{
  "abstract": "The heavy-quark polarization in ultra-relativistic heavy-ion collisions (HICs) serves as a probe for unfolding the characteristics of deconfined QCD. The present study explores the spin alignment of $\\mathrm{J/ψ}$ in the HICs by employing the rotational Brownian motion of charm quarks in the presence of a strong magnetic field. We derive an analytical expression for the polarization of the $c$-$\\bar{c}$ pair based on the Fokker-Planck equation under the consideration of spin-vorticity coupling. These polarized $c$-$\\bar{c}$ pairs lead to the formation of the $\\mathrm{J}/ψ$ at the hadronization surface via the coalescence and fragmentation mechanisms. Correspondingly, we obtain the $m=0$ diagonal element $ρ_{00}$ of the $\\mathrm{J}/ψ$ spin-density matrix, which quantifies its spin alignment along the chosen quantization axis. Our study provides a microscopic description of heavy-quark spin transport and suggests rotational diffusion as a possible mechanism underlying the observed $\\mathrm{J}/ψ$ spin alignment.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.17486",
  "author_total": 2,
  "authors": [
    {
      "name": "Bhagyarathi Sahoo"
    },
    {
      "name": "Captain R. Singh"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/72d5m2k9ht061.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.17486",
  "fulltext_url": null,
  "id": "72d5m2k9ht061",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.17486",
  "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"
    ],
    [
      "arxiv",
      "nucl-th"
    ],
    [
      "openalex",
      "3106|High-Energy Particle Collisions Research"
    ]
  ],
  "openalex": "W7213430561",
  "pdf_url": "https://arxiv.org/pdf/2609.17486",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-15",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/72d5m2k9ht061.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:21:41Z",
      "native_id": "2609.17486",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.17486"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ph",
      "subfield": "high-energy"
    },
    {
      "field": "physics",
      "origin": "arxiv:nucl-th",
      "subfield": "nuclear"
    }
  ],
  "title": "Rotational Brownian Motion and $\\mathrm{J/ψ}$ Spin Alignment in Heavy-Ion Collisions",
  "title_text": "Rotational Brownian Motion and J/ψ Spin Alignment in Heavy-Ion Collisions",
  "type": "preprint",
  "updated_at": "2026-10-30T12:21:41Z",
  "url": "https://research.draconitic.com/paper/72d5m2k9ht061",
  "venue": "arXiv",
  "versions": []
}