{
  "abstract": "We show that the $ρ\\toππ$ helicity convention used in the time-dependent Dalitz-plot measurements of $B^0\\to(ρπ)^0$ decays does not match the convention assumed in the subsequent isospin analysis. Once corrected, the tension between the direct determination of the unitarity-triangle angle $α$ from these decays and its indirect determination from global fits decreases from $2.9σ$ to $2.1σ$. Combined with the $B\\toππ$ and $B\\toρρ$ modes, the direct determination becomes $α= (87.0^{+11.8}_{-4.7})^\\circ$, compared with the original world average $(84.1^{+3.7}_{-3.0})^\\circ$.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.31828",
  "author_total": 1,
  "authors": [
    {
      "name": "Radek Žlebčík"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/4x9jdpw4zzk6p.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.31828",
  "fulltext_url": null,
  "id": "4x9jdpw4zzk6p",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.31828",
  "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": "W7214705478",
  "pdf_url": "https://arxiv.org/pdf/2609.31828",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-25",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/4x9jdpw4zzk6p.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:25:12Z",
      "native_id": "2609.31828",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.31828"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ex",
      "subfield": "high-energy"
    }
  ],
  "title": "Impact of Helicity-Isospin Convention Matching on the Extraction of $α$ from $B^0\\to(ρπ)^0$",
  "title_text": "Impact of Helicity-Isospin Convention Matching on the Extraction of α from B^0→(ρπ)^0",
  "type": "preprint",
  "updated_at": "2026-10-30T12:25:12Z",
  "url": "https://research.draconitic.com/paper/4x9jdpw4zzk6p",
  "venue": "arXiv",
  "versions": []
}