{
  "abstract": "The LHCb Collaboration has observed a narrow state in the $\\bar{B}_s^0π^0$ spectrum, about 74 MeV below the $B^-K^+$ threshold, which is the natural candidate for the bottom partner of the $D_{s0}^*(2317)$. Such a state had been predicted as a $\\bar{B}K$ bound state by unitarized heavy-meson chiral perturbation theory with lattice-QCD input. We analyze the LHCb spectrum with these coupled-channel amplitudes, including isospin breaking through the physical meson masses, $π^0$-$η$ mixing, and $m_u\\neq m_d$ in the chiral amplitudes, thereby allowing the $\\bar{B}_{s0}^*$ to decay through its only open strong channel, $\\bar{B}_s^0π^0$. With the parameters fixed by lattice QCD and no experimental input from the LHCb measurement, the predicted state lies within 1.1-1.7 standard deviations of the observed peak. Adjusting a single parameter, the spectrum is described as well as with the zero-width limit of the LHCb analysis. The new state thus emerges naturally from these amplitudes, with a large $\\bar{B}K$ component and an isospin-violating width of tens of keV, and its $J^P=1^+$ heavy-quark spin partner is predicted with a precision comparable to that of the measured mass.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.38022",
  "author_total": 4,
  "authors": [
    {
      "name": "Miguel Albaladejo"
    },
    {
      "name": "Pablo Encarnación"
    },
    {
      "name": "Albert Feijoo"
    },
    {
      "name": "Juan M. Nieves"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/c5wajeevxyp10.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.38022",
  "fulltext_url": null,
  "id": "c5wajeevxyp10",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.38022",
  "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|Quantum Chromodynamics and Particle Interactions"
    ]
  ],
  "openalex": "W7214977808",
  "pdf_url": "https://arxiv.org/pdf/2609.38022",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-29",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/c5wajeevxyp10.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:25:31Z",
      "native_id": "2609.38022",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.38022"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ex",
      "subfield": "high-energy"
    }
  ],
  "title": "The new LHCb beauty-strange state as the bottom partner of the $D_{s0}^*(2317)$: a LQCD constrained coupled-channel chiral analysis",
  "title_text": "The new LHCb beauty-strange state as the bottom partner of the D_s0^*(2317): a LQCD constrained coupled-channel chiral analysis",
  "type": "preprint",
  "updated_at": "2026-10-30T12:25:31Z",
  "url": "https://research.draconitic.com/paper/c5wajeevxyp10",
  "venue": "arXiv",
  "versions": []
}