{
  "abstract": "A measurement of the $ψ(2S)$-to-$J/ψ$ production cross-section ratio is performed in proton-argon ($p\\mathrm{Ar}$) and proton-proton ($pp$) collisions in fixed-target mode at $\\sqrt{s_{\\mathrm{NN}}}=113\\,\\mathrm{GeV}$. Data samples were collected by the LHCb experiment during argon and hydrogen gas injections in the SMOG2 storage cell, resulting in $p\\mathrm{Ar}$ and $pp$ collisions, respectively. The $ψ(2S)$-to-$J/ψ$ production cross-section ratio is measured as a function of the charmonium transverse momentum, $p_{\\mathrm{T}}$, and rapidity in the centre-of-mass system, $y^{*}$. The $ψ(2S)$-to-$J/ψ$ ratio in $p\\mathrm{Ar}$ collisions over that in $pp$ collisions is measured to be $0.90 \\pm 0.04 \\pm 0.02$ for $-2.3<y^{*}<0.0$ and $0<p_{\\mathrm{T}}<8\\mathrm{GeV}/c$, indicating the emergence of nuclear effects in the $p\\mathrm{Ar}$ system. This study acts as a baseline for the interpretation of future measurements with larger systems accessible by the LHCb experiment.",
  "abstract_shown": true,
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  "article_type": null,
  "arxiv": "2608.30534",
  "author_total": 1191,
  "authors": [
    {
      "name": "Roel Aaij"
    },
    {
      "name": "Mohammed Abdelfatah"
    },
    {
      "name": "Ahmed Sameh Wagih Abdelmotteleb"
    },
    {
      "name": "Carlos Abellan Beteta"
    },
    {
      "name": "Fernando Jesus Abudinén"
    },
    {
      "name": "Thomas Ackernley"
    },
    {
      "name": "Ayomide Matthew Adefisoye"
    },
    {
      "name": "Bernardo Adeva"
    },
    {
      "name": "Marco Adinolfi"
    },
    {
      "name": "Patrik Harri Adlarson"
    },
    {
      "name": "Christina Agapopoulou"
    },
    {
      "name": "Christine Angela Aidala"
    },
    {
      "name": "Simon Akar"
    },
    {
      "name": "Kazuyoshi Akiba"
    },
    {
      "name": "Hussain Hassan A Al Saleh"
    },
    {
      "name": "Pietro Albicocco"
    },
    {
      "name": "Johannes Albrecht"
    },
    {
      "name": "Ramunas Aleksiejunas"
    },
    {
      "name": "Federico Alessio"
    },
    {
      "name": "Paula Alvarez Cartelle"
    },
    {
      "name": "Sandra Amato"
    },
    {
      "name": "Jake Lewis Amey"
    },
    {
      "name": "Yasmine Amhis"
    },
    {
      "name": "Zachariah Benjamin Amos"
    },
    {
      "name": "Liupan An"
    },
    {
      "name": "Lucio Anderlini"
    },
    {
      "name": "Pasquale Andreola"
    },
    {
      "name": "Mirco Andreotti"
    },
    {
      "name": "Sergio Andres Estrada"
    },
    {
      "name": "Alessia Anelli"
    },
    {
      "name": "Dong Ao"
    },
    {
      "name": "Carolina Arata"
    },
    {
      "name": "Flavio Archilli"
    },
    {
      "name": "Zaratsyan Areg"
    },
    {
      "name": "Matteo Argenton"
    },
    {
      "name": "Sergio Arguedas Cuendis"
    },
    {
      "name": "Lisa Arnone"
    },
    {
      "name": "Marina Artuso"
    },
    {
      "name": "Elie Aslanides"
    },
    {
      "name": "Rita Ataíde da Silva"
    },
    {
      "name": "Michele Atzeni"
    },
    {
      "name": "Benjamin Audurier"
    },
    {
      "name": "Juliette Authier"
    },
    {
      "name": "David Bacher"
    },
    {
      "name": "Irene Bachiller Perea"
    },
    {
      "name": "Sebastian Bachmann"
    },
    {
      "name": "Marie Bachmayer"
    },
    {
      "name": "John Back"
    },
    {
      "name": "Maoze Bai"
    },
    {
      "name": "Ziyu Bai"
    },
    {
      "name": "Vladislav Balagura"
    },
    {
      "name": "Anna Balboni"
    },
    {
      "name": "Wander Baldini"
    },
    {
      "name": "Zachary Baldwin"
    },
    {
      "name": "Luca Balzani"
    },
    {
      "name": "Haoran Bao"
    },
    {
      "name": "Juan Baptista de Souza Leite"
    },
    {
      "name": "Carlos Javier Barbero Pretel"
    },
    {
      "name": "Matteo Barbetti"
    },
    {
      "name": "Ivanildo Rui Barbosa"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/dw0rh71bh0dpq.bib",
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  "doi": "10.48550/arxiv.2608.30534",
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  "language": "en",
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  "openalex": "W7204915802",
  "pdf_url": "https://arxiv.org/pdf/2608.30534",
  "pmcid": null,
  "pmid": null,
  "published": "2026-08-31",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/dw0rh71bh0dpq.ris",
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      "first_seen": "2026-10-30T12:17:37Z",
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  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ex",
      "subfield": "high-energy"
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    {
      "field": "physics",
      "origin": "arxiv:nucl-ex",
      "subfield": "nuclear"
    }
  ],
  "title": "First measurement of the ratio of $ψ(2S)$-to-$J/ψ$ inclusive production in $p\\mathrm{Ar}$ and $pp$ collisions at $\\sqrt{s_{\\mathrm{NN}}} =113\\,\\mathrm{GeV}$ with SMOG2",
  "title_text": "First measurement of the ratio of ψ(2S)-to-J/ψ inclusive production in pAr and pp collisions at √(s_NN) =113 GeV with SMOG2",
  "type": "preprint",
  "updated_at": "2026-10-30T12:17:41Z",
  "url": "https://research.draconitic.com/paper/dw0rh71bh0dpq",
  "venue": "HAL",
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