{
  "abstract": "We report what is, to our knowledge, the first time-resolved analysis of electroweak asymmetries at the $Z$ pole, using the public release of the recovered SLD collision data: $6.6\\times10^5$ polarized $e^+e^-\\to Z$ events from the 1996-1998 SLC runs, with 385583 selected hadronic $Z$ decays spanning 782 sidereal cycles. The left-right asymmetry $A_{LR}$, reconstructed with the published SLD selection and per-event signed Compton polarization, shows no sidereal, solar-diurnal, or annual modulation; a simultaneous unbinned likelihood fit bounds the sidereal first-harmonic amplitude at 0.0086 (95% C.L., statistical). The analysis, frozen on the initial partial release, applied unchanged to the 229833 events of the later-released 1998 run confirms the null (amplitude 0.0018, p=0.90). Using the as-built SLC beam azimuth from the release's documentation corpus, we bound the asymmetry's anisotropy tensor in the Sun-centered frame: $ρ_1\\le0.060$, $ρ_2\\le0.18$, and, for vector backgrounds, $ρ_0\\le0.092$ (95% C.L.). A leading-order matching maps these onto minimal Standard-Model-Extension coefficients as $10^{-2}$-level sensitivities to the two-time-index block of the electroweak gauge-sector coefficient $k_W$ (components with no existing laboratory constraint) and to the Higgs-sector coefficient $k_{ϕϕ}$; the insertions split the $Z$ pole by polarization, so for the tensor families assessed the resonance saturates the sidereal amplitude near $10^{-2}$ and the Born-model bounds exclude finite coefficient bands rather than set an upper limit. We also derive a previously unpublished $Z$-pole birefringence channel in the helicity-odd azimuthal modulation of the thrust axis, with response enhanced by about $2M_Z/Γ_Z$; a Born-level pilot is null. First sidereal analyses of hadronization and leptonic asymmetries bound instrumental drifts at the $10^{-4}$-$10^{-3}$ fractional level.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.40282",
  "author_total": 1,
  "authors": [
    {
      "name": "Wonyong Chung"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/c2p8nnzw5qe86.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.40282",
  "fulltext_url": null,
  "id": "c2p8nnzw5qe86",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.40282",
  "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-ex"
    ],
    [
      "arxiv",
      "hep-ph"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2610.40282",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-29",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/c2p8nnzw5qe86.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:36:28Z",
      "native_id": "2610.40282",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.40282"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ex",
      "subfield": "high-energy"
    }
  ],
  "title": "First search for sidereal and annual modulation of $Z$-pole asymmetries with the recovered SLD data set",
  "title_text": "First search for sidereal and annual modulation of Z-pole asymmetries with the recovered SLD data set",
  "type": "preprint",
  "updated_at": "2026-11-01T12:20:47Z",
  "url": "https://research.draconitic.com/paper/c2p8nnzw5qe86",
  "venue": "arXiv",
  "versions": []
}