{
  "abstract": "We introduce a $B$-decay tagged energy correlator (BTEC) to resolve the angular structure of energy flow in inclusive $B$ decays in the endpoint region, focusing on the direct-photon contribution to $\\overline B\\to X_sγ$. At leading power and at the natural collinear angular scale $τ\\sim s\\sim QΛ_{\\rm QCD}$, we derive a factorization relation involving the standard hard coefficient and $B$-meson shape function together with a new measured quark jet function; no new leading-power nonperturbative function is introduced. We calculate the measured jet function at one-loop accuracy and verify that its angular integral reproduces the standard inclusive quark jet function. For the central Bosch--Lange--Neubert--Paz parameter set, an illustrative benchmark gives $3 - 16\\%$ migration outside the fixed angular cuts $τ_c=2 - 4~{\\rm GeV}^2$. With an independently constrained shape function, the angular cumulatives provide a closure test of leading-power endpoint factorization and are sensitive to direct-$O_7$ power corrections and resolved-photon effects. The BTEC thereby adds information on the angular structure of the inclusive recoil jet beyond the ordinary photon spectrum and may improve signal--background discrimination when their energy-flow profiles differ.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": "Journal reference: JHEP11(2026)028",
  "arxiv": "2607.27367",
  "author_total": 1,
  "authors": [
    {
      "name": "Shuai Zhao"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/e4j00kq3mchye.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2607.27367",
  "fulltext_url": null,
  "id": "e4j00kq3mchye",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2607.27367",
  "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"
    ],
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      "arxiv",
      "hep-ph"
    ],
    [
      "openalex",
      "3106|Particle physics theoretical and experimental studies"
    ]
  ],
  "openalex": "W7172031015",
  "pdf_url": "https://arxiv.org/pdf/2607.27367",
  "pmcid": null,
  "pmid": null,
  "published": "2026-07-29",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/e4j00kq3mchye.ris",
  "sources": [
    {
      "first_seen": "2026-11-05T15:20:56Z",
      "native_id": "2607.27367",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2607.27367"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ex",
      "subfield": "high-energy"
    }
  ],
  "title": "Photon-Tagged Energy Flow in Inclusive Endpoint $B$ Decays",
  "title_text": "Photon-Tagged Energy Flow in Inclusive Endpoint B Decays",
  "type": "preprint",
  "updated_at": "2026-11-08T21:20:26Z",
  "url": "https://research.draconitic.com/paper/e4j00kq3mchye",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.1007/jhep11(2026)028",
      "pid": "9ge1tfwsfmv7y",
      "relation": "published-as",
      "title": "Photon-tagged energy flow in inclusive endpoint B decays",
      "venue": "Journal of High Energy Physics"
    }
  ]
}