{
  "abstract": "We analyze $B^- \\to μ^- \\barν_μ$, $\\bar{B}^0 \\to π^+ μ^-\\barν_μ$, and $B^- \\to ρ^0 μ^- \\barν_μ$ decays using the data on binned branching fractions recently measured by Belle II Collaboration for the semileptonic modes. We extend the low-energy Hamiltonian governing $b \\to u \\ell \\barν_\\ell$ transitions to include the full set of dimension-six, Lorentz-invariant operators with left-handed neutrinos, consistent with the Standard Model Effective Field Theory (SMEFT) framework. The Wilson coefficients are treated as complex, lepton-flavor-dependent effective couplings. Since the three selected channels are sensitive to different non-standard structures, we perform a combined analysis using Monte Carlo methods to constrain the New Physics couplings for three benchmark values of $|V_{ub}|$. We find that, while the Standard Model remains broadly compatible with the data, some of the couplings show a mild preference for non-zero values.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.29707",
  "author_total": 2,
  "authors": [
    {
      "name": "Maria Letizia Di Cuia"
    },
    {
      "name": "Davide Milillo"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/3k0fmsfjgmv47.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.29707",
  "fulltext_url": null,
  "id": "3k0fmsfjgmv47",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.29707",
  "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|Particle physics theoretical and experimental studies"
    ]
  ],
  "openalex": "W7223219235",
  "pdf_url": "https://arxiv.org/pdf/2610.29707",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-23",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/3k0fmsfjgmv47.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:35:15Z",
      "native_id": "2610.29707",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.29707"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ex",
      "subfield": "high-energy"
    }
  ],
  "title": "Probing New Physics with $b \\to u \\ell ν_{\\ell}$ induced decays",
  "title_text": "Probing New Physics with b → u ℓ ν_ℓ induced decays",
  "type": "preprint",
  "updated_at": "2026-10-30T12:35:15Z",
  "url": "https://research.draconitic.com/paper/3k0fmsfjgmv47",
  "venue": "arXiv",
  "versions": []
}