{
  "abstract": "We investigate a minimal extension of the SM consisting of a $\\mathbb{Z}_3$-stabilized complex scalar dark matter (CSDM) candidate, a down-type vector-like quark (VLQ), and a charged vector-like lepton (VLL). The additional vector-like fermions not only enable the CSDM to reproduce the observed relic abundance beyond the Higgs-resonance region through semi-annihilation and co-annihilation processes, but also induce correlated signatures across flavor, electroweak precision, dark matter, and collider observables. We perform a comprehensive one-loop analysis of neutral meson mixing, rare meson decays, charged lepton flavor violation, anomalous magnetic moments of charged leptons, and $Z$-pole observables. We find that neutral meson mixing and rare meson decays provide the dominant constraints on the VLQ sector, while charged lepton flavor-violating processes strongly restrict the VLL Yukawa couplings. Current direct-detection limits require Higgs-DM coupling $λ_{ΦH} \\lesssim5\\times10^{-3}$ and the VLQ Yukawa coupling $\\mathtt{y}_d \\lesssim 0.05$ for TeV-scale VLQ masses, whereas present indirect-detection searches impose no additional constraints. Combining all flavor, electroweak precision, dark matter, and collider constraints, we identify viable parameter regions with CSDM masses above approximately $1.0~\\rm TeV$ and VLQ masses above about $1.5~\\rm TeV$. We also find that the LHC can exclude VLQs (VLLs) with masses up to approximately $1.6~(0.38)$ TeV, depending on the CSDM mass, at the $2σ$ confidence level. The HL-LHC can further probe an extended region of the parameter space, with discovery prospects at the $3σ$ level. Finally, we demonstrate the complementarity of flavor, dark matter, and collider searches in probing this framework.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.09120",
  "author_total": 5,
  "authors": [
    {
      "name": "Lipika Kolay"
    },
    {
      "name": "Rusa Mandal"
    },
    {
      "name": "Manimala Mitra"
    },
    {
      "name": "Dipankar Pradhan"
    },
    {
      "name": "Subham Saha"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/ayvhmst4j997b.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.09120",
  "fulltext_url": null,
  "id": "ayvhmst4j997b",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.09120",
  "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",
      "3106|Particle physics theoretical and experimental studies"
    ]
  ],
  "openalex": "W7212084385",
  "pdf_url": "https://arxiv.org/pdf/2609.09120",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-08",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/ayvhmst4j997b.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:19:52Z",
      "native_id": "2609.09120",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.09120"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ph",
      "subfield": "high-energy"
    }
  ],
  "title": "Complex Scalar Dark Matter with a Vector-Like Quark and Lepton: Precision, Flavor, and HL-LHC",
  "title_text": "Complex Scalar Dark Matter with a Vector-Like Quark and Lepton: Precision, Flavor, and HL-LHC",
  "type": "preprint",
  "updated_at": "2026-10-30T12:19:52Z",
  "url": "https://research.draconitic.com/paper/ayvhmst4j997b",
  "venue": "arXiv",
  "versions": []
}