{
  "abstract": "Di-muon events emanating from a replica of the SHiP target at the CERN SPS (with a 400 GeV/c proton beam) contain a clear signal of $${J \\hspace{-1.66656pt}/\\hspace{-1.111pt}\\psi \\hspace{1.111pt}}$$ J / ψ production. The target consisted of 13 interaction lengths of molybdenum and tungsten, followed by a 2.4m iron hadron absorber. The di-muon rate is in reasonable agreement with Monte Carlo simulation based on Pythia v8. However, the $${J \\hspace{-1.66656pt}/\\hspace{-1.111pt}\\psi \\hspace{1.111pt}} $$ J / ψ rate observed in the data is much lower than predicted by the Monte Carlo simulation, which is advantageous for SHiP since muons with a large $$p_\\textrm{T} $$ p T are more difficult to deflect by the active muon shield.\n\nFor the center of mass rapidity ( $$y_{\\textrm{cm}} $$ y cm ) interval with the largest overlap with the NA50 measurement, $$0.3< y_{\\textrm{cm}} < 0.6$$ 0.3 < y cm < 0.6 , we obtain the production cross-section per nucleon $$\\sigma ({J \\hspace{-1.66656pt}/\\hspace{-1.111pt}\\psi \\hspace{1.111pt}})/A$$ σ ( J / ψ ) / A including the branching ratios of $${J \\hspace{-1.66656pt}/\\hspace{-1.111pt}\\psi \\hspace{1.111pt}} $$ J / ψ decays into muons, $$B_{\\mu ^+\\mu ^-}$$ B μ + μ - :\n\n$$B_{\\mu ^+\\mu ^-}\\sigma ({J \\hspace{-1.66656pt}/\\hspace{-1.111pt}\\psi \\hspace{1.111pt}})/A=(1.18~\\pm ~0.04~\\pm ~0.10)~\\textrm{nb}$$ B μ + μ - σ ( J / ψ ) / A = ( 1.18 ± 0.04 ± 0.10 ) nb /nucleon.\n\nThis is to be compared to the NA50 extrapolated result (using a much thinner target):\n\n$$B_{\\mu ^+\\mu ^-}\\sigma ({J \\hspace{-1.66656pt}/\\hspace{-1.111pt}\\psi \\hspace{1.111pt}})/A=(0.99~\\pm ~0.04)~\\textrm{nb}$$ B μ + μ - σ ( J / ψ ) / A = ( 0.99 ± 0.04 ) nb /nucleon. Within the systematic errors, no significant enhancement due to secondary production of $${J \\hspace{-1.66656pt}/\\hspace{-1.111pt}\\psi \\hspace{1.111pt}}$$ J / ψ inside the target is observed. An upper limit at 90% confidence level of possible contributions from secondary collisions of $$<32\\%$$ < 32 % is obtained.",
  "abstract_shown": true,
  "affiliations": [
    "Integrated Computing Architectures (ICA | PGI-4),Forschungszentrum Jülich GmbH (KFA)",
    "Sezione INFN di Napoli",
    "Università di Napoli ‘Federico II‘",
    "Humboldt-Universität zu Berlin",
    "European Organization for Nuclear Research (CERN)",
    "Karlsruhe Institute of Technology",
    "Joint Institute for Nuclear Research",
    "Ecole Polytechnique Fédérale de Lausanne (EPFL)",
    "Nagoya University",
    "Universität Zürich",
    "Taras Shevchenko National University of Kyiv",
    "Universität Hamburg",
    "Imperial College London",
    "Laboratory of Instrumentation and Experimental Particle Physics(LIP)",
    "Sofia University",
    "University of Leiden",
    "Sezione INFN di Cagliari",
    "Università di Cagliari",
    "Constructor University",
    "University of Liverpool",
    "Université Paris-Saclay",
    "Universität Freiburg",
    "Johannes Gutenberg Universität Mainz",
    "University College London",
    "Sezione INFN di Bologna",
    "Suwon-si",
    "Georgian Technical University",
    "Ghent University",
    "Universität Siegen",
    "Sezione INFN di Bari",
    "Università degli Studi del Sannio di Benevento",
    "Università di Napoli Parthenope",
    "Università di Bari",
    "Millenium Institute For Subatomic Physics At High-Energy Frontier - SAPHIR"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 224,
  "authors": [
    {
      "name": "The SHiP Collaboration"
    },
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      "name": "A. Aksoy",
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  "bibtex": "https://research.draconitic.com/paper/c3nkjqfhx5jwf.bib",
  "cited_by": 0,
  "doi": "10.1140/epjc/s10052-026-16148-3",
  "fulltext_url": null,
  "id": "c3nkjqfhx5jwf",
  "issns": [
    "1434-6044",
    "1434-6052"
  ],
  "landing_url": "https://link.springer.com/article/10.1140/epjc/s10052-026-16148-3",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by/4.0",
  "metadata_licence": null,
  "native_subjects": [
    [
      "openalex",
      "3106|Particle physics theoretical and experimental studies"
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  "openalex": "W7153690964",
  "pdf_url": "https://link.springer.com/content/pdf/10.1140/epjc/s10052-026-16148-3.pdf",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-26",
  "publisher": "Springer Science and Business Media LLC",
  "ris": "https://research.draconitic.com/paper/c3nkjqfhx5jwf.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:18:04Z",
      "native_id": "10.1140/epjc/s10052-026-16148-3",
      "source": "crossref",
      "url": "https://link.springer.com/article/10.1140/epjc/s10052-026-16148-3"
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  "subjects": [
    {
      "field": "physics",
      "origin": "openalex:3106|Particle physics theoretical and experimental studies",
      "subfield": "high-energy"
    }
  ],
  "title": "Measurement of di-muons from 400 GeV/c protons interacting in a thick molybdenum/tungsten target",
  "title_text": "Measurement of di-muons from 400 GeV/c protons interacting in a thick molybdenum/tungsten target",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:18:04Z",
  "url": "https://research.draconitic.com/paper/c3nkjqfhx5jwf",
  "venue": "The European Physical Journal C",
  "versions": []
}