{
  "abstract": "We investigate a long-lived scalar $S$ that triggers a strongly first-order electroweak phase transition (SFOEWPT) in the singlet scalar extension of standard model (SM). A sufficient small mixing angle between $S$ and the SM-like Higgs boson $h$ naturally leads to a long lifetime for $S$. We focus on the mass range $m_S>m_h/2$, where the dominant production channel at the LHC is the Higgs-mediated process $gg\\to h^*\\to SS$ with an off-shell $h$. By analyzing the finite-temperature effective potential, we identify the parameter space realizing an SFOEWPT and calculate the associated gravitational-wave spectra, finding that part of the parameter space can be probed by LISA. We further study the LHC sensitivity to the long-lived $S$ using the ATLAS detector and proposed far detectors, including ANUBIS, CODEX-b, FACET, FASER2, MoEDAL-MAPP1 and MAPP2, and MATHUSLA. The combined sensitivity of the main detector and far detectors, particularly ANUBIS and MATHUSLA, allows a large fraction of the SFOEWPT parameter space to be probed for $10^{-10}\\leq \\sinθ\\leq 10^{-5}$, with $m_S$ up to $250~\\mathrm{GeV}$. For $\\sinθ\\leq 10^{-11}$, however, the SFOEWPT parameter space becomes inaccessible to both the main detector and the far-detector searches.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.25601",
  "author_total": 4,
  "authors": [
    {
      "name": "Lei Wang"
    },
    {
      "name": "Xiaoting Zhao"
    },
    {
      "name": "Xiao-Fang Han"
    },
    {
      "name": "Hongxin Wang"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/48hpen67ymt8s.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.25601",
  "fulltext_url": null,
  "id": "48hpen67ymt8s",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.25601",
  "language": null,
  "licence": "LicenseRef-arXiv-nonexclusive-1.0",
  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "hep-ph"
    ],
    [
      "openalex",
      "3106|Particle physics theoretical and experimental studies"
    ]
  ],
  "openalex": "W7214111949",
  "pdf_url": "https://arxiv.org/pdf/2609.25601",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-25",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/48hpen67ymt8s.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:35:35Z",
      "native_id": "2609.25601",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.25601"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ph",
      "subfield": "high-energy"
    }
  ],
  "title": "Electroweak phase transition triggered by a long-lived scalar and LHC searches",
  "title_text": "Electroweak phase transition triggered by a long-lived scalar and LHC searches",
  "type": "preprint",
  "updated_at": "2026-10-30T12:35:35Z",
  "url": "https://research.draconitic.com/paper/48hpen67ymt8s",
  "venue": "arXiv",
  "versions": []
}