t)$ and radius $R_{\\rm{eff}}(t)$ of the residual charged source and propagate each pion from its individual last strong-interaction point through the evolving field. The calculations reproduce the main $k_{T}$ and $\\sqrt{s_{NN}}$ dependences of the radii. Baryon--meson Coulomb interactions generate most of the additional charge splitting in the microscopic calculation. The residual-source treatment also enhances the longitudinal and sideward radius ratios relative to the reference, whereas the outward ratio changes little, and the enhancement generally decreases with increasing $\\sqrt{s_{NN}}$. Within the present framework, this contribution does not fully account for the data, motivating further investigation of the charged-source geometry and its interplay with strong-interaction dynamics.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": "Journal reference: Phys. Lett. B 882 (2026) 141081",
  "arxiv": "2609.23422",
  "author_total": 3,
  "authors": [
    {
      "name": "Pengcheng Li"
    },
    {
      "name": "Yongjia Wang"
    },
    {
      "name": "Qingfeng Li"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/dc0zbxwjhhzgq.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.23422",
  "fulltext_url": null,
  "id": "dc0zbxwjhhzgq",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.23422",
  "language": null,
  "licence": "CC0-1.0",
  "licence_label": "CC0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/publicdomain/zero/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "nucl-ex"
    ],
    [
      "arxiv",
      "nucl-th"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2609.23422",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-27",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/dc0zbxwjhhzgq.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:35:50Z",
      "native_id": "2609.23422",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.23422"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:nucl-ex",
      "subfield": "nuclear"
    }
  ],
  "title": "Dynamical Coulomb effects on charged-pion HBT-radius splitting in central Au+Au collisions at few-GeV energies",
  "title_text": "Dynamical Coulomb effects on charged-pion HBT-radius splitting in central Au+Au collisions at few-GeV energies",
  "type": "preprint",
  "updated_at": "2026-10-30T12:35:50Z",
  "url": "https://research.draconitic.com/paper/dc0zbxwjhhzgq",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.1016/j.physletb.2026.141081",
      "pid": "0xvd0qkhv8gf1",
      "relation": "published-as",
      "title": "Dynamical Coulomb effects on charged-pion HBT-radius splitting in central Au+Au collisions at few-GeV energies",
      "venue": "Physics Letters B"
    }
  ]
}