{
  "abstract": "The electron-positron Future Circular Collider will provide an unprecedented opportunity for precision studies at the $Z$ pole. In addition to improving the electroweak measurements pioneered at LEP, Tera-$Z$ statistics and modern jet flavor reconstruction could make rare, flavor-resolved final states accessible as precision observables. We study the exclusive four-body processes $e^+e^-\\to Z\\to Q\\bar Q\\ell^+\\ell^-$ with $ Q=c,\\,b$ and $\\ell=μ,\\,τ$ as probes of flavor-specific new physics contact interactions. A fast analysis yields representative multi-TeV reaches for vector-current interactions involving bottom or charm quarks and muons or taus, providing a baseline for future detector-level studies. For charm-current interactions, the projected direct sensitivities are comparable to those obtained indirectly from electroweak precision observables. Two-dimensional fits further show that these processes retain quark-flavor information that can be poorly resolved by the renormalization-group-induced electroweak response. These results illustrate how flavor-resolved four-body $Z$ processes can bridge the electroweak and flavor programs at FCC-ee, opening a new class of complementary precision observables.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.36933",
  "author_total": 1,
  "authors": [
    {
      "name": "Syuhei Iguro"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/fxr0tcb7d1e6s.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.36933",
  "fulltext_url": null,
  "id": "fxr0tcb7d1e6s",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.36933",
  "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-ex"
    ],
    [
      "arxiv",
      "hep-ph"
    ],
    [
      "openalex",
      "3106|Particle physics theoretical and experimental studies"
    ]
  ],
  "openalex": "W7214984629",
  "pdf_url": "https://arxiv.org/pdf/2609.36933",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-29",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/fxr0tcb7d1e6s.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:25:31Z",
      "native_id": "2609.36933",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.36933"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ex",
      "subfield": "high-energy"
    }
  ],
  "title": "Flavor-resolved four-fermion probes at the FCC-ee $Z$ pole",
  "title_text": "Flavor-resolved four-fermion probes at the FCC-ee Z pole",
  "type": "preprint",
  "updated_at": "2026-10-30T12:25:31Z",
  "url": "https://research.draconitic.com/paper/fxr0tcb7d1e6s",
  "venue": "arXiv",
  "versions": []
}