{
  "abstract": "Using 7.33 fb$^{-1}$ of $e^+e^-$ annihilation data recorded with the BESIII detector at center-of-mass energies from 4.128 to 4.226 GeV, we report the first observation and dynamical study of the semileptonic decay $D^+_s\\to f_{0}(980) μ^+ν_μ$. The absolute branching fraction of $D^+_s\\to f_{0}(980) μ^+ν_μ$ with $ f_{0}(980)\\to π^+ π^-$ is $(1.59 \\pm 0.18_{\\rm stat} \\pm 0.11_{\\rm syst}) \\times10^{-3}$. Combining this result with our earlier BESIII measurement of ${\\mathcal B}(D^+_s\\to f_{0}(980) e^+ν_e)$, their ratio is found to be $\\frac{{\\mathcal B}(D^+_s\\to f_{0}(980) μ^+ν_μ)}{{\\mathcal B}(D^+_s\\to f_{0}(980)e^+ν_e)} = 0.92\\pm0.13_{\\rm stat}\\pm0.08_{\\rm syst}$, in agreement with the Standard Model expectation of lepton flavor universality. From a dynamical analysis of the $D_{s}^{+} \\to f_{0}(980)μ^+ν_μ$ decay with a simple pole parametrization for the hadronic transition form factor, the product of the form factor $f^{f_{0}(980)}_{+}(0)$ and the $c\\to s$ Cabibbo-Kobayashi-Maskawa matrix element $|V_{cs}|$ is determined to be $f^{f_{0}(980)}_{+}(0)|V_{cs}|=0.490\\pm0.059_{\\rm stat}\\pm0.025_{\\rm syst}$. Averaging with our previously reported result for the $D_{s}^{+} \\to f_{0}(980)e^+ν_e$ decay, we obtain $f^{f_{0}(980)}_{+}(0)|V_{cs}|=0.500\\pm0.016_{\\rm stat}\\pm0.020_{\\rm syst}$. Using $|V_{cs}|$ from the CKMfitter group, we extract $f^{f_{0}(980)}_{+}(0)=0.514\\pm0.017_{\\rm stat}\\pm0.021_{\\rm syst}$. This represents the most precise determination of the $D_{s} \\to f_{0}(980)$ transition form factor to date, and provides stringent tests of various theoretical models.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.15655",
  "author_total": 771,
  "authors": [
    {
      "name": "BESIII Collaboration"
    },
    {
      "name": "M. Ablikim"
    },
    {
      "name": "M. N. Achasov"
    },
    {
      "name": "P. Adlarson"
    },
    {
      "name": "X. C. Ai"
    },
    {
      "name": "C. S. Akondi"
    },
    {
      "name": "R. Aliberti"
    },
    {
      "name": "A. Amoroso"
    },
    {
      "name": "Q. An"
    },
    {
      "name": "Y. H. An"
    },
    {
      "name": "M. S. Anderson"
    },
    {
      "name": "Y. Bai"
    },
    {
      "name": "O. Bakina"
    },
    {
      "name": "H. R. Bao"
    },
    {
      "name": "X. L. Bao"
    },
    {
      "name": "M. Barbagiovanni"
    },
    {
      "name": "V. Batozskaya"
    },
    {
      "name": "K. Begzsuren"
    },
    {
      "name": "N. Berger"
    },
    {
      "name": "M. Berlowski"
    },
    {
      "name": "M. B. Bertani"
    },
    {
      "name": "D. Bettoni"
    },
    {
      "name": "F. Bianchi"
    },
    {
      "name": "E. Bianco"
    },
    {
      "name": "A. Bortone"
    },
    {
      "name": "I. Boyko"
    },
    {
      "name": "R. A. Briere"
    },
    {
      "name": "A. Brueggemann"
    },
    {
      "name": "D. Cabiati"
    },
    {
      "name": "H. Cai"
    },
    {
      "name": "M. H. Cai"
    },
    {
      "name": "X. Cai"
    },
    {
      "name": "A. Calcaterra"
    },
    {
      "name": "G. F. Cao"
    },
    {
      "name": "N. Cao"
    },
    {
      "name": "S. A. Cetin"
    },
    {
      "name": "X. Y. Chai"
    },
    {
      "name": "J. F. Chang"
    },
    {
      "name": "T. T. Chang"
    },
    {
      "name": "G. R. Che"
    },
    {
      "name": "Y. Z. Che"
    },
    {
      "name": "C. H. Chen"
    },
    {
      "name": "Chao Chen"
    },
    {
      "name": "G. Chen"
    },
    {
      "name": "H. S. Chen"
    },
    {
      "name": "H. Y. Chen"
    },
    {
      "name": "M. L. Chen"
    },
    {
      "name": "S. J. Chen"
    },
    {
      "name": "S. M. Chen"
    },
    {
      "name": "T. Chen"
    },
    {
      "name": "W. Chen"
    },
    {
      "name": "X. R. Chen"
    },
    {
      "name": "X. T. Chen"
    },
    {
      "name": "X. Y. Chen"
    },
    {
      "name": "Y. B. Chen"
    },
    {
      "name": "Y. Q. Chen"
    },
    {
      "name": "Z. K. Chen"
    },
    {
      "name": "J. Cheng"
    },
    {
      "name": "L. N. Cheng"
    },
    {
      "name": "S. K. Choi"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/dq1ece6atk1ch.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.15655",
  "fulltext_url": null,
  "id": "dq1ece6atk1ch",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.15655",
  "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"
    ],
    [
      "openalex",
      "3106|Particle physics theoretical and experimental studies"
    ]
  ],
  "openalex": "W7213333615",
  "pdf_url": "https://arxiv.org/pdf/2609.15655",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-14",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/dq1ece6atk1ch.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:21:25Z",
      "native_id": "2609.15655",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.15655"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ex",
      "subfield": "high-energy"
    }
  ],
  "title": "First Observation and Dynamical Study of the $D^+_s\\to f_{0}(980) μ^+ν_μ$ Decay",
  "title_text": "First Observation and Dynamical Study of the D^+_s→ f_0(980) μ^+ν_μ Decay",
  "type": "preprint",
  "updated_at": "2026-10-30T12:21:25Z",
  "url": "https://research.draconitic.com/paper/dq1ece6atk1ch",
  "venue": "arXiv",
  "versions": []
}