{
  "abstract": "We present an analysis of lepton polarization observables in the rare flavor-changing neutral current decays $Λ_b \\to Λ\\ell^+\\ell^-$ and $Λ_b \\to Λ^*\\ell^+\\ell^-$. These decays are driven by the quark-level transition $b \\to s\\ell^+\\ell^-$ and are sensitive to short-distance physics within and beyond the Standard Model. We work within an effective Hamiltonian framework and derive single lepton polarization asymmetries, double lepton polarization asymmetries, and polarized forward-backward asymmetries using the helicity method. The observables are expressed in terms of transversity amplitudes and evaluated using state-of-the-art lattice QCD form factors. We analyze the $q^2$ dependence of several observables for both the ground-state $Λ$ and the excited $Λ^*(1520)$ final states and discuss sensitivities of the observables to chiral structure of the effective operators and complex Wilson coefficients.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.27015",
  "author_total": 4,
  "authors": [
    {
      "name": "Diganta Das"
    },
    {
      "name": "Vedant Parekh"
    },
    {
      "name": "Ria Sain"
    },
    {
      "name": "Dargi Shameer"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/2zx44kxxtzpy3.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.27015",
  "fulltext_url": null,
  "id": "2zx44kxxtzpy3",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.27015",
  "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-ph"
    ],
    [
      "openalex",
      "3106|Particle physics theoretical and experimental studies"
    ]
  ],
  "openalex": "W7223086090",
  "pdf_url": "https://arxiv.org/pdf/2610.27015",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-19",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/2zx44kxxtzpy3.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:34:04Z",
      "native_id": "2610.27015",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.27015"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ph",
      "subfield": "high-energy"
    }
  ],
  "title": "$Λ_b \\to Λ\\ell^+\\ell^-$ and $Λ_b \\to Λ^{\\ast} \\ell^+\\ell^-$ decays with polarized leptons",
  "title_text": "Λ_b → Λℓ^+ℓ^- and Λ_b → Λ^∗ ℓ^+ℓ^- decays with polarized leptons",
  "type": "preprint",
  "updated_at": "2026-10-30T12:34:04Z",
  "url": "https://research.draconitic.com/paper/2zx44kxxtzpy3",
  "venue": "arXiv",
  "versions": []
}