{
  "abstract": "Recently, we have shown that the hypothesis of the dark-matter (DM) origin of the Belle II excess events in $B\\to K M_X$ decays allows for a successful description of the data. The DM parameters (masses and couplings) in two DM scenarios with either scalar (S-scenario) or vector (V-scenario) mediator have been extracted with rather small uncertainty from fits to the $B\\to K M_X$ data. The same mechanism leads to a similar enhancement of the $B_s\\to (η,η',ϕ) M_X$ decay rates. We present a detailed analysis of $B\\to K^* M_X$ and $B_s\\to ϕM_X$ decays and show that these decays provide a clear probe of the S- and V-scenarios: Compared to the Standard Model, in the S-scenario an enhancement by a factor $\\sim 1.6$ is expected, whereas the V-scenario leads to a much larger enhancement by a factor $\\sim 3.5$. For the $B\\to K^* M_X$ decays, we provide the expected number of events at Belle II for the sample for which a rather large enhancement of $B\\to K M_X$ decays compared to the Standard Model expectations has been reported.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.13069",
  "author_total": 3,
  "authors": [
    {
      "name": "Alexander Berezhnoy"
    },
    {
      "name": "Wolfgang Lucha"
    },
    {
      "name": "Dmitri Melikhov"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/bd1456kptt4sk.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.13069",
  "fulltext_url": null,
  "id": "bd1456kptt4sk",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.13069",
  "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": "W7212652481",
  "pdf_url": "https://arxiv.org/pdf/2609.13069",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-11",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/bd1456kptt4sk.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:21:07Z",
      "native_id": "2609.13069",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.13069"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ph",
      "subfield": "high-energy"
    }
  ],
  "title": "$B_{(s)}\\to V M_X$ decays as probes of dark-matter scenarios of Belle II enhancement in $B\\to KM_X$ decays",
  "title_text": "B_(s)→ V M_X decays as probes of dark-matter scenarios of Belle II enhancement in B→ KM_X decays",
  "type": "preprint",
  "updated_at": "2026-10-30T12:21:07Z",
  "url": "https://research.draconitic.com/paper/bd1456kptt4sk",
  "venue": "arXiv",
  "versions": []
}