{
  "abstract": "This thesis investigates B-meson lifetimes as probes of Standard Model (SM) dynamics and physics beyond the SM (BSM), employing the Heavy Quark Expansion (HQE) and light-cone sum rules (LCSR). Within the HQE, we calculate at leading order in QCD the complete dimension-seven two-quark contributions to the CKM-favoured non-leptonic transitions $b\\to c\\bar{u}d$ and $b\\to c\\bar{c}s$, providing analytical Wilson coefficients for the $1/m_b^4$ corrections. We then extend the dimension-six Darwin contribution to a model-independent BSM framework, deriving the Wilson coefficients through order $1/m_b^3$ for a general non-leptonic effective Hamiltonian. We also determine the corresponding dimension-six four-quark weak annihilation contributions. As a special case, our results provide previously missing dimension-five and dimension-six contributions induced by SM QCD-penguin operators. Finally, we investigate B-mesogenesis, which connects the cosmic matter-antimatter asymmetry and dark matter to exotic B-meson decays. We study inclusive decay rates and lifetime ratios within the HQE and exclusive $B^+\\to pψ$ decays using LCSR. Comparisons with experimental constraints from BaBar, Belle and Belle II restrict the allowed parameter space. We also identify kinematic regions where power-suppressed contributions exceed the leading terms, highlighting limitations of the HQE. Together, these studies advance the theoretical understanding of heavy-hadron lifetimes, strengthen the bridge between precision flavour physics and physics beyond the SM, and open new avenues for probing the interplay between heavy-quark dynamics and the dark sector.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.25311",
  "author_total": 1,
  "authors": [
    {
      "name": "Ali Mohamed"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/7yjn50s3fhwnc.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.25311",
  "fulltext_url": null,
  "id": "7yjn50s3fhwnc",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.25311",
  "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-ph"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2610.25311",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-18",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/7yjn50s3fhwnc.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:30:52Z",
      "native_id": "2610.25311",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.25311"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ph",
      "subfield": "high-energy"
    }
  ],
  "title": "More than a Lifetime: Towards Precision Predictions for $B$-Meson Decays in the Standard Model and Beyond",
  "title_text": "More than a Lifetime: Towards Precision Predictions for B-Meson Decays in the Standard Model and Beyond",
  "type": "preprint",
  "updated_at": "2026-10-30T12:33:41Z",
  "url": "https://research.draconitic.com/paper/7yjn50s3fhwnc",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.25819/ubsi/11095",
      "pid": null,
      "relation": "published-as",
      "title": null,
      "venue": null
    }
  ]
}