{
  "abstract": "The hypothesis of top-philic dark matter as the origin of the Belle II excess events in $B\\to K M_X$ decays has direct impact on $K\\to πM_X$ decays: Both of these decays proceed via loop diagrams~with a top quark emitting some mediator field $R$ and the subsequent decay of $R$ into a pair of dark-matter fermions $\\barχχ$. The Belle II results on $B\\to K M_X$ allowed us to extract the parameters of the mediator $R$ with reasonable accuracy, whereas the sensitivity to the fermion mass $m_χ$ proved to be rather low. In contrast to $B\\to K M_X$ decays, the $K\\to πM_X$ decays exhibit a strong sensitivity to $m_χ$; therefore, if - upon reducing theoretical and experimental uncertainties - the tension between standard-model predictions for the $K\\toπM_X$ decays and the most recent NA62 measurements becomes pronounced the latter decays may either enable the extraction of the value of $m_χ$ or provide a lower limit on~$m_χ$.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.24701",
  "author_total": 3,
  "authors": [
    {
      "name": "Alexander Berezhnoy"
    },
    {
      "name": "Wolfgang Lucha"
    },
    {
      "name": "Dmitri Melikhov"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/b3rxte0gytx14.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.24701",
  "fulltext_url": null,
  "id": "b3rxte0gytx14",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.24701",
  "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",
      "3106|Particle physics theoretical and experimental studies"
    ]
  ],
  "openalex": "W7223002077",
  "pdf_url": "https://arxiv.org/pdf/2610.24701",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-17",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/b3rxte0gytx14.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:30:52Z",
      "native_id": "2610.24701",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.24701"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ph",
      "subfield": "high-energy"
    }
  ],
  "title": "Probing dark-matter scenarios of Belle II excess in $B^+\\to K^+M_X$ with $K^+\\to π^+ M_X$ decays",
  "title_text": "Probing dark-matter scenarios of Belle II excess in B^+→ K^+M_X with K^+→ π^+ M_X decays",
  "type": "preprint",
  "updated_at": "2026-10-30T12:33:41Z",
  "url": "https://research.draconitic.com/paper/b3rxte0gytx14",
  "venue": "arXiv",
  "versions": []
}