{
  "abstract": "Following the discovery of the exotic state $X(3872)$ in the charmonium spectrum, the possible existence of an analogous state, $X_b$, in the bottomonium sector has attracted considerable attention of the hadronic physics community. In this work, we lay the ground for the development of Born-Oppenheimer chiral effective field theory (BO$χ$EFT), that allows us to include both quark and hadron degrees of freedom as well as the full complexity of the meson-exchange potential in a systematic way. For illustration, the formalism to leading order (LO) is applied to the system of $χ_{b1}$ states and in particular the $X_b$. The two parameters that are present at this order are constrained using experimental information on the bottomonium spectrum together with lattice input on static quark-antiquark potentials, including string breaking effects. The framework identifies the observed $1^{++}$ state at 10.513 GeV with a predominantly molecular $X_b$, the bottom counterpart of the $X(3872)$, and predicts an additional predominantly compact bottomonium state at 10.544 GeV, about 60 MeV below the $B\\bar{B}^*$ threshold.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.19066",
  "author_total": 5,
  "authors": [
    {
      "name": "Yu Zhang"
    },
    {
      "name": "Feng-Kun Guo"
    },
    {
      "name": "Christoph Hanhart"
    },
    {
      "name": "Alexey Nefediev"
    },
    {
      "name": "Paul Pütz"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/6k4v03cyw2h1y.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.19066",
  "fulltext_url": null,
  "id": "6k4v03cyw2h1y",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.19066",
  "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-lat"
    ],
    [
      "arxiv",
      "hep-ph"
    ],
    [
      "openalex",
      "3106|Quantum Chromodynamics and Particle Interactions"
    ]
  ],
  "openalex": "W7222074649",
  "pdf_url": "https://arxiv.org/pdf/2610.19066",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-13",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/6k4v03cyw2h1y.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:29:31Z",
      "native_id": "2610.19066",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.19066"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ex",
      "subfield": "high-energy"
    }
  ],
  "title": "Born-Oppenheimer chiral effective field theory and its application to $X_b$",
  "title_text": "Born-Oppenheimer chiral effective field theory and its application to X_b",
  "type": "preprint",
  "updated_at": "2026-10-30T12:29:31Z",
  "url": "https://research.draconitic.com/paper/6k4v03cyw2h1y",
  "venue": "arXiv",
  "versions": []
}