{
  "abstract": "Using $K_1(1270)\\to Kππ$ amplitude models constrained by the charmed-meson semileptonic decays $D^{+(0)}\\to K^-π^+π^{0(-)} e^+ν_e$, we present a model-dependent estimate of the up-down asymmetry observed in $B^+\\to K^+π^+π^-γ$ in the mass region $M_{K^+π^+π^-}\\in[1.1,1.3]$~GeV/$c^2$. Estimates based on an isolated $K_1(1270)$ show significant model dependence, but systematically lie below the measured asymmetry $\\bar{\\mathcal{H}}_{\\mathrm{ud}}=(0.092\\pm0.023)$ when assuming $λ_γ=1$. We also explore interference with the $K_1(1400)$ tail and find that it can appreciably reduce the tension.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2611.03035",
  "author_total": 2,
  "authors": [
    {
      "name": "Yijia Zeng"
    },
    {
      "name": "Hailong Ma"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/9eg22ktsbz3zh.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2611.03035",
  "fulltext_url": null,
  "id": "9eg22ktsbz3zh",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2611.03035",
  "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"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2611.03035",
  "pmcid": null,
  "pmid": null,
  "published": "2026-11-02",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/9eg22ktsbz3zh.ris",
  "sources": [
    {
      "first_seen": "2026-11-03T12:20:59Z",
      "native_id": "2611.03035",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2611.03035"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ex",
      "subfield": "high-energy"
    }
  ],
  "title": "Study of the up-down asymmetry in $B^+\\to K^+π^+π^-γ$ using $K_1(1270)$ amplitudes constrained by semileptonic $D$ Decays",
  "title_text": "Study of the up-down asymmetry in B^+→ K^+π^+π^-γ using K_1(1270) amplitudes constrained by semileptonic D Decays",
  "type": "preprint",
  "updated_at": "2026-11-05T15:20:18Z",
  "url": "https://research.draconitic.com/paper/9eg22ktsbz3zh",
  "venue": "arXiv",
  "versions": []
}