{
  "abstract": "As the lightest strange scalar resonance, $$K_0^*(700)$$ K 0 ∗ ( 700 ) (also called $$\\kappa $$ κ ) has a large width and resides close to the $$K\\pi $$ K π threshold, leading to a longstanding debate about its internal structure. Within the framework of the conventional quark-antiquark ( $$q\\bar{q}$$ q q ¯ ) picture, this paper attempts to research the behaviors of $$K_0^*(700)$$ K 0 ∗ ( 700 ) resonance in the four-body final state decays. Firstly, we investigate the $$K_0^*(700)$$ K 0 ∗ ( 700 ) resonance one twist-2 and two twist-3 light-cone distribution amplitudes (LCDAs), i.e. $$\\phi _{2;K_0^*(700)}(x, \\mu )$$ ϕ 2 ; K 0 ∗ ( 700 ) ( x , μ ) and $$\\phi _{3;K_0^*(700)}^{p;\\sigma }(x, \\mu )$$ ϕ 3 ; K 0 ∗ ( 700 ) p ; σ ( x , μ ) , by constructing a light-cone harmonic oscillator model. For the longitudinal distribution characteristics of the twist-2 LCDA, two typical parametrization schemes, i.e. $$\\varphi _{2;K_0^*(700)}^\\mathrm{(S1)}(x)$$ φ 2 ; K 0 ∗ ( 700 ) ( S 1 ) ( x ) and $$\\varphi _{2;K_0^*(700)}^\\mathrm{(S2)}(x)$$ φ 2 ; K 0 ∗ ( 700 ) ( S 2 ) ( x ) , are adopted in this paper. Meanwhile, it has enriched theoretical predictions for the first ten-order LCDAs $$\\xi $$ ξ -moments. Subsequently, we apply the QCD light-cone sum rules approach to compute the $$\\bar{B}_s^0 \\rightarrow K_0^*(700)$$ B ¯ s 0 → K 0 ∗ ( 700 ) transition form factors (TFFs) $$f_\\pm ^{\\bar{B}_s^0 K_0^*(700)}(q^2)$$ f ± B ¯ s 0 K 0 ∗ ( 700 ) ( q 2 ) and $$f_\\textrm{T}^{\\bar{B}_s^0 K_0^*(700)}(q^2)$$ f T B ¯ s 0 K 0 ∗ ( 700 ) ( q 2 ) , including the next-to-leading order perturbative $$\\mathcal {O}(\\alpha _s)$$ O ( α s ) corrections to the twist-2 LCDA contributions. By using the simplified series expansion parameterization, these TFFs are extrapolated over the full physical region. Then, we calculate the differential decay widths and branching fractions for four-body semileptonic decay $$\\bar{B}_s^0 \\rightarrow K^0\\pi ^+ \\ell ^-\\bar{\\nu }_\\ell $$ B ¯ s 0 → K 0 π + ℓ - ν ¯ ℓ with $$\\ell = (e, \\mu , \\tau )$$ ℓ = ( e , μ , τ ) via the S -wave $$K_0^*(700)$$ K 0 ∗ ( 700 ) resonance in the $$K\\pi $$ K π system, respectively. We expect that the obtained prediction results will provide valuable insights for future experiments and theoretical research.",
  "abstract_shown": true,
  "affiliations": [
    "Guizhou Minzu University"
  ],
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  "author_total": 5,
  "authors": [
    {
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        0
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      "name": "Dong Huang",
      "orcid": "0009-0004-0751-7704"
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    {
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        0
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      "name": "Sheng-Bo Wu",
      "orcid": "0009-0006-4961-1947"
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    {
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        0
      ],
      "name": "Fang-Ping Peng",
      "orcid": "0009-0007-7145-7525"
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    {
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        0
      ],
      "name": "Long Zeng",
      "orcid": "0000-0001-8512-8836"
    },
    {
      "affs": [
        0
      ],
      "name": "Hai-Bing Fu",
      "orcid": "0000-0003-2466-6213"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/d3dbh7d7jvpgc.bib",
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  "doi": "10.1140/epjc/s10052-026-16484-4",
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  "pdf_url": "https://link.springer.com/content/pdf/10.1140/epjc/s10052-026-16484-4.pdf",
  "pmcid": null,
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  "published": "2026-10-01",
  "publisher": "Springer Science and Business Media LLC",
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  "title": "Addressing the lightest S-wave strange $$K_0^*(700)/\\kappa $$ resonance in four-body semileptonic $$\\bar{B}_s^0 \\rightarrow K^0\\pi ^+ \\ell ^-\\bar{\\nu }_\\ell $$ decays",
  "title_text": "Addressing the lightest S-wave strange K_0^*(700)/κ resonance in four-body semileptonic B̅_s^0 → K^0π ^+ ℓ ^-ν ̅_ℓ decays",
  "type": "peer-reviewed",
  "updated_at": "2026-11-03T14:20:50Z",
  "url": "https://research.draconitic.com/paper/d3dbh7d7jvpgc",
  "venue": "The European Physical Journal C",
  "versions": [
    {
      "doi": "10.48550/arxiv.2606.24223",
      "pid": "22xcd5memjqmc",
      "relation": "preprint",
      "title": "Addressing the lightest $S$-wave strange $K_0^*(700)/κ$ resonance in four-body semileptonic $\\bar{B}_s^0 \\to K^0π^+ \\ell^-\\barν_\\ell$ decays",
      "venue": "arXiv"
    }
  ]
}